At that time, contract negotiations had been pursued with Norwegian Contractors on building a four-shaft Condeep gravity base structure (GBS). They were at the point where a letter of intent was ready.
The recently established Norwegian Petroleum Consultants (NPC) joint venture had also signed a contract on project management and engineering design for Statfjord B. Read more about NPC in the section on Statfjord B – the first plan.
While the contract for building the platform topside and mechanical outfitting of the GBS shafts had yet to be awarded, an option agreement had been secured with the Aker group.
So all the main contracts for the project appeared to have been put in place. The Storting (parliament) had also approved phase II of the development plan in June 1976, and most people assumed that it was simply a case of starting to build.
Until the NPD letter arrived
The Vogt commission
New safety regulations for the Norwegian offshore industry had been adopted on 9 July that year. A key issue for Statfjord B and the field licensees was the introduction of a more restrictive attitude towards simultaneous drilling and production combined with living quarters on a single integrated platform.
The new rules had been developed by a commission of inquiry appointed by the government as early as 22 May 1970 with a mandate to propose regulations for the safety of production and storage facilities on the seabed and of exploiting petroleum deposits.[REMOVE]Fotnote: Norsk Oljerevy. (1976). no 2. Kontroll med sikkerheten fordelt på ni instanser.
Work in the commission progressed slowly and its chair, Jens Evensen, asked to be relieved. He was replaced in November 1972 by director general Lars Oftedal Broch, who was replaced in his turn during May 1974 by Nils Vogt from the NPD.
The latter gave his name to the commission’s report, which was submitted to the Ministry of Industry on 12 July 1975. It was then circulated for consultation to affected companies and institutions.[REMOVE]Fotnote: Hanisch, T., Nerheim, G., & Norsk petroleumsforening. (1992). Fra vantro til overmot? (Vol. 1). Oslo: Leseselskapet: 324.
Adopted by royal decree of 9 July 1976, the new safety regulations were based on the recommendations of the Vogt commission and on comments received in the consultation process. One provision of the decree was that the NPD would bear primary responsibility for supervising fixed offshore installations.
Safety issues on Statfjord were viewed by the directorate through the prism of the new regulations. It kept the industry ministry informed about its work, and wrote the following in a letter dated 7 July 1976:
“Given the work being done on safety conditions, it has been found necessary to adopt a more restrictive attitude to those concepts which are based on combined drilling and production, where the living quarters are also placed on the same platform. The main intentions of the Vogt commission’s recommendations run counter to both combined activity and the above-mentioned placement of living quarters … The NPD would emphasise that combined drilling and production will only be accepted following individual analyses and assessments. The same applies to living quarters which it is proposed to place on a drilling/production platform. No final choice of concept has been made for Statfjord B, so no specific safety analysis has been submitted. Comments from the NPD will accordingly have to wait until it the actual conditions have been presented.”[REMOVE]Fotnote: Norsk Oljerevy.
In other words, the ministry had been informed of the NPD’s work and of its scepticism about the plans for Statfjord B. As the letter indicated, the regulator could not adopt a final position until the Statfjord Unit Operating Committee (SUOC) had approved the concept chosen for the B platform in late August 1976. Only then could the NPD conduct its own safety analysis.
The results of the latter were presented to the Statfjord licensees in the above-mentioned letter of 11 November 1976, where the NPD questioned the safety of an integrated platform and ordered the construction of a separate quarters platform:
“The NPD is currently assessing the concept for Statfjord B on the basis of a general evaluation of the safety rules on the field in the light of the new regulations (royal decree of 9.7.76)
“Statfjord B is expected to involve:
- particularly complex and extensive production facilities concentrated on a single platform
- a large number of producing wells with high capacity, along with water and gas injection
- permanent living quarters for 200 occupants, which will be used by 400 people during the construction phase and possibly the drilling phase
- possible simultaneous drilling and production.
“The total risk is characterised by the contributions from each of the activities and processes which include the examples given above. The NPD’s assessment is that the total risk associated with these conditions lies at too high a level.
“In the NPD’s view, the best way to reduce the total risk would be to reduce the number of people who are present on the platform at any given time. The NPD has accordingly concluded that a separate quarters platform connected to Statfjord B should be built.”
This safety assessment was not confined to Statfjord B. Questions were also posed about the A platform, construction of which was far advanced at the time. It was due to be towed out to the field in six months.
“The considerations mentioned above also apply to Statfjord A, if to a somewhat lesser degree. The NPD would accordingly, on the basis of the provisions in the royal decree of 9.7.76, request that the company undertakes a new overall assessment of safety conditions [on this installation] in relation to the planned drilling and production programme, with particular attention paid to the accommodation issue.”
This letter was signed by Gunnar Hellesen, chair of the NPD board, and director general Fredrik Hagemann.
New concepts proposed
Statfjord B was intended to be a virtual copy of the A platform, but with four support shafts instead of three. The process facilities would be equally large and complex, with a production capacity of 300 000 barrels per day, and the 200-berth quarters module was to be installed on the platform.
It was the last feature in particular that the NPD wished to prevent. The regulator took the view that cutting the number of people on the platform at any given time would reduce the overall risk.
As the letter indicates, the desirable solution was seen to be the construction of two platforms – one for production and drilling, and the other for accommodation. The NPD also emphasised the need for overall safety thinking, and wanted a separate safety study carried out before detailed planning began.
Statoil and Mobil expressed surprise at the letter, and claimed they had not heard that such assessments were being made. Arve Johnsen, then Statoil’s chief executive, described his reaction to the letter in his book Utfordringen (The Challenge): “As chief executive of Statoil, I received many kinds of letters … I have forgotten most of them, but I will remember one to my dying day … It sent a shock wave through the licensees in the Statfjord group.”[REMOVE]Fotnote: Johnsen, A. (1988). Utfordringen : Statoil-år. Oslo: Gyldendal: 202.
It might seem incomprehensible that the partners had failed to see this coming. They had long been aware that the NPD was looking at problems associated with simultaneous drilling and production, and the Vogt commission’s report had been through a consultation process. Comments in the latter as well as the report itself formed the basis for the new safety regulations.
Adopted in June, four months before the letter was despatched, the regulations specified that simultaneous drilling and production was prohibited without special permission. This should have sent certain signals that the plans for Statfjord B might be more difficult to implement than Mobil and Statoil thought.
As late as 12 October, section head Harald Ynnesdal had explained the NPD’s view on the issue in a speech he gave in Kristiansand:
“The new platform types are particularly complex and difficult to assess from a safety perspective with regard to these combined activities. As far as possible, fields should be planned with separate quarters platforms. The production platforms could then, with their combined activities, be assessed purely as industrial plants.
“In an assessment of simultaneous drilling and production in the Statfjord project, for example, the problem would have been much simpler if separate quarters platforms had been adopted. The cost of such platforms would have had little effect on profitability for this project, but would have meant a great deal for overall safety and the desire for an early start to production.”[REMOVE]Fotnote: Norsk Oljerevy. (1976). no 9. Statfjord – planer og virkelighet. On the basis of this letter, an extraordinary meeting of the SUOC was called on 26 November. It decided that all activities related to Statfjord B would be halted. The project would have to be re-evaluated, and extensive conceptual studies were to be carried out for every option from one to three platforms.
A meeting of the Statfjord field engineering committee (SFEC) – the technical project team – took place in January 1977. A 35-strong sub-committee was appointed to study and assess various conceptual solutions for Statfjord B, and came up with 39 variants for consideration.
When the SUOC met again on 18 March, Statoil expressed concern at the progress made. The project had a tight timetable, and order books at the Norwegian shipyards were empty. To speed up the process, the company proposed a separate drilling platform linked by a bridge to a combined production and quarters unit.
A drilling platform supported on a steel jacket, for instance, would be relatively cheap to build and could be ready for tow-out as early as 1979. Drilling of production wells could start as soon as the platform was in place, and continue while the associated production and quarters facility was under construction.
As soon as the latter had been installed, oil and gas could thereby begin.[REMOVE]Fotnote: Norsk Oljerevy. (1977). no 5. Industrien må fortsatt vente på Statfjord B. This meant in turn that the original schedule set in the field development plan could be met.
Mobil and Saga were strongly opposed to this plan, but did not have enough votes to block it. Their interests added up to only 25 per cent, while resolutions in the SUOC needed 70 per cent support. The Statoil proposal was thereby adopted – against the operator’s vote.
Esso also proposed its own solution at the meeting, comprising an integrated production, drilling and quarters (PDQ) platform but with processing capacity halved to 150 000 barrels per day. This facility would be simpler, since only one process train was required rather than the original two, and overall safety would be improved.
Mobil supported the Esso proposal. The two companies were uncompromising in their opposition to two platforms, and maintained that this would provide no safety benefit. A factor in their assessment was the poor seabed soil conditions on Statfjord, which meant that installing two platforms so close to each other and linked by a bridge carrying high-pressure pipelines would pose a safety risk.
The thought of the substantial capital investment required for two platforms also worried the operator. On the other hand, experience from other North Sea projects suggested that a capacity of 150 000 barrels per day would be sufficient. Such a solution would reduce construction costs by simplifying the platform, and production could also start earlier.
A further meeting of the SUOC was held on 28 April, when Mobil proposed an integrated platform with a single process train and an average capacity of 180 000 barrels per producing day. This size had been chosen in the hope of avoiding a separate quarters platform.
The change to the original concept was so large that a completely new field development plan might have to be produced. According to the proposals approved the Storting in the summer of 1976, three platforms with a combined capacity of 900 000 barrels per day were to be installed.
Reducing the size of the process facilities on each platform would either require more structures to maintain the planned output, or a slower pace of production.[REMOVE]Fotnote: Norsk Oljerevy. (1977). no 5. Industrien må fortsatt vente på Statfjord B. Fresh consideration by the Storting could delay the project further.
At the same time, Mobil vetoed a separate quarters platform.[REMOVE]Fotnote: Moe, J. (1980). Kostnadsanalysen norsk kontinentalsokkel : Rapport fra styringsgruppen oppnevnt ved kongelig resolusjon av 16. mars 1979 : Rapporten avgitt til Olje- og energidepartementet 29. april 1980 : 2 : Utbyggingsprosjektene på norsk sokkel (Vol. 2). Oslo: [Olje- og energidepartementet]. With strong support from Esso, the operator noted that it could not accept a solution which complied with the NPD’s principle that drilling and production should not take place simultaneously on the same installation.
Clear instructions had been sent from Mobil’s head office in New York that a compromise solution which would involve an acceptance of the NPD principle was out of the question. It feared that conceding this demand from the Norwegian regulator could lead to similar requirements on other continental shelves, which would have major consequences for both Mobil and its fellow oil companies.
A telex from New York emphasised that, the way things looked, concrete platforms on the scale of Statfjord A had outplayed their role on this field. Mobil was willing to renounce the operatorship for Statfjord B if a two-platform solution was adopted. This attitude took Statoil and the Norwegian government by surprise.[REMOVE]Fotnote: Norsk Oljerevy. (1977). no 5. Industrien må fortsatt vente på Statfjord B.
Statoil explored the possibility of another operator, but none of the other partners was willing to take on the role without a reallocation of licence interests. Mobil and Esso had staked their prestige on the issue, and they finally managed to convince Statoil of the technical problems posed by a two-platform solution. The argument that this could affect later developments in deeper water was central to the Norwegian company’s change of mind.
The discussion on one or more platforms and the studies of various concepts were paralleled with the presentation of new seismic data for the field. These cut its estimated oil reserves from 3.9 billion barrels – equivalent to 527 million tonnes – to 3.2 billion or 432 million tonnes. That reduced the need for two process trains on Statfjord B.
On 5 August, the SUOC approved plans for a platform with the capacity to process 180 000 barrels per day. It was resolved on 29 November to apply to the NPD for permission to build such a structure. The application, accompanied by a separate safety study, was submitted on 1 December.
Plans now called for Statfjord B to be installed in 149 metres of water at the southern end of the field. Seabed conditions were poorer there than over the rest of Statfjord, and the base area of the GBS accordingly had to be increased.
While Statfjord A had 19 cells, the B version would have 24. Planned topside space would expand correspondingly, from 5 200 square metres to 7 800. The platform would still have four shafts even though only one process train was to be installed. With the fourth shaft reserved for risers, space was freed up in the others.
Additional safety barriers were introduced by the decision to make the decks and modules open, reducing the danger of an explosion and possible damage from such an incident. The various functions would also be positioned in such a way that no hazardous operations were close to or beneath the living quarters. And the quarters modules would be protected by an additional fire wall. These plans were approved by the NPD on 19 December.
The project had been delayed by a year and incurred substantial costs through a number of conceptual studies and reports. According to Henrik Ager-Hanssen, deputy chief executive of Statoil, the letter from the NPD was the most expensive in Norwegian history and cost the project NOK 25 million per word.
Viewed from a different perspective, former Statoil staffer Bjørn Vidar Lerøen has noted that oil prices reached record levels over the next few years. That meant the letter became one of Norway’s most profitable.[REMOVE]Fotnote: Lerøen, B., Gooderham, R., & Statoil. (2002). Drops of black gold : Statoil 1972-2002. Stavanger: Statoil: 149.
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The GBS accordingly represented the biggest challenge yet faced by Condeep builder Norwegian Contractors (NC). It surpassed all previous platform projects in both size and complexity.
Standing 174 metres high, the completed structure contained 135 000 cubic metres of concrete and roughly 35 500 tonnes of reinforcement bars (rebars). Its base section was 169 metres long and 143 metres wide, covering an area of just over 1.8 hectares – or three football pitches.
Its 24 cells could store about 1.8 million barrels of oil, and 98 steel and concrete skirts were installed under its base..[REMOVE]
Fotnote: Steen, &., & Norwegian Contractors. (1993). På dypt vann : Norwegian Contractors 1973-1993. Oslo: [Norwegian Contractors]: 44.
By comparison, Statfjord A and all the other previous Condeeps had 19 cells and three shafts. They had a base area of 8 000 square metres, 89 000 cubic metres of concrete and 17 240 tonnes of rebars.
An important part of the GBS’s function was to transport itself and the topside out to the field. And big benefits were obtained by completing as much as possible of the support structure, topside and outfitting in sheltered inshore waters, before towing the platform out and sinking it on the field without any preparation of the seabed.
One design parameter for the GBS was the ability to support a topside tow-out weight of 35 000 tonnes. The corresponding figure for Statfjord A had been 20 000 tonnes. So the Statfjord B GBS had to be substantially increased in size to cope with the extra weight. Its buoyancy needed to be high, with a corresponding large volume of ballast where the moment between buoyancy and ballast was small.[REMOVE]Fotnote: Dahl, Per C. og Olsen, Olav. (1978, 20. oktober). Statfjord B – interessant konstruksjon med mange nye trekk. Norsk Oljerevy Ba 4, nr. 7/8.
As mentioned above, the base area was increased from about 8 000 square metres on the earlier Condeeps to no less than 18 000 square metres in order to ensure sufficient buoyancy. Cell storage was increased from 1.2 million tonnes on Statfjord A.
Another reason for such a big expansion in the base area was that seabed conditions at Statfjord B’s intended location were significantly poorer than for the A platform. Several innovations were developed to alleviate this problem.
First, the GBS was provided with a “cellar” section, an enclosed space under the cells and above the base plate. In addition to helping overcome the bottom conditions, this solution had several advantages.
It provided space for piping systems which had been cast inside the concrete on earlier Condeeps, for instance. Since the cellar was dry until the cells had been cast, pipework could be installed during that period.
The external pipelines – risers – to and from the platform had been installed outside the cell walls on earlier Condeeps, which called for extensive diving work to weld pipes together on the seabed. But the cellar on Statfjord B provided space to conduct the risers through pipes directly to the fourth shaft, where they could be welded in the dry once this “riser” shaft had been emptied of water.[REMOVE]
Fotnote: Dahl, Per C. og Olsen, Olav. (1978, 20. oktober). Statfjord B – interessant konstruksjon med mange nye trekk. Norsk Oljerevy Ba 4, nr. 7/8.
Installed beneath the cellar/base plate, the 98 steel and concrete skirts also had several functions. Plans called for the platform to be installed directly on the unprepared seabed. As in many other areas, the upper layers of the sea bottom were less consolidated than those lower down.
So rigid steel skirts were important, because they would cut down into the soil to reach a depth which could bear the load. They also protected against the seabed being washed out, and served as a framework for concrete grouting beneath the platform.
Pressure in the skirts was also kept below the ambient level. Combining overpressure and underpressure in the spaces between the various skirts, the platform could be manoeuvred more surely during its installation.
Thanks to the skirts, too, the structure could also be safely placed on sloping ground. Maintaining overpressure in the relevant skirts kept the platform level until grouting had been completed.[REMOVE]
Fotnote: Dahl, Per C. og Olsen, Olav. (1978, 20. oktober). Statfjord B – interessant konstruksjon med mange nye trekk. Norsk Oljerevy Ba 4, nr. 7/8.
Yet another innovation on Statfjord B was the increase in the number of shafts from three to four. Experience with Statfjord A and other earlier concrete platforms showed that a four-shaft layout was more appropriate for supporting the topside. Although the Statfjord B GBS was built in the same way as its predecessors at Hinnavågen outside Stavanger, it incorporated so many changes that it ranked as a new Condeep generation.
A dedicated organisation comprising NC’s own personnel was needed to manage and control such a giant project. Both Mobil as the client and NC also hired external expertise, with Mobil awarding a consultancy contract to EMC – a joint venture between Brown & Root and Norway’s NPC.
For its part, NC hired Grøner og Noteby to support the construction management team and to conduct quality control of its own work. It also hired the Olav Olsen A/S consultancy to do construction engineering, prepare drawings and make calculations for the concrete work, the Norwegian Geological Institute (NGI) for foundations and instrumentation, and Det Norske Veritas (DNV) for technical calculations.
The Norwegian Petroleum Directorate (NPD), which was responsible for seeing that work complied with official safety regulations, hired Dr Ing Aas Jacobsen to check drawings, calculations and the execution of concrete and steel construction. This consultancy had done the same job on Statfjord A.
With DNV checking the mechanical systems, drawings were accordingly assessed by three different bodies – Aas Jacobsen for the NPD, DNV for NC and EMC for Mobil. The level of change orders for building the Statfjord B GBS was low.[REMOVE]
Fotnote: Moe, J. (1980). Kostnadsanalysen norsk kontinentalsokkel : Rapport fra styringsgruppen oppnevnt ved kongelig resolusjon av 16. mars 1979 : Rapporten avgitt til Olje- og energidepartementet 29. april 1980 : 2 : Utbyggingsprosjektene på norsk sokkel (Vol. 2). Oslo: [Olje- og energidepartementet]: 231.
NC began the job of readying the construction site before Mobil had awarded it the contract to build the Statfjord B GBS. The first step was to move a pipeline used to pump out seawater which seeped under the sheet pile retaining wall. This extended too far into the dock.
A larger foundation was also required. It had previously covered some 0.8 hectares, but the planned dimensions of Statfjord B meant this had to be expanded to two hectares. After an investigation, it was decided that the existing foundation could be incorporated in the new one.[REMOVE]Fotnote: Stavanger Aftenblad. (1978, 24. januar). Klar for B-plattformen.
Once the contract had been formally signed, work on improving the ground began before the new foundation was cast. The dock had to be drained and part of the spoil had to be removed. A good base for the concrete foundation was important – it had to cope with a weight of 110 000 tonnes which was unevenly distributed.
The bottom section of the GBS was towed out of the dry dock on 11 June 1979 and moored in the Gands Fjord off Stavanger while preparations were made to slipform the cells. This tow-out was a critical phase. The section had to be pulled out of the inner dock for 100 metres, before being turned 23 degrees and then towed out of the opening.
Very little wind could be tolerated, and the job had to be postponed twice. The first attempt was aborted after it transpired that bottom conditions at the dock gate had not been properly prepared, so that the draft was too shallow. A 70 000-cubic-metre support bank had to be removed. Excessive wind prevented the second try.
But everything went according to plan the third time, and the bottom section was pulled out of the dock by winches with just 70 centimetres of clearance over the bottom.[REMOVE]Fotnote: Stavanger Aftenblad. (1979, 28. juni).
Once the structure was clear of the dock, the winch cables were severed and the tugs took over. Compressed air, buoyancy and 20 000 horsepower divided between five tugs made it possible to move Statfjord B to the mooring site at a speed of two-three knots.
Attaching and tightening the moorings took two days.[REMOVE]Fotnote: Rogalands Avis. (1979, 11. juni). Condeep-utslep med forviklinger.
The chains intended to hold the structure in place were fixed to new attachment points. Four lengths measuring a total of six-seven kilometres were used.
The chains were of better quality than those used before, since the GBS would be significantly larger. With a breaking strength of 1 500 tonnes, compared with 1 300 tonnes before, they were attached to Lihalsen and Einerneset on the eastern shore of the Gands Fjord, and Vaulen and Kvalaberg on the western side. The attachments were simpler in design than their predecessors. No winches were placed on land, only steel plates set into the bedrock.[REMOVE]Fotnote: Stavanger Aftenblad. (1979, 5. januar). Svær kjetting til Statfjord b.
Slipforming of the cells started at the same time as the school summer holidays. This was important in order to recruit students and thereby obtain sufficient labour. The job was well paid, and it was not difficult to get workers. People had to be turned away. Most of the holiday personnel pushed wheelbarrows, but NC also held courses for them in iron fixing and formwork construction.
This was the most hectic period, with 1 150 people at work. NC’s own personnel accounted for 860 of these. The slipforming continued around the clock for 27 days, making it the world’s biggest operation of its kind until then. A total of 58 000 cubic metres of concrete were poured from wheelbarrows. Each of the latter held 80 litres and, to achieve the desired slipforming speed of 1.5 metres per second, one wheelbarrow had to be filled every three seconds.[REMOVE]Fotnote: Steen, &., & Norwegian Contractors. (1993). På dypt vann : Norwegian Contractors 1973-1993. Oslo: [Norwegian Contractors]: 44.
The work was heavy and a high pace was maintained. Workers were divided into four shifts. After six hours of pushing wheelbarrows or binding rebars, the body ached and fingers were stiff. Concrete was mixed in a plant on a barge moored alongside the GBS.
A dozen temporary office buildings for administrators were also installed out in the fjord. Personnel were ferried to and from the GBS by high-speed craft.[REMOVE]Fotnote: VG. (1979, 12. juni). Betong-gigant PÅ FJORDTUR.
Slipforming the cells was carefully planned, with no margin for error. Hundreds of hydraulic jacks controlled by laser beams thrust the formwork upwards. The job was completed by 18 July, and a temporary halt was called to permit completion of the cells and make preparations for slipforming the shafts. That operation began the following January, and the top was reached on 24 February. The GBS was now no less than 174 metres high. Despite the tight schedule, work was finished a day early.
NC now had to reduce its workforce again, from 650 people to about 350. The 150 employees recruited for slipforming the shaft moved on to other jobs, while many of the remaining 150 returned to jobs with the partners in NC – Furuholmen, Høyer-Ellefsen and Selmer. NC found work for the rest elsewhere, including at Rosenberg Verft. The latter was in the middle of building the Statfjord B topside.[REMOVE]
Fotnote: Rogalands Avis. (1980, 11. mars). På toppen av Statfjord B.
Work on the Statfjord B GBS proceeded largely without dramatic incidents, but one accident did occur in December 1979. This involved a silo containing 50 tonnes of fine-crushed iron ore, a small barge and a loading shovel worth several hundred thousand kroner, which sank in the Gands Fjord. Nobody was injured.
The mishap occurred during discharging of fines (iron ore crushed into small-grained particles) representing half the 40 000 tonnes due to be used as ballast in the GBS base. Two cranes on the ore carrier were transferring this cargo to two silos standing on separate pontoon moored to the platform. Conveyor belts ran from the silos to the GBS.
Without informing the crane driver, the belt from one silo was halted to check some hoses. The driver thought ore was still flowing out of the silo and continued loading even when the latter was full. Thanks to the overload, the pontoon concerned developed a list, the legs supporting the silo broke and the container fell onto a barge moored alongside and carrying a loading shovel. Silo, iron fines, barge and shovel vanished in 243 metres of water and a thick layer of bottom mud.[REMOVE]
Fotnote: Stavanger Aftenblad. (1979, 21. desember). Shovel og silo gikk til bunns.
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MRV had specialised in recent years in building gas carriers, but was now going to outfit a module support frame (MSF) covering no less than 7 800 square metres. Its Rosenberg Verft yard in Stavanger had to be further developed before work could begin.
The latticework MSF was to be established on four concrete pillars which corresponded exactly with the tops of the GBS shafts. Installation work started in November 1978. Space also had to be made available for storing materials, building modules and – since the labour force would necessarily expand considerably – places to eat, sleep and work. Rosenberg Verft had 1 700 permanent employees. In addition, blue-collar and white-collar workers from a number of sub-contractors, service companies and Mobil had to be found space at the yard’s Buøy site. Some 3-4 000 people were due to be working there during the Statfjord B project.[REMOVE]
Fotnote: Roalkvam, G., & Stavanger jern- og metall. (2002). Fra ambolt til plattform : Jern- og metallarbeiderne i Stavanger. Stavanger: Wigestrand: 149
Four hectares were added to the site, in part by filling in the bay off the yard and burying the Kattaskjæret rocks – where the topside was to stand – under spoil. The seabed was blasted and dredged to install a deepwater outfitting quay suitable for both offshore facilities and big ships.
The former mould loft was converted into a drawing office for 60-70 people. Temporary buildings were established in the quay area to provide accommodation for 300 people and canteens for 500. Rosenberg Verft also had five accommodation blocks with beds for 25-30 people in each.[REMOVE]Fotnote: Nerheim, Jøssang, Utne, Dahlberg, Jøssang, Lars Gaute, Utne, Bjørn Saxe, . . . Kværner Rosenberg. (1995). I vekst og forandring : Rosenberg verft 100 år 1896-1996. Stavanger: Kværner Rosenberg: 372.Blasting work was completed on schedule in mid-February. The four concrete pillars to support the MSF were ready to be towed out of the dock in late April and in position during May.[REMOVE]Fotnote: Nerheim, Jøssang, Utne, Dahlberg, Jøssang, Lars Gaute, Utne, Bjørn Saxe, . . . Kværner Rosenberg. (1995). I vekst og forandring : Rosenberg verft 100 år 1896-1996. Stavanger: Kværner Rosenberg: 372-375.
The MRV board also resolved in February to invest another NOK 140 million in upgrading the facilities. Just over 1.4 hectares of land was acquired to accommodate new warehousing, changing rooms and a canteen. Two warehouses were built for intermediate storage of shaft equipment, along with a temporary pipe welding shop. In addition came a new sandblasting and painting shop, further production and transport equipment, and a new office and administration building.[REMOVE]Fotnote: Nerheim, Jøssang, Utne, Dahlberg, Jøssang, Lars Gaute, Utne, Bjørn Saxe, . . . Kværner Rosenberg. (1995). I vekst og forandring : Rosenberg verft 100 år 1896-1996. Stavanger: Kværner Rosenberg: 373.
Work advances in Fredrikstad and Egersund
The latticework MSF was to be built in two identical halves at Fredrikstad Mekaniske Verksted (FMV) south-east of Oslo and Kværner Brug Egersund (KBE) south of Stavanger respectively.
Eighty people worked at the latter on a structure measuring 114 by 55 metres, with a height of 14 metres to the main deck. The total weight of this colossal frame was no less than 2 400 tonnes. Its steel plates were up to 50 millimetres thick.
The timetable was tight, and delays could have serious consequences for the rest of the project. Whether the Egersund and Fredrikstad yards would succeed in meeting their delivery deadlines was the first major source of uncertainty in the construction of the Statfjord B topside.
Both fabricators fell a little behind schedule initially because of problems with approval of welding procedures. Welders had to be certified to the American ASME standard, and needed a special course to achieve the required G-6 grade. The weld quality demanded was very high, and it took longer than expected to get the necessary procedural tests approved.
The problem was overcome, partly because in-house welders acquired the necessary certification and partly by hiring in specialists from Sweden and Finland. In addition, the yards succeeded in getting the delivery date extended by two weeks because a good deal of extra work was added for the MSF sections.
KBE operated at full throttle, even during the Easter holiday. The Directorate of Labour allowed it to work throughout the public holiday except for Easter Sunday, when the yard itself wanted a well-earned break.
It was not difficult to get people to work at Easter. Many of the personnel at the yard came from other parts of Norway or the Nordic region, with a long journey home for just a few days off. The financial advantages of working on public holidays were another motivating factor.[REMOVE]
Fotnote: Stavanger Aftenblad. (1979, 17.april . Travel påske ved Kværner.
FMV built the other section in parallel. The work progressed, but the yard had problems recruiting qualified welders. Other Norwegian yards had promised to help with skilled personnel, but few actually turned up. FMV accordingly had to hire 150 specialist welders from Sweden, and eventually eliminated the delays.[REMOVE]Fotnote: Nerheim, Jøssang, Utne, Dahlberg, Jøssang, Lars Gaute, Utne, Bjørn Saxe, . . . Kværner Rosenberg. (1995). I vekst og forandring : Rosenberg verft 100 år 1896-1996. Stavanger: Kværner Rosenberg: 376.
When the FMV union downed tools in May for a one-hour “political” strike, along with 250 white-collar staff, a number of people expressed concern about progress with the Statfjord B project. The stoppage was implemented to persuade the government to secure new work for the yard. Like the rest of Norway’s shipbuilding industry, FMV was hard-hit by the international crisis in the shipping industry.
The union branch decided at the same time that all overtime working would halt immediately and demanded that further recruitment of contract labour should cease. The Swedes and Finns already at the yard were allowed to remain.[REMOVE]Fotnote: Demokraten. (1979, 9. mai). Vil forsinke utbyggingen på Statfjord B.
Til tross for uroen blant verkstedarbeiderne ble den justerte fristen 14. juli 1979 overholdt. 15. august var dekksrammen i Egersund ferdig, også det innen fristen.
Despite the unrest among the yard workers, the adjusted deadline of 14 July was met. KBE also completed its section of the MSF by the set date of 15 August.
Once the expansion and upgrading of Rosenberg Verft’s Buøy site had been completed, work began on prefabricating equipment for mechanical outfitting of the GBS shafts. This included decks, stairs, ladders, platforms, foundations and ventilation channels, which could then be lifted into the shafts as the latter were slipformed.[REMOVE]Fotnote: Roalkvam, G., & Stavanger jern- og metall. (2002). Fra ambolt til plattform : Jern- og metallarbeiderne i Stavanger. Stavanger: Wigestrand: 149.
The equipment was commissioned at the yard by MRV’s own personnel, while installation in the nearby Gands Fjord was carried out by sub-contractors.
Things went a little slowly to start with. Rosenberg Verft failed to increase its prefabrication workforce to the planned level. The work fell steadily behind schedule, and the management sent a request to Mobil for an extension of the deadline. This was refused point blank. To boost progress, new steps were taken in May to recover the time lost.
As early as 1978, the local union branch and the management had entered into an agreement on the use of contract labour. Nobody wanted the number of permanent employees to exceed a natural workload. In order to execute the project within the tight deadline, it proved necessary to hire in people and allocate part of the work to sub-contractors.
The union and the management agreed to give priority to reputable Norwegian companies who were able and willing to accept full employer responsibility for their own personnel while they were engaged on Rosenberg Verft’s premises.[REMOVE]Fotnote: Roalkvam, G., & Stavanger jern- og metall. (2002). Fra ambolt til plattform : Jern- og metallarbeiderne i Stavanger. Stavanger: Wigestrand: 375.
Workers were hired as far as possible from Norwegian industry, but MRV also had to take people from the rest of the Nordic region. Domestic personnel were in particularly short supply in such skilled trades as specialist welding and sheet metal work, so Swedes and Finns had to be recruited.
Under the deal with management, the local union had the right to express its views on which companies should be asked to tender for various jobs. It received help from the Norwegian Union of Iron and Metal Workers (NJMF) centrally to identify which companies were responsible and which could not be recommende.[REMOVE]Fotnote: Rogalands Avis. (1979, 21. november). Leigefirmaene skor seg.
Ali Installation A/S, for instance, was a subsidiary of Sweden’s Asken Industri AB. It had long experience of platform building in Stavanger, having leased substantial numbers of workers to Aker for outfitting the shafts of the Beryl A and Statfjord A GBSs a few years earlier. Some 70-100 specialist welders were recruited from this source.[REMOVE]Fotnote: Nerheim, Jøssang, Utne, Dahlberg, Jøssang, Lars Gaute, Utne, Bjørn Saxe, . . . Kværner Rosenberg. (1995). I vekst og forandring : Rosenberg verft 100 år 1896-1996. Stavanger: Kværner Rosenberg: 376-380.
Particularly stringent demands were set for welding pipe – and a lot of pipe was welded at Rosenberg Verft during this period. A welder had to demonstrate that they could weld in an arc or circle, and not just along a straight line.
When welding pipe, it was not always possible to get at the weld site from the inside. The seam between the pipe ends therefore had to be filled right through. And the filling had to display an exactly even pressure throughout its length, entirely free from pockets or irregularities.
Welds were carefully checked on a daily basis with such methods as X-rays and ultrasonics. No cavities were tolerated, and quality control was carried out by several bodies.[REMOVE]Fotnote: Statoil magasinet. (1980). 1.
Work was to begin in May, but this proved impossible because materials had not been supplied by the engineering management contractor (EMC), a joint venture between Brown & Root and Norwegian Petroleum Consultants (NPC).
Rosenberg Verft received both ordinary and isometric[REMOVE]Fotnote: En isometrisk tegning viser to sider av et objekt, I tillegg til topp eller bunn. Alle vertikale linjer tegnes vertikalt. Alle horisontale linjer tegnes med 30º vinkel I forhold til horisonten.drawings from EMC, but the quality of these and of the specifications was poorer than the yard had expected and too many of them had to be revised.[REMOVE]Fotnote: Aftenposten. (1979, 15. mars). Statfjord B efter tidsskjema, men skal stå fullført i tide.
The cellar deck
Deliveries of drawings and materials had been late throughout the spring of 1979, and outfitting work for the topside was behind schedule. During the summer, however, drawings and materials for several months of work were delivered to Rosenberg Verft. With its contract personnel, the yard had secured a sufficient workforce to increase the tempo and recover some of the lost ground.
Both sections of the MSF were delivered in accordance with the revised schedule. The first structure from FMV was installed on the pillars at Kattaskjæret on 10 August, with the second from KBE following on 21 August.
These were large and heavy units which had to be positioned with a precision measured in millimetres. Local daily Stavanger Aftenblad had a reporter on the spot when the MSV section from KBE had to be moved 80 millimetres to provide the space to weld in the connection piece. He was clearly impressed by the precise character of the work.
Weighing 2 400 tonnes, the section was moved by emptying ballast tanks in the barge on which it lay so that only 55 tonnes continued to rest on the pillars. Project planner Per Gunnar Andersen at Rosenberg Verft explained how the operation was conducted: “We then jack it only 80 millimetres in, so that we have three millimetres of clearance between the girder and the connection piece.»[REMOVE]
Fotnote: Stavanger Aftenblad. (1979, 4. september). Varmt som i badstu og tre millimeter klaring.
Three millimetres was not much on a structure which extended 20 metres above the sea surface, but was crucial for welding the two sections together with the six connection pieces.
This was tough and hot work. Specialist welding was carried out inside the hollow steel girders which made up the MSF. Space was limited and ventilation minimal. The internal temperature was 70-80°C because the steel had to be heated to 125°C before welding could begin. Such preheating was necessary if the steel plates – up to two inches thick – were to harden properly. It was accomplished by placing heat mats on the weld area.
However, the heat propagated through the steel, and a welder could only remain inside a girder for 15 minutes at a time before they needed to breath fresh air and let somebody else take over. Each welding team comprised three people who constantly changed places.[REMOVE]Fotnote: Stavanger Aftenblad. (1979, 4. september). Varmt som i badstu og tre millimeter klaring.
Once the two sections had been joined, they comprised that part of the topside structure known as the cellar deck. This was divided into a total of 15 areas with space for masses of equipment and structures. Fourteen of these areas were built and outfitted by Rosenberg Verft. Because they lacked walls and roofs, these were called “pancakes” – by contrast with the Lego-like modules to be placed on top of the MSF.
Lifting into cells and shafts
The Uglen crane ship owned by the Grimstad-based Uglen group began lifting the first load of equipment into the GBS cells in mid-August 1979, only a week behind schedule. This vessel carried a crane 110 metres high with a lifting capacity of 450 tonnes.
Work went according to plan, and collaboration between GBS builder Norwegian Contractors (NC) and MRV functioned well. The high crane on Uglen was demounted in October for a break until the work of lifting decks and equipment into the shafts began.
The ship returned in March, when slipforming of the shafts had reached the full height of 171.3 metres – 58 of them beneath the surface of the sea. This work was completed one day ahead of schedule.
Rosenberg Verft had been given six weeks to lift in the equipment, which was all due to be installed by mid-October 1980. Prefabricated decks and other hardware were carried by the crane ship from the yard to the fjord where the GBS lay, and lifted directly into the shafts.[REMOVE]
Fotnote: Nerheim, Jøssang, Utne, Dahlberg, Jøssang, Lars Gaute, Utne, Bjørn Saxe, . . . Kværner Rosenberg. (1995). I vekst og forandring : Rosenberg verft 100 år 1896-1996. Stavanger: Kværner Rosenberg: 378.
Each component was attached to the hooks on Uglen at the yard and hung from the crane throughout the five-kilometre trip to the mooring site of the concrete structure.
This work began on 16 March 1980. The individual decks were first hoisted into the utility shaft before the work of connecting them to the concrete walls started. Great accuracy was required and depended on stable weather conditions. The crane driver had to manoeuvre very precisely, since a single deck could weigh up to 400 tonnes and its clearance from the concrete wall was no more than 40 millimetres.
A good deal of the equipment due to be installed was large and difficult to put in place. The tanks for ballast water, for instance, were 11.5 metres long and six metres in diameter. Once lifted 115 metres, they allowed little room for error when being lowered into the shaft.[REMOVE]Fotnote: Status (1980). nr 5-6. Nytt fra Statfjord.
Lifting into the topside
Plans called for the MSF to be ready for module loading by 8 December 1979. In fact, the lifting operation began before that date, and a number of the prefabricated “pancakes” were put in place during December. Mobil was very pleased with the progress. A full storey of modules was installed on the MSF, and topped in its turn by a new set of 21 modules. Each of the three stories was 14 metres high.
The lifting operation was conducted over four periods. Installation in the actual MSF took place during December 1979. Seventeen modules, equipment packages and not least the quarters followed in May 1980. Dutch crane ship Balder lifted a total of 10 000 tonnes in this round, with the heaviest single lift – 1 200 tonnes – needing to be installed on the topside with 35 millimetres of clearance on each side.
Modules came from both Norwegian and foreign fabricators. These structures were packages of equipment as well as three complete quarters modules, each eight stories high.
Balder was positioned between Rosenberg Verft and the maritime college on the other side of the fjord, and moored with cables attached to six points on land at Karlhammeren, Ulsnes, Rosenberg and Tjuvholmen. The sound is 200 metres wide at this point, so there was not much room for other shipping.
Since it had a displacement of 20-25 metres and the water depth at Rosenberg Verft’s quay was only 12 metres, Balder lay in the middle of the sound and blocked the shipping channel into the port of Stavanger. Lifting operations had to be suspended for a few hours every day and the mooring lines slackened for ships to pass. Small craft could take a small diversion through the islands to reach harbour.[REMOVE]Fotnote: Stavanger Aftenblad. (1980, 6. mai). Kjempeløft tross tåken.
Balder’s sister ship, Hermod, was ready on 23 June 1980 to perform the final topside lifts on the. Because of delays at the Franco-Norwegian joint venture UIE/Sterkoder in Kristiansund, Hermod was nevertheless forced to return in November to lift on the drilling modules. Everything was then in place except the 120-metre-long flare boom. This distinctive component was not installed until the topside had been mated with the GBS at Vats.
Modules from Stord
After losing the topside contract, Stord Verft had secured responsibility for nine prefabricated pancakes. But the biggest job at Stord went to Leirvik Sveis in the form of the quarters modules. This company was responsible for the whole project from design to procurement and fabrication.
Leirvik Sveis had also built the quarters module for Statfjord A, but then as a sub-contractor to Stord Verft. It now entered into a direct contract with Mobil after lengthy negotiations, as chief executive Harald Karlsson recalled:
“I think we actually negotiated with them for six-eight weeks. We were inexperienced in such talks. They were all conducted in English, which we weren’t used to. We hardly understood everything we negotiated on – and in any event not the insurance terms.»[REMOVE]Fotnote: Myklebust, A., & Leirvik sveis. (1996). Leirvik sveis 50 : Jubileumsbok for Leirvik sveis. Stord: [Leirvik sveis]: 116.
Leirvik Sveis – known colloquially as “Sveisen” (the Welding Shop) – had 50-70 employees. The company decided that it would stick with the job it was best qualified to do, namely the steel work, and use sub-contractors for everything else. It did not create its own organisation for the disciplines contracted out, but allowed the sub-contractors to establish their offices close to the fabrication site.
Engineering services were purchased from Norconsult in Oslo, where 30-35 people worked exclusively on Statfjord B. The quarters modules also included the helideck, which was fabricated at Stord Verft, and a helicopter hangar. The latter had not been part of the Statfjord A job.
The modules were constructed in the space of a year and employed 300 people at peak. With the aid of sub-contractors and about 50 contract administrators, the work was done on schedule.[REMOVE]Fotnote: Bergens Tidende. (1980, 19. april).
Exemptions from the Working Environment Act
Several of the module-builders failed to complete their work on time. Rosenberg Verft accordingly had to take over part of the work so that the pancakes and modules could be installed on the topside. A total of 1 900 people were at work on the structure by 30 April 1980, including 800 personnel acquired via sub-contractors and temporary personnel agencies.
During the summer, the yard was still short of specialist pipe welders. But the lack of electricians and instrumentation installers was also beginning to be parlous. Neither EGA or Incom, responsible for electrical and instrumentation installations respectively, were able to secure enough skilled personnel in time. The Statfjord B topside began once again to slip behind schedule.
To secure the necessary workers, Rosenberg Verft launched a major advertising campaign and contacted labour exchanges directly throughout the country. It was looking for pipefitters, specialised welders, sheet metal workers, heat treatment operators, crane drivers, transport workers, electricians and cleaners. But the response was poor.
The yard was accordingly forced to turn to expensive agencies. While the topside contract had allowed for using external personnel, the need was greater than expected. Hiring in personnel was more expensive than recruiting employees. The yard had to make extra payments under collective wage agreements for living away from home, as well as meeting the cost of accommodation, food, travel home and agency management.[REMOVE]
Fotnote: Stavanger Aftenblad. (1980, 19. januar). Kostbare leiefolk.
To use contract personnel, Rosenberg Verft had to secure an exemption from Norway’s Working Environment Act. This was granted for the first three months by the County Employment Office without difficulties. Beyond that point, an application had to be made to the Directorate of Labour, which took a very serious view of a long-term arrangement.
The Norwegian Confederation of Trade Unions (LO) was also sceptical about temporary personnel agencies and extensive use of contract labour. Such workers wanted different working time arrangements than permanent employees, drove up wages and increased inflationary pressures.
According to the Working Environment Act, it was forbidden for employees in one company to do work for another firm which already had personnel able to do jobs of the same kind or who pursued a business where such work formed a natural part of the activity.
The LO could not accept breaches of Norwegian law in order to execute major development projects, and blamed the government and the developers for setting construction deadlines which were too short. According to the confederation, financial considerations were being prioritised ahead of socio-economic aspects and it would fight this.
Most of the contract personnel wanted to work three weeks in a row, including weekends, and have the following week off. The normal working time was four weeks work with Sundays off and the following week free. Working on Sundays contravened the Working Environment Act, but Rosenberg Verft nevertheless applied for an exemption.
Its calculations for the topside contract had included the opportunity to work on Sundays and to hire agencies workers as and when necessary.[REMOVE]Fotnote: Bergens Tidende. (1980, 10. mai). Gjestearbeidere – oljealderens rallar.
Both the union branch at the yard and the Federation of Norwegian Industries (MVL) recommended that the application should be granted. Changing to three weeks continuous work would benefit not only all long-distance commuters but also the progress of the project.
The yard had an exemption until May 1980. Contract personnel lived for three weeks in the work camp and then had nine days at home. This meant they could have as normal a family life as possible. But using contract workers and exemptions from legal working time were the subject of intense discussion in the media during the spring of 1980, and the personnel involve found themselves squeezed between the Norwegian Working Environment Act and a desire to live as normally as possible.
With only three weeks in the work camp, the need for consolation drinking and drunkenness in the quarters would be reduced. It was maintained that making camp residents work four weeks at a stretch with Sundays off would guarantee drunkenness and fighting on the third weekend.[REMOVE]Fotnote: Bergens Tidende. (1980, 10. mai). Gjestearbeidere – oljealderens rallar.
An important consideration for the LO was that such an arrangement would not only apply to the long-distance commuters but also involve a number of the permanent employees. Its national organisation demanded respect for the law, and the issue went all the way to the Ministry of Local Government and Labour. Both Mobil and particularly Statoil put heavy pressure on the government to secure exemptions.
In addition to the working time issue, MRV had to secure permission for further recruitment of contract workers. This issue rumbled on in the media for a long time. Finally, the company reached a compromise settlement with the ministry and the LO which exempted the yard from the provisions of the Working Environment Act from 1 July 1980 to 1 April 1981. While it was admittedly refused permission for Sunday working, Rosenberg Verft was allowed to operate a three-week tour where employees had to be back at work after just seven and a half hours instead of the legal minimum of 10 hours.[REMOVE]Fotnote: Norges Handels og Sjøfartstidende. (1980, 2. juli). Statfjord B.
The contract workers earned a good reputation. They worked hard and were skilled at their job. While their hourly pay could be up to 20 per cent higher than for their Norwegian opposite numbers, they were heavily taxed – particularly on their living allowances – and faced a more uncertain future. They could risk being jobless at two week’s notice. But the alternatives were not bright, particularly for the Finns. Their options were either unemployment or substantially lower pay as a skilled worker at a Finnish shipyard.
Work and working time
Welders and sheet metal workers were not the only trades required to complete the topside for Statfjord B. Much of the work on the MSF required scaffolding, both fixed and suspended. Erecting this was a demanding job for specialists.
Much of the scaffolding was on the outside of the structures, and working on it could be both chilly and wet. Work had to be suspended if the wind and rain became too much. As soon as screens were in place, however, the weather was no handicap.[REMOVE]Fotnote: Stavanger Aftenblad. (1979, 4. september). Varmt som i badstu og tre millimeter klaring.
A difficult neighbour
Work on Statfjord B was claimed to have destroyed life for local residents around the yard. While most people in Stavanger celebrated the huge contract and the construction project at Rosenberg Verft, not everyone was equally happy.
Residents on Buøy (part of an island connected to the city centre by bridges) found themselves with a massive building site at the bottom of their gardens. Large lorries thundering past, racket from the yard, the noise of hammers beating on steel and ever expanding work camps with everything these entailed set their stamp on the Bangarvågen area where Rosenberg Verft was located.
“A whole city district raped on Buøy” read one headline in local daily Rogalands Avis during June 1979. The residents felt powerless, and that nobody cared about them. Parents of small children were abused when they tried to curb the traffic. “Look after your kids, keep them in the garden,” was the response from the lorry drivers. “We’re driving on piece rates and short of time”.[REMOVE]Fotnote: Rogalands Avis. (1979, 13. juni). Bydelen som ble voldtatt.
The issue flared up again in September 1980. Under the headline “Come and live with us, Rettedal” – an invitation to the mayor of Stavanger ¬– Rogalands Avis again wrote about the degradation of the residential environment in Bangarvågen
According to residents, the area stank of sewage, it was noisy around the clock and traffic in residential streets was at motorway level. Nobody respected the 30 kilometre-per-hour speed limit. Traffic flowed from 06.00 in the morning to 01.00 the following night. When the shifts changed at 23.30, four buses drove in and out of the residential area.
Noises from the yard never ceased, with banging and crashing around the clock. The worst offender was perhaps the sandblasting shop, which was close to the houses.
In addition came the sewage stench, which derived from a pumping plant in the work camp. Large volumes of sewage from the yard were pumped into the existing drains, and the pressure created a dreadful stink. Residents felt deceived by the city council, which had promised to deal with the problem.
They complained that nobody had initially mentioned any private motoring in and out of the yard, only necessary goods and service traffic. In addition, a new flotel arrived without warning at Bangarvågen in September 1980. Safe Bristolia was a barge outfitted with quarters modules which could accommodate 500 people. When it moored, the residential area was completely surrounded by the Statfjord B facilities.
Residents were at their wit’s end, and invited mayor Arne Rettedal to come and live with them for a week to see for himself how the neighbourhood was being destroyed.[REMOVE]Fotnote: Rogalands Avis. (1980, 23. september).
On the same day this the article appeared in Rogalands Avis, Rosenberg Verft itself asked the city council to look at the issue.
The yard wanted the politicians to decide on speed limits in the surrounding streets, define traffic routes to reduce the constant minor accidents and collisions, and install pavements. In response, the council promised that its executive committee would consider this request at its very next meeting. It also wanted to study plans for MRV and the council to buy out the local residents and convert the whole area into an industrial zone.[REMOVE]Fotnote: Rogalands Avis.. (1980, 9. oktober).
The eventual solution was that Rosenberg Verft should buy up the properties in the Bangarvågen and Tømmerodden housing estates, which bordered the yard. Stavanger council would provide replacement housing sites. Although this was not finally decided at the time, it looked likely that MRV would also build the Statfjord C topside.[REMOVE]Fotnote: Rogalands Avis. (1980, 22. november).
Few accidents occurred while constructing the Statfjord B topside, but a bomb threat was received in April 1980. “I have a message,” an anonymous caller told the switchboard at Rosenberg Verft. “Things will happen on Statfjord B tonight. I hope there won’t be many people on the platform.”
The police fine-combed the whole topside without finding either bombs or anything else which might be related to the threat. Work was not interrupted, but the meal break for the evening shift was extended by an hour while the police searched the yard. Nobody was evacuated.
It proved impossible to establish who was responsible for the threat, and no more were received. The case was shelved.[REMOVE]Fotnote: Stavanger Politikammers arkiv. Justissaker. Sak 2373/80.
The final lap
Dutch crane ship Balder returned to Stavanger in November in order to lift the last modules from their transport barges and onto the topside. The sailing channel into Stavanger was again closed, as with the two previous lifting operations. This job was pursued without incident, and the channel could be reopened just two days later.
Progress with the project was good towards the end of 1980, although parts of the installation work lagged a little behind. More personnel were brought in, with 2 555 people employed on the topside in January 1981 – 800 more than planned.
But the Christmas holidays disrupted efforts to speed up the job. Part of the instrumentation, electrical, insulation, painting and equipment testing work was not completed in time, and had to continue at Vats and out on the field.
In mid-March 1981, the barges which were to carry the topside to Vats for mating with the GBS were in place. The structure was lifted off the pillars on 20 March.
Time for celebration
Rosenberg Verft held open house on 1 March 1981. Special invitations were extended to the families of employees to visit the site and get to know the workplace. Most of them were inside the yard gates for the first time.
They were given a guided tour of the topside and allowed to eat as many buns and Danish pastries as they could manage. Lemonade, ice cream and coffee could be consumed while Buøy School‘s marching band paraded around and played.
Once the construction of the Statfjord B topside had been completed, MRV also invited its employees and a number of other guests to a big party in Stavanger’s Siddishallen ice rink. Three thousand people assembled for entertainment, food and drink. Praise and flowers were shared out, along with NOK 300 000 to Stavanger’s Central Hospital.
The mood was further enhanced when MRV announced that it had resolved to construct a new welfare building for its Stavanger workforce at a cost of NOK 5 million. This would stand outside the actual fabrication yard, and provide facilities for physical training and meetings. It was completed in 1983.
More about statfjord b
More about society
Divers had descended to a depth of 55 metres to burn off four solid chains linking the GBS with the attachment points on land which had held the structure in place since it was floated out to the fjord from the Hinnavågen dry dock in June 1979. Without the chains, only four cables held the giant in place.[REMOVE]Fotnote: Statoil. (1981). nr 2.The tow could begin once these were cut.
Nine powerful tugs from three different companies – United Towing in the UK, Germany’s Wijsöller and Dutch Heerema – took a day and a half to move 634 000 tonnes of concrete and ballast north from the Gands Fjord off Stavanger to the Yrkje Fjord in Vindafjord local authority.
Ranked as the heaviest in the world up to that time, the tow maintained an average speed of 1.5 knots. Three tugs pulled from the front, two pushed from behind, two lay alongside the GBS to act as side thrusters, and the last two lay aft of the tow and functioned as brakes when necessary.[REMOVE]Fotnote: Rogalands Avis. (1981, 14. februar).
A total of 100 000 horsepower was deployed.
The voyage headed along the shipping route through the islands north of Stavanger. North of Finnøy, it turned eastwards and rounded Ombo to the south and east before crossing the Nedstrand Fjord and entering the Sandeid Fjord. The route then curved west again into the narrow Yrkje Fjord.
With a deep draught of 62 metres, the tow demanded a minimum water depth of 70 metres. This was no problem along the shipping channel. But the passage between the Brattholmen and Teistholmene islands at the mouth of the Gands Fjord was only 280 metres wide, and the tow’s width was 135 metres ¬– giving a clearance on either side of just 70 metres.
Great caution was needed there. Taking a tow through a narrow channel calls for short towing lines. Propeller backwash will then be so strong when it encounters the GBS that the structure becomes impossible to steer.
Norwegian Contractors (NC) had experienced this itself on the first attempt to tow the Statfjord A GBS. The solution was to use two powerful tugs to push the structure through the channel.
The route was chosen on the basis of detailed investigations. For two years, currents had been measured, meteorological statistics studied and tests conducted in the ship model tank in Trondheim.
Surveyor Bloms Oppmåling had installed a number of theodolites along the route to take sightings from land as a safety precaution. Combined with acoustic electronics on the GBS, it was used to ensure that the tow stuck exactly to the planned route, that nothing surprising occurred, and that the precise position was known at all times. Two systems with independent power supplies ensured that one would remain operational if the other went wrong.[REMOVE]Fotnote: Stavanger Aftenblad. (1981, 20. februar).
The tow was implemented without problems, and the GBS was moored on arrival in the Yrkje Fjord while awaiting the arrival of the topside it was to be mated with.
One of the world’s heaviest lifts
A month later, the topside left Moss Rosenberg Verft’s Rosenberg Verft yard in Stavanger on its way to the Yrkje Fjord. Four large barges had been manoeuvred into place at the yard with the capacity required to lift the structure from the four concrete pillars on which it was built.
Two of the barges were placed outside these supports, while the other two – Goliat 8 and 9 – were placed one atop the other and guided under the centre of the topside. Pumping ballast water out of the barges raised them until they had lifted the topside a couple of centimetres. That was sufficient to free it from the columns in preparation for the tow through the fjords to the mating site in the Yrkje Fjord.
It was not possible to pull the deck free with the tugs, so steel cables were attached to the pillars. As these were winched in, the barges carrying the topside were pulled cautiously forward.
Together with Swedish towing specialist Neptun, NC was responsible for the lift-off at Rosenberg Verft and the tow to Vats. This ranked as the first time a complete factory with an eight-storey living quarters was towed as a single package. The voyage began in the afternoon of 24 March.
The draught of the tow was only 12 metres, so the water depth in the fjords presented no problems for the topside either. Between Spolen and Klovningene just outside Stavanger, however, the passage was only about 300 metres wide, which offered very little leeway.
After maintaining an average speed of three knots, the topside reached the Yrkje Fjord safely in the early morning of Wednesday 25 March. A troublesome east wind meant it had to wait on weather at the mouth of the fjord.
Mating GBS and topside called for almost complete calm, but a weather window opened between two anti-cyclones on the Friday morning, and the operation could begin.
One plus one equals big
After the tugs had manoeuvred the topside over the GBS shafts, cables and winches attached to the latter took over. They repeated the process carried out at Rosenberg Verft, but in reverse. Fine adjustments were made with the aid of jacks, which pushed the topside horizontally.
Virtually no tolerance was permitted when mating the topside and GBS. The circular shafts had to engage with four steel rings beneath the topside within an allowable variation of a few millimetres. It took 100 people on the barges and tugs to bring the deck in line with the steel rings and with the 104 bolts, each as thick as a man’s arm, which were to tie them to the concrete structure.
The GBS was moored throughout the operation, but floating in the water. According to Bjørn Vidar Lerøen, then a journalist with Bergens Tidende, the concrete structure lay like a set of submerged lemonade bottle with only the lips for attaching the crown cap showing.[REMOVE]
Fotnote: Bergens Tidende. (1981, 26. mars).
Only 6.5 metres of the 177-metre-high unit was visible above the water.
Once the topside had been correctly positioned, water was pumped out of the GBS ballast tanks so that it slowly rose and eventually lifted the whole topside off the barges and onto the shafts.
The whole operation was an application of Archimedes’ Principle – if the weight of a submerged vessel is reduced, it will rise in the water. In this case, the submerged vessel was a concrete giant with a displacement of 550 000 tonnes. That meant a lot of water had to be removed from the concrete cells, and it took three days before the topside had reached its planned height of 50 metres above the sea surface.
This represented one of the most impressive marine operations the world had so far seen. To achieve the smoothest possible transfer of weight from the barges to the GBS, the former were also ballasted down with water and slowly sank lower in the sea as the concrete structure rose.
The topside was positioned with an accuracy of five millimetres. Its full weight had been transferred by Sunday 29 March and the barges could be pulled away. Eight people staffed the control room in the GBS’s utility shaft and controlled the ballast pumps in the structure, 160 metres below sea level.
Once the deck had been mated with the GBS, work could begin on hooking up cables, piping and all the other systems tying together the two components.
The work of commissioning the platform had been well planned. Phase one, the initial hook-up, was handled by 150 people NC had ready in Vats. After that, Rosenberg Verft and Mobil took over the work site and some 1 000 new workers arrived to hook up countless more modules and components – both between the GBS shafts and the topside, and between various parts of the latter.
A new, comfortable work camp with beds for 462 people had been installed on the slopes above the quay area at Raudnes. A number of barges supporting temporary accommodation had also been towed into the fjord and moored.
In addition, a couple of hundred workers could be accommodated in the living quarters on the actual platform. Temporary offices, canteen and sauna had been established.
NC had built a new quay, and a daily ferry service to and from Stavanger was in operation. The boat from Rosenberg Verft left every morning at 08.00 to transport workers and visitors to the construction site. This trip took 90 minutes.
High and low voltage power lines had been laid to the construction site, and a new sewage system was installed with a treatment plant. A subscriber trunk dialling phone service was provided, although Vindafjord was the only local authority in Rogaland without STD at that time. NC had also helped to finance a new road from Åmosen to Raudnes.[REMOVE]Fotnote: Stavanger Aftenblad. (1981, 21.februar).
The labour force observed an offshore tour system, and lived at Vats while at work. They were looked after well ¬– the food from Bergenske Catering became known for its “offshore” standard.
A dedicated welfare secretary ensured that leisure activities were many and varied. These included outings to see the flowers in the Hardanger Fjord, boat hire for angling and film shows twice a week. Outings to nearby Haugesund were organised at the weekend – either to and from on the same day, or with an overnight stay from Saturday to Sunday. Various sporting activities were pursued, the library was well stocked and distance learning courses could be taken.[REMOVE]Fotnote: Rogalands Avis. (1981, 18. mars).
Among those who won contracts for the commissioning of Statfjord B was Alvide Berge from Sinnes in Sirdal, popularly known as Shipowner Tina. She had six boats at Vats, used to ferry personnel to and from the platform out in the fjord. In addition, her Oanes car ferry served as headquarters for the operations management.
Berge had started her little company as early as the construction of the Statfjord A GBS in the Gands Fjord, providing boats which shuttled between Hinnavågen and the concrete structure with everything from plastic buckets to passengers.[REMOVE]Fotnote: Stavanger Aftenblad. (1981, 28. mars).
The work in the Yrkje Fjord took four months, and one of the last structures to be installed was the flare stack. This 155-metre-long unit was lifted into place in a single operation by the world’s largest crane ship, Hermod, which arrived in June.
On 17 June 1981, Statfjord B was named by lady sponsor Agnes Rettedal. She was the wife of Arne Rettedal, mayor of Stavanger at the time. Thirteen days later, the platform set off on its last voyage – and more world records were broken.
More about statfjord b
Another project team was accordingly appointed by the licensees to consider alternative development solutions for the northern part of the field. This work was to take account of reservoir properties, safety, and operational and maintenance friendliness. But the main emphasis would be on simplifying equipment, reducing weight and optimising construction methods. The concept had to be cheaper than Statfjord B.
Variations on the table ranged from a subsea development to a two-platform solution. One question was whether Statfjord C should be a satellite to the A platform, with drilling capacity alone, or a separate structure with processing and storage facilities.
The first option was a combined drilling, quarters and water injection platform with a daily production capacity of 285 000 barrels. It would have a concrete substructure, but without drilling or loading opportunities.
Produced oil would be piped directly from the wellhead to Statfjord A for processing. The drawback was that this would not be possible until output began to decline on the A platform and spare capacity became available.
The second solution was an integrated production, drilling and quarters (PDQ) platform with water injection capabilities, which could process 180 000 barrels per day (b/d) and transfer a further 150 000 b/d to Statfjord A. This would be supported on a steel jacket, and the use of tankers for both storage and loading of crude was envisaged.
The final option considered in this round was a PDQ platform with 180 000 b/d in processing capacity. It would rest on a three-shaft Condeep concrete gravity base structure (GBS) with storage. Loading would use the buoys on Statfjord A and B.
Further studies of detailed estimates for costs and timetables were carried out with these variants until 22 January 1980, when the licensees decided on the third option – an integrated PDQ platform.
To benefit from both time and cost savings, Statfjord C was intended to be a duplicate of the B platform. But this was not achieved – it was only an approximate copy of Statfjord B. The differences were not necessarily easy to spot, but had great significance for production, safety and living conditions.
The biggest change was that the C platform was dimensioned to produce 210 000 b/d from 19 wells, compared with 180 000 from 15 wells on Statfjord B.
Since the gas processing train on Statfjord C had been completed when the platform reached the field, it became the first installation on the field to deliver to the Statpipe network running to Kårstø north of Stavanger and on to Emden in Germany via Ekofisk.
The most visible change was the helideck, which was elevated to avoid the wind forces and turbulence created by the drilling module on Statfjord B. Because the helideck on the latter was below the level of other structures, helicopter traffic to and from the platform had faced problems. When the wind was in a certain direction and stronger than a stiff breeze, flights could neither land nor take off. So the Statfjord C helideck rose high and free above the rest of the topside, as if on stilts.
The size of the living quarters was also increased, from 200 berths on the B platform to 272. This was achieved by placing an extra storey of cabins on top, and moving the stairwells to the sides. An additional storey for ventilation equipment was installed above that again.
Seabed conditions at the northern end of the field, where Statfjord C was to be installed, were firmer than further south. This meant that the base of its GBS did not have to be as large as it was on B – 14 000 square metres compared with 18 000. The design of the steel skirts under the base was amended.
Since the plans called for a larger production capacity, the diameter of a number of pipes had to be increased. At the same time, the tanks for separating gas from oil were provided with new internal equipment to boost their efficiency.
Another type of gas dewatering facility was also specified. This involved a contractor pump to remove water from the gas with triethylene glycol, instead of injecting glycol into a heat exchanger. A similar system was later installed on both A and B platforms.
Other equipment made it possible to increase water injection rates to 296 000 b/d – and actually as high as 350 000 b/d if necessary – compared with 272 000 b/d on Statfjord B. In addition, ballast pump capacity was expanded. But the main structure and most of the equipment were indeed copied from the B platform.
Approved and initiated
The official approval given for Statfjord B also applied to the C platform, and the concept for the latter was approved in a letter to operator Mobil on 24 December 1980.
Norway’s offshore supplies industry was impatient to get going on the third Statfjord platform. Employment in the engineering industry was still down in 1979, and a rapid development was the only way to close the gap facing the Norwegian oil-related industrial sector.
After the licensees had resolved to build Statfjord C, however, rumours began to circulate of changes to petroleum taxation in Norway. The price of crude oil had risen sharply, and the Norwegian government wanted to capture more of the consequent profits. It planned to raise tax on these earnings from 70 to 80 per cent. Such schemes create problems.
International conditions provided the background for the rising prices. Put briefly, Egypt signed the Camp David accord in 1978. Iraq maintained that this represented a betrayal of the Arab cause, and only Saudi Arabia prevented Egyptian isolation at the Arab summit in November 1978.
The consequence was instead that the Saudi role in the Organisation of Oil Exporting Countries (Opec) was weakened. Its efforts to secure moderation on the issue of raising oil prices accordingly failed to win through at the Opec meeting in December. The organisation raised prices by 10 per cent during 1979.
This was paralleled by political unrest in Iran. The Shah’s position had been weakened since the autumn of 1978, and extensive strikes at Iranian petroleum facilities reduced production. Panic began to spread in western oil markets. The Shah was forced to leave Iran in January 1979 and Ayatollah Khomeini came to power two months later.
Iranian oil production continued to decline, creating uncertainty in the market. Opec failed to bring oil prices under control in the spring and summer of 1979, demand rose and spot prices reached new heights. High spot prices also prompted producers to demand supplements on the official price, which boosted their revenues. The Norwegian government wanted to secure its slice of these increased profits through higher taxes.
A number of the Statfjord licensees were unhappy at the thought of tax changes, and wanted to discuss a possible cancellation of the C platform. Mobil took the lead on these efforts.
Investment costs were weighed against income potential, and showed – according to Mobil’s calculations – that the new operating parameters imposed by the government would make the profitability of Statfjord C doubtful. Unless income for the Statfjord licensees was improved, Mobil would propose that the platform be dropped.
The shipyard crisis was still not over in 1980, and a refusal to build Statfjord C would have had serious consequences for jobs in Norway’s engineering industry. Some eight million working hours would be lost. The Federation of Norwegian Industries (MVL) accordingly supported Mobil and took contact on its own account with the Ministry of Industry. It feared that the new tax rules might prompt the postponement of construction contracts.
Opponents of the new tax argued that three platforms would make it possible to regulate production in a way which ensured optimum utilisation of all the installations and the whole field. For its part, the Ministry of Finance maintained that Mobil had failed to take account of the increased oil price in its calculations.
It nevertheless transpired that cross-party consensus prevailed on the tax changes. The main opposition parties – the Conservatives, the Christian Democrats and the Centre Party – found the increase reasonable and accepted the Labour government’s proposal to raise the tax on profits to 80 per cent. The Socialist Left and the Liberals would have been happy to go even further.
A decision on building Statfjord C was due to be taken by the Statfjord Unit Operating Committee (SUOC) in July 1980. Mobil was uncertain about support for its proposal to drop the platform, and proposed a test vote. This showed that the operator was the only opponent of building the platform.
Mobil did not want to be directly voted down, and proposed that the order of voting be reversed so that it did not have to cast a ballot first. Since the majority for building Statfjord C was binding, the operator abstained. Once the decision had been made, however, it tackled the job with great enthusiasm.
The City of Stavanger was sued in 1980 by five homeowners in Hinnasvingen and Hindalsveien, who primarily wanted GBS construction operations in Hinnavågen to cease. They also demanded compensation of NOK 100 000 each for damage and nuisance, or up to NOK 20 000 per property per year for future problems.
The claimants alleged that they were subject to noise and intrusive illumination from the powerful spotlights used at night. Their view had also been destroyed.
While the court agreed that all the properties had suffered nuisance from the activity, this was not of any special character and could not be expected to be different if other industry had been located there. It could not be considered unreasonable. The judge found in favour of the city, and Condeep construction could continue. But the council was not awarded costs.
Since the city had clearly told the homeowners that the construction work was temporary and would not continue beyond 1978, the latter felt they had been misled when it became clear that the work was set to go on for many years.
Source: Stavanger Aftenblad
Constructing the GBS
Constructing the GBSNorwegian Contractors (NC) began work on building the concrete GBS for Statfjord C on 10 November 1980, before the contract had officially been signed, in order to employ personnel it wanted to retain. The sheet pile retaining wall was re-established by 1 December, and notifications issued to shipping in the Gands Fjord.
The NC contract was the first awarded for the Statfjord C construction project, and covered a four-shaft GBS. This structure was virtually identical to Statfjord B, with 20 oil storage cells forming its bottom section. Each cell could store 260 000 tonnes of crude.
NC needed 200 additional permanent employees, and 1 500 people would be working at the Hinnavågen facility during the most hectic phase when the shafts were slipformed. Schoolchildren and students once again had the chance to earn a few thousand kroner during the four weeks that this operation would take.
Installation of the steel skirts to ensure that the platform stood stably on the field started during January. NC’s design personnel only had a short time to do their work before construction began in the dock. Bottom conditions at the Statfjord B and C sites differed greatly, and a completely new base structure was required.
The computers used to calculate pressure, stress and other key conditions lacked the capacity that such machines now possess. It took them 12.5 days to conduct the global analysis ¬– the most extensive of the lot – covering stresses in the concrete.
Physical work in the dry dock could begin on 12 January 1981. Three years later, on 18 January 1984, after a three-day delay because of bad weather, the concrete structure could leave the Gands Fjord off Stavanger for Vats and mating with the topside.
Adding it all up
The concrete GBS had a base area of 12 800 square metres, and 24 cells with an internal diameter of 23 metres. These stood 64 metres high, with the exception of four which were extended as shafts to a height of 176 metres.
With a dry weight of 600 000 tonnes, the structure contained 13 000 cubic metres of concrete and 35 000 tonnes of reinforcement bars (rebars) – equivalent to five Eiffel Towers.
In addition, the project went through three tonnes of coffee, 60 000 pairs of gloves, 3 000 crowbars, 12 000 rebar fixings, 5 000 plastic buckets and 4 000 spanners. But a new communication system meant that consumption of walkie-talkie batteries declined by 200 000 compared with Statfjord B.
The main consultant for constructing Statfjord C was Norwegian Petroleum Consultants (NPC). This company had also worked on Statfjord B, but was now in partnership with Britain’s Foster Wheeler (FW).
A project service contractor (PSC) team was located in Asker outside Oslo. This had two main jobs. The first of these was to provide engineering design services, including work on the tender documents. Sending out such packages of drawings, material specifications and deadlines to be included in a tender was a big job. In addition came receiving, assessing and negotiating on bids and ultimately awarding contracts.
Second, the PSC was to make provision for purchasing equipment and services for the platform. Other tasks included making specialists available to the operator and cost controllers, keep accounts and award contracts. Totalling 340 people, the team comprised three Norwegians for every Briton.
Mobil also had its own staff of 50-60 personnel in Asker, including six from Statoil. This group was known as the project task force (PFT). Its job was to monitor work by the PSC and the other contractors, and to provide advice, conduct checks and issue approvals.
The project management job was simpler and less extensive than for Statfjord B. About 6 000 main and 5 000 detailed drawings were required for the C platform. Fifty per cent of these could be copied directly from the B drawings, 40 per cent had to be revised on the basis of existing documents, and only 10 per cent – a few hundred – of the main drawings had to be created from scratch.
Engineering design was divided among several contractors. NPC did about 60 per cent of the work, primarily on the topside modules and all electrical and installation design. Canada’s Triocean designed the drilling derrick and modules, and Moss Rosenberg Verft (MRV) did the cellar deck. Leirvik Sveis designed and built the living quarters.
The Statfjord group tried to achieve a wider distribution of the topside work on this occasion. It had the quarrel between Aker and MRV over the topside contract for Statfjord B fresh in its mind when putting the C platform out to tender.
But it was difficult for others to compete with MRV over the job, since it had developed a facility tailored for the B topside. Since Statfjord C would be very similar, the Kværner company was very strongly placed. Nobody else turned out to be interested, so the job of fabricating and hooking-up the steel topside went to MRV without competitive tendering.
If MRV was the only candidate for building the topside and its assembly and hook-up, competition was tougher for mechanical outfitting of the GBS shafts. Bids were submitted by NC itself as well as by Aker Contracting ¬– a newly established company which recruited personnel from all Aker group members – and the Kværner-Rosenberg Joint Venture (KRJV) between Kværner group subsidiaries MRV, Kværner Engineering and Kværner Brug.
An initial evaluation found that Aker had the lowest bid and NC the highest, thereby eliminating latter. But none of the bids were in the form Mobil wanted. A new round was held, and the KRJV maintained that it could make an improved offer after securing better terms for materials and services from sub-contractors. It reduced its bid by NOK 25 million.
Mobil was unsure whether this represented a genuine price reduction or an attempt to submit a new bid, and also gave Aker another chance. The two competitors submitted final bids with revised prices. Both had achieved substantial reductions – Aker by NOK 33 million and the KRJV by no less than NOK 72 million from its original bid. The latter accordingly won the job, but the real winners from the big price cut were naturally Mobil and its fellow Statfjord licensees.
Mechanical outfitting of the concrete shafts was performed by a joint venture between Kværner Brug in Oslo, Kværner Egersund and MRV’s Rosenberg Verft in Stavanger. These companies fabricated and installed 9 500 tonnes of decks and equipment in the shafts and cells. These structures were lifted into the GBS by the Ugland group’s Uglen crane ship.
Statoil called for an extraordinary meeting of the SUOC to discuss the assessment of bids for the module support frame (MSF). This was to be built in three sections – two ends and a centre piece. Five bids had been received from Kværner Egersund, Fredrikstad Mekaniske Verksted (FMV), a German yard and two in the UK.
The lowest prices were offered by Britain’s McDermott and Germany’s Howaldtswerke. Both Egersund and FMV were 20 per cent higher. Overall, this meant that the Norwegian yards were NOK 33 million more expensive.
Statoil nevertheless took the view that the Statfjord group should opt for the Norwegian fabricators, who had experience and would probably deliver on schedule. The issue was submitted to the Ministry of Petroleum and Energy, which refused to take a position. Statoil was forced to accept the lowest bids, and the work went to Germany and the UK.
Construction time for Statfjord C was extended by almost half a year compared with Statfjord B, from 30 to 35 months. That reduced the need for peak staffing, and day-to-day work became less hectic. Making the structure a virtual copy of the B platform meant that fewer drawings were needed, with less extra work for MRV, and allowed a number of smaller jobs to be contracted out to other fabricators when the company could not compete on price.
While the construction contracts were virtually the same as for Statfjord B, they contained a built-in performance element. This was intended to encourage the contractors to reach clearly defined sub-targets and increase productivity by 15 per cent on all work to be done on a cost plus basis.
Building a close copy of the B platform yielded benefits. Work proceeded without problems throughout 1982, and the project was ahead of schedule by the end of that year. Forecasts looked even better towards the summer of 1983. Outfitting of the GBS was no less than three months ahead of schedule, and it could be delivered almost three weeks before the original contractual date in February 1984.
Overview of supplier
- Project management: NPC and Foster Wheeler
- Engineering: NPC (module deck, electrical, instrumentation), Triocean (drilling derrick and modules) and Moss Rosenberg Verft (cellar deck)
- Construction concrete GBS: NC
- Mechanical outfitting of GBS: Moss Rosenberg Verft in cooperation with Kværner Brug and Kværner Egersund
- Topside construction and hook-up: Moss Rosenberg Verft
- Fabrication of MSF: Howaldswerke, McDermott and Stord Verft
- Living quarters: Leirvik Sveis
In addition to these main contractors, deliveries and equipment came from about 250 different companies worldwide.
Kostnadsanalysen norsk kontinentalsokkel: report from the management group appointed by royal decree of 16 March 1979, submitted to the Ministry of Petroleum and Energy on 29 April 1980.
Norsk Oljerevy. (1980). no 6. Mobil: Statfjord C fremdeles uøkonomisk.
Norsk Oljerevy. (1983). no 12. Statfjord C – 800 000 tonn stål og betong.