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- W1996793514 abstract "ABSTRACT The Frigg pipeline transportation system is made up of two 32 gas lines, linking the Frigg field in the middle of the North Sea to the North East of Scotland over a distance of 370 km and in water depths of up to 150 m. Gas has been produced since 1977 and sold to the British Gas Corporation. Total Oil Marine, as the operator of this transportation system, has since carried out an extensive inspection programme: external inspection such as acoustic survey,(sides can sonar and sub-bottom profiler), and visual survey, either by divers or submersible plus a tentative internal inspection. After assessment of the results and agreement with the relevant authorities some maintenance of the pipelines (i.e. stabilisation) has been carried out. Over the past two years, 1978 and 1979, that the pipelines have been in production, Total Oil Marine has built up extensive experience in the inspection and maintenance of large submarine pipelines in a hostile environment. This experience, i.e. our inspection policy, the inspection methods used and the maintenance operations carried out, are summarized in the following paper. Indications on cost, and evolution of inspection and maintenance methods are also given. INTRODUCTION Our Company, Total Oil Marine, is operator of the Frigg Field Transportation System. This system consists of twin lines which run from the Frigg Field to the Intermediated Platform (MCPO1) and on to the landfall terminal at St. Fergus. The maximum water depth is 150 metres. The system extends into the British and Norwegian sectors of the North Sea. (see figure 1). The pipe was laid between 1974 and 1977 in 44 ft. joints of 32 Outside Diameter 3/4 inch wall thickness X65 steel. These pipes have been manufactured in accordance with API Standard 5LX for High Test Line Pipe and built according to ANSI code B31.8, their maximum working pressure is 2160 psi. Corrosion protection is provided by coal tar enamel, providing electrical insulation, and Cathodic protection by sacrificial zinc anodes every fourteenth joint." @default.
- W1996793514 created "2016-06-24" @default.
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- W1996793514 date "1980-10-21" @default.
- W1996793514 modified "2023-09-27" @default.
- W1996793514 title "Inspection and Maintainance of Frigg Pipeline Transportation System" @default.
- W1996793514 doi "https://doi.org/10.2118/158-1980-ms" @default.
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