Objective
This project consisted in testing, in a severe marine environment, the dynamic behaviour of a high pressure hose hung in a catenary near the surface, consisting of an endurance test on a "coflexip" hose with an internal diameter of 240 mm maintained at a high service pressure under the conditions prevailing in the north sea
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In view of the considerable number of measurements made, the test has permitted quantitative evaluation of the endurance of a large diameter hose operating at a high service pressure, hung in a catenary near the surface, in a highly severe environment.
The test was performed near frigg field, in the norwegian sector of the north sea. It took place from September 1982 to August 1983. The 135 m long hose was hung between a surface buoy held in position by funicular anchors and a subsurface buoy submerged to a depth of 60 m and anchored vertically by a gravity anchor.
The average span of the arch was 60 m.
The surface buoy was designed so that its incoercible movements, resulting in dynamic stressing of the hoses, would be similar in a 10 m amplitude wave to those of 110,000 ton tanker in a 15 m wave.
It consisted of a cylindrical shell 8 m in diameter and 10 m tall , equipped at its bottom with a 14 m disc so as to reduce heave. A hawser pipe inside the buoy limited the curvature at the head of the hose.
41 sensors provided measurements of the behaviour of the hose. They were picked up in the surface buoy and beamed by radio to one of the frigg platforms, where they were recorded together with the environmental data.
The high pressure inside the hose was kept throughout the experiment. On completion of the test, the hose was subjected to detailed examination and the mechanical and endurance characteristics of its components compared with those of a new hose. No abnormal damage was detected.
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Programme(s)
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Coordinator
92500 Rueil Malmaison
France
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.