Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 9, Part 5American Society of Mechanical Engineers, 1990 - Arctic regions |
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Page 73
... valve . Valve types are therefore discussed in the following order : - Ball Valves · Gate Valves · Check Valves Third Generation Systems Ball Valves Ball valves currently in subsea use are : - . all - welded valves ; end entry valves ...
... valve . Valve types are therefore discussed in the following order : - Ball Valves · Gate Valves · Check Valves Third Generation Systems Ball Valves Ball valves currently in subsea use are : - . all - welded valves ; end entry valves ...
Page 74
... Valves Gate valves are used extensively in the subsea environmental though almost exclusively for small bore subsea well control duty . Only one gate valve ( 8 - inch ) in use as a subsea ESD valve has been identified in the North Sea ...
... Valves Gate valves are used extensively in the subsea environmental though almost exclusively for small bore subsea well control duty . Only one gate valve ( 8 - inch ) in use as a subsea ESD valve has been identified in the North Sea ...
Page 77
... valve cases , the following general findings are of interest : o Increasing the frequency of ESD valve testing ( say from six monthly to annually ) converts ' unrevealed ' to ' revealed ' failures and improves the probability of the ...
... valve cases , the following general findings are of interest : o Increasing the frequency of ESD valve testing ( say from six monthly to annually ) converts ' unrevealed ' to ' revealed ' failures and improves the probability of the ...
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addition analysis applied approach assessment assumed bending calculations caused considered CONTINUE corrosion crack damage deformation depth described diameter direction displacement distribution effect energy Engineering ensemble equations factors failure field Figure flow force fracture function given hole included increase initial installation internal layer length limit load material maximum mean measured mechanical method mode movement obtained occurred Offshore operation parameters pipe pipeline plastic plate platform position predicted presented pressure probability problem procedure properties radial range reduced relative reliability resistance response safety scaling scour seabed shown shows simulated soil solution span stability steel strain strength stress structure subsea surface Table term thickness toughness tracers tube uncertainty values valve variables wall wave weight weld