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Can I use welded pipe for subsea piping system?

asked Oct 13, 2015 in Engineering by lulopez (2,220 points)

2 Answers

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answered Oct 13, 2015 by TPham (5,010 points)
No, ALL Pipes in the subsea design should be seamless.
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answered Feb 1, 2016 by GioTalbott (545 points)

All piping should be designed, fabricated and tested in accordance with the requirements of API 17D, ANSI/ASME B31.8 (design), ANSI/ASME B31.3 (welding), and API RP 1111.

Consider the followings when select pipings for your subsea use:

  • Piping, where applicable, should be designed to accommodate flowline connection generated forces and thermal expansion/contraction of components without causing damage or malfunction.
  • Consideration of fatigue stress caused by thermal cycling should be given where appropriate.
  • Piping design should minimize areas where turbulence induced erosion, corrosion, erosion/corrosion, and cavitation are considered possible.
  • All piping joints should be full penetration welded.
  • Flanged connections may be used where welding is not practical.
  • All flanged connections should provide face-to-face makeup and sufficient pre-load to preclude movement at the faces under all conditions.