When considering wall thickness for offshore pipelines, the pipe must be thick enough to prevent hydrostatic collapse under external pressure but also contain the internal pressure, and consequently the minimum wall thickness t min is calculated. #69901 - 09/07/17 11:04 AM Re: Load cases and allowables in ASME B31.8 and ASME B31. Codes such as IGE/TD/12, PD 8010 1, 6, B31.4 7 and B31.8 8 for transmission pipelines use this approach in calculating nominal wall thickness. Why is it not defined as F2xSh, where F2 is longitudinal stress allowable as per code? Note about, 20 m 6 a Schoolmasters in Holy Orders, 29 11 b31 3 8 61. Appropriate values are 0.72 for pipelines or 0.50 for platform piping and risers.)" 7 e University Club, Quarterly Dinner, 23 ( 9 Ushering in the New Year in. "(B31.8 Chapter VIII - F1, Hoop stress design factor, according to Table A842.22 of B31.8. Where OCC allowable is the same as SUS allowable.Īnother question is, in ASME B31.8 VIII, sustained code allowable is defined as FacxSh, in which Fac is defined as Hoop stress factor(F1) according to CAESAR explanation: Would you confirm these load cases in (ASMEB31.8 VIII) and (ASME B31.8 for Unrestrained piping)? I've read previous discussions but haven't come up with a final answer.
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