This posting (November 2019) is an update to an October 2013 post which reflects changes to the ASME B31.3 Code relative to severe cyclic service that have occurred since the original post. There has been a fair amount of confusion as to when the rules for severe cyclic conditions in ASME B31.3 should be used, and the rules themselves can be somewhat confusing to apply. In the 2016 edition of ASME B31.3 the definition of when the rules for severe cyclic service are applicable were changed, which may reduce the confusion. The definition as to when the rules of severe cyclic apply is in the 300.2, Definitions. Prior to the 2016 edition, it stated that severe cyclic conditions are: Conditions applying to specific piping components or joints in which SE computed in accordance with para. 319.4.4 exceeds 0.8SA (as defined in para. 302.3.5); and The equivalent number of cycles (N in...
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Impact on Wall thickness for C...
Dear Mr. Becht,
I would like to ask what could be possible impact of cyclic service for the calculated pipe wall thickness under p... Read More
Saturday, 16 November 2019 23:59
Impact on Wall thickness for C...
Designation of a system as being in severe cyclic service does not impact the wall thickness calculations for pressure design. No... Read More
Sunday, 17 November 2019 07:40
SE calculation
Dear Mr.Becht,
My understanding is that the calculation of SE (for comparing to 0.8SA in the evaluation) should include only the d... Read More
Thursday, 08 August 2019 02:03
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