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I have not found any clarification on this. Yes will raise a request. Thanks for your comments /suggestion.

Hi, I just want to argue the code is not rationale. For a seismic event, agree it is on top of other load constituents (e.g. pressure, thermal). The maximum design pressure is relevant for this as well (on top of operation conditions) but the acceptance criteria is limited by the UTS factor, not...

Good thought (1503-44). Fatigue due to displacement stress ranges is typically associated with system startup and shut down thermal and pressure cycles. For seismic events, it is one off and ultimate limit state failure and damage is governing. It would appear to me it is a mixed up of two things.

Thank you GD2, XL83NL and Kevin for your passion and relies. Lets put it into the context of code acceptance criteria, and I am trying to get the rationale of 60ksi maximum for B31E's longitudinal stress limit. Mitigation against Brittle failure seems reasonable. However, for large collection...

thread378-516645 Hi All, B31E allows a higher longitudinal stress than the B31.x codes by adopting vessel design codes. But it is limited to 60ksi, i.e. min(2.4S, 1.5Sy, 60ksi) for most piping materials. Can anyone shed light on 60ksi limit? Also there is no criteria for other stress...