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Hello there, ASME B31.3 eq. (3a) or eq. (3b) below is for t＜D/6, while for t ≥ D/6 or for P/SE > 0.385, the standard only said “require special consideration of factors such as theory of failure,effects of fatigue, and thermal stress”. How should I calculate it when in this situation？ Thanks

Most probability is piping isometric drawing，single-line drawing is not a professional term

Thanks a lot It seems mostly depends upon the pressure-raising devices used once the pressure test procedure is finalized.

Hello guys, one question has confused me for a long time. As the requirement of ASME B31.3 345.5.2, a pressure relief device shall be provided during pneumatic leak test. 1. What cases will cause the test pressure to increase, the misoperation of pressure - raising equipment? Or uncontrolled...

Thanks，Everyone. I completely understood，Everyone is so professional

Hi，Forums Piping wall thickness calculation according ASME B31.3 is using the design pressure of pipeline，while the hydrotest pressure is at least 1.5×design pressure. The question is why B31.3 doesn't require to do the calculation check under hydrostatic test pressure？

7.7.3 is tolerance for dimension B，while the question is about D. I didn’t find any requirement in the standard. Depth might be a non-critical dimension and can be confirmed by manufacturer

Really appreciate！

Thanks a million for your response. Actually，the end type of valve is VIAR LOCK hub type with clamps，and valve body is 3 pieces(2 hub ends + 1 body). In this case，two more question need your help 1）Is A-182 F316/316L suitable for materials of clamp？should be 60K minimum or not； 2）Hence they...

What is the work scope of technical manager? Take in charge all designers, arrange design works, or review plan & DOCs? Are there corresponding study courses or books? Thanks Sean

Can ASTM A-182 F316/316L material be used for ball valve body which follows API 6A standard and 10,000psi rating ? API 6A table-7 shows body material designations for pressure rating 69.0MPa(10,000psi) is 36K,60K,75K,NS while the yield strength of ASTM A-182 F316/316L is 205 MPa(30K). So this...

By the way，is my understand right for the PWHT exemptions for P-No. 1 material in table 331.1.3 a）thickness＞25mm：preheat of 25℃ + multiple layer welds b）thickness 5～25mm：multiple layer welds c）thickness ≤5mm：not mentioned in the standard