A 516 is an ASTM designation for low carbon steel plate suitable for low temperature service. SA 516 is an ASME designation, described on ASME Boiler Code Section II.
In the majority of cases both materials are identical but sometimes there are slight differences. It's always advisable to take a look at the ASME Boiler Code Section II and check whether or not the materials are the same.
In most cases A 516 (or SA 516) is used to make pressure vessels. In these cases the requirements of ASME Boiler Code Section VIII, including those for PWHT, apply.
However, sometimes I've seen A 516 used to make large diameter piping (i.e., above 24 inches in diameter) for refineries and chemical plants. In these cases, ASME/ANSI B 31.3 Code for Pressure Piping is applicable.
If the steel is used for a different application, it's necessary to see whether this application is ruled by some Code or standard. If it is, then that Code of standard must be followed.
As a preliminary opinion, i.e., without having read ASME VIII and B 31.3, I'd say that Dancer's client requirement is reasonable.
Giovanni S. Crisi
Sao Paulo - Brazil
Hello Lawrence,
Thank you for your input.
Further to this issue, do you know what criteria determines the necessity for PWHT with SA515 Gr70 material?