Pre-heat temps for B31.3
Pre-heat temps for B31.3
(OP)
What is the applicable code and requirements for pipe temperatures prior to welding for B31.3 and B31.1?
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RE: Pre-heat temps for B31.3
RE: Pre-heat temps for B31.3
Just a correction to your post. ASME B31.1 is the Power Piping Code and ASME B31.3 is the Process Piping Code.ASME B31.3 is not Power Piping.
RE: Pre-heat temps for B31.3
RE: Pre-heat temps for B31.3
The WPS may have only a minimum preheat temperature used to qualify the procedure. The preheat actually specified could be higher, and this is permissible (elevating preheat) by Section IX without having to re-qualify the WPS.
RE: Pre-heat temps for B31.3
I have always understood that this temperature was determined based on experimental tests long ago rather than any type of analytical method.
Pre-heat is not normally required for Grade B pipe and fittings.
RE: Pre-heat temps for B31.3
Preheat requirements are provided in B31.3 (see Table 330.1.1), and see 131.4 Preheat Temperature section in B31.1.