Suppose my pipe thickness is 30mm and coupling is attached over the pipe . My question is that pipe to coupling joint requires PWHT as par ASME B 31.1.If PWHT required then why???
Your question is not clearly detail of material, WPS and service application.
- If WPS required WPS, this joint also required PWHT
- If vessel design with PWTH, yes you also follow.
Another point, the CS seems PWHT applied.
Material is CS. It is not a vessel.
I have confusion that i have two WPS, with PWHT and without PWHT.Thickness range-1.5mm to 25mm without PWHT and second WPS having thickness range-5mm to 200mm with PWHT.code of construction ASME B31.1. Then, how will i select the WPS .Which thickness is to be considered for PWHT either pipe or coupling.
Please specific material grouping?
CS material P no1 to Pno 1
Please check in the project specification and ASME B31.1 2018 Table 132.2-1 - Exemptions to mandatory PWHT.