PWHT thickness ranges of Carbon steel materials as per ASME B 31.3 latest

[PK M]

Dear Experts,

Please give me the requirements of the PWHT thickness ranges of Carbon steel materials as per ASME B 31.3 Latest ?

thank you.

pkm

[Ramin Kondori]

A major significant change in welding requirements for process piping was brought out by ASME B31.3 (2014), Table 331.1.3 "Exemptions to Mandatory Postweld Heat Treatment" which allowed for:

• all P-No.1 carbon steels,  
• all control Thickness, 
• all weld types,

to be exempted from PWHT if a preheat of 95°C (200°F) is applied prior to welding on any nominal material thickness > 25mm (1in). Note that for materials thickness of below 5 mm (3/16 in), multiple layer welds shall be used; otherwise, this exemption cannot be applied.

But keep in mind that there are a lot of arguments and discussions about this new rule...

Many see it as a bad idea (me included)...

Ramin  Kondori

Sr. QA/QC & Welding Engineer

-----------------------------------------------------------

PG-Dip. in Welding Engineering (IWE  AT  0070)

BSc. in Civil Engineering (IUT)

BGAS Painting Inspector

ASNT Level I&II

                        

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