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ASME B31.3 PWHT min thickness for Carbon steel

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engr2GW

engr2GW

Petroleum
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Nov 7, 2010
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Hello, The min thickness for PWHT to be required used to be 3/4 inches. I only have the 2012 version of the document. Has it increased? I saw a document where 0.98 inches was required as minimum, but there was no reference. Has it changed from 0.75 inches?

Thank you in advance

As much as possible, do it right the first time...
 
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For PNo 1 no minimum thickness provided 200 F preheat for T > 1" as I recall. Pretty much unchanged for other P Nos.
 
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You must use proper engineering judgement regarding the operating parameters as to whether you should PWHT.
 
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Thank you for the response and advise. Much appreciated.

As much as possible, do it right the first time...
 
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It is greater than 19 mm (3/4 inch) still.

DHURJATI SEN
Kolkata, India


 
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Read Table 331.1.3 in the 2020 / 2022 editions and you will have your answer.
 
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