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SA 537 CLASS-1 PWHT Requirements

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GOPIn

GOPIn

Mechanical
Jun 13, 2023
1
dear Sir, what is the minimum thickness required to do pwht for sa 537 cl-1 material

 
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What Code are you asking about?

Since this is the storage tank forum it should be API 650, API 620 or similar. If this is a pressure vessel question it should be posted in another forum.
 
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For an API 650 tank, your shell material is in Group VI.
Per API 650 section 5.7.4 thermal stress relief (PWHT) is required for all flush-type fittings for any shell thickenss and PWHT is required for your tank for all openings over 2" NPS when the tank shell is more than 13mm [1/2"] thick.
 
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