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sw wall thickness

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Where can I find minimum wall tickness for socket welding classe 300 size 3'' and 4''?
 
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I have what I want in b16.34a-1998 table4, but only covers sizes up to 2 1/2'' and I need size 3'' and 4''
 
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ANSI B16.11 has dimensions for SWE 3" & 4" including minimum wall thicknesses.
 
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General industry practice is to limit socketweld piping to 2" NPS. Piping 3" NPS and larger is usually buttwelded.
 
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Murio,
The reply by dfteng is right. However, there is Class 3000 instead of 300.
 
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in our specifications we don't provide schedule, however we mention the dimensions as per ANSI B 16.11, but the pressure clas mentioned is 3000#. i will request you to check ur pressure class.
 
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