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Heat treatment requirements of piping in B31.3-2004

Heat treatment requirements of piping in B31.3-2004

Heat treatment requirements of piping in B31.3-2004

(OP)
For B31.3-2004 Process Piping, in the column named "Metal Temperature Range"" of "Table 331.1.1 Requirements for Heat Treatment" , "None" means that the material doesn't require heat treament? Thanks.

RE: Heat treatment requirements of piping in B31.3-2004

(OP)
If piping meets "Base Metal Group" and "Nominal Wall Thickness" and "Specified Min. Tensile Strength, Base Metal", does it mean that heat treatment shoud be required in accordance with "Metal Temperature Range" and "Holding Time" and "Brinell Hardness,Max."?

RE: Heat treatment requirements of piping in B31.3-2004

etsen,
Post 1 = None means no heat treatment is required.
Post 2 = If there is specified metal temperature, holding time and a maximum hardness for a particular line in the Table 331.1.1, that means the material of the specified thickness in that line must be Post Weld Heat Treated (I assume that the formed piping item stress relief is taken care of by the forming supplier, you only check the certificate for compliance). Please note also the various notes applicable to your line in the Table.
Hope this helps,
cheers,
gr2vessels

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