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QW-403 18

QW-403.18 outlines the regulations regarding changes from one P-Number to another or to a base metal not listed in Table QW/QB-422, with specific exceptions noted in QW-423 and QW-420. It also addresses changes in the P-Number or A-Number of tubesheet cladding material during tube-to-tubesheet welding. Compliance with these guidelines is essential for proper welding procedures.

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Charles Jacob
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78 views1 page

QW-403 18

QW-403.18 outlines the regulations regarding changes from one P-Number to another or to a base metal not listed in Table QW/QB-422, with specific exceptions noted in QW-423 and QW-420. It also addresses changes in the P-Number or A-Number of tubesheet cladding material during tube-to-tubesheet welding. Compliance with these guidelines is essential for proper welding procedures.

Uploaded by

Charles Jacob
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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QW-403.

18

QW-403.18 A change from one P‐Number to any other P‐Number or to a base metal not listed in Table
QW/QB-422, except as permitted in QW-423, and in QW-420. For tube-to-tubesheet welding: a change in
the P-Number or A-Number of the tubesheet cladding material (if the cladding material is part of the
weld).

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