ASME B31.3 is the code that governs process piping in the United States. For a buyer, it is less a technical curiosity and more a purchase specification: it defines what the fabricator must prove before the spools leave the shop.
What the code requires from the fabricator
Four things matter most in practice: qualified welding procedures (WPS/PQR) to ASME Section IX, qualified welders, material traceability, and documented examination of the welds. Any fabricator claiming B31.3 compliance should be able to show all four before fabrication begins.
Documents to demand with the spools
- Welding procedure specifications and qualification records (WPS/PQR).
- Welder performance qualifications (WPQ) current for the process used.
- Material test reports (MTR) traceable to heat numbers.
- Weld maps with welder identification per joint.
- Non-destructive examination reports per the specified extent.
- Hydrostatic test records and dimensional reports.
How it shows up on the shop floor
A shop working to B31.3 keeps weld maps at the bay, marks heat numbers on cut material, and does not ship a spool whose test record cannot be produced on demand. When you audit a supplier, ask to see the weld map of a job currently in progress rather than a closed project file.
Where buyers overpay
Specifying a higher examination extent than the service requires. B31.3 allows the owner to set examination requirements by category; matching them to fluid service and design conditions controls cost without compromising safety.
Daniel Steels Manufacturing fabricates process piping to ASME B31.3 in Houston, Texas, and delivers the full documentation package with every spool. Request a quote or call 346-232-2659.