Explain the distinction between a company's ASME BPVC stamp (U/S/PP) and its National Board R stamp when a shop claims both and a customer wants to confirm scope
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Search caconnect.asme.org/directory for the ASME-side certificate (U, S, or PP) to confirm original code-construction authorization scope and expiration
Search buscenter.nationalboard.org/MfgRepDir.aspx separately for the National Board R (or NR/VR) stamp, which governs repair/alteration rather than new construction
Confirm the two systems are administered by different organizations (ASME vs. the National Board) even though they are closely linked in practice — a shop can hold one without the other
Match the scope statement on each certificate to the specific work being contracted: new fabrication/construction needs the ASME stamp scope; repair/alteration needs the National Board R stamp scope
If either certificate cannot be located in its respective directory, request the exact certificate number and legal entity name from the shop and retry rather than concluding non-certification from a failed name search alone
Known gotchas
These are two separate certificate directories maintained by two separate organizations — checking only one does not confirm the other, and a shop can be legitimately ASME-stamped for new construction while having no R stamp for repair work at all
Both directories are manual web search interfaces, not machine-readable public APIs, as observed at the time of this check — plan for manual or semi-automated lookups, not bulk programmatic queries
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