Pipe Fitting Goods Receipt Inspection: A 10-Point Checklist for Procurement Engineers
Receiving inspection is the last line of defence before a pipe fitting is installed in a system. Non-conformances discovered at goods receipt — wrong grade, missing certificate, incorrect dimensions — are correctable at low cost. The same non-conformance discovered after installation requires costly cut-out and replacement, with potential system downtime. A structured goods receipt inspection takes less than 20 minutes per batch and catches the most common supplier errors before they become site problems.
10-Point Goods Receipt Checklist
- Certificate type matches PO. PO states 3.1 → the certificate must be countersigned by an AIR (Authorised Inspection Representative). A 2.2 certificate (manufacturer's declaration only) is not a 3.1. Check the signature block — "Authorised Inspection Representative" must appear, not just "Quality Manager."
- Heat number on the fitting matches the certificate. Every fitting must be marked with its heat number (or a batch trace where heats are grouped). Verify at least 10% of fittings by spot-check: find the heat number stamp on the fitting and confirm it appears on the certificate. If the heat numbers don't match, the certificate is for a different batch.
- Grade marking matches the PO grade. WP316L ≠ WP316. WP91 ≠ WP9. P11 Cl.1 ≠ P11 Cl.3. Read the heat chemistry on the certificate and verify the key elements: Cr, Mo, Ni, C. A certificate where carbon reads 0.045% for a "316L" order is non-conforming — 316L requires C ≤0.030%.
- All mechanical properties are present and within limits. The certificate must show Rm (tensile), Rp0.2 (proof strength), and A% (elongation). Values must meet the grade minimum. Missing mechanical properties — even if chemistry is correct — make the certificate incomplete.
- Heat treatment condition stated. For alloy steel (P11, P22, P91): "normalised and tempered" must be stated. For austenitic stainless: "solution annealed." For duplex: "solution annealed and quenched." An A234 WP91 certificate that states only "heat treated" without naming the condition is non-conforming.
- Fitting markings are legible and complete. ASME B16.9 requires: manufacturer name/logo, material grade, NPS size, schedule, and heat/lot number. Check that none of these are missing or illegible. Illegible heat numbers break traceability.
- Dimensions spot-check. Measure OD at fitting ends (verify against ASME B16.9 Table 2 or EN 10253 Table A.1) and centre-to-end dimension on elbows and tees. Check one fitting per size per batch with a tape and caliper — catches bent, oversized, or wrong-size fittings before installation.
- Visual inspection for surface defects. Look for laps, seams, cracks, pits, and excessive grinding marks. A lap or seam running longitudinally is a manufacturing defect. Excessive grinding that has reduced wall thickness below minimum is a rejection ground. Minor surface marks from handling are acceptable.
- PMI verification for alloy fittings. For stainless, duplex, nickel alloy, or CrMo fittings: perform PMI (XRF) on at least 10% of fittings per batch. Compare Cr, Mo, Ni, Cu readings against the grade specification. PMI cannot replace chemistry testing but catches grade mix-ups (the most common alloy fraud).
- Quantity and size count matches delivery note and PO. Count all items. Check NPS, schedule, and fitting type (elbow angle LR/SR, equal/reducing tee, concentric/eccentric reducer) against the PO line by line. Short deliveries and substitutions (SR supplied as LR, SCH 40 supplied as SCH 80) must be flagged before the batch is released to the job.
When to Reject and How
If any point fails: quarantine the batch (segregate, tag "HOLD — GRI FAIL"), document the non-conformance with photos, and raise an NCR (Non-Conformance Report) against the supplier. Do not release any fitting from a quarantined batch until the NCR is resolved. Common resolutions: supplier resubmits correct certificates; supplier performs PMI on full batch and re-marks; fittings returned and replaced. Do not accept a verbal assurance in place of a corrected document.