Pipe Rejection Criteria — buyer's pre-acceptance checklist
Pre-acceptance rejection checklist for steel pipe buyers — OD, wall thickness, surface defects, threading, and MTC verification checks before dispatch approval.
Common rejection criteria include: Wall thickness variance (under tolerance), surface laminations/pits visible after blasting, wrong end finish (bevel/chamfer), and wrong material grade certification.
What surface and visual defects lead to pipe rejection?
Excessive pitting, seams, or laminations usually lead to rejection. A simple "wash" or paint coat often hides surface defects that only appear after blasting.
Check for: Seams (spiral), Laminations (internal), Pits.
Use: DPE (Magnetic Particle) or Ultrasonic testing for detection.
- Lamination: Internal rust/seam
- Pitting: Rust spots
- Seam: Weld line imperfection
Which dimensional tolerance violations cause rejection?
Wall thickness ("WT") under the minimum P.O. tolerance is the #1 cause of rejection. Also check Ovality (out-of-roundness) for critical line-pipe.
WT Tolerance: usually -0% to +10% for seamless.
OD Tolerance: +/- 1% for ID pipes.
- Wall Thickness: -0 / +10%
- Ovality: < 2%
- Length: -0 / +10mm
| Visual | No seaml-lamination-pits |
|---|---|
| WT Tolerance | -0% to +10% (standard) |
| OD Tolerance | +/- 1% |
| Length | Random or Fixed |
- EN 10204:2004 — Metallic products — Types of inspection documents (CEN)
- IS 228:2004 — Methods for chemical analysis of steel (BIS)
- IS 2062:2011 — Hot rolled medium and high tensile structural steel (BIS)
- Indian Boiler Regulations 1950 — Chapter VII (Directorate of Boiler)
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