| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. MTC IDENTIFICATION AND AUTHENTICITY | |||
| A1 | Verify MTC on manufacturer letterhead with unique certificate number and signatory Acceptance: Letterhead, cert no., date, authorized signature, seal present | Cl. 11 — Certification | OK NC NA HOLD |
| A2 | Verify BIS ISI mark and CM/L licence number printed on pipe and MTC Acceptance: ISI mark rolled/printed on pipe at regular intervals; CM/L valid and current | Cl. 10 — BIS marking | OK NC NA HOLD |
| A3 | Verify pipe marking: manufacturer, IS number, class/SDR, size, date, batch Acceptance: All statutory information legibly printed/embossed on every pipe length | Cl. 10 — Pipe marking | OK NC NA HOLD |
| B. DIMENSIONAL VERIFICATION | |||
| B1 | Verify outside diameter (OD), wall thickness, and length tolerances reported on MTC Acceptance: MS: OD ±1%, wall -8%/+unlimited; PVC: OD +0.3 mm/-0; wall per class; length ±0.2% | Table 1 — Dimensions | OK NC NA HOLD |
| B2 | Verify ovality and straightness on MTC and physically Acceptance: Ovality ≤ 1.5% of OD for PVC/HDPE; pipe straight with deviation ≤ 0.5% of length | Cl. 7 — Form | OK NC NA HOLD |
| C. MECHANICAL / HYDROSTATIC PROPERTIES | |||
| C1 | For MS pipes — verify tensile strength, yield, elongation, bend test on MTC Acceptance: Tensile ≥ 320 MPa; elongation ≥ 20%; bend test without crack at 6×OD mandrel | Table 2 — MS mechanical | OK NC NA HOLD |
| C2 | For plastic pipes — verify hydrostatic pressure test (short-term, 1000 hr) reported on MTC Acceptance: PVC: no failure at hydro test per class; HDPE: pass at 20°C / 80°C regimes; CPVC 82°C 1000 hr | Cl. 8 — Hydrostatic | OK NC NA HOLD |
| C3 | For MS pipes — verify galvanizing (if GI) coating mass and adhesion Acceptance: Zinc coating ≥ 400 g/m² (heavy); uniform coating per IS 4736; 4-dip preece test pass | Cl. 9 — Zinc coating | OK NC NA HOLD |
| C4 | For PVC/CPVC — verify Vicat softening temperature and reversion Acceptance: VST: PVC ≥ 80°C; CPVC ≥ 110°C; reversion ≤ 5% at 150°C (PVC) / 150°C 1 hr | Cl. 6 — Thermal | OK NC NA HOLD |
| C5 | For HDPE — verify density, MFI (melt flow index), and OIT oxidation induction time Acceptance: PE80/PE100 density 0.93-0.96 g/cc; MFI in range; OIT ≥ 20 min at 200°C | Cl. 6 — HDPE grade | OK NC NA HOLD |