| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. TEST METHODOLOGY | |||
| A1 | Test standard compliance (ISO 9967 or equivalent per IS 14333) Acceptance: Ring stiffness test per ISO 9967; test rig calibrated; procedure documented | Standardized test procedure | OK NC NA HOLD |
| A2 | Sample preparation (Pipe segments 300-500 mm cut perpendicular to axis) Acceptance: Samples cut square; length 300-500 mm; minimum 3 samples per batch | Proper sample dimensions | OK NC NA HOLD |
| A3 | Test apparatus calibration (Load frame, displacement transducer) Acceptance: Load cell calibrated ±1% accuracy; displacement transducer ±0.1 mm; certificates current | Accurate measurement equipment | OK NC NA HOLD |
| A4 | Test temperature control (23±2°C environment) Acceptance: Laboratory maintained at 23±2°C; humidity 45-55%; recorded during test | Standardized testing conditions | OK NC NA HOLD |
| B. TEST EXECUTION & MEASUREMENT | |||
| B1 | Loading procedure (Diametral load applied uniformly at constant rate) Acceptance: Load rate 5 mm/min deflection; load increased until 10% diameter reduction achieved | Controlled loading | OK NC NA HOLD |
| B2 | Displacement measurement (Vertical & horizontal diameter reduction recorded) Acceptance: Deflection measured continuously; recorded at regular intervals (e.g., 2%, 5%, 10%) | Monitor deformation | OK NC NA HOLD |
| B3 | Load data collection (Force recorded at each deflection level) Acceptance: Load and deflection data paired; used to calculate ring stiffness | Establish load-deflection curve | OK NC NA HOLD |
| B4 | Test duration and completion (Until 10% diameter reduction or pipe fracture) Acceptance: Test stops at 10% deflection or fracture (whichever first); results recorded | Define endpoint | OK NC NA HOLD |
| C. CALCULATIONS & ANALYSIS | |||
| C1 | Ring stiffness calculation (Load at specific deflection level used) Acceptance: Ring stiffness (kN/m²) = Load (kN) / (Relative deflection × Pipe length) | Quantify structural rigidity | OK NC NA HOLD |
| C2 | Average ring stiffness from multiple samples Acceptance: Average calculated from all samples; variation ≤20% acceptable | Summary metric | OK NC NA HOLD |
| C3 | Comparison with specification requirement Acceptance: Average ring stiffness ≥ minimum specification value per IS 14333 Table | Verify compliance | OK NC NA HOLD |
| C4 | Load-deflection curve generation Acceptance: Graph plotted; shows linear response up to failure; curves analyzed for anomalies | Visual analysis of structural response | OK NC NA HOLD |