| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. PRESSURE LEAKAGE TEST | |||
| A1 | Duct system pressurized to design test pressure (typically 250 or 500 Pa); leakage measured with calibrated flow meter Acceptance: Test pressure maintained for minimum 10 minutes; leakage flow measured in m³/s; acceptable: ≤10% of design flow | Cl. 4.1 — Leakage measurement | OK NC NA HOLD |
| A2 | Visual inspection during pressurization: detection of leakage points using smoke test or soapy water method Acceptance: Smoke applied to suspected joints; visible plumes indicate leakage; all leak locations documented with location and estimated flow | Cl. 4.2 — Leak location identification | OK NC NA HOLD |
| A3 | Measured leakage rate converted to equivalent leakage percentage (%Q design) Acceptance: Leakage % = (Measured leakage / Design flow) × 100; acceptable ≤10% (%Q); typical tight duct systems 3-5% | Cl. 4.3 — Leakage percentage calculation | OK NC NA HOLD |
| B. ACCEPTANCE CRITERIA AND CORRECTIVE ACTION | |||
| B1 | Leakage test result: PASS if ≤10% of design flow; FAIL if > 10% Acceptance: PASS: Duct system acceptable for operation; FAIL: Identify and seal leakage points; re-test required | Cl. 5.1 — Acceptance determination | OK NC NA HOLD |
| B2 | Corrective action: All identified leakage points sealed with approved sealant (mastic or high-quality tape) Acceptance: Sealant applied to all leak locations; joint sealing re-checked; re-test after 24-hour cure | Cl. 5.2 — Remediation | OK NC NA HOLD |