| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. INSULATION MATERIAL SPECIFICATION | |||
| A1 | Insulation material type verified against design specification (FG, MW, EPS, etc.) Acceptance: Material certificates or mill test reports provided; fire rating ≥ Class A or non-combustible; R-value/thermal conductivity verified | Cl. 4.1 — Material type | OK NC NA HOLD |
| A2 | Insulation thickness measured and verified (typically 25, 50, 75, or 100 mm per design) Acceptance: Thickness measured at ≥3 points per 3 m length; ±10% tolerance acceptable; no thin areas < design specification | Cl. 4.2 — Thickness verification | OK NC NA HOLD |
| A3 | Insulation density and workmanship quality verified; no visible crushing, gaps, or voids Acceptance: Insulation compressed < 10% of original thickness; no voids > 100 cm²; surface finish uniform and neat | Cl. 4.3 — Quality of application | OK NC NA HOLD |
| B. DUCT INSULATION APPLICATION | |||
| B1 | Insulation completely covers all external duct surfaces (top, sides, bottom); no bare metal visible Acceptance: Coverage 100% of external surface; joints in insulation lapped ≥50 mm with staggered arrangement; no gaps at corners or bends | Cl. 5.1 — Complete coverage | OK NC NA HOLD |
| B2 | Vapor barrier (if required) intact and continuous; no tears, gaps, or damage Acceptance: Vapor barrier (typically 0.5 mm polyethylene) covers all insulation; sealed at joints with tape; no moisture infiltration | Cl. 5.2 — Vapor barrier integrity | OK NC NA HOLD |
| B3 | Outer protective covering (if specified) installed and secured; no damage or separation from insulation Acceptance: Covering material (aluminum foil, canvas, etc.) covers all surfaces; secured with adhesive or mechanical fasteners every 300 mm | Cl. 5.3 — Protective covering | OK NC NA HOLD |
| C. REFRIGERANT PIPE INSULATION | |||
| C1 | Refrigerant pipes (liquid and suction lines) insulated per design (typically 6-13 mm foam tube) Acceptance: Suction line ≥13 mm, liquid line ≥6 mm insulation thickness; elastomeric foam (Class 1 or 2 per ISO 6029); no bare pipe sections | Cl. 6.1 — Pipe insulation thickness | OK NC NA HOLD |
| C2 | Insulation on pipes continuous with no gaps at joints; end caps sealed to prevent water ingress Acceptance: Pipe insulation overlap ≥50 mm at joints; sealed with adhesive or tape; end caps installed at connection points | Cl. 6.2 — Joint sealing | OK NC NA HOLD |
| C3 | No condensation observed on uninsulated areas; pipe moisture check performed visually Acceptance: Suction line insulation prevents condensation; no water dripping observed; insulation surface dry | Cl. 6.3 — Condensation prevention | OK NC NA HOLD |