| S.No. | Checkpoint | IS Requirement | Status |
|---|---|---|---|
| A. THREADED JOINT INSPECTION (GI/MS PIPES) | |||
| A1 | Threads are clean, dry, and free from burrs; thread profile intact and undamaged Acceptance: Thread visible with no chipping, tape residue removed, no corrosion visible | Cl. 10.1 — Thread condition | OK NC NA HOLD |
| A2 | PTFE tape applied minimum 3-4 wraps on male threads (clockwise direction); tape aligned with thread pitch Acceptance: PTFE tape wraps ≥3, wraps taut and aligned, no tape spillage into pipe interior | Cl. 10.2 — Sealant application | OK NC NA HOLD |
| A3 | Joint is tightened adequately; wrench mark on nut visible, joint does not turn by hand Acceptance: Joint fully tightened, no movement when pulling, wrench used for final tightening (>1/2 turn) | Cl. 10.3 — Tightness verification | OK NC NA HOLD |
| A4 | Joint does not seep water during low-pressure test; no water droplet at union interface Acceptance: Zero seepage during 1 bar test at joint, dry interface after 5 minutes dwell time | Cl. 10.4 — Water-tightness | OK NC NA HOLD |
| B. SOLVENT-WELDED JOINTS (UPVC PIPES) | |||
| B1 | Joint surfaces cleaned with cleaner (acetone/MEK) before solvent application; surfaces must be dry Acceptance: Cleaning visible, surfaces dry and debris-free, no oil/dust residue on joint area | Cl. 10.5 — Surface preparation | OK NC NA HOLD |
| B2 | Solvent cement applied evenly to both pipe and fitting; application time within manufacturer window Acceptance: Solvent applied quickly after cleaning, joint made within 60 seconds, assembly held for ≥30 seconds | Cl. 10.6 — Solvent application | OK NC NA HOLD |
| B3 | Curing time observed per temperature: minimum 2 hours at 20°C before pressure test (longer if cooler) Acceptance: Cure time documented, temperature recorded, no testing until minimum cure time elapsed, visual cure ring present | Cl. 10.7 — Cure time | OK NC NA HOLD |
| B4 | Joint is strong and does not crack; full strength achieved as per solvent manufacturer data Acceptance: Pressure test ≥1 bar applied, no failure or leakage, joint color uniform indicating full cure | Cl. 10.8 — Joint strength | OK NC NA HOLD |
| C. VALVE INSTALLATION & CONNECTIONS | |||
| C1 | Valve body is installed in correct orientation (arrow marking on body points downstream if present) Acceptance: Flow direction arrow visible, valve installed per arrow, handwheel/lever accessible for operation | Cl. 11.1 — Valve orientation | OK NC NA HOLD |
| C2 | Valve connections are properly made using same jointing method as pipe (threaded/solvent/compression) Acceptance: Connection method matches pipe type, PTFE tape applied for threads, solvent properly cured, no leaks | Cl. 11.2 — Connection method | OK NC NA HOLD |
| C3 | Valve is accessible; handwheel/lever is not obstructed and can be operated through 90° minimum Acceptance: Valve can be operated freely, no pipes/obstructions blocking handwheel, operational test passed | Cl. 11.3 — Access & operability | OK NC NA HOLD |
| C4 | Valve body and connections are tested for leakage; zero seepage at threads or body welds Acceptance: Valve tested at design pressure, dry after 5-minute dwell, no moisture at any joint | Cl. 11.4 — Leak test | OK NC NA HOLD |