QUALITY ASSURANCE PLAN
Lined Valve Standard
Quality Assurance Plan for Lined Ball, Plug & Butterfly Valves — covering raw material, in-process, finished product, and final inspection stages.
About This QAP
Our complete Quality Assurance & Control procedure for Lined Ball, Plug, and Butterfly Valves — from raw material verification through hydrostatic and spark testing, dimension control, and final painting inspection. All UNP valves are 100% tested before dispatch with full traceability via Final Inspection Reports and Material Test Certificates.
Quality Assurance Plan — Lined Ball, Plug & Butterfly Valve
| SR.NO | ITEMS | PARAMETER | TYPE OF CHECK | QUANTUM | REFERENCE DOC. & ACCEPTANCE NORMS | DOCUMENT RECORD | UNP SCOPE | TPIA / CUSTOMER | |||
|---|---|---|---|---|---|---|---|---|---|---|---|
| P | W | R | W | R | |||||||
| 1. Raw Material — (A) Non-Metallic Parts, (B) Metallic Parts | |||||||||||
| A | Lining Material | Intactness | Visual | 100% | P.O. Specification & Product Data Sheets | Supplier MTC / COC | ✗ | ✗ | ✓ | ✗ | ✓ |
| Grade Confirmation | Visual | 100% | Product Data Sheets | Supplier MTC / COC | ✗ | ✗ | ✓ | ✗ | ✓ | ||
| Physical Verification | Visual | 100% | Product Data Sheets | Supplier MTC / COC | ✗ | ✗ | ✓ | ✗ | ✓ | ||
| B | Valve Body, Side-Piece, Ball (Insert), Plug (Insert) & Disc (Insert) | Chemical & Mechanical Properties per approved GAD / QAP / PO Specification | Chemical & Mechanical Property | 1 Sample / Size / Heat or per PO | Manufacturer / Supplier TC or NABL Lab TC | EN-10204 Type 3.1 TC | ✗ | ✗ | ✓ | ✗ | ✓ |
| 2. In-Process Inspection | |||||||||||
| A | Valve Body, Side-Piece, Plug, Ball (Insert) | Porosity Check | Spark Test (NA for Antistatic) | 100% | UNP Spark Test Procedure | Final Insp. Report | ✓ | ✓ | ✓ | ✗ | ✗ |
| Physical Verification | Visual | 100% | UNP Mfg. Drawings | Final Insp. Report | ✓ | ✓ | ✓ | ✗ | ✗ | ||
| Dimensions | Measurement | 100% | UNP Mfg. Drawings | UNP Inward IR | ✓ | ✓ | ✓ | ✗ | ✗ | ||
| 3. Finished Products — CS + PFA Lined Ball / Plug / Butterfly Valves | |||||||||||
| 3.1 | Lined Ball / Plug / Butterfly Valves | Leakage Test (Shell / Body) | Hydrostatic Test | 100% | UNP Hydro Test Procedure or Approved GAD | Final Insp. Report | ✓ | ✓ | ✓ | ✓ (10%) | ✓ |
| Leakage Test (Seat) — Hydrostatic | Hydrostatic Test | 100% | UNP Hydro Test Procedure or Approved GAD | Final Insp. Report | ✓ | ✓ | ✓ | ✓ (10%) | ✓ | ||
| Leakage Test (Seat) — Pneumatic | Pneumatic Test Pressure | 100% | UNP Pneumatic Test Procedure | Final Insp. Report | ✓ | ✓ | ✓ | ✓ (10%) | ✓ | ||
| Lining Intactness | Spark Test (NA for Antistatic) @20 KVDC | 100% | UNP Spark Test Procedure or Approved GAD | Final Insp. Report | ✓ | ✓ | ✓ | ✓ (10%) | ✓ | ||
| Lining Thickness | Thickness Check | 100% | 3.2 mm Minimum | Final Insp. Report | ✓ | ✓ | ✓ | ✓ (10%) | ✓ | ||
| Dimension Measurement | Dimension Inspection | 100% | Approved GAD / UNP As-Built Drawing | Final Insp. Report | ✓ | ✓ | ✓ | ✓ (10%) | ✓ | ||
| Workmanship | Visual | 100% | UNP Standard | Final Insp. Report | ✓ | ✓ | ✓ | ✓ (10%) | ✓ | ||
| 4. Final Inspection — Painting | |||||||||||
| 4.1 | Lined Valve | DFT, Final Shade, Visual | DFT & Visual Inspection | 100% | UNP Painting Procedure / Customer PO Spec / Approved Drawing / Data Sheet | IR | ✓ | ✓ | ✓ | ✗ | ✗ |
Legend
P
PerformUNP Action
W
WitnessObserve Test
R
ReviewDocument Check
Notes
Customer & Inspection Notes
- The above QAP is our internal procedure of Quality Assurance & Control.
- We provide our Final Inspection Report & MTC or COC to Customers.
- Based on Inspection Report we allow our customer to check the following:
- Physical Verification of Valves & Quantity Check
- Witnessing a leakage Test (Hydro Test) as per our Standard Test Procedure & pressure rating confirmed per QAP Scope
- Dimension Check of final assembly of Valve as per our standard or as-built drawings
QUALITY ASSURED
Need a Custom QAP for Your Project?
We’ll review your PO specifications and provide a project-specific Quality Assurance Plan tailored to your TPIA scope.