MSS SP-75 Inspection & Test Plan (ITP)
A typical stage-wise ITP / quality plan for valves supplied to MSS SP-75 — inspection activities, tests, acceptance references and verifying documents, with recommended hold, witness and review points for QC and third-party inspection.
What is the ITP for MSS SP-75 valves?
An Inspection & Test Plan (ITP) sequences every check between raw material and dispatch, and assigns each an inspection level — Review (document check), Witness (inspector may attend), or Hold (work stops until released). The plan below is a typical ITP for valves built to MSS SP-75 (Specification for High-Test Wrought Butt-Welding Fittings); the tests and documents are drawn directly from the standard's requirements. Use it to structure your QAP or coordinate third-party inspection.
1. Documentation & design review
Review- Approval of drawings, datasheets and QAP against MSS SP-75
- Yield strength: WPHY grades - WPHY 42, WPHY 46, WPHY 52, WPHY 56, WPHY 60, WPHY 65, WPHY 70 - matched to pipeline steel grades
- Wall thickness: compatible with API 5L pipe schedule (Schedule Std, XS, XXS and specific pipeline wall thicknesses)
2. Raw material verification
Review- Material Test Reports (MTRs) review per EN 10204 3.1/3.2
- Positive Material Identification (PMI) of pressure-containing parts
3. Dimensional inspection
Witness- Dimensional check per MSS SP-75 / ASME B16.34 / applicable face-to-face
- Wall thickness verification
4. NDE (as applicable)
Witness- Visual, and RT/UT/MPI/DPT of castings/welds per specification
5. Pressure & performance testing
Hold- Hydrostatic test of fitting body per ASME B16.9 (for shaped fittings) or per manufacturer's procedure
- Radiographic examination of girth welds in fittings
- Impact testing per ASTM A420 for low-temperature fittings (Charpy V-notch at -46°C for WPL6)
- Hardness testing for sour-service NACE MR0175 compliance where applicable
Primary hold point — witnessed shell, seat and backseat tests.
6. Marking, painting & preservation
Review- Nameplate & body marking verification
- Painting/coating DFT check, end protection and preservation
7. Final documentation
Hold- Material Test Reports (MTRs) per EN 10204 3.1 or ASTM
- NDE (radiography) reports for welded fittings
- Impact test results for low-temperature grades (WPL6)
- Dimensional inspection certification
Final documentation review before release/dispatch.
This is a typical ITP framework populated from MSS SP-75 requirements, for reference. The actual hold/witness/review split is agreed per project between purchaser, manufacturer and the third-party inspection agency in the approved QAP. Confirm project-specific requirements before use.
Need MSS SP-75 valves with a full ITP?
We supply MSS SP-75-compliant valves with a project-specific ITP, in-house QC and third-party inspection (SGS, BV, TUV, DNV) coordination — hold and witness points accommodated. Get a 24-hour quote.