API 6D Inspection & Test Plan (ITP)
A typical stage-wise ITP / quality plan for valves supplied to API 6D — 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 API 6D 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 API 6D (Specification for Pipeline and Piping Valves); 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 API 6D
- Body and bonnet wall thickness per pressure class and temperature
- Body cavity relief (BCR) provision for thermal expansion of trapped fluid
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 API 6D / 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- Shell test: 1.5× rated pressure, 15 minutes minimum, zero leakage
- Seat leakage test: 1.1× rated pressure, per API 598 leak class
- Back seat test (if applicable): 1.1× rated pressure
- Anti-static device test: <10 ohm resistance
- Torque measurement at maximum differential pressure
- Hydrostatic test certificate required for all valves
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- API 6D monogram licence certificate
- Material Test Reports (MTRs) per EN 10204 3.1 or 3.2
- Dimensional inspection report (DI report)
- Hydrostatic test certificate (per API 598 / API 6D)
- Anti-static test record
- Functional operation test record
- Positive Material Identification (PMI) report
Final documentation review before release/dispatch.
This is a typical ITP framework populated from API 6D 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.
Connected Engineering
Need API 6D valves with a full ITP?
We supply API 6D-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.