API 600 Inspection & Test Plan (ITP)
A typical stage-wise ITP / quality plan for valves supplied to API 600 — 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 600 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 600 (Specification for Steel Gate Valves - Flanged and Butt-Welding Ends, Bolted and Pressure-Seal Bonnets); 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 600
- Minimum wall thickness calculated per ASME B16.34 plus corrosion allowance
- 14 standardised trim numbers defining body seat, gate face, and stem materials
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 600 / 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 for minimum 60 seconds
- Seat leakage test: 1.1× rated pressure per API 598 Class VI
- Back seat test: 1.1× rated pressure with packing loose
- Dimensional inspection per API 600 Table 1 face-to-face dimensions
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 (MTR) per EN 10204 3.1
- Hydrostatic shell and seat test certificate
- Dimensional inspection report
- Trim material confirmation
Final documentation review before release/dispatch.
This is a typical ITP framework populated from API 600 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 600 valves with a full ITP?
We supply API 600-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.