ASME B16.34 Inspection & Test Plan (ITP)
A typical stage-wise ITP / quality plan for valves supplied to ASME B16.34 — 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 ASME B16.34 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 ASME B16.34 (Valves - Flanged, Threaded, and Welding End); 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 ASME B16.34
- Minimum wall thickness of body and bonnet based on pressure class and material group
- Pressure-temperature (P-T) rating tables: every combination of class and material has a defined MAWP at each temperature
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 ASME B16.34 / 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/body hydrostatic test: 1.5× rated pressure at 20°C
- Seat/closure test: 1.1× rated pressure
- Backseat test (where applicable)
- Shell test duration proportional to NPS
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- ASME B16.34 conformance statement on valve data sheet
- Material Test Reports (MTRs) for pressure-containing parts
- Hydrostatic test certificate
- Pressure-temperature rating certificate or data sheet referencing B16.34 tables
Final documentation review before release/dispatch.
This is a typical ITP framework populated from ASME B16.34 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.
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Need ASME B16.34 valves with a full ITP?
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