BS 6755 Inspection & Test Plan (ITP)
A typical stage-wise ITP / quality plan for valves supplied to BS 6755 — 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 BS 6755 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 BS 6755 (Testing of Valves - Production Pressure Testing and Fire Type Testing Requirements); 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 BS 6755
- Part 1, Leakage Rate A: Zero leakage (bubble-tight) at test pressure - the tightest class, typically required for toxic, hazardous, or zero-leakage applications
- Part 1, Leakage Rate B: Maximum 0.006 cm³/min per mm of nominal bore - applicable for gas and vapour service
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 BS 6755 / 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 hydrostatic test at 1.5× pressure rating (production test on every valve)
- High-pressure closure test at 1.1× pressure rating
- Low-pressure air seat test at 0.6 bar ± 0.1 bar
- Duration per BS 6755 Table 1 (varies by valve size, NPS 1/2" through NPS 60")
- Temperature: ambient (10–40°C) for production tests
Primary hold point — witnessed shell, seat and backseat tests.
6. Fire-type test (qualification)
Hold- Fire test per API 607 / API 6FA with post-fire leakage acceptance
7. Marking, painting & preservation
Review- Nameplate & body marking verification
- Painting/coating DFT check, end protection and preservation
8. Final documentation
Hold- BS 6755 Part 1 test certificate with leakage rate class (A, B, C, or D) stated
- Material test reports (MTRs) per EN 10204 Type 3.1 or 3.2
- Dimensional inspection report per BS 6755 and end-connection standard
- Third-party witness test certificate (if required by specification)
- BS 6755 Part 2 fire test certificate (if fire-safe valves specified)
Final documentation review before release/dispatch.
This is a typical ITP framework populated from BS 6755 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 BS 6755 valves with a full ITP?
We supply BS 6755-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.