EN 558 Inspection & Test Plan (ITP)
A typical stage-wise ITP / quality plan for valves supplied to EN 558 — 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 EN 558 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 EN 558 (EN 558 - Face-to-Face and Centre-to-Face Dimensions of Metal Valves for Use in Flanged Pipe Systems); 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 EN 558
- Series 1: short-pattern valves (butterfly wafer and lug, check valves)
- Series 14: standard face-to-face for gate and globe valves to PN 16
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 EN 558 / 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- Dimensional inspection per EN 558 table at time of manufacture
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- Dimensional inspection report confirming EN 558 series compliance
Final documentation review before release/dispatch.
This is a typical ITP framework populated from EN 558 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 EN 558 valves with a full ITP?
We supply EN 558-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.