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Valve Pressure Test Witnessing (API 598 / API 6D / EN 12266 / ISO 5208)
We witness the factory’s pressure tests to the standard and edition named in your purchase order, record pressures, hold times and leakage, and film the holds where the factory permits.
Standards we witness to
Test pressures, media, durations and leakage criteria are taken from the standard in your PO, not from a generic checklist:
- API 598 — valve inspection and testing (common for gate, globe, check and ball valves)
- API 6D — pipeline and piping valves
- EN 12266-1 — industrial valves, pressure tests (European buyers)
- ISO 5208 — industrial valves, pressure testing of metallic valves
- Your own specification or ITP, where it is stricter
“API 598” here is the name of a public test standard. We do not claim API certification or an API monogram.
What we witness and record
- Shell test (hydrostatic) — body and bonnet, no visible leakage
- Backseat test, where specified
- High-pressure closure (seat) test, both sides where applicable
- Low-pressure gas closure test, where required
- Test gauge ID, range and calibration date; water chloride content for stainless valves if specified
- Serial numbers of the valves witnessed, actual pressures and hold times, leakage observed
How it works on site
- The factory performs the tests on its own test bench; we witness, measure hold times and record results
- Witness quantity follows your ITP — for example 100% or a sample, while the factory tests 100%
- Pressure holds are recorded on video where the factory permits
- Any leak, gauge problem or short hold is reported as found — we do not “re-test until it passes” without recording it
Booking and price
Pressure test witnessing can be added to a pre-shipment inspection (+ USD 60–100 per day, depending on valve count and hold times) or booked on its own (half-day minimum, USD 150–180). See pricing.