What is the acceptance test for valves?
What is the acceptance test for valves?
Valve acceptance testing (FAT, SAT, hydrostatic, seat leakage, functional) – what to test, what the standards are for passing, and how to keep records and have witnesses.
“Acceptance testing” for valves includes the inspections and pressure/functional tests that are done before the valve leaves the factory (Factory Acceptance Test, or FAT) and again when it is put in place (Site Acceptance Test, or SAT). Common FAT testing include checking the dimensions, torque, packing, and stem leaks, as well as the body shell test and the seat leakage test (for closure/seat tightness). API 598 is a common standard for checking and testing acceptance levels, such as seat leakage classes, test pressures, and allowable leakage rates. Project owners often add their own Product Acceptance Test (PAT) procedures (PETRONAS, major EPCs) that set pass/fail criteria, witness requirements, test fluids (water, air, or nitrogen), and documentation (FAT test sheet, material traceability, calibration certificates). A typical flow goes like this: (1) check the material and marking; (2) do a hydrostatic shell test (usually at 1.5 times the design pressure or according to spec); (3) do a seat leakage test at the required differential pressure; (4) do functional stroke/actuator tests; (5) check the preservation and packing; and (6) sign off with a witness and a supply certificate. For social and forum posts, focus on practical advice: always ask for the FAT protocol before production, double-check the test medium and temperature, and ask for observed results and signed test sheets. This will connect with both the procurement and field teams.
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