What testing protocols are required for control valve acceptance?

Valve acceptance testing protocols: Factory Acceptance Test (FAT) - hydrostatic shell test (1.5x rating), seat leakage test (per ANSI Class), functional test (stroke time, positioning accuracy, fail action), material certificates verification, dimensional check, and positioner calibration. Additional for critical valves: flow capacity test, noise test, and dynamic response test. Witness testing: attend FAT for critical/high-value valves. Site Acceptance Test (SAT): verify installation, stroke check, calibration, fail position, and integrate with DCS. Document all results with as-built data. Ongoing: periodic proof tests for SIS valves. Standards: API 598, ASME B16.34, ISA-75.02 for testing requirements.