Performance Verification Testing of Valves and Components 

For more than 35 years, Southwest Research Institute® (SwRI®) has provided expertise and state-of-the-art facilities for testing and evaluating mechanical and environmental effects on oil industry equipment.

SwRI recently completed the design and installation of a unique computer-controlled, fully automated valve test facility to evaluate production gate valves as recommended in API Specification 6A, Appendix F, PR2 level. The facility can accommodate up to 9-inch, 15,000-psi valves and actuators (and test fixtures). Fixture testing on stem and bonnet seals can also be performed under API-6A. 

Test components are installed in a hydraulic loop with high-pressure, pneumatically operated valves that direct pressure to the upstream and downstream sides of the test item, according to the test specification. The computer system and customized software automatically control the required testing parameters.

Simple machine intelligence has been built into the computer software. If a leak beyond the preset limit is detected, the program initiates a troubleshooting routine to locate the source of the problem. If it appears that the leakage occurs from a seal seating problem, the computer cycles the valve several times and restarts the test. If the leakage persists, the test is shut down. An environmental chamber is an integral part of the test loop. Used during the temperature extreme test phases, the insulated chamber contains heating elements and cooling coils that enable maximum (300°F) and minium (-50°F) temperature limits to be maintained. 

Appendix F for Specification 6A requires precise measurement of leaks across the gate and seat of the test valve. SwRI developed a sensitive electronic leak detection unit that uses a precision low-pressure transducer to measure the change in the fluid head caused by leaks. The software establishes a baseline level before control valves are opened, and then measures the differential change for the required hold period.

Valve and electrical actuator assembly in test fixture for API-6A test

Valve and hydraulic actuator assembly undergoing low-temperature (-50°F) test

Full-Scale Gas Testing

SwRI maintains a sour gas testing facility for gate valves and other oil field components. This facility contains isolated test cells with safety features that include explosion-proof wiring, H2S and methane sensors, and an automatic air purge system. SwRI has the equipment and experience to provide custom gas mixtures in accordance with the test requirement.

Valve and hydraulic actuator assembly in environmental chamber for API-6A test

For additional information about Mechanical and Materials Engineering Services and Software, please visit  www.mechmatserv.swri.org.

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