Testing of subsea gate valves in sand slurry

This paper reports on three gate valves from different manufacturers that have been performance tested in a test loop. Anticipated production rates on the Statfjord Satellite Fields (SSF) have been simulated. The testing was part of the pre-qualification of the Christmas tree valves for this project. The tests were performed in order to determine the expected cycle life and failure mode while operating in a sand slurry environment. The valve's ability to hold gas liquid pressure was monitored throughout the test. On completion of the tests, the valves were disassembled and inspected for wear and tear, and the gates subjected to a material analysis. Information gained from the tests has proved to be very useful for the development of SSF