An oil producer from the United States employed Emerson and the company's local partner, Puffer-Sweiven, to replace existing traditional actuator systems on shutdown valves at production wellheads with two Bettis RTS electric valve actuators
Successfully pilot-tested, the solutions reduced power consumption and surge events, improved time to market (TTM) with quick implementation, and ensured data-based maintenance decisions. The FQ Series fail-safe quarter-turn actuator mounted on a ball valve, and the FL Series fail-safe linear actuator mounted on a reverse-acting gate valve. As electric actuators, these did not require air compressors, filtration and tubing.
The existing model cost the producer high maintenance charges and operational disruptions as it required addressing failures in cases of power outages or air leaks. Diaphragm wear and corrosion in the air lines raised safety issues as they needed manual intervention. Emerson's systems eliminated this step with its onboard diagnostic features to enable remote monitoring and troubleshooting, including partial valve stroke test (PVST). Equipped to achieve Safety Integrity Level 3 (SIL3), they are mechanical fail-safe to support emergency shutdown applications with the necessary response time. To deal with outage issues, the systems come with a fail-safe 24 V DC circuit, independent of the main power grid.
Capable of operating within a temperature range from -40 °F to +140 °F (-40 °C to +60 °C), it solved the problem of frozen instrument air supply lines of the traditional actuators during colder seasons.
The new systems eliminated methane emissions which were common with each stroke from the tradional actuators.
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