Leak detected from a Flow Wing Valve actuator body vent. On investigation with gas detector at 1/2 metre distance, reading found to be 80%LEL.
Investigation confirmed that the seal failure was down to fair wear and tear. These actuators are tested annually by Well Services and during the last test no leak was identified. The tell tale operated as per design and prevented overpressure of the actuator canister.
The Well was immediately isolated.
Actuator was replaced.
Flow wing actuator