The FAST ESD is an enhanced ESD system that provides the speed of electrical systems with the reliability of pneumatic systems.

The system is designed to isolate the upstream pressure source (at either the surface test tree hydraulically actuated valve, or a hydraulic surface safety valve) before the well pressure rises above the set points of system relief valves.

In a line rupture situation, the FAST system will isolate the well stream before any significant hydrocarbon releases have occurred thus reducing the possible injury to personnel in the test area along with reducing the risk of fire or explosion and environmental hazards.