JASC was featured in Power Engineering’s April, 2014 publication, discussing innovative applications and design modifications that have lead to improvements in actuator technology, reducing costs and providing better performance for high-pressure steam bypass, turbine bypass and other critical power plant operations.
Read JASC’s contribution to the article below.
Over time, there may not be another auxiliary system more maligned than that of a back-up liquid fuel system on a dual fuel gas turbine. The hardware shortcomings responsible for the inability to start on liquid fuel or transfer from gas to liquid fuel, check valve failures, flow divider failures, fuel system evacuation, exhaust temperature spreads and related turbine trips have all been addressed by designs developed by JASC Controls. Water cooled check valves, which prevent carbonization, metal to metal sealed water injection check valves rated for service at 750 degrees “F”, multiple use crush gasket technology which replace o-rings with a 1000 degree “F” rating at 2000 psi and a Zero Emissions Equipment design which allows a turbine owner to test the readiness of the liquid fuel system without firing on oil are examples of the JASC’s unique technology.
These system specific products have two common design goals. First, they provide reliable operation for at least 32,000 hours or until a scheduled turbine service interval is reached. This provides the optimal timing for returning the valves to the JASC facility for refurbishment after three or four years of use.
Second, the valves must maintain an ANSI Class 6 sealing capability from installation until removal for refurbishment. Elimination of reverse flow results in separation between the turbine combustion process and auxiliary systems such as liquid fuel, purge air and water injection. With no reverse flow of combustion gasses into these systems, back-up fuel system availability and reliability typically exceeds 98 percent.
Finally, JASC’s solutions are configured to be interchangeable with the turbines existing hardware. This characteristic both minimizes the cost and reduces the time associated with performing fuel system upgrades on a turbine of any age.