Elliott Group, a specialist in the design, manufacture, and service of technically advanced centrifugal compressors, steam turbines, power recover expanders and axial compressors, has recently introduced a new pneumatic trip system with partial stroke actuation. The partial stroke pneumatic trip system provides turbine operators with a safe and effective way to regularly test the trip valve without interfering with the turbine’s operation or its ability to trip.
Pneumatic trip systems provide an important safety function for steam turbines. Proper maintenance and testing are necessary to ensure safe and reliable equipment operation. Testing the trip system on a regular basis can mean the difference between the turbine tripping when necessary and catastrophic failure. Elliott’s patent-pending system completes a partial stroke of the trip valve within seconds, enabling operators to quickly determine if the trip valve is working properly.
Elliott’s pneumatic trip system with partial stroke actuation is available for new steam turbines and retrofits of existing turbines. Operators can initiate the partial stroke locally or remotely via a distributed control system (DCS). Standard DCS hardware is suitable for either application, providing flexibility to adapt the partial stroke system to any equipment configuration.