Valvtechnologies Turbine Bypass System

The steam turbine bypass system will allow the operator to keep the gas turbine and the heat recovery system generator (HRSG) on-line in the event of a steam turbine trip or to facilitate faster start-ups of the CT and HRSG. The turbine bypass system also enables a combined cycle plant to operate at turndown conditions, below that which can be achieved solely with GTGs. During start-up and/or turbine trips, the steam dump control valves control the pressure and flow through the main and IP steam lines. Meanwhile, the attemperation system controls the temperature into the reheat inlet and condenser. These two components working together maintain the pressures and temperatures of the steam system, insure stable drum level control during a trip event, and allow for a faster re-start of the steam turbine. The turbine bypass system’s major function is to isolate the bypass loop during normal operation. The valves contained within the system MUST have tight isolation, as the system is isolated 95% of the time or more. Failure to properly isolate the system results in damaged seats and valves, which result in lost energy and loss of control during start-up and turbine trips. The Valvtechnologies, Inc. turbine bypass system provides the repeatable shut-off this application requires

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