TURBINE BYPASS VALVES / SYSTEM

Introduction

Turbine bypass valves play a very major role in Power Plant applications. Within a short period of twenty four hours, a power plant may be required to operate at minimum load, increase to maximum capacity for major part of the day, immediately lower back to minimum load and then back to maximum capacity. Bypass System permit unit start up and shutdown in a lifesaving manner for critical heavy components in boiler and turbines. Bypass valves are supplied with hydraulic, electric or pneumatic actuators as per the process requirements alongwith complete control systems as an option.

Functions:

• To perform quick and economic start up, including cold start, warm start and hot start in a lifesaving manner for critical heavy components in boiler and turbine.
• To operate with the boiler shutdown.
• To perform warm and hot startup in a short time after a trip i.e. brings the unit back to load
• To run the unit down to house load.
• To perform real “two-shift’ operation”.
• To avoid condensate losses to the atmosre and reduce the start up noise to the ambient outside the plant.