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Dear gentlemen,
First of all I would like to thank you for this excellent Forum that provide to us an opportunity to share our question and problems.
In our thermal power plant we have the following:
boilers 850t/h
2x steam Turbine 700MW
The steam Turbine will trip at low condenser vacuum and LP Pressure Turbine bypass control valve kept closed when Turbine tripped at low vacuum in order to protect the mechanical integrity of the unit because The condenser is not designed to hold a pressure and as such must be prevented from any positive pressure above atmospheric. Often rupture discs are fitted as a mechanical prevention against any pressure surge.
My question is about High pressure turbine bypass control valve position OPEN OR CLOSE when Turbine trip at Low vacuum.
Note: This bypass system permits stable operation of the boiler when the turbine trips off line or during start-up operations.
Thank you for your immediate help
First of all I would like to thank you for this excellent Forum that provide to us an opportunity to share our question and problems.
In our thermal power plant we have the following:
boilers 850t/h
2x steam Turbine 700MW
The steam Turbine will trip at low condenser vacuum and LP Pressure Turbine bypass control valve kept closed when Turbine tripped at low vacuum in order to protect the mechanical integrity of the unit because The condenser is not designed to hold a pressure and as such must be prevented from any positive pressure above atmospheric. Often rupture discs are fitted as a mechanical prevention against any pressure surge.
My question is about High pressure turbine bypass control valve position OPEN OR CLOSE when Turbine trip at Low vacuum.
Note: This bypass system permits stable operation of the boiler when the turbine trips off line or during start-up operations.
Thank you for your immediate help