Question 58Steam Plants - 1st Asst/Chief

The correct answer is B) Pump discharge check valve. During the initial starting of a standby turbine-driven boiler feed pump, the pump discharge check valve should remain closed. This is to prevent backflow from the boiler system and allow the pump to build up the necessary pressure before opening the discharge valve. The other valves listed, such as the turbine exhaust valve (A), turbine steam supply valve (C), and pump suction valve (D), should be opened or adjusted as per the specific operating procedures to properly start and load the standby pump.