Consider a subsystem of a thermal power plant as shown in Fig. 12.24. It consist
ID: 1002506 • Letter: C
Question
Consider a subsystem of a thermal power plant as shown in Fig. 12.24. It consists or water pump, two boilers, and two steam turbines. The operator is required to turn on the boiler B_1 to start the turbine T_1. If T_1 fails to start, the operator is expected to turn oft B_1 and turn on the boiler B_2 to start the turbine T_2. Construct the event tree for the by considering the following possibilities: the operator may initially forget to turn on the boiler B_1 If T_1 does not start, the operator may fail to turn off B_1 or fail to turn on B_2, when the operator turns on. the boilers B_1 and B_2 may fail to start (damaged), when steam is received from the respective boilers, the turbines T_1 and T_2 may fail to start (damaged), if both turbines are made to start accidentally, the feed water pump may fail (while trying to supply adequate quantity of water to both the boilers simultaneously).Explanation / Answer
if the operator forget turn the boiler the water be rebosed of boiler include may be come the turbine
the two boiler need level detectors to indicate when the water reaches a certain height and they automatically turn off the pump and turbine
floodgates to prevent the passage of water to the turbines if the water of the boilers also pass a gate at the entrance to the boiler to prevent water pass in excess
the control panel must have alarm indicators that say the activation of any of these systems