Question 74

Gate valve and check valve are required on the discharge side of an ejector pump.

The discharge side of an ejector pump necessitates the installation of both a gate valve and a check valve to ensure proper operation and prevent backflow.

A) Gate valve and check valve

This option is correct because a gate valve allows for the isolation of the pump for maintenance or repair, while a check valve prevents the reverse flow of water, which is crucial for maintaining system integrity and efficiency.

B) Backwater valve and gate valve

While a gate valve is important for pump maintenance, the backwater valve is not specifically required on the discharge side of an ejector pump. The primary role of a backwater valve is to prevent sewer gases or water from backing up into the system, which does not address the specific requirements of an ejector pump discharge.

C) Flexible coupling

A flexible coupling is not required on the discharge side of an ejector pump. Its primary purpose is to connect two shafts and allow for slight misalignments, which does not pertain to the discharge requirements of the pump itself.

D) Water hammer control

Water hammer control devices are not mandatory on the discharge side of an ejector pump. While they may help mitigate issues related to pressure surges, they do not fulfill the essential requirements of isolation and backflow prevention necessary for proper pump function.

Conclusion

The requirement of a gate valve and check valve on the discharge side of an ejector pump is vital for ensuring operational efficiency and preventing backflow. Other options either do not address the specific needs of the system or serve different functions that do not apply in this context. Thus, option A is the only suitable choice for the requirements of an ejector pump.