The pressure sensing line connection for each pump must be made where in relation to the pump's discharge check valve?

The pressure sensing line connection for each pump must be made between the pump's discharge check valve and the discharge piping. This is crucial because it ensures that the pressure readings reflect the actual conditions of the system after the pump has discharged water and before it reaches the rest of the system.

Connecting the sensing line in this manner allows for accurate monitoring and control of the pump's operation, which is essential for system efficiency and safety. If the sensing line were located before the check valve, it could give inaccurate pressure readings influenced by factors such as backpressure or static pressure, which do not represent the operational pressure of the system.

Having the connection after the check valve but before the discharge piping allows the system to account for any resistance or variations in flow that might affect pressure downstream, ensuring that the pump operates effectively within its design parameters.