During a resupply operation, which formula is used to determine the pump discharge pressure?

The correct formula for determining pump discharge pressure during a resupply operation is based on the concept that the pump discharge pressure (PDP) must overcome both the required intake pressure and additional factors that can affect the system's performance. The required intake pressure is the necessary pressure needed at the pump intake to ensure that water flows effectively from the source to the pump, while total pressure loss (TPL) accounts for any friction losses through hoses, fittings, and other components in the water supply system.

By adding the required intake pressure to the total pressure loss, you obtain the required pump discharge pressure, ensuring that the pump can adequately supply water at the desired flow rate and pressure at the discharge point. This understanding is crucial in operating fire apparatus efficiently, as it dictates how much power the pump needs to function properly during operations.

The other formulas presented do not represent the correct relationship for calculating pump discharge pressure in this context, as they either involve irrelevant parameters or do not reflect the requirements of water supply operations accurately.