Which components are used to determine the required discharge pressure for a handline?

• A. Intake pressure influences source capability but is not added to PDP
• B. Elevation losses
• C. Friction loss of hose/fixtures
• D. Target nozzle pressure, friction loss of hose/fixtures, and any elevation losses

Answer: (D)

Determining the required discharge pressure means planning what pressure must be at the nozzle while accounting for what is lost along the hose line and any changes in elevation. The pump discharge pressure is the sum of the target nozzle pressure, the friction losses in hose and fittings, and any elevation losses from the pump to the nozzle. Intake pressure affects whether the source can deliver enough flow but isn’t added into the discharge pressure calculation itself. So the complete set of components used is the target nozzle pressure, friction losses, and elevation losses. For example, aiming for 100 psi at the nozzle with 15 psi friction loss and 5 psi elevation loss requires a pump discharge pressure of 120 psi. The other options are incomplete because they cover only part of the losses or focus on intake pressure, which isn’t added to PDP.