Which of the following is true regarding determining total pressure loss?

• A. Ignore friction losses.
• B. Only consider nozzle pressure loss.
• C. Include pump pressure loss.
• D. Exclude pump pressure loss.

Answer: (D)

When determining total pressure loss, focus on energy losses inside the piping network and at the nozzle, not on the energy the pump provides. Friction losses in hose and fittings, valve losses, and any nozzle restriction reduce pressure as water moves through the system, and these losses must be summed to know how much pressure is actually being lost before the nozzle. The pump’s pressure is energy added to the system, not a loss, so it isn’t included in the total pressure loss calculation. In practice, you add up all friction and component losses and any nozzle loss, then ensure the pump can supply enough pressure to overcome those losses and still deliver the required nozzle pressure. Excluding pump pressure loss is the correct approach.