What does PDP stand for and what is its maximum recommended value unless otherwise specified?

• A. PDP
• B. Angle of Approach
• C. Angle of Departure
• D. Discharge Manifolds in Relay

Answer: (A)

Pump Discharge Pressure is the pressure on the discharge side of the pump as water leaves through hose and appliances. It combines the nozzle pressure with the friction losses along the line. This value is what the operator uses to judge how hard the pump is pushing water into the system.

The best answer is that PDP stands for Pump Discharge Pressure, and the maximum recommended value under normal conditions is 150 psi unless a specific setup or manufacturer guidance dictates otherwise. Keeping PDP at or below about 150 psi helps protect hose, fittings, and equipment from over-pressurization while still delivering the needed nozzle performance. In longer runs, smaller hoses, or special relay configurations, the target PDP may be adjusted, but 150 psi is the general safe cap in typical operations.

The other terms listed are unrelated to what PDP stands for, so they don’t describe the acronym or its standard value.