Which of the following statements reflects the required action for pressure readings to ensure unobstructed water flow in a spray system?

• A. Take readings at the hydraulically most remote nozzle
• B. Take readings at the nozzle nearest the pump
• C. Take readings at any random nozzle
• D. Take readings at three nozzles simultaneously

Answer: (A)

The key idea is to verify the worst-case pressure in the system. In a spray layout, pressure falls as water travels through pipes, fittings, and valves. The hydraulically most remote nozzle experiences the greatest pressure drop, so its pressure is the limiting factor for delivering unobstructed flow to the entire system. Measuring there shows whether there is enough pressure at the far end to operate all nozzles; if that reading meets the required pressure, the rest of the network should also have adequate flow. If the pressure at the farthest nozzle is too low, it signals a blockage, a valve not fully open, undersized piping, pump issues, or other restriction affecting overall performance.

Taking readings near the pump would overstate the available pressure and miss downstream problems. Testing a random nozzle risks missing the true worst-case point. Measuring three nozzles at once isn’t necessary and doesn’t identify the minimum pressure the system must sustain for all nozzles to operate.