Pressure readings for a water spray system shall be taken to ensure water flow is not impeded by partially closed valves or plugged nozzles. At which nozzle location must this reading be taken?

Pressure readings for a water spray system shall be taken to ensure water flow is not impeded by partially closed valves or plugged nozzles. At which nozzle location must this reading be taken?

• A. AT THE HYDRAULICALLY MOST REMOTE NOZZLE
• B. AT THE MOST REMOTE NOZZLE IN THE SYSTEM
• C. AT THE NOZZLE IN THE MID POINT OF THE SYSTEM
• D. AT THREE RANDOM NOZZLES

Answer: (A)

In a water spray system, you want to verify that water can reach every nozzle with enough pressure, even if some restrictions exist along the piping. The pressure reading should be taken at the hydraulically most remote nozzle—the end of the line that has the longest or most friction-filled path from the water supply. This location represents the worst-case point for pressure loss when water is flowing. If a valve is not fully open or a nozzle is partly plugged, the impact will show up there first, revealing a potential flow impairment before it would at nearer nozzles. Measuring at this farthest point ensures the system can deliver the required pressure throughout, not just at more accessible locations. Reading at a mid-point or random closer nozzles could miss an issue that only becomes apparent at the far end, which is why the farthest, hydraulically remote nozzle is the correct test location.

In a water spray system, you want to verify that water can reach every nozzle with enough pressure, even if some restrictions exist along the piping. The pressure reading should be taken at the hydraulically most remote nozzle—the end of the line that has the longest or most friction-filled path from the water supply. This location represents the worst-case point for pressure loss when water is flowing. If a valve is not fully open or a nozzle is partly plugged, the impact will show up there first, revealing a potential flow impairment before it would at nearer nozzles. Measuring at this farthest point ensures the system can deliver the required pressure throughout, not just at more accessible locations. Reading at a mid-point or random closer nozzles could miss an issue that only becomes apparent at the far end, which is why the farthest, hydraulically remote nozzle is the correct test location.