Which statement is NOT a concern when observing discharge patterns from open spray nozzles on a deluge system?

• A. Nozzles are from different manufacturers
• B. Nozzles are correctly positioned
• C. Obstructions prevent discharge patterns from wetting protected surfaces
• D. Patterns are impeded by plugged nozzles

Answer: (A)

When you observe discharge patterns from open spray nozzles on a deluge system, the focus is on whether the water from every nozzle wets the protected surfaces as designed. The most important factors are where the nozzles are positioned, whether anything blocks the spray path, and whether any nozzle is blocked or clogged. If a nozzle is mispositioned, it can leave parts of the area uncovered; obstructions can shadow or divert the spray so it doesn’t reach its target; and plugged nozzles can restrict flow or distort the pattern, reducing coverage.

The idea that nozzles come from different manufacturers isn’t inherently a concern for this observation. As long as each nozzle is an approved device and installed according to the design, differing brands won’t automatically prevent the system from achieving the intended wetting pattern. What matters is the actual discharge performance and coverage, not the brand.