How is nozzle coverage verified?

• A. Through design calculations and field checks to ensure complete coverage of the protected space.
• B. By visual inspection only
• C. By pressure testing the water supply
• D. By measuring gas concentrations

Answer: (A)

Nozzle coverage verification hinges on making sure the extinguishing agent actually reaches every part of the protected space. This is done by combining design calculations with field verifications. The design calculations determine how many nozzles are needed, where they should be placed, and the required flow rates and coverage area to achieve the intended spray density across all surfaces and equipment in the protected zone. On the job, field checks confirm that the installed nozzles match the design—correct locations, proper orientation, unobstructed spray paths, and appropriate clearances—so that the actual spray reaches all intended areas. Relying on visual inspection alone can miss misalignments or obstructions that block coverage, and options like pressure testing the water supply or measuring gas concentrations are not relevant methods for verifying nozzle coverage in a wet chemical kitchen extinguishing system.