Water mist nozzle / system

NFPA 15 / NFPA 13 / NFPA 20 / ISO 13702 (fire protection) / company legend practice (NFPA 750)

Drawn as

A nozzle on a small-bore line with a fine dotted spray cone, often inside an enclosure outline and marked "WM".

Meaning

High-pressure water mist for turbine hoods, generator enclosures and machinery spaces. Usually a vendor package with its own pump and cylinders. No dedicated component.

Variants

Mist skids are drawn as a package box with cylinders or a pump