A fire burning without flame and barely spreading.

Weak water/acid solution inside a pressure vessel which activates bicarbonate of soda when triggered, expelling water" (mixture) under pressure from the resulting carbon dioxide. Obsolete and often replaced with an APW or multipurpose extinguisher.

A short piece of fire hose, usually 10 to 20 feet long, of large diameter, greater than 2.5 inches (65 mm) and as large as 6 inches, used to move water from a fire hydrant to the fire engine, when the fire apparatus is parked close to the hydrant.

A fire stream emitted from a smooth-bore nozzle. This fire stream has the greatest reach and largest drops of water.

Fire stream from round orifice of nozzle. Compare straight stream.

Rigid tool for tightening or loosening firehose couplings.

Locking device on doors used for delaying opening for short period (10-15 seconds) after release is pressed. Permitted as panic hardware in limited circumstances. May also refer to a security system that releases electronic door locks when a fire alarm is activated, such as in stairwells of a highrise building.

Remote camp usually near a fireline, and lacking the logistical support that a larger fire camp would have.

Behavior of a fire producing sparks or embers that are carried by the wind and which start new fires (spot fires) beyond the zone of direct ignition by the main fire. A cascade of spot fires can cause a blowup.

See fog nozzle.

Fire suppression system in a building, typically activated by individual heat-sensitive valves, or remotely controlled by other types of sensors, releasing water onto the fire. May be wet" (water-filled) or "dry" (air-pressurized).

Sector of incident command where responding resources arrive for assignment to another sector. Often an essential element in personnel accountability program.

Rules for the operation of a fire department, such as how to respond to various types of emergencies, training requirements, use of protective equipment, radio procedures; often include local interpretations of regulations and standards. In general, procedures" are specific, whereas "guidelines" are less detailed.

System of pipes inside a building for conducting water for firehose attachments; may be pressurized with water (wet") or remain "dry" until activated in an emergency; supplied either from a fire hydrant attachment or from a fire engine's pump. Permits firefighters to reach higher levels of tall buildings without having to run hoses up the stairs.

The pressure in a water system when the water is not flowing.

A Siamese inlet to a standpipe or sprinkler system. Named for early application of steam engines for pumps.

Large outlet of fire hydrant.

A type of coupling used on fire hose. The coupling is sexless, and secures with a 1/4 turn of the coupling. The coupling may or may not have some sort of locking device.

A fire stream generated by a combination nozzle, characterized by a long reach and large water drops. It is essentially the narrowest of fog patterns that can be produced.

Round, hollow stream formed as water passes a round baffle through a round orifice (e.g., on an adjustable nozzle.) Compare solid stream.