This article includes a list of references, related reading or external links, but its sources remain unclear because it lacks inline citations. (January 2017) (Learn how and when to remove this template message)
A deluge gun, fire monitor, master stream or deck gun is an aimable controllable high-capacity water jet used for manual firefighting or automatic fire protection systems. Deluge guns are often designed to accommodate foam which has been injected in the upstream piping.
Deluge guns are often fitted to fire boats, tug boats, and on top of large fire trucks for use in manual firefighting efforts, where they can be aimed and operated by one firefighter and are used to deliver water or foam from outside the immediate area of the fire. Deluge guns are sometimes installed in fixed fire protection systems to protect high hazards, such as aviation hangars and helicopter landing pads. Similarly, facilities with highly flammable material such as oil refineries may have permanently installed deluge guns. Most apparatus-mounted deluge guns can be directed by a single firefighter, compared to a standard fire hose which normally requires several. Deluge guns can be automatically positioned for fixed systems, or may have portable designs. The latter option enables a firefighter to set up the gun to apply water to a blaze, before leaving it in place to attend to other tasks.
This article may be too technical for most readers to understand. Please help improve it to make it understandable to non-experts, without removing the technical details. (August 2016) (Learn how and when to remove this template message)
A deluge gun can discharge 2,000 US gallons (7,600 liters) per minute, or more. A master stream is a fire service term for a water stream of 350 US gallons (1,300 liters) per minute or greater. It is delivered by a master stream device, such as a deck gun, deluge gun, or fire monitor. Master streams are often found at the end of aerial ladders, tele-squirt nozzles, or monitor nozzles. The high pressure that they require renders them unsuitable for handline use.
A master stream brings with it many risks when used in an urban setting. A master stream should never be fired into a building with people inside, as the force could knock down a supporting wall in a structure and crush victims. Also, the steam resulting from the high volume of water delivered could cause a blowout or displace oxygen from an enclosed area, creating a risk of asphyxiation.
- Hall, Richard (1998). Adams, Barbara, ed. Essentials of Fire Fighting (4th ed.). Stillwater, OK: Fire Protection Publication. ISBN 0-87939-149-9.
- US Patent for improved mobile fire apparatus
- ABS Rules for Steel Vessels 2007 5C.9.11/3 Specific Vessel Types- Chemical Carriers, Fire Protection and Fire Extinction