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Dalmatian
Firehouse dog.


Dead lay
A load of hose on a pumper, but not connected to a pump outlet. Often used for larger supply lines.


Dead Man Zone
Unburnt areas around edges of brush fire.


Deck gun
A master stream device mounted to top deck of pumper.


Deflagration
An explosion with a propagation front traveling at subsonic speeds, as compared to supersonic detonation.


Deluge gun
A master stream device that can be positioned on the ground based on the need of the incident commander.


Deluge system
Type of sprinkler system in which sprinkler heads do not have individual valves, and the water (or other extinguishing agent) is disbursed from all sprinkler heads simultaneously when a central (or zoned) valve is triggered by a sensor (or manually). Typically reserved for industrial areas where rapid fire spread must be prevented at the cost of damaging non-burning materials.


Demob
Demobilization, or a crew being removed from working a fire.


Denver Door opener
Heavy pry bars connected with a hinge, one with an adjustable foot, used for prying open doors.


Denver tool (also called TNT tool)
A combination axe, sledgehammer, pry tool, ram, and D-handle pull tool used to gain forcible entry to buildings, automobiles, etc. during emergency situations.


Detection system
See Alarm system.


Detergent foam
See Aqueous Film Forming Foam.


Direct Attack
Any treatment applied directly to burning fuel such as wetting, smothering, or chemically quenching the fire or by physically separating the burning from unburned fuel.


Direct attack
Putting the wet stuff on the red stuff." A form of fire attack in which hoses are advanced to the fire inside a structure and hose streams directed at the burning materials.


Discharge flow
The amount of water flowing from a fire hydrant when it is opened; compare to static flow and residual flow.


Dispatch
Refers to person or place designated for handling a call for help by alerting the specific resources necessary.


Distributor pipe
Portion of fire hydrant or sprinkler system connecting main loops to smaller loops where outlets are located.


Double female
Firehose adapter for connecting two male" couplings together; may also adapt different sizes on either side.


Double male
Hose coupling adapter with two male-threaded connectors back-to-back; used for connecting two female couplings together.


Dozer line
Fireline constructed by the front blade of a bulldozer or any tracked vehicle with a front mounted blade used for exposing mineral soil. Also catline.