IEEE 979:2012 pdf free download – IEEE Guide for Substation Fire Protection
3.2 Fire-suppression system terms
clean agent gas fire extinguishing systems: A fire protection system that uses clean gaseous agents thatare (1) electrically nonconducting,(2) volatile or gaseous, and (3) do not leave a residue on evaporation.The system discharges the agent for the purpose of achieving a specified minimum agent concentrationthroughout a hazard volume. A clean agent complies with restrictions on the production of certain Halonfire extinguishing agents under the Montreal Protocol signed September 16,1987.
deluge sprinkler system: A sprinkler system employing open sprinklers that are attached to a pipingsystem that is connected to a water supply through a valve that is opened by the operation of a detectionsystem installed in the same areas as the sprinklers. When this valve opens，water flows into the pipingsystem and discharges from all sprinklers attached thereto.
double interlock preaction sprinkler system: A Preaction system that admits water to sprinkler piping onoperation of both detection devices and automatic sprinklers and only discharges from opened sprinklers.This type of arrangement provides the most redundancy to reduce the probability of accidental sprinklerdischarge by requiring both detection devices and sprinklers to activate independently prior to water beingadmitted to the piping network. This type of arrangement also allows for pressure monitoring to detectleaks in the piping network or open sprinklers prior to water being admitted to the system.
dry pipe sprinkler system: A system employing automatic sprinklers that are attached to a piping systemcontaining air or nitrogen under pressure, the release of which (as from the opening of a sprinkler) permitsthe water pressure to open a valve known as a dry pipe valve, and the water then flows into the pipingsystem and out the opened sprinklers.
foam-water system: A sprinkler system that generates a foam-water solution and discharges it onto thehazard to be protected utilizing air-aspirating foam-water sprinklers or nozzles or non-air-aspiratingstandard sprinklers.
overhead sprinkler system:The installation includes at least one automatic water supply that supplies oneor more systems. The portion of the sprinkler system above ground is a network of specially sized orhydraulically designed piping installed in a building, structure,or area, generally overhead, and to which sprinklers are attached in a systematic pattern. Each system has a control valve located in the system riseror its supply piping.Each sprinkler system includes a device for actuating an alarm when the system is inoperation. The installation includes at least one automatic water supply that supplies one or more systems.The system is usually activated by heat from a fire and discharges water over the fire area.
single interlock preaction sprinkler system: A single interlock system is a Preaction system that admitswater-to-sprinkler piping upon operation of detection devices and discharges out only the openedsprinklers. This type of arrangement reduces the probability of accidental sprinkler discharge by requiringthe activation of a detection device prior to admitting water to the sprinkler piping and then requiring asprinkler head to open prior to water flow.
water mist system: A distribution system connected to a water supply or water and atomizing mediasupplies that is equipped with one or more nozzles capable of delivering water mist intended to control,suppress, or extinguish fires. Water mist systerms must only be used for applications that they are listed foror where specific research and testing has validated the application.
water-oscillating monitor: Typically a supplement to an overhead sprinkler or foam system, they provideadditional delivery of the liquid suppression agent to areas shadowed from the overhead sprinkler system.
wet pipe sprinkler system: A sprinkler system utilizing automatic sprinklers attached to a piping systemcontaining water and connected to a water supply so that water discharges immediately from sprinklersopened by heat from a fire.
video image detection: The principle of using automatic analysis of real-time video images to detect thepresence of smoke or flame.