Document rx3gDzBKxm82D822LMR01xEke

43--Fire Protection TABLE 43-E STANDARD TEMPERATURE RATINGS FOR AUTOMATIC SPRINKLERS Rating Operating temperature (F) Color Maximum ceiling temperature (F) Ordinary Intermediate High Extra high Very extra high Ultra high 135-170 175-225 250-300 325-375 400-475 500-575 Uncolored* White* Blue Red Green Orange 100 150 225 300 375 475 From Sprinkler Systems, NFPA Standard No 13, Table 3651 'The 135 F sprinklers of some manufacturers are half black and half uncolored The 175 F sprinklers of the same manu facturers are yellow the piping, sends a tiouble signal without tripping the watei-contiol valve The pieaction valve, which contiols the watei supplv to the system piping, is actuated bv a sepai ate automatic detection svstem, which is located in the same area as the spimklei, and not by the opeiation of a spunklei Because the detection system is moie heat sensitive than the spnnklers, the water-supply valse opens soonei than m a div-pipe svstem The watei-supplv valve can also be operated manually Usually an alaim is sounded when the valve opens and staits filling the svstem with watei Theie mav then be time to put out the fiie with poitable equipment before the spunkleis co into action and chench the aiea with water Tins svstem is especialh effective wheic valuable meichandise is handled oi stoied Deluge. The deluge svstem wets down an entne aiea bv admitting watei to spnnklers that aie opened at all times Deluge valves that contiol the watei supplv to the svstem aie actuated bv an automatic detection svstem located in the same aiea as the spnnklers The watei supplv valves can also be operated manually This tvpe of svstem is pnmanlv designed foi e\tia-hazaid occupancies vvheie great quantities of watei mav have to be applied immediatelv over laige aieas Deluge sys tems aie ordmanlv used to best advantage vvheie lapidlv spieadmg oi flash files may .be anticipated, such as in explosives plants, plants handling oi piocessmg nitiocellulose materials, lacquet plants, and buildings which contain laige quantities of flammable materials Another application of a deluge system is an open svstem of outside spnnklers for distnbuting watei ovei the roof, exterior of a building, oi at windows, cornices, etc, to piotect it against fiie fiom adjoining property This type is usually manually operated and is used vvheie constiuction is inadequately pro tected bv design or bv distance from adjacent fiie hazaids In special applications, open spnnklers and closed spi mklers mav be combined in a single svstem vvheie deluge protection is not needed ovei the entne aiea Hovvevei, it must be lemembeied that separate automatic detectors aie also lequned in the aiea covered by the closed spunkleis, that operation of a closed spunklei will not activate the entire system, and that a fiie m the area of the closed spunklei will also cause watei to discharge fiom all of the ojicn spunkleis Automatic alarms, opeiated bv the flow of watei thiough the svstem, should be a part of eveiv standard spunklei installation Such an alaim mav be connected to a centralstation fiie alaim seivice oi to the municipal fiie depaitment, oi may be a local alarm sig nal Its puipose is to give prompt notice that the spunkier svstem is operating It also 1366