2208 W CASINO RD 2018-01-01 MF Import

f i Casinu Itnnd Pirc flow 1'ngc 1 of 3 � � Bass Van Soest II From: Barry Gooding Sent: Wetlnosday,Juno 11,2008 10:A5 AM . To: eass Van Soest SubJett: FW:Casino Road Fire tlow Thank you, � Berry Gooding Soulh Puget Sound Branch Manaper � Smilh Fire Systems ; D:253.248.2641 �, C:253.380.0483 I F�253.97�2350 I ; �.�-- � ' ------- ---.._...--� ------- — i From: Ken lsman[mallto:IsmanC'unfsa.org] ' Sant: Wednesday,]�ne Il,20D6 10:48 AM To; Barry Gooding Subject:RE: Casino Road �Ire flow � M•.Gooding: Spray epnnklers,which have been used since the 1950's are only deslgnetl to provide"fire control'In a bullding, � as defined in seclion 3.3.0 0l NFPA 13. When a lire occurs in a bullding protected with spray spdnklere,lhe fire i department is expected ro put Ihe fire out�vhen they artive on Ihe scene, uslnp additionel water abova and beyond what is being used for the apnnkkre. For lhis reeson, NFPA 13 requlres e"hose sVeam demand'to be i edded to the sprinkler demand so that the water supply can provide water for both the spnnklers and the fire i department upon thelr arrlval. For storage occupancles protected wNh spray sprinklers,the hose stream demand i is provldod In Chapters 12 through 20 of NFPA Y3, but Is almost elways 500 gpm. � ESfR spnnklers have been around since 1989 and are designed to provide Gre suppression instead of fre control. See section 3.3.9 of NFPA 1, for e definitlon of fire suppression. As such,the f�re department will not have lo do as much work when they a•rive on the scene of a fire in a buildiny protecled by ESFR mrlorlESFR he ' � hose stream demand for most sltuatlons covered by chapters 12 through 20 0l NFPA 13 is 250 gp � spnakiers ralher than the 500 gpm requlred for spray spr)nklers. �I In addition to the savings in hose s�ream tlemand,there are also eavings In flow need��d from the sprinklers � themsclves with ESFR. In order to pmvide an example, I am going lo have N assume a type ol slorage and an I airanAemenL Take, for example, 20 ft hlgh slorege o1 Group A plaslics(not expanded,in cartons)on double•row racKs In a bulldln0 vAth a roaf 2fl ft over the floor, protected wNh a wel pipe sprink�er syetem. According ro Figure I 17.2.1 2(e)01 NFPA 13,thls storepe cFm be prolectetl wilh K-16.B spray spnnklers al a 0.8 gpm per sq 1l densiry , I over 2000 sq ft i(sprinklers are Installed al the ceiling only (no In-racks). If thls prolection optlon Is chosen,lhe i minimum Oow required to protect thls storage with spray apdnklere would be 1 B00 gpm(0.8 x 20D0= 1800). I I lowever,with Mction loss in the pipee, �he acWel flow is more likely to be closer to 1,8�0 gpm es more water (lows from Ihe spdnklere cloeer to the weter supply because they are al e higher pressure, Adding Ihe hosa ct�eam demand antl the tota!Ilow requ rod tor spray spnnkters to protect thic option is about 2,300 gpm i Contrast the example ebovc with the installalion of ESFR sprinklers lo handle the same sroroge. Table 17.2.3.t allows K-14 ESFR sprmklers to be usod et 50 psi to protecl this commodity end storaye arrangement. At 50 psl, s K-14 sprinkler will discharge 9�J gPm (tlow equals the k-factor limes tbe squere root of the pressure). Sectlon 172.3.3 requires the deslgn area with ESFR sprinklers to be 12 spnnklers,so the minfmum flow wlth ESFR „ sprinkiers is 1,1R8 gom(12 x�J�J= 118ti) Howevcr, the sprinklers closar lo Ihe water supply are going to Oow � �� 'i G'1112006 � �