Re: notes. codes. etc regarding school-1997

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13–tiF ivs�r:��.i.\'I'1();V()F'St'kl Vh[.P:f2 til'ti I h:�iti 5-2.3.3 Room Design Method. 5-3.2.4 Hose stream demand and water supply duration 5-2.3.3.1* The water supply requirements Ei>r sprinklers reyuirements shall be in accordance with those fi�r Ligh[ � only shall be based upon the room that creates the greatest Hazard Occupancies in Table 5-2.:5. � demand. The den�ity selected shall be that From Figure 5-3.3 Quick-Response Early Suppression (QRES) Sprin- 5-2.3 corresponding to the room size.To utilize this method, klers. (Reserved) (Sve 1--1.5?and.4-1--1.5.2.) all rooms shall be enclosed with walls having a fire-resistance rating equal to the water supply duracion indicated in Table 5-3.4* Large-Drop Sprinklers. 5-2.3. 5-3.4.1 Large-drop sprinklers shall be permitted to protect 5-2.3.3.2 If the room is smaller than the smallest area I ordinary hazard, miscellaneous storage, and other storage r shown in the applicable curve in Figure 5-2.3,the provisions as specified by other NFPA standards. of 5-2.3.1.3(a)shall appiy. 5-3.4.2 Number of Design Sprinklers. 5-2.3.3.3 Minimum protection of openings shall be as 5-3.4.2.1 Protection shall be provided as specified in Table follows: A-5-3.� or appropriate NFPA standards in terms of mini- (a) Ligh[Hazard—automatic or self-closing doors. mum operating pressure and the number of sprinklers to be included in the design area. Exception: Where openings are not protected, calculations shall � include t/ae sprinklers in the roo�n plus truo sprinklers in the commu- 5-3.42.2 The minimum number of design sprinklers for nic¢ting space nearest each such unfirotected opening unless the ordinary hazard and miscellaneous storage in accordance coyremunicating space has only one sprinkler, in mhich case calcula- �'ith this standard shall be 15 for we[pipe and preaction sys- tions shall be extended to the o-peration of that sprinkler. The selec- tems and 25 for double interlock preaction systems and dry tion of the room and co�nmunicating space sprinklers to be calculated p�pe systems. For other storage configurations, the nurr.ber shall be that mhich produces the gre¢lest hydr¢ulic demand. of design sprinklers shali be in accordance with the appro- priate NFPA storage standard. (b) Ordinary and Extra Hazard —�automatic or seif- closing doors with appropriate fire=resistance ratings for the 5-3.4.3 Large-drop sprinkler systems shall be designed enclosure. : such that the minimum operating pressure is not less [han 25 psi (170 kPa). 5-2.3.4 Special Design Methods. 5-3.4.4 For design purposes, 95 psi (650 kPa) shall be the 5-2.3.4.1 Where the design area consists of a building ser- maximum discharge pressure at the hydraulically most vice chute supplied by a separate riser, the maximum num- remote sprinkler. ber of sprinklers thac needs to be calculaced is 3. 5-3.4.5 The design area shall be a rectangular area having ( 5-2.3.4.2 Where the room design method is used, and the a dimension parallel to the branch lines at least 1:2 times the area under consideration is a conidor protected by one row yyuare root of the area procected by the number of sprin- ofsprinklers,the maximum number ofsprinklers[hat needs klers to be included in the design area.,�ny fractional sprin- to be calculated is 5. (See 5-2.3.1.) kler shail be included in the design area. Exceplion: Where the area under consideration is a corridor pro- ' 5-3.4.6 The nominal diameter of branch line�ipes(includ- lected by a single roru of sprinklers and the openings are not pro- �ng riser nipples)shall be not less than L!,��iri. (33 mm) nor tected, the desigre area shall include ull spnnkler.s in the corridor to greater than 2 in. (51 mm). . � a maximu.m of 7. � _ Excepeion No. /: Starter pieces shal! he permitted to 6e 2�/2 in. 5-3 Specia!Design Approaches. (6-I m�n) , . •.� ._:.� _ 5-3.1 General. All special design approaches utilize�theY � �xce�it#on'�� {i�r�;,�tancl� l:nes ar'e larger than 2 in. hydraulic calculation procedures of Section 6-4, except as (51 mm), llae spnnkler shalCbe supplied by a riser nipple lo elevate specified. �� lhe sprinkler 13 in. (330 mm)for 2�/�-rn. (6�F-�nm)pipe and I S in. (380 rnm)for 3-in. (76-�nm)pipe. Tliese dimensions are measured 5-3.2 Residential Sprinklers. frnm the crnterline of tlte pipe lo the deflector. In lieu of this,sprin- * kler.s may be off.set/eorizont�llv a minineum of 12 in. (305 mm). ( 5-3.2.1 Sprinkler discharge rates shalt be provided in accordance with minimum flow rates indicated in individual 5-3.4.7 Hose stream demand and water supply duration residential sprinkler listings, both for the singlr sprinkler reyuiremrnts shall be in accordance with those for extra discharge and the multipie sprinkler discharge of the design hazard occupancies in Table 5-2.3. sprinklers. 5-3.5• Early Suppression Fast-Response(ESFR) Sprinklers. 5-3.2.2* The design area shall br that area that includes 5-3.5.1 ESFR sprinklers shall br permitted to protect ordi- j the 4 hydraulically must demanding sprinklers.Calculations ��•y harard, miscellanrous storage, and other storage as � shall be providrd to verify thr single(1)operating sprinkler �Prci6rd by othrr NFPA standards. criteria and thr multiple(4)operating sprinkler criteria. , 5-3.5.1.1' ESFR sprinklrrs shall be designed such that 5-3.2.3 �M1 herr areas such as attics, basements, or c>thrr thr minimum ��prrating pressure is not less than 50 psi typrs of e�ccupancies are uutsiclr of dwrlling units hut within �,; �,�,� h��.ti) thr sa�nr tiu�ucturr, these arras shall br prutrcted in accur- dance with the��rovisicros uF this standard, including appr��- 5-3.5.2 ESFR sprinklers are suitahle fi�r use with thr haz- ( PI'18IC(�C51btl CI'I[C�'1:1 UI;)-`�..�. dP(Iti I15[C(I Itl�I:ible A-5-3.:i and shall be prrmitted to be used � 1996 Editlon