Document 3Q5Me36d3Zo3KvryB6G2y9Qn0

Heating Boilers, Furnaces, Space Heaters 401 fi! ciency, the draft loss through the boiler, and the heat release in the com- Ci bustion chamber are subjected to limitation by the cdde:1 Oil-fired ( boiler ratings are established by tests using gun-type oil burners and ~ !lj d Js "= a ccac--o t--o--o' --" "** ~ T- c0o0e0tc)0e oooooo oooooo o" o' o' commercial grade No. 2 fuel oil. Stoker-fired ratings are based on the Gross I=B = R Out-put obtained by oil-fired tests. Gas-fired ratings for boilers having gross outputs greater than 300,000 Btu per hour, where no A.G.A. Rating is published, are based on the Gross I = B=R Output a III l>a*3otoniont-iaQ> -- eoo <*5 w-h oo- SIS obtained by oil-fired tests. Gas-fired ratings for boilers having gross outputs less than 300,000 Btu per hour, where no A.G.A. Rating is pub veocoojwM nc^Mcccocc SS So oo oo co ao co n mot Sco ao oooooo co ccmmmm ill lished, are established by gas-fired tests with atmospheric, single-port- type burners using natural or manufactured gas or a mixture of these two Table 2. SBI Net Rating Data fok Table S Steel Boilers--Oil-Fired- f-Scfo-23d 3 IS? ?? *5 *9 CO eo w os co co 52"O2Sc2oSeo2eo2 CS3OcO:CO2CO2CSO2CSO3 (ohoo-*C O oo co co co ao oo ao oo co no m Mimm CeoOCeoOCc>O C*-O CoOCoC aCtKaCoMooCCCOOaoCoCo CSCcCoCoCotaCoCoCoCcNo McoCcCoCaCo T a b l e .3. I = B = R B o il e r R a t in g a b le 1T SBI Net Rating Steam SqFt U) Btuh (2) 275 320 400 550 66,000 77,000 96,000 132,000 Water Btuh (3) 74,000 87,000 108,000 149,000 Minimum Fubnacb Volume Cu Ft Minimum Heating Subface Sq Ft (4) 2.5 . 2.9 3.6 5.0 (5) 16' 19 24 32 ! e>SoSoSo8o8o gogogogoooSo o2o222o22oE2o22oS o--s-o-ao---oS-o-S--o-|---n|--o|--o|--o|-n2|| Hi WV-C^OIO ' OOONNO MOifOVHCO one CScoD Sto0So<tSoeS*--n*c*^c5>2) oOSoONOOOa^MOo O^OecoOdecSOc9cOoccOcnoiccOcoo ooooS3OoolLIrSP5* 3n fi I ccaoocO-re 111o car-* co wooreMh 5S6oooc C4COC4CCCOCO I 700 900 1100 1300 1500 1800 2200 2600 3000 3500 4000 4500 5000 168,000 216,000 264,000 312,000 360,000 432,000 528,000 624,000 720,000 840,000 960,000 1,080,000 1,200,000 189,000 243,000 297,000 351,000 405,000 486,000 594,000 702,000 810,000 945,000 1,080,000 1,215,000 1,350,000 6.4 8.2 10.0 11.8 13.6 16.4 20.0 23.6 27.3 31.8 36.3 40.9 45.4 41 53 65 77 88 106 129 153 177 206 236 265 294 ill $ 1 a jjs . t -Sco< & ac ill r* i-- --HShS^C eoooco^>eoco coccr-MOCB l -- ~ --tot-moo*- -- c*i3cpr- ooas ----ico-k tot-oor-n SSS p-t - -t -h ^ HMNnctn co cc e* co co-r -r kj 1! g s23S?S '2CcSoto3nio!to* o>io-t-c>oQoocr--oco9 o> tco* ecoo cto ooo o>**tonton^<e3 omrgaon I ococoeococo vtoioioes mfiOOOOOO CldOOOtt IOOOISO oioomioo 000<40>0 locsccooci <omo>-'co,c idnaoimm isNartac> id to toco coco cd cd t--1-> r-1-- ni-nnooco Scocoaoo s Stoker-Fired and Gas-Fired SBI Net Rating not greater than oil-fired rifting. Hand-Fired Net SBI Rating (Steam) not greater than 14 times the square feet of heating surface. 2*3 gases. The. A.G.A. Output Rating of a gas-designed boiler may be used in determining the Net I -- B -- R Rating. The Net I = B= R Rating is determined from the Gross I = B~ R Output by applying specified Piping and Pickup Factors which range from 2.36 to 1.40 for hand-fired boilers, and from 1.56 to 1.288 for automaticallyfired steam boilers, and from 1.333 to 1.288 for automatically-fired hot water boilers. In all cases, the factor decreases as the boiler size in creases. Table 3 is abstracted from the 1951 I=B=R Boiler Rating Tables in the code and illustrates the relationship between Net 1 = B = R Rating and Gross I-- B=R Output. The American Gos Association rates gas-designed boilers at 80 percent of the A.G.A. Input Rating. These ratings are determined by per formance tests described in the A.G.A. Approval Requirements for Central Heating Appliances. The Heating, Piping and Air Conditioning Contractors National As- sociation has adopted a method, based on their physical characteristics for to a , O2h -go .____ lonas"* "co mco hco oeo oo *-4 nNccn* c-c h- KO^t 4t< roi-enocott--CtN'' &* teto-cj 0)00000 ill r5o m*o- d_ io, 0?3 fi tf o 3*8 ;s ooo oO oCOoco nao'CHin ?8g2ONO_W___ ________o___o__o__o___o_ _o_ ccccnn nwcoie co 4T 5 Of-00 OOQO' esswoo, c ooo oooMb oO eeNt*to e-rMornotoogeeeq 80X30 00 aooecci SOO*e-aCOcotO4orOacooOcro] 04 04 04 04 04 0 nil I III ill s oo i t-KJOiOOO -q^ toiot-ooao o oc*>--* r.-o__<_o r- o II IIIN