Document 15pDxQrQavpeZo5bDeMgbrX1m

* if'-br'j 'v^i>x> American Society 0/ Heating and Ventilating Engineers Guide c pter 10--PirING FOR Steam Heating Systems Table 15. Pipe Sizes for Vacuum Pump Systems, where Equivalent Length o Boiler or Source of Supply to Farthest Radiator Exceeds 200 Ft Capacity in Sq. Ft. of Equivalent Radiation Based on 4 oz. Total Pressure Drop Pipe Bob Inches EQOTTAtBNrTr LLEeNnGgTtHh or Pips rsotf Boiler to Farthest Radiator, Includlvo Main and Riser. - (See Note 6.) Supply Main.Dripped and Branches to Risers Dripped-- Steam and Condensate flowing in same direction. instructions FOR USING TABLE 15 311 * . hnnrhes more than 8 ft. in length should be one size larger than shown -'.-.LI.-:*R':a--d--ia,tor Dran.u= Es'w' iinn--CC*oolIuu'1rno:inn' A. generally considered good practice to greatly exceed 1 oz. drop in pressure 'ImSSrff^iSci."nx^r-.i*a.I'rAct'Vhi--Ts'!Al*nrO12'o0r' >,ftt.;gfe.e,,nq1eu,rjivavalalyilee-nn-t-t-l-lee--nn--ggtthh of run nor to exceed 1 lb. total pressure drop in any ^t`festy.i^sA't^sVTjmi&h'AieI.-sder wtaobrlkems anpsphlyipwhhaevree bpeipeensmaardeep.ro(ApelsrolysreeeaTmaebdlesN7oandt^"** *0r t*efect.lve r 100 Ft. 200 Ft 300 Ft 400 Ft. AB C materialor based on X lb. condensation per square 'fo--o--t--p--e--r--h--o-u--r---e--q.u.i:v-aWlent |ftNSr3g5dficatiCdanpafincditieasctubaasl eddiaomnetfetr otfos. taonwdabrdwpiupe. [ength to' b.e'--ad^debd to/-SseetraTiagbhlter4u)n. of pine for vanri'oTMu,s. fcit,,ti-ngs and valves X 1 i'll ix 245 IK 380 79 173 269 ilV(XtV.>u------ ,, are to be proportioned according to the equivalent length of run from the Is r'SjfleroDr source of supply to the farthest radiators supplied by the main. 'pv^i^^hine equivalent length of run then use figures in corresponding Columns 2 2K 3 3K 4 5 6 8 10 12 771 1270 2326 3474 4914 9092 14,924 31,066 56,689 90,985 546 898 1645 2457 3475 6429 10,553 21,967 40,085 64,336 Pipe Size Inches ^^K(S.td- for sizing the entire run. 395s3^Evi''F& example: If the distance from boiler or source of supply to the farthest radiator -the longest main should be 300 ft., all mains are to be sized from Column D; if 400 ft., jJgHMKpv-hi'c""a`'Stoupnply#risaer6s00arfet-to-CbbelupmronpGor-tioned according to the equivalent length of run from (fcVtiie-bouer 01 source of supply to the farthest radiator on each riser. Determine the IfR"^distance to the farthest radiator then use figures in corresponding Columns (B to G) [l^K'Tor sizing each riser; providing the amount of radiation for that riser does not exceed gfeiariiounts'shown in Column H. Where riser capacities are found to be in excess of JRv amounts shown in Column H, step up to necessary size indicated in that column, IwE-"ft'c't.c,F;ria,rrv. example: If the distance from the boiler or source of supply to the farthest IV- vVradiatqr on a supply riser is 300 ft., that riser is to be sized from Column D, providing iC ithe"amount of radiation does not exceed the amount shown in Column H. If the amount f ej&eds that in Column H, use amounts shown in Column H for sizing that entire riser. I')*?A.jf.-another riser taken from the same main as the one indicated is only 200 ft., this rriser should be sized from Column C, providing the amount of radiation does not exceed Riser Main K 100 Ft. h 200 Ft M X Xi 800 1400 i IX IX IK 2400 3800 m2 8000 2 .2K 13,400 2K 3 21,400 3 3K 32,000 3X 4 44,000 568 994 1704 2696 5680 9510 15,190 22,710 31,220 300 Ft N 462 810 ' 400 700 1387 2195 1200 1900 4622 7745 4000 6700 12,360 18,490 10,700 16,000 25,430 22,000 358 626 1073 1698 3575 5990 9565 14,300 19,660 326 570 976 1547 3256 5453 8710 13,020' 17,910 |i.-.;that-as shown in _ Column H. .. - "' 'v-;, . -7..:For practical purposes the pipe sizes on the usual heating system may be deter- Different matin supply and retii '2mmed;by using the pressure drop indicated by the longest main and riser on that system, valves, steam ^-neglecting the separate computations for each separate shorter run. and other spedilB vary as to cap*)" s- t jH^Return mains and risers are to be proporti.oned according to the equivalent therefore use ttii recommended fori-- -'."distance in feet, from farthest radiator to the vacuum pump; using capacities in particular mit( Columns (L to Q) for sizing entire return riser (Column J) and return Vertical connect! to be of same dal alve and trap'sal I main'(Cohimn K). 7'he return pipe sizes are conservative and are subject to revision ` completion of pending research investigations. Vi.Return horlioifi runout to be noil' f. than In. " * -..'-Qh-Where it is necessary to drip a supply main, supply riser or branch to a supply SaTMe should be dripped separately through a steam trap into vacuum return. * . ^riP a supply riser into a vacuum return, except through a steam trap. - 10.. Lift fittings. (See page 178). }}' Pitch of mains should be not less than X in- in 10 ft.; on horizontal branches to radiators and risers at least K in. in 10 ft. Copyright, 1927 ( A"EnicrN SociETror Heatino am Ventii.atino Enoinbem 1 Nor to be Renrinted Witfa- 1 HMm,> ani Conir^r, National A ttociatian ) ou t Specra/ permlsslon 172 173