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American Society of Heating and Ventilating Engineers Guide, 1929 Table 15. Pipe Sizes for Two-Pipe VaporI Heating Systems, where Equivalent Length of Run from Boiler or Source of Supply to Farthest Radiator Exceeds 200 Ft. Capacity in Sq. Ft: Equivalent Radiation PlPB Size Inches Equivalent Length of Pipe from Boiler to Farthest Radiator, Including Main and Riher. (See Note 4.) Supply Main Dripped and Branches to Risen Dripped-- Steam and Condensate flowing in same direction. Based on 2 ox. Total Pressure Drop 100 Ft. 200 Ft. 300 Ft. 400 Ft Supply Risen Up-Feed Maximum Capacities Branches to Supply Risen and Radiators Not Dripped A B C D B F G H v* 30 1 79 56 46 39 56 190 26 450 ik 173 122 100 87 122 m 269 190 155 134 190 58 990 95 1500 2 546 386 315 273 386 va 898 635 518 449 635 195 3000 395 3 1645 3A 2457 1163 1737 948 1419 822 1228 1129 1548 700 1150 -- 4 3475 2457 2011 1738 5 6929 4546 3712 3214 6 10,553 7462 6094 5276 8 21,967 15,533 12,682 10,983 10 12 Pm Inches 40,085 64,336 23,345 45,492 23,144 37,145 20,043 32,168 Dry Return Main Equivalent Length of Run from Boiler to Farthest Radiator in Feet 100 200 300 400 2042 1700 -- 3150 -- supply and return valves, steam traps and other specialties vary as to capacity. therefore use size as recommended for any particular make. Vertical connections to be of same size zontal runout to be not less than % In. Wet Return Main Equivalent Length of Run from Boiler to Farthest Radiator in Feet 100 200 300 400 /J 1 355 1M 745 m 1173 2 2680 K 320 670 1058 2300 L 285 595 943 2140 M 248 520 822 1880 N 1000 1700 2700 5600 0 700 1200 1900 4000 P 580 . 990 1570 3240 Q 500 850 1350 2800 m 4300 3 7800 3800 7000 3470 6250 3040 5480 9400 15,000 6700 10,700 5300 8500 4700 7500 3A 11,100 10,000 4 16,700 . 15,000 8800 13,400 7880 11,700 22,000 31,000 16,000 22,000 13,200 11,000 18,300 15,500 rvwkwtAk* o'rt / American Societt or Heating and Ventilating Engineers \ Not to be Reprinted With- uopyngnr, iva/ | Heating and Piping Contractor> National Auociation ) out Special Permission Radiator branches more than 8 ft. in length should be one use larger than shown in Column 0. fThis table is for systems which are open to atmosphere or operate under slight pressure or partial vacuum without use of vacuum pumps. Note l.--These tables apply where pipes are properly reamed. No allowances for defective material of workmanship have been made. (Also see Tables 8 and 9). Note t.--Capacities based on X lb. condensation per square foot per hour equivalent radiation and actual diameter of standard pipe. Note S.--Extra length to be added to straight run of pipe for various fittings and valves to determine equivalent length. (See Table 4). Note 4.--Mains are to be proportioned according to the equivalent length of run from the boiler or source of supply to the farthest radiators supplied by the main. , Determine equivalent length of run then use figures in that corresponding Column (B to B) for supply mains; (J to Af) for dry return mains; (N to Q) for wet return mains for sizing the entire run. Supply and return risers are'to be proportioned according to the equivalent length of. run from the boiler or source of supply to the farthest radiator on each riser. For supply risers determine the distance from the boiler to the farthest radiator served by that riser then use the figures in tile corresponding Column (R to E) for suing each supply riser; providing the amount of radiation for that riser does not CToeed amounts shown in Column F. Where supply riser capacities are found to be in excess of amounts shown in Column F, step up to necessary rise indicated in that column. For return risen determine the equivalent length of run in feet from the top of each riser to the boiler then use the figures in the corresponding Columns (J to M) for sizing each riser. Note 6.--Where it is necessary to drip a supply main or a supply riser or a branch to a supply riser, same should drip separately into a wet return. The drip for a vapor or vacuum system may be taken into a dry return through a steam trap. Note 0.--Pitch of mains should be not less than X in. io 10 ft; on horizontal branches to radiaton and risen at leasts in. in 10 ft 109 IIIChapter --Steam Heating Systems and Piping Table 16. Pipe Sizes for Two-Pipe VAPORt Heating Systems, where Equivalent Length of Run from Boiler or Source of Supply to Farthest Radiator Exceeds 200 Ft. Capacity in Sq. Ft. of Equivalent Radiation Pm Sob Inches A % 1 lK 1A Equivalent Length op Pipe from Boiler to Farthest Radiator. Including Main and Riser. (See Note 4.) 100 Ft Steam anc Condensate flowing in same direction, Based on 4 oz. Total Pressure Drop 200 Ft 300 Ft 400 Ft 500 Ft 600 Ft BCDB FG .... in 79 65 56 '49 46 245 173 141 122 no 100 380 269 220 190 165 155 Maximum Capacities Supply Risen Branches to Supply Risen Up-Feed Not Dripped Return Risen a / / 30 190 56 26 450 122 58 990 190 95 1500 2 771 546 446 386 345 315 386 195 3000 2A 1270 898 734 635 568 518 635 395 -- 3 3A 2326 3474 1645 2457 1342 2006 . 1163 1737 1040 1552 948 1129 1419 1548 700 1150 -- 4 4914 3475 2828 2457 2196 2011 2042 1700 5 9092 6429 5250 4546 4062 3712 -- 3150 -- 6 14,924 10,553 8618 7462 6669 6094 Different makes of supply and retorn valve*, steam traps and ether specialties 8 31,066 21,967 17,935 15,533 13,880 12,682 vary as to capacity, therefore nse rise as recommended for any particular --L* 10 12 56,689 90,985 40,085 64,336 32,730 52,530 28,345 45,492 25,334 40,660 23.144 37.145 Vertical connections to be of same size as valve and trap esed. Return hori zontal moot to he not less than X in. Drt Return Main Wet Return Main Inches K Equivalent Length of Run from Boiler TO Farthest Radiator in Feet 100 200 300 400 500 600 LMN0 P 0 Equivalent Length of Run from Boiler Farthest Radiator in Feet 100 200 300 400 500 B8 TUV 600 W 1 460 412 368 320 275 227 1400 1000 820 700 590 480 IK 962 868 770 670 579 480 2400 1700 1420 1200 1020 860 iA. 1512 1362 1210 1058 909 757 3800 2700 2260 1900 1560 1300 2 3300 2960 2640 2300 1980 1630 8000 5600 4500 4000 3360 2800 2A 5450 4900 4380 3800 3300 2770 13,400 9400 7600 6700 5700 4800 3 10,000 9000 8000 7000 6000 5000 21,400 15,000 12,300 10,700 9300 7800 3A 14,300 12,900 11,500 10,000 8600 7200 32,000 22,000 24,000 16,000 13,600 11,400 4 21,500 19,300 17,200 1$,000 12,900 10,700 44,000 31,000 26,000 22,000 20,500 15,400 Copyright 1927 / American Societt or Heating and Ventilating Engineers 1 Not to be Reprinted With- VJ K \ Heating and Piping Coniracton National Aeeodalion J out Special Permission *Rsdistor branches more than 8 ft. ill length should be one eize larger than Bhoim in Column /. tThis table is for systems which are open to atmosphere or operate under slight pressure or partial vacuum without use of vacuum pumps. Note t.--These tables apply where pipes are properly reamed. No allowances for defective material or workmanship have been (Abo see Tables 8 and 9). Note t.--Capacities based on X lb. condensation per square foot per hour equivalent radiation and actual diameter of standard pipe. Note S.--Extia length to be added to straight run of pipe for various fittings and valves to determine equivalent length. (See Table 4). Note 4.--Mains are to be proportioned according to the equivalent length of run from the boiler or source of supply to the farthest radiators supplied by the main. Determine equivalent length of run then use figures in that corresponding Column (B to G) for supply mains; (L to Q) for dry return mains; (R to W) for wet return m&inn for wring the entire run. Supply and return risers are to be proportioned according to the equivalent length of run from the boiler or source of supply to the farthest radiator on each riser. Fat supply risers determine the distance from the boiler to the farthest radiator served by that rise- then use the figures in the corre sponding Column (B to G) for sizing each supply riser; providing the amount of radiation for that riser does not exceed amounts shown in Column H.' Where supply riser capacities are found to he in excess of amounts shown in Column H, step up to necessary rise indicated in that column. For return risen detemine the equivalent length of run in feet from the top of each riser to the boiler then use the figures 10 the corresponding Columns (L to Q) for airing each riser. Note 6.--Where it is necessary to drip a supply main or a supply riser or a branch to a supply riser, same should drip separately into a wet return. The drip for a vapor or a vacuum system may be taken into a dry return through a steam trap. Note 6.--Pitch of mains should be not less than X ia. in !0 ft.; on horizontal branches to radiators and risen at least M in* In 10 ft.