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American Society of Heating and Ventilating Engineers Guide, 1928 IIIChapter --Steam Heating Systems and Piping Table 11. Pipe Sizes for One-Pipe, Gravity, Low Pressure Steam Heating Systems where Equivalent Length of Run from Boiler or Source of Supply to Farthest Radiator Exceeds 200 Ft. .Table 12 Pipe Sizes for Two-Pipe, Gravity, Low Pressure Steam Heating Systems wtoere Equivalent Length of Run from Boiler or Source of W Supply to Farthest Radiator Exceeds 200 Ft. Capacity in Sq. Ft. of Equivalent. Radiation ____________________________________________ Capacity in Sq. Ft. Equivalent Radiation Pipe . Size Inches Equivalent Length of Pipe pbom Boiler to Farthest Radiator, Including Main and Riser. (See Note 4.) Supply Main Dripped and Branches to Risers Dripped-- Steam and Condensate flowing in same direction. Based on 4 oz. Total Pressure Drop 100 Ft. 200 Ft 300 Ft. 400 Ft. 500 Ft 600 Ft. Mtxiutm Capacities Supply Risers Up-Feed Branches to Supply Risers and Radiators Not Dripped Vahesm Vertical ''OnRecUtu I Pipe Size Incbes .. T ror-in or Pd*b ebom Boiler to Farthest KtoTi-- Mao, *" -/Wj U S.mulv Main Dripped And Branches to Risers Drippcdh PSteam and Condensate Sowing in same direction Based on 4 or. Total Pressure Drop 100 Ft. 200 Ft. 300 Ft 500 Ft. 600 Ft. Maximum Capacities Supply Risers Up-Feed Branches to Supply Risers ana Radiators Not Dripped Rad. Supply Valves and Vertical Connections Radiator Return Valves and Connections K 1 . Ill m 245 ix 380 2 771 VA 1270 3 2326 3H 3474 4 4914 9092 14,924 79 173 269 546 898 1645 2457 3475 6429 10,553 65 141 220 446 734 1342 2006 2828 5250 8618 56 122 190 386 635 1163 1737 2457 4546 7462 49 110 165 345 568 1040 1552 2196 4062 6669 46 100 155 315 518 948 1419 2011 3712 6094 45 98 152 288 464 799 1144 1520 20 55 81 165 260 475 745 1110 2180 20 55 30 Vi Ill 79 65 56 49 46 56 26 81 165 lX 1X 245 380 173 269 141 220 122 190 110 165 100 155 122 190 2 771 2X 1270 546 898 446 734 386 635 345 568 315 518 386 635 58 95 195 395 3 i'A 2326 1645 3474 .2457 1342 2006 1163 1737 1040 1552 948 1419 1129 1548 700 1150 4914 3475 2828 2457 2196 2011 2042 9092 6429 5250 4546 4062 3712 1700 3150 30 56 122 190 386 122 190 386 8 31,066' 21,967 17,935 15,533 13,880 12,682 10 56,689 40,085 32,730 28,345 25,334 23,144 14,924 10,553 8618 7462: 6669 6094: 31,066 21,967 17,935 15,533 13,880 12,682 12 90,985 64,336 52,530 45,492 40,660 37,145 10 56 689 40,085 32,730 28,315 25,334 23,144 12 90]985 64,336 52,530 45,492 40,660 37,145 Drt Return Main Wet Return Main Pipe Dht Return Main Wet Return Main Size Inches Equivalent Length of Run from Boiler to Foot of Farthest Riser in Feet 100 200 300 400 500 600 Equivalent Length of Run from Boiler to Foor.-or 1 Farthest Riser in Feet. i 100 200 300 400 500 600 ! Pipe Size Incbes ' Equivalent Length op Run from Boiler to Farthest Radiator in Feet Equivalent Length op Run from Boiler to Farthest Radiator in Feet K h M N 0 P Q B S T U V. W | 100 200 300 400 500 600 100 200 300 400 500 600 M N' 0 P Q B S T U V W X Y i 460 412 368 320 322 275 1400 1000 820 700 640 580 1 IX 962 868 770 670 579 480 2400 1700 1390 1200 1080 990 j i 460 412 368 320 322 275 1400 1000 820 700 640 580 1512 1362 1210 1058 909 757 3800 2700 2180 1900 1710 1570 j IX 962 868 770 670 579 480 2400 1700 . 1390 1200 1080 990 2 3300 2960 2640 2300 1980 1630 8000 5600 4520 4000 3560 3240 [ ix 1512 1362 1210 1058 909 757 3800 2700 2180 1900 1710 1570 2 3300 2960 2640 2300 1980 1630 8000 5600 4520 4000 3460 3240 2X 5450 4900 4380 3800 3300 2770 13,400 9400 7600 6700 6000 5300 3 10,000 9000 8000 7000 6000 5000 21,400 15,000 12,500 10,700 9400 8500 2X 5450 4900 4380 3800 3300 2770 13,400 9400 7600 6700 6000 5300 3 10,000 9000 8000 7000 6000 5000 21,400 15,000 12,500 10,700 9400 8500 3X 14,300 12,900 11,500 10,000 8600 7200 32,000 22,000 18,500 16,000 14,400 13,200 ! 4 [21,500 19,300 17,200 15,000 12,900; 10,700 44,000 31,000 25,500 22,000 19,900 18,300 rymneidht toyn J Ambrican Societt op Heating and Ventilating Engineers \ Not to be Reprinted With- 3X 14,300 12,900 11,500 10,000 8600 7200 32,000 22,000 18,500 16,000 14;400 13,200 4 21,500 19,300 17,200 15,000 12,900 10,700 44,000 31,000 25,500 22,000 19,900 18,300 isopyngnt, vt/ ^ Heating and PipinQ Contractors National Association / out Special Permission Radiator branches more than 8 ft. in length should be one size larger than shown in Column 1. Convriflht 1927 / American Societt of Heating and Ventilating Engineers \ Not to be Reprinted With- s' \ Heating and Piping Contractors National Association J out Special Permission Note 1.--These tables apply where pipes are properly reamed. No allowances for defective material or workman ship have been made. (Also see Tables 18, 19 and 20). . Note .--Capacities based on lb. condensation per square foot equivalent radiation and actual diameter n standard pipe. , Note 8.--Extra length to be added to straight run of pipe for various fittings and valves to determine equivalent length. (See Table 6). - . , 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 0) for dry return mains; (12 to W) for wet return mains for sizing the entire run. Risers are to be proportioned according to the equivalent length of run from the boiler or source of supply to tu Radiator branches more than g ft. in length should be one size larger than shown in Column I. Note 1.--These tables apply where pipes are properly reamed. No allowances for defective material or workmanship have been made. (Also see Tables 18,1'9 and 20). Note l.--Capacities based on lb. condensation per square foot equivalent radiation and actual diameter of standard pipe. Note 8.--Extra length to be added to straight run of pipe for various fittings and valves to determine equivalent length. (See Table 6). Note 4--Mains we 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. .Dstayine equivalent length of run then use figures in that corresponding Column (B to G) for supply mains; (N to 5) for dry return (T to F) for wet return mains for siting 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 tarthesi radiator on each riser. farthest radiator bn each particular riser. Determine the distance to the farthest radiator then use the figures in the corresponding Column (B to G) for sizibi each riser; providing the amount of radiation for that riser does not exceed amounts shown in Column H. Where riser capacities are found to be in excess of amounts in Column H, step up to necessary size indicated in that column. I *--r -- unUL "AipizAj loci vaiMwua oic luuuu wj iu exetw w tuuuuuw guunu m vsukuuw u, step up to' necessary sue inuicatca in ,1 return risers determine the equivalent length of run in feet from the top of each riser to the boiler then use the figures Note 6.--Where it is necessary to drip a steam main, branch to riser or riser, same should be dripped separately' *" corresponding Columns (N to S) for airing each riser. into wet return. ,.. Note 5 --Whirc it is necessary to drip a supply main or a supply riser or a branch to a supply riser, same should drip separately into Note 6.--Pitch of pipe should be not less than # in. in 10 ft.; on horizontal branches to radiators at least H Is vet return. A drip for a- *tw--o----i- r-- system may be taken into a dry return through an adequate seal. in 10 ft. Note 8.--Pitch ofpipe should e'not less than M in. in 10 ft.; on horizontal branches to radiators, at least in. in 10 ft. 102 ins