Document evY9j9NJmJ2Zq841JNQkqkxNm

American Society of Heating and Ventilating Engineers Guide, 1930 Table 16. Pipe Sizes for Vacuum Pump 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 . Based on 8 02. Total Pressure Drop Pro 8ns In. 100 Ft AB Equivalent Length op Pro raoif Boxleb to Farthest Radiator, Including Main and Riser. (See Note 6.) Supply Main Dripped and Branches to Risers Dripped-- Steam and Condensate flowing in same direction. Maxihuh Capacities < 200 Ft C 300 Ft D 400 Ft B1 500 Ft. F 600 Ft. a 800 FL H 1000 Ft 1200 Ft Supply Risers Up-Feed Branches to Supply Risen and Radiators Not Dripped / JK Ll i 157 m 92 79 70 65 56 49 46 56 iy* 346 245 200 173 154 141 122 110 100 122. 26 58 IH 2 538 1091 380 771 310 630 269 240 220 190 165 155 190 95 546 487 446 386 345 315 386 195 2H 3 1797 3289 1270 2326 1036 1896 898 1645 803 1470 734 1342 635 1163 568 1040 518 635 948 1129 395 700 m 4 4913 6950 3474 4914 2838 4022 2457 3475 2196 3106 2006 2828 1737 2457 1552 2196 1419 1548 2011 2042 1150 1700 5 12,858 9092 7424 6429 5747 5250 4546 4062 3712 6 21,105 14,924 12,168 10,553 9433 8618 7462 6669 6084 ...... ~ 3150 ---- 8 43,934 31,066 25,364 21,967 19,638 17,935 15,533 13,880 12,682 10 80,171 56,689 46,288 40,085 35,836 32,730 28,345 25,334 23,144 -- -- 12 128,672 90,985 74,290 64,336 57,516 52,530 45,492 40,660 37,145 16 240,245 169,879 138,381 121,012 107,389 98,500 84,849 75,917 69,671 -- -- Pm Size Ikches Return Mains and Risers Riser Main 100 Ft. MN 0 *A Hl 1130 1977 l m 3390 m l)4 5370 1)4 2 11,300 2 2)4 18,925 m3 30,230 3 314 45,200 3)4 4 62,180 4 5 109,300 200 Ft P 800 .1400 2400 3800 8000 13,400 21,400 32,000 44,000 77,400 300 Ft Q 400 Ft R 653 1143 568 994 1960 3103 1704 2696 6533 10,940 5680 9510 17,460 15,190 26,130 22,710 35,950 31,220 63,200 - 54,920 500 Ft S 600 Ft 800 Ft. 1000 Ft 1200 Ft T U VW 505 462 400 358 326 884 810 700 626 ` 570 1515 2400 1387 2195 1200 1900 1073 1698 976 1547 5050 4622 4000 3575 3256 8460 7745 6700 ' 5990 5453 13,510 12,360 10,700 9565 8710 20,200 18,490 16,000 14,300 13,020 27,800 25,430 22,000 19,660 17,910 48,800 44,720 38,700 34,600 31,500 D 1 f.f erent makes of sup ply and return valves, steam traps and other special ties vary as to c a.p aclty , therefore use size as recom mended for any particular make.' Verti cal connec tion to be of same size as valve and trap used. Return horizontal runout to be not less than H in. 5 6 175,100 124,000 101,200 88,000 78,200 71,700 62,000 55,410 50,450 CoDvrloht 1927 / American Societt or Heating and Ventilatino Engineers ) Not to be Reprinted With- *** ' \ Healing and Piping Conlradort National Auociaiion j out Special Permission 358 Chapter 20--Piping for Steam Heating Systems INSTRUCTIONS FOR USING TABLE 16 1. Radiator branches more than 8 ft. in length should be one size larger than shown in Column L. 2. It is not generally considered good practice to greatly exceed 1 oz. drop in pressure in each 100 ft. equivalent length of run nor to exceed 1 lb. total pressure drop in any system. 3. These tables apply where pipes are properly reamed. No allowances for defective material or workmanship have been made. (Also see Tables 7 and 8). . 4. Capacities based on 14 lb. condensation per square foot per hour, equivalent radiation and actual diameter of standard pipe. 5. Extra length to be added to straight run of pipe, for various fittings and valves to determine equivalent length. (See Table 4). 6. 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 corresponding Columns (B to J) for sizing the entire run. For example: If the distance from boiler or source of supply to the farthest radiator on the longest main should be 300 ft., all mains are to be sized from Column D; if 400 ft., Column E; if 600 ft.. Column G. Supply 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 particular riser. Determine the distance to the. farthest radiator then use figures in corresponding Columns (B to J) for sizing each riser; providing the amount of radiation for that riser does not exceed amounts shown in Column K. Where riser capacities are found to be in excess of amoqnts shown in Column K, step up to necessary size indicated in that column. For example: If the distance from the boiler or source of supply to the farthest radiator on a supply riser is 300 ft., that riser is to be sized from Column D, providing the amount of radiation does not exceed the amount shown in Column K. If the amount exceeds that in Column K, use amounts shown in Column K for sizing that entire riser. If another riser taken from the same main as the one indicated is only 200 ft., this riser should be sized from Column C, providing the amount of radiation does not exceed that as shown in Column K. 7. The Guide Committee, 1930, after many check-tests, suggest that for practical purposes the pipe sizes on the usual heating system may be determined by using the pressure drop indicated by the longest main and riser on that system, neglecting the separate computations for each separate shorter run. 8. Return mains and risers are to be proportioned according to the equivalent distance in feet, from farthest radiator to the vacuum pump; using capacities in corresponding Columns (O to W) for sizing entire return riser (Column A0 and return main (Column N). The return pipe sizes are conservative and are subject to revision upon the completion of pending research investigations. 9. Where it is necessary to drip a supply main, supply riser or branch to a supply riser, same should be dripped separately through a steam trap into vacuum return. Never drip a supply riser into a vacuum return except through a steam trap. 10. Lift fittings. (See page 362). 11. Pitch of mains should be not less than 14 in. in 10 ft.; on horizontal branches to radiators and risers at least 14 in. in 10 ft. 12. In general it is desirable not to have a supply main smaller than 2 in. in diameter. When the supply main.is larger than 2)^ in. at the beginning, it is desirable that it shall not be smaller than 214 in. at the end. 359