Document e7Yq9BVdjNGmBJpKXZaoD81xE

American Society of 'Heating' and Ventilating Engineers Guide, 1932 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 Sg. Ft. of Equivalent Radiation Based on 8 oz. Total Pressure Drop Pipe Size In. 100 Ft. AB Equivalent Length op Pipe prom Boiler to Farthest Radiator, Including Main and Riser. (Seetfofed.) Supply Main Dripped and Branches to Risers Dripped-- Steam and Condensate Sowing in same direction. - Maximum Capacities 200 FL c 300 Ft D 400 Ft E 500 Ft. F 600 Ft. a 800 Ft. H 1000 Ft. / 1200 Ft. J Supply. Risers Up-Feed Branches to Supply Risen ana Radiators Not Dripped K J> i 157 111 92 79 70 65 56 49 46 56 m 346 245 200 173 154 141 122 110 100 122 26 58 IK 538 380 310 269 240 220 190 165 155 190 2 1091 771 630 546 487 446 386 345 315 386 95 195 234 1797 3 3289 1270 2326 1036 1896 898 1645 803 734 635 568 1470 1342 1163 1040 518 635 948 1129 395 700 3>4 4913 4 6950 3474 4914 2838 4022 2457 3475 2196 2006 1737 1552 1419 1548 3106 2828 2457 2196 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 -- -- ___ Return Mains and Risers Riser Main 100 Ft. MN 0 Vi 1130 i . 1977 l lK IK m IK 2 2 2K 3390 5370 11,300 18,925 2K 3 30,230 3 3K 45,200 3K 4 62,180 4 5 109,300 200 Ft P 300 Ft. Q 400 Ft. R 500 Ft. S 600 Ft T S00 Ft. 1000 Ft 1200 Ft. U VW 800 653 568 505 462 400 358 326 1400 1143 994 884 810 700 626 570 2400 . 3800 1960 3103 1704 2696 1515 1387 1200 1073 976 2400 2195 1900 1698 1547 8000 6533 5680 . 5050 4622 4000 3575 3256 13,400 10,940 . 9510 8460 7745. 6700 5990 5453 21,400 ; 17,460 15,190 13;510 12,360 10,700 9565 8710 32,000 26,130 22,710 20,200 18,490 16,000 14,300 13,020 44,000 35,950 31,220 27,800 25,430 22,000 19,660 17,910 77,400 63,200 54,920 48,800 44,720 38,700 34,600 31,500 Different makes of sup ply and return valves, steam traps and other special ties vary as to capacity, therefore use size as recom mend e.d 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 X In. 5 6 175,100 124,000 101,200 88,000 78,200 71,700 62,000 55,410 50,450 -, . . 10-- / American Societt or Heating and Ventilating Engineers \ Not to be Reprinted With- U>pyngnt, Vf! | Heating and Piping Contractor! National Association / out Special Permission 158 Chapter 9--Steam Heating. Systems and Pipe. Sizes INSTRUCTIONS FOR USING TABLE 16 ai. 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 34 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 amounts 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. For practical purposes the pipe sizes on the usual heating system may be deter mined 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 M) and return main (Column AT). 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 161). 11. Pitch of mains should be not less than 34 in. in 10 ft.; on horizontal'branches to radiators and risers at least J4 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 234 in. at the beginning, it is desirable that it shall not be smaller than 234 in. at the end. 159