Document XV4Y5Ok57nXbDLo36km7nxrB

American Society of Heating and Ventilating Engineers Guide, 1930 422 F ig . 3. T ypical Service nstallatio nI Chapter 25--District Heating Table 3. Capacity of Returns for Underground Distribution Systems in Pounds of Condensate per Hour Sax* ]K. 1 m 2 3 4 5 6 8 10 12 6' 448 1740 2700 4980 13900 30900 54800 90000 190000 344000 555000 Pitch or Pxfb feb 100 Ft. 1' 998 2490 4190 7380 22500. . 44800 79800 138000 277000 498000 798000 V 1890 3990 5740 10700 30900 64800 120000 187000 404000 724000 1148000 3' 2240 4880 7480 13900 37400 79700 144800 237000 508000 900000 1499000 5' 3490 6480 9480 16900 50400 105000 195000 312000 660000 1190000 1990000 10' 5490 9480 14500 24900 74800 154000 294000 449000 938000 ______ -- 20' 7490 13500 20900 36900 105000 229000 418000 _...___ ____ .................... -- Size of pipe should be increased if same carries any steam. Table 4. Steam Requirements of Buildings from Outside Mains in Pounds of Steam per Hour So. Ft. turn 0 200 400 500 750 1000 2500 5000 7500 10000 12500 15000 20000 25000 30000 40000 50000 75000 100000 125000 150000 175000 200000 61.8 123.6 154.5 232 309 774 1545 2320 3090 3865 4640 6180 7740 9290 12380 15450 23200 30900 38650 46400 54200 61800 Steam Pbessube or Sebticb Main Lb. Gags 10 20 61.2 122.5 153 230 306 765 1530 2300 3060 3820 4590 6120 7650 9180 12250 15300 22800 30600 38300 45900 53600 61200 60.8 121.6 152 228 304 760 1520 2280 3040 ' 3800 4560 6080 7600 9120 12160 15200 22800 30400 38000 45600 53200 60800 60 59.8 119.6 149.5 224 299 747 1495 2240 2990 3740 4480 5980 7470 8970 11960 14950 22400 29900 37400 44800 52300 59800 100 59.4 118.8 148.4 223 297 743 1485 2230 2970 3720 4460 5940 7430 8910 11880 14850 22300 29700 37200 44600 52000 59400 140 59.2 118.4 148 222 296 740 1480 2220 2960 3700 4440 5920 7400 8890 11840 14800 22200 29600 37000 44400 51800 59200 180 200 59.0 118.0 147.5 221 295 737 1475 2210 2950 3690 4420 5900 7375 8850 11800 14740 22100 29500 36900 44250 51600 59000 58.8 118.0 147 220 294 735 1470 2200 2940 3680 4410 5880 7350 8830 11780 14700 22000 29400 36800 44100 51400 58900 Each square foot of radiation transmits 250 B.t.u. per hour. Table for steam entering buildings at stated pressures then reduced to required amount and condensed in radiator to water at 212 deg. fahr. 0 pressure. The above table also allows 20 per cent for piping loss in the building. The offset lengths which are required for expansion in the case of wrought iron pipe may also be used for brass pipes, using in each case the actual amount of expansion in the piping. 423