Document G5v3J6bDMaq8vvexvVvbnRx94

American Society of Heating and Ventilating Engineers Guide, 1929 206 F ig . 1. St e a m Se r v ic e a n d M e t e r C o n n e c t io n s w it h C o o l in g R a d ia t o r Chapter XI--Central Heating Systems Table 3. Capacity of Returns for Underground Distribution Systems in Pounds of Condensate per Hour , Size* or Pipe In. i lM 2 3 4 5 6 8 10 12 6' 448 1740 2700 4980 13900 30900 54800 90000 190000 344000 555000 r 998 2490 4190 7380 22500 44800 79800 138000 277000 498000 798000 Pitch or Pipe per 100 Ft. 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. TION 0 200 61.8' 400 123.6 500 154.5 750 232 1000 309 2500 774 5000 1545 7500 2320 10000 3090 12500 3865 15000 4640 20000 6180 25000 7740 30000 9290 40000 12380 50000 15450 75000 23200 100000- "30900 125000 38650 150000 46400 175000 54200 200000 61800 Steam Pressure or 8ehvice Main Lb. Gags 10 ` 61.2 122.5 153 230 306 765 1530 2300 3060 3820 4590 6120 7650 9180 12250 15300 22800 30600 38300 45900 53600 61200 20 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. strain put in the line at the time of installation. This allows for only 60 per cent of all expansion to be taken care of by expansion joints, offsets or bends. Table 2 gives the length of pipe that should be made up to provide for the expansion. In general the arms should be made up with pipe bends which can be welded into one continuous length. 207