Document karjVjNpy7XRdvJ41xrkNkjDb

American Society 0/ Heating and Ventilating Engineers Guide, 1930 Table 5. Pipe Sizes forTTnderground Supply Mains Based on a Velocity of '10,000 Ft. per Minute--(Continued) Oioi Pbessubi Lb. Lb. Steam per Minute 0 10 20 40 60 80 100 120 140 160 180 200 0 10 20 40 60 80 100 120 140 160 180 200 74.6 122 167 256 345 427 514 606 690 770 870 950 134 218 298 458 617 765 917 1080 1230 1375 1550. 1700 0 10 20 40 60 80 100 120 140 160 180 200 0 10 20 40 60 80 100 120 140 160 180 200 211 .345 474 730 983 1210 1455 1670 1960 2180 2470 2700 . 297 485 664 1020 1372 1700 2040 2410 2750 3060 3460 3800 Total B.t.xj. above 200 Deq. Faer. pbb TTr Pipe Loss B.t.u, pee Hour, feb Ft. Length Bare Covered (10% of Bare) Lb. Steam Condensed peb Hotjb Feb Ft. Length 6 in. Pipe 4,504,000 7,260,000 10,020,000 15,360,000 20,880,000 26,040,000 31,440,000 37,260,000 42,480,000 47,400,000 53,700,000 58,800,000 8 in. Pipe 7,980,000 12,960,000 17,940,000 27,540,000 37,560,000 46,680,000 56,160,000 66,480,000 75,300,000 84,600,000 95,400,000 105,600,000 585 719 852 1037 1186 1311 1428 1528 1620 1694 1785 1872 760.7 936.7 1109.5 1351 1543 1707 1859 1988 2107 2207 2325 2443 58.5 . 71.9 85.2 104 119 131 143 153 162 169 178 187 0.0604 0.0755 O.OQIft 0.1133 0.132Q 0.1d7(> 0.163Q 0.1760 O.lftSO o.ioko 0.2110' 0.2230 76.1 93.7 110.9 135.1 154.3 170.7 185.9 198.8 210.7 220.7 232.5 244.3 0.07R.S 0.0985 0.118 0.U7 0.171 0 101 0.212 0.220 0.744 0.238 0 275 0.291 10 in. Pipe 12,420,000 19,520,000 28,380,000 43,860,000 59,760,000 73,800,000 89,100,000 102,600,000 120,600,000 134,400,000 152,400,000 166,800,000 949 1170 1384 1685 1927 2132 2322 2486 2635 2755 2903 3051 IB in. Pipe 17,460,000 28,860,000 39,900,000 62,100,000 83,400,000 103,800,000 124,800,000 148,200,000 169,200,000 182,400,000 213,600,000 235,200,000 1125 1387 1641 1999 2240 2529 2753 2945 3121 3266 3440 3616 426 94.9 117.0 138.4 168.5 192.7 213.2 232.2 48.6 263.5 275.5 290.3 305.1 112.5 138.7 164.1 199.9 224.0 252.9 275.3 294.5 312.1 326.6 344.0 361.6 0.0978 0.1230 0.1480 0.1840 0.2130 0.2390 0.264 0.286 0.306 0.323 0.343 0.364 0.116 0.146 0.175 0.218 0)248 0.284 0.314 0.340 0.362 0.383 0.406 0.430 \ Chapter 25--District Heating Example:. Find the weight of steam at 100 lb. initial gage pressure, which will pass through a 6 in. pipe 720 ft. long with a pressure drop of 4 lb. Under the conditions assumed in the table, 287 lb. would flow per minute; hence, Q = 287 and Table 6. Flow of Steam Through Pipes Length of Pipe = 240 Diameters & " a % 1.0 IH 5s 3 Diameter of Fife in Inches 2.0 2H 3.0 4.0 5.0 6.0 6.0 10.0 12.0 15.0 13.0 Density* Weight of Steam peb Minute in Pounds with One Pound Loss in Pressure 1 1.13 2.04 5.49 9.85 14.8 24.4 45.0 74.2 105 202 329 482 771 1127 0.0385 10 1.39 2.54 6.82 12.3 18.5 30.3 55.9 92.3 138 248 409 599 958 1404 0.0595 20 1.63 2.98 8.02 14.4 21.9 35.6 65.7 108 163 295 481 705 1128 1645 0.0823 30 1.84 3.37 9.07 16.2 24.5 40.2 74.1 122 183 333 542 795 1272 1858 0.1047 40 2.03 3.71 9.95 17.9 26.9 44.2 81.6 135 202 366 596 874 1388 2089 0.1267 50 2.19 4.02 10.8 19.4 29.2 47.9 88.3 146 219 397 646 948 1515 2214 0.1486 60 2.35 4.30 11.5 20.7 31.2 51;3 93.7 156 234 424 691 1014 1623 2372 0.1703 70 2.50 4.56 12.3 22.0 33.1 54.4 100 166 248 451 734 1075 1722 2517 0.1919 80 2.63 4.81 12.9 23.2 34.9 57.4 106 175 262 475 774 1135 1814 2653 0.2134 90 2.76 5.05 13.6 24.3 36.6 60.2 111 183 275 499 812 1192 1893 2782 0.2347 100 2.88 5.27 14.2 25.4 38.3 62.8 116 191 287 520 848 1243 1990 2908 0.2560 120 3.10 5.69 15.3 27.4 41.3 67.9 125 207 310 562 915 1342 2148 3138 0.2985 150 3.38 6.26 16.8- 30.2 45.5 74.7 138 228 341 619 1007 1477 2361 3450 0.3616 200 3.88 6.96 19.1 34.3 51.5 84.8 156 258 387 703 1144 1677 2685 3919 0.4664 250 4.33 7.86 21.1 37.9 57.1 93.7 173 285 428 776 1264 1855 2962 4337 0.5695 300 4.68 8.56 23.0 41.2 62.1 102 188. 310 466 845 1376 2019 3226 4717 0.6748 350 5.03 9.22 24.7 44.5 66.8 110 202 334 501 908 1478 2168 3467 5060 0.7788 From Marks' and Davis' Tables. HEATING CONDUITS Conduits for steam pipes buried underground should be water-proof, able to withstand earth loads and take care of the expansion and con traction of the piping without strain or stress on the couplings, also without affecting the installation or conduit. Expansion of the piping must be carefully controlled by means of anchors and expansion joints or bends so that the pipes can never come in contact with the conduit. Anchors can be anchor fittings or U-shaped steel straps which partially encircle the pipes and are firmly bolted to a short length of structural steel set in concrete. In laying out conduits of this type the following points should be borne in mind: 1. The conduit should be laid out in successive straight runs between manholes or anchor pits. - 2. An anchor should be placed wherever the line changes direction. 427