Document gRZr6wjaNamQx1n9OE9zKV3G

American Society of Heating and Ventilating Engineers Guide, 1928 Table 4. Maximum Allowable Capacities of Up-Feed Risers for One-Pipe Low Pressure Steam Based on A. S. H. V. E. Research Laboratory Tests Pipe Sob A i' W. l 2" ' 2V? 3' 334" 4" Velocity Feet per Second Pressure Drop Ounces per 100 Ft. . B 14.1 17.6 20.0 23.0 26.0. 29.0 .31.0 32.0 c 0.68 0.66 0.66 0.57 0.54 0.48 0.44 0.39 Sc. Ft. Radiation D 45 98 152 288 464 799 1144 1520 Capacity B.Lu. per Hour E 10,961 23,765 36,860 69,840 112,520 193,600 277,000 368,000 Lb. Steamjter Hour F 11.3 24.5 38.0 72.0 116.0 199.8 286.0 380.0 Notel.--Above capacities should never be exceeded on one-pipe risers. Note S.--Capacities based on % lb. condensation per square foot equivalent radiation and actual diameter of standard pipe. Note 3.--All pipe should be well reamed and free from constrictions. Fittings should be up to size. (See Tables 18. 19 and 20.) Table 5. . Maximum Allowable Capacities of Up-Feed Risers for Two-Pipe Low Pressure Steam Based on A. S. H. V. E. Research Laboratory Tests Pipe Size Velocity Feet per Second Pressure Drop Ounce per 100 Ft. A r m* 134" 2" 234' 3" 334' 4' B 20 23 27 30 35 38 41 42 43 C 1.78 1.57 1.48 1.33 1.16 0.95 0.81 0.71 So. Ft. Radiation D 40 74 151 228 438 678 1129 1548 2042 Capacity B.t.u. per Hour Lb. Steam per Hour E 9550 F 10.0 17,900 18.45 36,500 55,20(1 106,100 164,100 . 37.65 57.0 109.5 169.4 273,500 282:2 375,500 495,000 387.0 510.5 Note 1.--Above capacities should never be exceeded on two-pipe risers. Note 8.--Capacities based on lb. condensation per square foot equivalent radiation and actual diameter of standard pipe. Note 9.--All pipe should be well reamed and free from constrictions. Fittings should be up to size. (See Tables 18, 19 and 20.) 96 Chapter III--Steam Heating Systems and Piping t b fi Length in Feet of Pipe to be Added to Actual Length of Run to Table o. Obtain Equivalent Length Size of Pips St'd. Elbow Side Outlet Tee Gate Valve Globe Valve Angle Valve Length in Feet to be Added in Run 4 2' 234" 5 . 7 16 20 3' 334' 10 12 26 31 4' 14 35 5" 18 44 6" 22 50 .7* 26 55 8* 31 63 9' 35 69 10" 39 76 12' 47 90 14" 53 105 2 18 3 25 3 33 4 39 5 45 7 57 9 70 10 82 12 94 13 105 15 118 18 140 20 160 9 12 16 19 22 28 32 37 42 47 52 63 72 Example of length in feet of pipe to be added to actual length of run. h--- --*-- NEASUREO LEN6TH. - 138,-0 *'6ATE VALtE. - 5,-0, 4~TELBOWS. - 56-0 ! EQUIVALENT LEN6TH - 193 -0' Table 7. Constants for Various Lengths and Initial Pressures Steam Pressure Gage Lb. Constant by Which to Multiply Capacity op any Pipe tor 1 Lb. Gage Steam Pressure to Obtain Capacity op Same Pipe pob Pres sure in Col. 1 Length op Pipe Ft. Constant by Which to Multiply Capacity op 100 Ft. Pipe to Obtain Capacity op Same Smcn Pipe With Same Pressure, and Length as Given in Col. A Col. 1 Col. 2 Col. A Col. B 0 1 2 5 10 15 20 30 40 50 60 75 ' 100 125 150 175 200 * 0.92 1.00 1.03 1.11 1.24 1.35 1.45 1.63 1.79 1.94 2.08 2.26 ' 2.54 2.79 3.02 3.23 3.44 20 40 60 80 100 120 140 160 180 200 250 300. 350 400 450 500 600 . 700 800 .. 900 1000 1400 97 2.240 1.580 1.290 1.120 1.000 0.912 0.841 0.793 0.741 0.710 . 0,632 0.578 0.538 0.500 0.477 0.447 0.407 0.378 0.3540,333 0.316 0.267 : -,