Document N2RxwV093z7V5w72Rra9ewjEg

IT able 43. Flow of Steam in Pounds per M inute through Standard Pipes and Pressure D rop n Pounds per 100 F t .- V elocity, 4000 ft. per M in u te * American Society of Heating and Ventilating Engineers Guide, 1926-27 66 t 00 2 2 NT - CM 5 * - P ip e I Size nches GAGE PRESSURE IN POUNDS PER SQUARE IN C H -S T A N D A R D PIPE o O OA o to Vco) *o to o to o - 50 100 125 150 175 0.340 , 2.733 1 0.597 1.610 0.381 3.100 , 0.668 1.803 1 0.420 3.384 0.737 1.990 1 0.518 4.180 j. 0.908 j 2.452 1 0.614 4.955 1.077 2.900 1 0,805 j 6.500 1.411 3.805 1 0.993 8.030 1.740 4.700 ' 1.270 10.25 1.727 13.93 2.175 17.54 2.620 21.22 2.225 1 6.000 1 3.029 1 3.814 1 4.593 8.190 1 10.29 12.37 3.072 24.82 5.382 14.53 >o o 'O --S 3.515 28.42 Flow Drop I Flow 1 Drop 0.968 1.061 '1.675 0.657 1.083 1.190 | 1.873 1 0.734 1.195 1.310 2.068 0.811 ' 1.473 1.516 2.548 1.000 1.746 1.913 3.023 1.185 2.287 2.492 j 3.958 ! 1.555 2.821 3.090 4.882 1.915 ! 3.608 3.956 6.241 2.448 4.908 5.385 4.490 3.330 6.182 6.775 7.448 8.165 ! 12.88 5.045 8.730 , 9.585 15.11 5.938 9.990 ; Flow 10.99 Drop 17.28 Flow 6.796 Drop 2.281 0.505 2.551 0.566 2.816 0.624 3.471 0.770 4.113 0.910 5.388 1.194' 6.650 1.472 8.500 1.883 11.57 2.564 14.457 3.222 17.56 3.889 20.56 4.555 23.53 Flow 5.222 Drop . 3.760 0.334 5.365 0.250 4.208 0.376 6.000 0.280 4.641 0.412 6.621 1 0.3C9 5.721 0.509 8.165 0.382 1 6.782 0.602 8.880 0.788 9.680 1 12.68 ! 0.452 0.592 j 10.96 0.976 15.64 0.713 14.02 1.243 19.06 1.690 24.02 2.160 28.92 2.562 20.00 1 27.20 34.26 1 1 41.28 0.933 1.270 1 1.598 ! 1.926 CoM fo 33.90 3.110 ! 38.80 3.448 55.35 2.585 Flow Drop ! Flow Drop 8.280 9.260 1.77 0.199 1 l 14.26 0.118 15.96 0.133 o o --< o 10.22 0.220 12.60 0.272 21.70 0.181 14.93 0.322 i 25.73 0.214 j 19.57 0.421 33.70 0.279 24.13 0.520 41.58 0.345 30.85 0.664 5 3 .IS 0.441 j 42.00 0.905 72.33 0.600 52.88 1.138 91.10 0.755 63.70 1.370 109.8 0.911 74.62 1.610 128.6 1.068 85.45 1.840 147.2 1.235 Flow Drop Flow Drop 22.43 25.08 0.085 . ; 0.096 27.68 0.106 34.12 0.130 40.45 , 0.154 52.96 65.32 83.60 0.202 | 0.249 | 0.318 113.7 0.433 143.2 0.546 172.4 0.656 202.2 0.768 231.3 Flow 0.883 Drop to. OCOt 32.36 0.066 36.22 0.074 So 49.25 0.101 58.38 0.119 76.48 0.156 94.30 0.193 120.7 0.247 164.2 0.336 206.7 0.422 249.0 0.508 291.8 0.597 334.0 Flow 0.683 Drop CM OCM. NO CO -- CM S7.30 0.045 64.10 0.051 70.72 0.056 87.15 0.069 103.4 0.082 135.4 0.107 166.9 0.131 365.9 0.287, 440.8 0.346 516.6 0.406 591.0 Flow 0.465 Drop u ro S 8Sf>` 90.40 0.034 101.1 0.038 128.6 143.8 0.027 ! 0.031 111.6 0.042 158.8 0.034 137.6 0.052 195.7 0.042 163.1 0,061 232.0 0.049 213.6 0.080 263.4 0.098 303.9 374.6 0.064 j 0.079 336.8 0.126 479.3 0.101 577.2 0.214 652.0 1 821.5 0.137 0.172 695.0 815.0 0.258 : 0.304 932.8 0.348 989.0 1159.0 ; 1 1327.0 0.208 | 0.280 | 0.313 Flow Drop Flow Drop *Courtesy Crane-Company. American Society of Heating and Ventilating Engineers Guide, 1926-27 . RESULTS OF LABORATORY EXPERIMENTS The Research Laboratory of the American Society Heating and Ventilating Engineers has investigated this subject1, and has found the critical velocity for quiet operation to be about 22 in. per second for the sizes of pipe investigated and apparently increasing with the size of pipe. The maximum velocity, however, with counter flow of condensate where noise is not objectionable is considerably higher and increases rapidly with size of pipe. In the case of horizontal runs both the critical velocity for quiet operation and the maximum velocity where noise is not objectionable, depend upon the pitch of the pipe. The maximum capacity and velocity where noise is not objectionable for horizontal pipes with various pitches are given in Table 44. Type *Jf IbuHom Entrance M u m | ber z_o_f Jj X IT Squared Errtranc lilt iil i i5 is i3 Beamed Bounded Sutqlc idledOfltkr Three 11 Diomd ter -Too AA g S'? 3 S i5 $ jg E a$ 1 . Suite A I V3 r3 w Vluared Entrance Reamed Entrance Rounpeo Entrance bNOLe^TratWrtu>rTe* w CO Q LToo TA B Fig. 22. Effect of Reaming Entrance to One-Pipe Risers The capacity of risers with various shaped entrances is very important and those shown in Fig. 22 gave the following maximum capacities:-- Reamed entrances................ ...........- 24.7 lb. per hr. Rounded entrances_______ ............. 23.9 lb. per hr. Squared entrances................ ............. 22.2 lb. per hr. Three wheel cutter............... ............. 19.2 lb. per hr. Single wheel cutter............... ............. 17.6 lb. per hr. Where the velocity of steam is the limiting factor of the capacity of a pipe, care must be taken that this velocity is'not exceeded in any part of Reports by Houghten & Ebin, Transactions. American Society of Heating and Ventilating Engineers, Vols. 28-32, inch 67 c Riser 4 at 1 Softoco AC B2 Point | Too SA IiBln1C t 1_______ 1a________ (2 B & |Ajig| 3 3 3 S 13 5 3I W IS ~spr n IsuNum 1 1 Too A c_ X X 2 33 bureau or mines OATcstrrtfc-te nrroauMM pa. c. Per Cent Decrease 0.0 3.2 10.1 22.2 28.7 wo.