Page 122 - APPLIED PROCESS DESIGN FOR CHEMICAL AND PETROCHEMICAL PLANTS, Volume 1, 3rd Edition

Table 2-12A
Flow of Air Through Schedule 40 Pipe*
(Use for estimating; for detailed calculations use friction factors, f)
For lengths of pipe oth er than Free Air ·- ·- ·-·--- Pressure Drop of Air
Com-
100 feet, the pressure drop is q'm
proportional to the length. pressed Air In Pounds per Square Inch
Thus, for 50 feet of p ipe, the Cubic Feet Cubic Feet Per 100 Feet of Schedule 40 Pipe
pressure drop is approx imately Per Minute Per Minute For Air at I 00 Pounds per
one-half the value give nin the at 60 F and at 60 Fand Square Inch Gauge Pressure
table ... for 300 fee t, three 14.7 psia 100 psig and 60 F Temperature
times the given value , etc.
The pressure drop is also in- Ys' 1.1c• :Ya" 112' I
versely proportional to the 1 0,118 0,361 0.083 0.018
absolute pressure and directly l 0.156 1.31 0.185 0.064 0.020
.proportional to the absolute 3 0.384 3,06 0.605 0.133 0.042 3,4"
temperature. 4 0.513 4.83 1.04 O.ll6 0.071 0.017
0.641
0.343
0.106
1.58
7.45
5
Therefore, to determ ine the 6 0.769 10.6 2.13 0.408 0.148 0.037 1 ...
pressure drop for inlet or aver- 8 l.OlS 18,6 3.89 0.848 0.155 0.061 0.019
age pressures other t han 100 10 l.l8l 28.7 5.96 1.16 0.356 0.094 0.029 11/c" 1112·
...
l.9ll
15
13.0
psi and at temperatur es other 20 l.563 ... za.s l.73 0.834 O,lOI 0.062 0.026
1.43
4.76
0.345
0.101
than 60 F, multiply th evalues
given in the table by t he ratio: 25 3,204 ... 35.6 10.5 l.ll o.748 0.156 0.039 0.019
7.34
0.516
...
...
30
0.119
3.15
3.845
0.055
0.026
+t)
4.486
(JOO+ 14.7)( � 35 5,116 ... ... 14.l 4.14 1.00 0.293 0.073 0.035
...
...
18.4
0.379
40
5.49
P+ 14.7 5 20 45 5.767 ... ... 23.1 6.90 1.30 0.474 0.095 0.044 2'
1.61
0.055
0.116
where: 50 6.408 28.5 8.49 1.99 0.578 0.149 0.067 0.019
60
0.094
"P" is the inlet or average 70 7.690 2W 40.7 12.2 l.85 0.819 0.200 0.116 0.027
...
8.971
1.10
3.&3
16.5
0.036
0.270
gauge pressure in pound s per 80 10,25 0.019 ... ll.4 4.96 1.43 0.350 0.162 0.046
square inch, and, 90 11,53 0.013 ... 17.0 6.15 1.80 0.437 0.103 0.058
100
"r" is the tempera ture in 115 12.81 0.029 3" 33.2 7.69 l.21 0.534 0.247 0.070
...
16.02
degrees Fahrenhei t under 150 19.21 0.044 0.021 ... 11.9 3.39 0.815 0.380 0.107
17.0
0.151
1.17
o.537
0.062
4.87
consideration. 175 22.43 0.083 0.028 ... 23,1 6.60 1.58 0.727 0.205
200 lS.63 0.107 0,036 3lf2" ... 30,0 8.64 l.05 0.937 0.164
The cubic feet perm lnute of llS 28.84 0.134 0.045 0.022 37.9 10.8 2.59 1.19 0.331
compressed air at an y pres- :2SO 31.04 0.164 0.055 0.017 ... 13.3 3.18 1.45 0.404
...
1.75
sure is inversely propo rtional :275 35.14 0.191 0.066 O,OJl ... 16.0 3.83 l.07 0.484
38,45
0.078
O,l3l
300
0.037
19.0
4.56
0.573
to the absolute press ure and 315 41.65 0.170 0.090 0.043 ... 12.3 5.32 l.4l 0.673
directly proportional to the 4"
absolute temperature 350 44.87 0.313 0.104 0.050 ... 15.8 6.17 l.80 0.776
...
375 48.06 0.356 0.119 0.057 0.030 29.6 7.05 3.lO 0,887
To determine the cu bic feet 400 51.16 0.401 0.134 0.064 0.034 ... 33.6 8.02 3.64 1.00
...
425
54.47
0.451
37.9
0.038
9.01
1.13
4.09
0.151
0.072
per minute of compressed air 450 57.67 0.507 0.168 0.081 0.042 ... . .. 10.2 4.59 1.26
at any temperature an d pres-
sure other than stand ard con- 415 60.88 0.561 0.187 0.089 0.047 ... 11.3 5.09 1.40
...
O.l06
0.051
1.55
12.5
0.099
5.61
0.613
64.08
500
ditions, multiply the value of 550 70.49 0.749 0.148 0.118 0.061 ... 6.79 1.87
15.1
cubic feet per minut e of free 600 76.90 0.887 0.193 0.139 0.073 ... I 18.0 8.04 l.ll
air by the ratio: 650 83.30 1.04 0.341 0.163 0.086 5" ... 21.1 9.43 l.60
( 14.7 )(460 t) 700 89.71 1.19 0.395 0.188 0.099 0,032 24.3 10.9 3.00
ss.n
14.7+P -n- 750 101.5 1.36 0.451 0.114 0.113 0.036 27.9 ll.6 3.44
0.513
0.144
0.127
800
14.l
31.8
3.90
I.55
0.041
850 108.9 1.74 0.576 0.274 0.144 0.046 35.9 16.0 4.40
900 115,3 1.95 0.641 0.305 0.160 0.051 6" 40.2 18.0 4.91
950 1:21.8 l.18 0.715 0.340 0.178 0.057 0.023 ... 20.0 5.47
l 000 118.l l.40 0.788 0.375 0.197 0.063 0.025 ... 22.1 6.06
1100 141.0 l.89 0.948 0.451 0.136 0.075 0,030 ... 16.7 7.19
1 lOO 153.8 3.44 1.13 0.533 0.179 0.089 0.0351 ... 31.8 8.63
1300 166.6 4.01 1.31 0.616 0.317 0.103 0.041 ... 37.3 10,1
1400 179.4 4.65 1.51 0.718 0.377 0.119 0.047 11.8
,,. 1500 105.1 5.31 1.74 0.8l4 0.431 0.136 0.054 8" 13.5
192.2
6,04
1.97
1600
0.490
0.931
0.061
0.154
15.3
1800
Calculatlon1 for P :2000 130.7 7.65 l.50 1.18 0.616 0.193 0.075 19.3
256.3
9.44
Other than Schedu ,. 40 3.06 1.45 0.757 0.237 0.094 0.023 10" 13.9
:2500 310.4 14.7 4,76 l.25 1.17 0,366 0.143 0.035 37.3
384.5
To determine the ve loci% of 3000 448,6 21. l 6.81 3.lO 1.67 0.5l4 0.104 0.051 0.016
9,23
3 500
l.26
0.709
water, or the pressu re rop 4000 511.6 28.8 ll.l 4.33 l.94 0.919 0.176 0.068 0.021
0.358
0.028
5.66
0.088
37.6
of water or air, throu gh pipe 4500 576.7 47.6 15.3 7.16 3.69 1.16 0.450 0.111 0.035 12#
other than Schedule 40, use ...
8.85
the following formula s: 5000 640,8 ... 18.8 12,7 4.56 1.41 0.552 0.136 0.043 0.018
27.1
0.061
769,0
2.03
6.57
0.794
0.195
6000
0.025
...
8.94
v4 = v40 (_�o ) 2 7000 1025 ... 36.9 17.2 14.9 2.76 1.07 0.262 0.082 0.034
897.1
. ..
8000
0.339
0.107
1.39
0.044
11.7
3.59
22.5
...
. ..
1153
9000
0.055
0.427
1.76
0.134
4.54
28.5
or
2.16
0.526
...
AP,.= AP,o( i 10000 1282 ... ... 35.2 18.4 5.60 2.62 0.633 0.164 0.067
11000
. ..
0.197
0.081
1410
22.2
6.78
12000 1538 ... ... . .. 26.4 8.07 3.09 0.753 0.234 0.096
0.273 e.m
...
...
...
9.47
Subscript "a" refers to the 13 000 1666 ... . .. ... 31,0 11.0 3.63 0.884 0.316 0.129
HODO
4.21
36.0
1.02
1794
Schedule of pipe through 15000 19l2 ... ... ... .. .
which velocity or p ressure 16 000 2051 ... . .. ... . .. ll.6 4.84 1.17 0.364 0.148
0.167
5.50
14.3
1.33
0.411
drop is desired. 18 000 2307 ... ... ... . .. 18.2 6.96 1.68 0.520 0.213
:20000 2563 ... ... ... ... 22.4 8.60 2.01 0.642 0.160
Subscript "40" refer s to the l:2000 2820 ... ... ... . .. 27.1 10.4 2.50 0.771 0.314
velocity or pressu re drop ... ... ... ...
32.3
through Schedule 40 pipe, as :24000 3076 ... ... ... ... 37.9 12.4 2.97, 0.918 0.371
:?6000
3332
1.12
14.5
0,435
3.49
given in the tables on these 28 000 3588 ... ... ... . .. ... 16,9 4.04 1.25 o.505
facing pages. 30000 3845 ... ... I ... . .. ... 19.3 4.64 1.42 0.520
*By permission Technical Paper No. 410, Crane Co., Engineering Div., Chicago, 1957.