Page 120 - 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 other than Free A~ Com- Pressure Drop of Air
100 feet, the pressure drop is n'
roportional -to the length. wm ressed& In Pounds per Square Inch
hus, for 50 feet of pipe, the Cubic Feet bbic Feet Per 100 Feet of Schedule 40 Pipe
presshe drop is approxhately Per Minute 'er Minute For Air at 100 Pounds per
one-half the value given in the at 60 F and t 60 F and Square Inch Gauge Pressure
table . . . for 300 feet, three 14.7 psia 100 psig - - __ - - - - -
and 60 F Temperature
__. - -
-
-
-
times the given value, etc. - - - -
The pressure drop is also in- w '/s 3/s" YZn
versely proportional to the 1 0.128 0.361 0.083 0.018
absolute pressure and directly 2 0.256 1.31 0.285 0.064 0.020
.proportional to the absolute 3 0.384 3.06 0.605 0.133 0.042 W"
0.071
temperature. 4 0.513 4.83 1.04 0.226 0.106 0.027
7.45
0.641
1.58
0.343
5
Therefore, to determine the 6 0.769 10.6 2.23 0.408 0.148 0.037 1"
pressure drop for inlet or aver- 8 1.025 18.6 3.89 0.848 0.255 0.062 0.019
age pressures other than 100 10 1.282 28.7 5.96 1.26 0.356 0.094 0.029 11A" 1%"
...
0.062
psi and at temperatures other 15 1.922 ... 13.0 2.73 0.834 0.201 0.102 0.026
0.345
2.563
L2.8
1.43
20
4.76
than 60 F, multiply the values
7.34
given in the table by the ratio: 25 3.204 ... 55.6 10.5 2.21 0.526 0.156 0.039 0.019
...
...
0.219
0.026
0.055
3.15
0.748
30
3.845
...
...
100 + 14.7
460 + i
( P+ 14.7 )(m) 35 4.486 ... ... 14.2 4.24 1.00 0.293 0.073 0.035 2*
5.126
0.095
1.30
5.49
40
0.379
18.4
0.044
...
...
0.474
1.62
0.055
6.90
13.1
0.116
5.767
45
where: so 6.408 18.5 8.49 1.99 0.578 0.149 0.067 0.019
...
"P" is the inlet or average 60 7.690 2%" L0.7 12.2 2.85 0.819 0.200 0.094 0.027
3.63
0.270
0.126
16.5
0.036
1.10
70
8.971
gauge pressure in pounds per 80 10.25 0.019 ... 21.4 4.96 1.43 0.350 0.162 0.046
...
square inch, and, 90 11.53 0.023 27.0 6.25 1.80 0.437 0.203 0.058
7.69
"t" is the temperature in 100 12.82 0.029 3 I' 33.2 11.9 2.21 0.534 0.247 0.070
...
0.380
0.825
0.107
3.39
16.02
0.044
125
degrees Fahrenheit under 150 19.22 0.062 0.021 ... 17.0 4.87 1.17 0.537 0.151
consideration. 175 22.43 0.083 0.028 ... 13.1 6.60 1.58 0.727 0.205
200 25.63 0.107 0.036 31/2" ... 30.0 8.54 2.05 0.937 0.264
The cubic feet per minute of 22s 28.84 0.134 0.045 0.022 37.9 10.8 2.59 1.19 0.331
compressed air at any pres- 250 32.04 0.164 0.055 0.027 ... 13.3 3.18 1.45 0.404
...
1.75
sure is inversely proportional 275 35.24 0.191 0.066 0.032 ... 16.0 3.83 2.07 0.484
19.0
0.573
4.56
0.078
0.037
38.45
300
0.232
to the absolute pressure and 325 41.65 0.270 0.090 0.043 ... 12.3 5.32 2.42 0.673
directly proportional to the 4" ...
absolute temperature. 350 44.87 0.313 0.104 0.050 0.030 ... 15.8 6.17 2.80 0.776
0.887
0.057
0.119
0.356
19.6
375
3.20
7.05
48.06
To determine the cubic feet 400 51.26 0.402 0.134 0.064 0.034 ... 33.6 8.02 3.64 1.00
...
1.13
9.01
per minute of compressed air 425 54.47 0.452 0.151 0.072 0.038 ... 37.9 10.2 4.09 1.26
...
57.67
0.168
4.59
0.042
0.507
450
0.081
at any temperature and pres-
0.047
11.3
sure other than standard con- 475 60.88 0.562 0.187 0.089 0.052 ... 12.5 5.09 1.40
...
0.099
5.61
1.55
0.206
64.08
0.623
500
ditions, multiply the value of 550 70.49 0.749 0.248 0.118 0.062 ... 15.1 6.79 1.87
cubic feet per minute of free 600 76.90 0.887 0.293 0.139 0.073 ... 15.0 8.04 2.21
...
air by the ratio: 650 83.30 1.04 0.342 0.163 0.086 5" 21.1 9.43 2.60
+
700
89.71
P
14.7
0.036
3.44
12.6
27.9
0.113
0.451
1.36
750
(X)(%%$) 96.12 1.19 0.395 0.188 0.099 0.032 24.3 10.9 3.00
0.214
800 102.5 1.55 0.513 0.244 0.127 0.041 31.8 14.2 3.90
850 108.9 1.74 0.576 0.274 0.144 0.046 35.9 16.0 4.40
900 115.3 1.95 0.642 0.305 0.160 0.051 6" 40.2 18.0 4.91
950 121.8 2.18 0.715 0.340 0.178 0.057 0.023 ... 20.0 5.47
1000 128.2 2.40 0.788 0.375 0.197 0.063 0.025 ... 22.1 6.06
...
1100 141.0 2.89 0.948 0.451 0.236 0.075 0 030 26.7 7.29
1 200 153.8 3.44 1.13 0.533 0.279 0.089 0: 035 ... 31.8 8.63
1300 166.6 4.01 1.32 0.626 0.327 0.103 0.041 ... 37.3 10.1
1 400 179.4 4.65 1.52 0.718 0.377 0.119 0.047 11.8
1 500 192.2 5.31 1.74 0.824 0.431 0.136 0.054 13.5
1 600 205.1 6.04 1.97 0.932 0.490 0.154 0.061 8 I' 15.3
1 800
Calculations for Pipe 2000 230.7 7.65 2.50 1.18 0.616 0.193 0.075 0.023 19.3
0.094
23.9
9.44
256.3
0.757
3.06
0.237
1.45
Other than Schedule 40 10"
2 500 320.4 14.7 4.76 2.25 1.17 0.366 0.143 0.035 37.3
To determine the velocity of 3000 384.5 21.1 6.82 3.20 1.67 0.524 0.204 0.051 0.016
0.022
0.068
0.709
9.23
3 500
water, or the pressure drop 4000 448.6 28.8 12.1 4.33 2.26 0.919 0.276 0.088 0.028
512.6
2.94
37.6
5.66
0.358
of water or air, through pipe 4 500 576.7 47.6 15.3 7.16 3.69 1.16 0.450 0.111 0.035 12*
other than Schedule 40, use ... 4.56 1.42 0.552 0.136 0.043 0.018
8.85
the following formulas: 5 000 640 8 ... 18.8 12.7 6.57 2.03 0.794 0.195 0.061 0.025
769:O
27.1
6 000
7 000 897.1 ... 36.9 17.2 8.94 2.76 1.07 0.262 0.082 0.034
8000 1025 ... ... 22.5 11.7 3.59 1.39 0.339 0.107 0.044
9 000 1153 ... ... 28.5 14.9 4.54 1.76 0.427 0.134 0.055
10 000 1282 ... ... 35.2 18.4 5.60 2.16 0.526 0.164 0.067
11 OOO 1410 ... ... ... 22.2 6.78 2.62 0.633 0.197 0.081
12 OOO 1538 ... ... ... 26.4 8.07 3.09 0.753 0.234 0.096
...
...
...
0.112
1666
0.884
0.273
3.63
31.0
9.47
Subscript "a" refers to the 13 000 1794 ... ... ... 36.0 11.0 4.21 1.02 0.316 0.129
14 OOO
Schedule of pipe through 15 OOO 1922 ... ... ... ... 12.6 4.84 1.17 0.364 0.148
which velocity or pressure 16 OOO 2051 ... ... ... ... 14.3 5.50 1.33 0.411 0.167
drop is desired. 18 000 2307 ... ... ... ... 22.4 6.96 1.68 0.520 0.213
18.2
...
...
...
...
2.01
2563
0.260
0.642
8.60
Subscript "40" refers to the 20 000 2820 ... ... ... ... 27.1 10.4 2.50 0.771 0.314
22 000
velocity or pressure drop ... ... ... ... 0.371
through Schedule 40 pipe, as 24 OOO 3076 ... ... ... ... 32.3 12.4 2.97. 0.918 0.435
14.5
37.9
3332
26 000
3.49
1.12
given in the tables on these 28 000 3588 ... ... ... ... ... 16.9 4.04 1.25 0.505
...
...
..I
0.520
1.42
facing pages. 30 000 3845 ... ... 19.3 4.64 - -
I_
*By permission Technical Paper No. 410, Crane Co., Engineering Div., Chicago, 1957.