Table is based on 100% coefficient of flow.
| |
DIAMETER OF ORIFICE |
|
Gauge Pressure
Before Orifice
in Pounds
per sq. in.
|
1/64"
|
1/32"
|
1/16"
|
1/8"
|
1/4"
|
3/8"
|
1/2"
|
5/8"
|
3/4"
|
7/8"
|
1"
|
|
Discharge in cubic feet of free air per minute
|
1
2
3
4
5 |
.028
.040
.048
.056
.062 |
.112
.158
.194
.223
.248 |
.450
.633
.775
.892
.993 |
1.80
2.53
3.10
3.56
3.97 |
7.18
10.10
12.40
14.30
15.90 |
16.20
22.80
27.80
32.10
35.70 |
28.70
40.50
49.50
57.00
63.50 |
45.00
63.30
77.50
89.20
99.30 |
64.70
91.20
111.00
128.00
143.00 |
88.10
124.00
152.00
175.00
195.00 |
115.00
162.00
198.00
228.00
254.00 |
6
7
9
12
15 |
.068
.073
.083
.095
.105 |
.272
.293
.331
.379
.420 |
1.09
1.17
1.32
1.52
1.68 |
4.34
4.68
5.30
6.07
6.72 |
17.40
18.70
21.20
24.30
26.90 |
39.10
42.20
47.70
54.60
60.50 |
109.00
117.00
132.00
152.00
168.00 |
156.00
168.00
191.00
218.00
242.00 |
213.00
230.00
260.00
297.00
329.00
|
213.00
230.00
260.00
297.00
329.00 |
278.00
300.00
339.00
388.00
430.00 |
20
25
30
35
40 |
.123
.140
.158
.176
.194 |
.491
.562
.633
.703
.774 |
1.96
2.25
2.53
2.81
3.10 |
7.86
8.98
10.10
11.30
12.40 |
31.40
35.90
40.50
45.00
49.60 |
70.70
80.90
91.10
101.00
112.00 |
126.00
144.00
162.00
180.00
198.00 |
196.00
225.00
253.00
281.00
310.00 |
283.00
323.00
365.00
405.00
446.00 |
385.00
440.00
496.00
551.00
607.00
|
503.00
575.00
648.00
720.00
793.00 |
|
45
50
60
70
80
|
.211
.229
.264
.300
.335 |
.845
.916
1.060
1.202
1.340 |
3.38
3.66
4.23
4.79
5.36 |
13.50
14.70
16.90
19.20
21.40 |
54.10
58.60
67.60
76.70
85.70 |
122.00
132.00
152.00
173.00
193.00 |
216.00
235.00
271.00
307.00
343.00 |
338.00
366.00
423.00
479.00
536.00 |
487.00
528.00
609.00
690.00
771.00
|
662.00
718.00
828.00
939.00
1050.00 |
865.00
938.00
1082.00
1227.00
1371.00 |
90
100
110
120
125 |
.370
.406
.441
.476
.494 |
1.48
1.62
1.76
1.91
1.98 |
5.92
6.49
7.05
7.62
7.90 |
23.70
26.00
28.20
30.50
31.60 |
94.80
104.00
113.00
122.00
126.00 |
213.00
234.00
254.00
274.00
284.00 |
379.00
415.00
452.00
488.00
506.00 |
592.00
649.00
705.00
762.00
790.00 |
853.00
934.00
1016.00
1097.00
1138.00 |
1161.00
1272.00
1383.00
1494.00
1549.00 |
1516.00
1661.00
1806.00
1951.00
2023.00 |
150
200
250
300
400 |
.582
.761
.935
.995
1.220 |
2.37
3.10
3.80
4.88
5.98 |
9.45
12.35
15.18
18.08
23.81 |
37.50
49.00
60.30
71.80
94.50 |
150.00
196.00
241.00
287.00
378.00
|
338.00
441.00
542.00
646.00
851.00 |
600.00
784.00
964.00
1148.00
1512.00
|
910.00
1225.00
1508.00
1795.00
2360.00 |
1315.00
1764.00
2169.00
2583.00
3402.00 |
1789.00
2401.00
2952.00
3515.00
4630.00 |
2338.00
3136.00
3856.00
4592.00
6048.00 |
500
750
1000 |
1.519
2.240
2.985 |
7.41
10.98
14.60 |
29.55
43.85
58.21 |
117.30
174.00
231.00 |
469.00
696.00
924.00 |
1055.00
1566.00
2079.00 |
1876.00
2784.00
3696.00 |
2930.00
4350.00
5790.00
|
4221.00
6264.00
8316.00 |
5745.00
8525.00
11318.00 |
7504.00
11136.00
14784.00 |