Air
Flow Through Orifices
Air Flow Through Orifices
Volume of free air in CFM that will flow thru round holes from a receiver into the atmosphere. Cubic feet of air per minute measured at absolute pressure of 14.7 lbs. per sq. in. and 70¼ F.
Air Flow Through Orifices
|
Dia.
of |
Guage
Pressure in Reciever - Pounds
|
||||||||||||||||||
|
2
|
5
|
10
|
15
|
20
|
25
|
30
|
35
|
40
|
45
|
50
|
60
|
70
|
80
|
90
|
100
|
125
|
150
|
200
|
|
| 1/64 |
0.04
|
0.062
|
0.077
|
0.105
|
0.123
|
0.14
|
0.158
|
0.176
|
0.194
|
0.211
|
0.29
|
0.267
|
0.3
|
0.335
|
0.37
|
0.406
|
0.494
|
0.583
|
0.75
|
| 1/32 |
0.158
|
0.248
|
0.311
|
0.42
|
0.491
|
0.562
|
0.633
|
0.703
|
0.774
|
0.845
|
0.916
|
1.06
|
1.2
|
1.34
|
1.48
|
1.62
|
1.98
|
2.32
|
3.18
|
| 3/64 |
0.356
|
0.568
|
0.712
|
0.944
|
1.1
|
1.26
|
1.42
|
1.58
|
1.75
|
1.91
|
2.06
|
2.38
|
2.7
|
3
|
3.33
|
3.66
|
4.44
|
5.25
|
6.86
|
| 1/16 |
0.633
|
0.993
|
1.24
|
1.68
|
1.96
|
2.25
|
2.53
|
2.81
|
3.1
|
3.38
|
3.66
|
4.23
|
4.79
|
5.36
|
5.92
|
6.49
|
7.9
|
9.1
|
12.17
|
| 3/32 |
1.43
|
2.23
|
2.8
|
3.78
|
4.41
|
5.05
|
5.69
|
6.31
|
7
|
7.63
|
8.25
|
9.5
|
10.8
|
12
|
13.3
|
14.6
|
17.8
|
20.9
|
27.35
|
| 1/8 |
2.53
|
3.97
|
4.98
|
6.72
|
7.86
|
8.98
|
10.1
|
11.3
|
12.4
|
13.5
|
14.7
|
16.9
|
19.2
|
21.4
|
23.7
|
26
|
31.6
|
37.3
|
48.7
|
| 3/16 |
5.7
|
8.93
|
11.2
|
15.2
|
17.65
|
20.2
|
22.8
|
25.2
|
28
|
30.5
|
33
|
38
|
43.2
|
48.3
|
53.2
|
58.5
|
71
|
84
|
109.6
|
| 1/4 |
10.1
|
15.9
|
19.9
|
26.9
|
31.4
|
35.9
|
40.5
|
45
|
49.6
|
54.1
|
58.6
|
67.6
|
76.7
|
85.7
|
94.8
|
104
|
126
|
149.3
|
195
|
| 3/8 |
22.8
|
35.7
|
44.7
|
60.5
|
70.7
|
80.9
|
91.1
|
101
|
112
|
122
|
132
|
152
|
173
|
193
|
213
|
234
|
284
|
336
|
438
|
| 1/2 |
40..5
|
63.5
|
79.6
|
108
|
126
|
144
|
162
|
180
|
198
|
216
|
235
|
271
|
307
|
343
|
379
|
415
|
506
|
596
|
777
|
| 5/8 |
63.03
|
99.3
|
124.5
|
168
|
196
|
225
|
253
|
281
|
310
|
338
|
366
|
423
|
479
|
536
|
592
|
649
|
790
|
932
|
1216
|
| 3/4 |
91.2
|
143
|
179.2
|
242
|
283
|
323
|
365
|
405
|
446
|
487
|
528
|
609
|
690
|
771
|
853
|
934
|
1138
|
1340
|
1750
|
| 7/8 |
124
|
195
|
244.2
|
329
|
385
|
440
|
496
|
551
|
607
|
662
|
718
|
828
|
939
|
1050
|
1161
|
1272
|
1549
|
1825
|
2382
|
| 1 |
162
|
254
|
318.2
|
430
|
503
|
575
|
648
|
720
|
793
|
865
|
938
|
1082
|
1227
|
1371
|
1516
|
1661
|
2023
|
2385
|
3112
|
| 1 - 1/8 |
205
|
321
|
402.5
|
544
|
637
|
727
|
820
|
910
|
1004
|
1094
|
1187
|
1370
|
1552
|
1734
|
1918
|
2101
|
2560
|
3020
|
3940
|
| 1 - 1/4 |
253
|
397
|
498
|
672
|
784
|
900
|
1019
|
1124
|
1240
|
1352
|
1464
|
1693
|
1917
|
2144
|
2370
|
2596
|
3160
|
3725
|
4860
|
| 1 - 3/8 |
307
|
482
|
604
|
816
|
954
|
1091
|
1230
|
1367
|
1505
|
1643
|
1780
|
2054
|
2330
|
2607
|
2880
|
3153
|
3840
|
4525
|
5910
|
| 1-1/2 |
364
|
572
|
716
|
968
|
1132
|
1293
|
1460
|
1620
|
1783
|
1946
|
2112
|
2335
|
2760
|
3081
|
3412
|
3734
|
4550
|
5360
|
7000
|
| 1 - 3/4 |
496
|
780
|
972
|
1318
|
1540
|
1760
|
1985
|
2205
|
2429
|
2650
|
2875
|
3310
|
3755
|
4200
|
4645
|
5085
|
6195
|
7300
|
9530
|
| 2 |
648
|
1015
|
1274
|
1720
|
2120
|
2300
|
2594
|
2880
|
3173
|
3460
|
3752
|
4330
|
4915
|
5480
|
6070
|
6650
|
8100
|
9540
|
12450
|
Table is based on 100% coefficient of flow. For well rounded entrance, multiply values by 0.97. For sharp edge orifices, a multiplier of 0.65 may be used. This table will give approximate results only. The formula Q=14.5 PD2, where Q is CFM, P is absolute pressure and D is orifice diameter in inches, may be used for any points not given in table. (Applies only above 15 pounds gauge.)
Please contact us for information or a quote if you need a reciprocating or rotary screw air compressor, refrigerated or desiccant air dryer, roots-type blower, vacuum pump, plant air system audit, or any compressed air product or service.
