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Pressure Flow Through Orifices in SCCM
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Size of
Orifice |
Pressure (psig) |
| 5 |
10 |
15 |
20 |
25 |
30 |
| .0004" |
1.00 |
1.25 |
1.75 |
2.35 |
2.75 |
3.20 |
| .0008" |
2.66 |
4.50 |
6.00 |
7.75 |
8.75 |
10.0 |
| .0010" |
5.0 |
8.0 |
11.0 |
13.0 |
16.0 |
18.0 |
| .0012" |
7.0 |
11.5 |
17.0 |
21.0 |
25.0 |
29.0 |
| .0016" |
13.0 |
20.0 |
25.0 |
32.0 |
40.0 |
45.0 |
| .0018" |
14.5 |
25.0 |
35.0 |
39.5 |
49.0 |
60.0 |
| .0020" |
25.6 |
40.0 |
50.0 |
60.0 |
70.0 |
80.0 |
| .0025" |
37.0 |
55.0 |
72.0 |
85.0 |
100.0 |
120.0 |
| .0030" |
48.0 |
75.0 |
92.0 |
109.0 |
128.0 |
150.0 |
| .0035" |
69.0 |
100.0 |
130.0 |
156.0 |
185.0 |
210.0 |
| .0040" |
90.0 |
135.0 |
165.0 |
200.0 |
230.0 |
280.0 |
| .0060" |
200.0 |
310.0 |
375.0 |
450.0 |
530.0 |
590.0 |
| .0080" |
370.0 |
570.0 |
694.0 |
810.0 |
936.0 |
1100 |
| .0100" |
550.0 |
775.0 |
1000 |
1190 |
1390 |
1595 |
| .0120" |
875.0 |
1200 |
1490 |
1790 |
2000 |
2400 |
Size of
Orifice |
Pressure (psig) |
| 40 |
50 |
60 |
70 |
80 |
100 |
| .0004" |
4.18 |
5.14 |
6.00 |
7.00 |
8.00 |
10.00 |
| .0008" |
12.5 |
15.0 |
18.0 |
21.0 |
24.5 |
29.0 |
| .0010" |
24.0 |
28.0 |
32.0 |
37.0 |
43.0 |
50.0 |
| .0012" |
40.0 |
50.0 |
60.0 |
68.0 |
77.0 |
100.0 |
| .0016" |
52.0 |
65.0 |
75.0 |
83.0 |
96.0 |
120.0 |
| .0018" |
75.0 |
95.0 |
120.0 |
135.0 |
155.0 |
200.0 |
| .0020" |
95.0 |
115.0 |
140.0 |
155.0 |
172.0 |
220.0 |
| .0025" |
145.0 |
170.0 |
200.0 |
220.0 |
250.0 |
310.0 |
| .0030" |
180.0 |
215.0 |
250.0 |
280.0 |
313.0 |
400.0 |
| .0035" |
260.0 |
315.0 |
360.0 |
400.0 |
455.0 |
575.0 |
| .0040" |
330.0 |
390.0 |
450.0 |
510.0 |
583.0 |
745.0 |
| .0060" |
750.0 |
875.0 |
1000 |
1150 |
1275 |
1600 |
| .0080" |
1320 |
1550 |
1800 |
2000 |
2222 |
2700 |
| .0100" |
1900 |
2200 |
2600 |
2900 |
3300 |
4000 |
| .0120" |
2900 |
3500 |
4000 |
4500 |
5000 |
6000 |
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Pressure Flow Through Orifices in SCFM
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Size of
Orifice (In.) |
Pressure (psig) |
| 2 |
5 |
10 |
15 |
20 |
25 |
30 |
35 |
40 |
| 1/64" |
.024 |
.040 |
.061 |
.079 |
.096 |
.113 |
.129 |
.145 |
.161 |
| 1/32" |
.098 |
.161 |
.243 |
.319 |
.384 |
.451 |
.516 |
.581 |
.645 |
| 3/64" |
.22 |
.363 |
.547 |
.71 |
.86 |
1.01 |
1.16 |
1.31 |
1.45 |
| 1/16" |
.391 |
.645 |
.972 |
1.26 |
1.54 |
1.80 |
2.07 |
2.32 |
2.58 |
| 3/32" |
.881 |
1.45 |
2.19 |
2.84 |
3.46 |
4.06 |
4.65 |
5.23 |
5.81 |
| 1/8" |
1.57 |
2.58 |
3.89 |
5.05 |
6.15 |
7.21 |
8.26 |
9.30 |
10.3 |
| 3/16" |
3.52 |
5.80 |
8.75 |
11.4 |
13.8 |
16.2 |
18.6 |
20.9 |
23.2 |
| 1/4" |
6.26 |
10.3 |
15.6 |
20.2 |
24.6 |
28.9 |
33.0 |
37.2 |
41.3 |
| 3/8" |
14.1 |
23.2 |
35.0 |
45.4 |
55.3 |
64.9 |
74.4 |
83.7 |
92.9 |
| 1/2" |
25.1 |
41.3 |
62.2 |
80.8 |
98.4 |
115 |
132 |
149 |
165 |
| 5/8" |
39.1 |
64.5 |
97.2 |
126 |
154 |
180 |
207 |
232 |
258 |
| 3/4" |
56.4 |
92.9 |
140 |
182 |
221 |
260 |
297 |
335 |
372 |
| 7/8" |
76.7 |
126 |
191 |
247 |
301 |
354 |
405 |
455 |
506 |
Size of
Orifice (In.) |
Pressure (psig) |
| 45 |
50 |
60 |
70 |
80 |
90 |
100 |
125 |
| 1/64" |
.177 |
.193 |
.225 |
.256 |
.287 |
.319 |
.350 |
.428 |
| 1/32" |
.709 |
.772 |
.898 |
1.02 |
1.15 |
1.27 |
1.40 |
1.71 |
| 3/64" |
1.59 |
1.74 |
2.02 |
2.30 |
2.59 |
2.87 |
3.15 |
3.85 |
| 1/16" |
2.84 |
3.09 |
3.59 |
4.10 |
4.60 |
5.10 |
5.60 |
6.85 |
| 3/32" |
6.38 |
6.95 |
8.09 |
9.22 |
10.3 |
11.5 |
12.6 |
15.4 |
| 1/8" |
11.3 |
12.4 |
14.4 |
16.4 |
18.4 |
20.4 |
22.4 |
27.4 |
| 3/16" |
25.5 |
27.8 |
32.3 |
36.9 |
41.4 |
45.9 |
50.4 |
61.6 |
| 1/4" |
45.4 |
49.4 |
57.5 |
65.5 |
73.6 |
81.6 |
89.6 |
110 |
| 3/8" |
102 |
111 |
129 |
147 |
166 |
184 |
202 |
246 |
| 1/2" |
181 |
198 |
230 |
262 |
294 |
326 |
358 |
438 |
| 5/8" |
284 |
309 |
359 |
410 |
460 |
510 |
560 |
685 |
| 3/4" |
408 |
445 |
518 |
590 |
662 |
734 |
806 |
986 |
| 7/8" |
556 |
605 |
704 |
803 |
901 |
999 |
1097 |
1342 |
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