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For standard or normal pressure it is common to measure flow in
At vacuum the air or gas is expanded and it is common to use
Since the gas is expanded, actual flow is greater than standard flow for the same gas flow.
The flow volume can be converted from standard volume flow to actual volume flow by the expression:
qa = qs (29.92/p) ((t + 460)/520) (1)
where
qa = actual volume flow (acfm)
qs = standard volume flow (scfm)
p = actual pressure (in Hg)
t = temperature (oF)
| Conversion Factor from scfm to acfm (or nl/s to al/s) | ||||||||
| Pressure | TemperatureoF | |||||||
| in Hg absolute | in Hg gauge | Kpa absolute | 0 | 30 | 60 | 90 | 120 | 150 |
| 29.92 | 0.00 | 101.42 | 0.88 | 0.94 | 1.00 | 1.06 | 1.12 | 1.17 |
| 28.92 | 1.00 | 98.03 | 0.92 | 0.97 | 1.03 | 1.09 | 1.15 | 1.21 |
| 27.92 | 2.00 | 94.64 | 0.95 | 1.01 | 1.07 | 1.13 | 1.20 | 1.26 |
| 26.92 | 3.00 | 91.25 | 0.98 | 1.05 | 1.11 | 1.18 | 1.24 | 1.30 |
| 25.92 | 4.00 | 87.86 | 1.02 | 1.09 | 1.15 | 1.22 | 1.29 | 1.35 |
| 24.92 | 5.00 | 84.47 | 1.06 | 1.13 | 1.20 | 1.27 | 1.34 | 1.41 |
| 23.92 | 6.00 | 81.08 | 1.11 | 1.18 | 1.25 | 1.32 | 1.40 | 1.47 |
| 22.92 | 7.00 | 77.69 | 1.15 | 1.23 | 1.31 | 1.38 | 1.46 | 1.53 |
| 21.92 | 8.00 | 74.31 | 1.21 | 1.29 | 1.36 | 1.44 | 1.52 | 1.60 |
| 20.92 | 9.00 | 70.92 | 1.27 | 1.35 | 1.43 | 1.51 | 1.60 | 1.68 |
| 19.92 | 10.00 | 67.53 | 1.33 | 1.42 | 1.50 | 1.59 | 1.68 | 1.76 |
| 18.92 | 11.00 | 64.14 | 1.40 | 1.49 | 1.58 | 1.67 | 1.76 | 1.86 |
| 17.92 | 12.00 | 60.75 | 1.48 | 1.57 | 1.67 | 1.77 | 1.86 | 1.96 |
| 16.92 | 13.00 | 57.36 | 1.56 | 1.67 | 1.77 | 1.87 | 1.97 | 2.07 |
| 15.92 | 14.00 | 53.97 | 1.66 | 1.77 | 1.88 | 1.99 | 2.10 | 2.20 |
| 14.92 | 15.00 | 50.58 | 1.77 | 1.89 | 2.01 | 2.12 | 2.24 | 2.35 |
| 13.92 | 16.00 | 47.19 | 1.90 | 2.03 | 2.15 | 2.27 | 2.40 | 2.52 |
| 12.92 | 17.00 | 43.80 | 2.05 | 2.18 | 2.32 | 2.45 | 2.58 | 2.72 |
| 11.92 | 18.00 | 40.41 | 2.22 | 2.37 | 2.51 | 2.65 | 2.80 | 2.94 |
| 10.92 | 19.00 | 37.02 | 2.42 | 2.58 | 2.74 | 2.90 | 3.06 | 3.21 |
| 9.92 | 20.00 | 33.63 | 2.67 | 2.84 | 3.02 | 3.19 | 3.36 | 3.54 |
| 8.92 | 21.00 | 30.24 | 2.97 | 3.16 | 3.35 | 3.55 | 3.74 | 3.93 |
| 7.92 | 22.00 | 26.85 | 3.34 | 3.56 | 3.78 | 4.00 | 4.21 | 4.43 |
| 6.92 | 23.00 | 23.46 | 3.82 | 4.07 | 4.32 | 4.57 | 4.82 | 5.07 |
| 5.92 | 24.00 | 20.07 | 4.47 | 4.76 | 5.05 | 5.35 | 5.64 | 5.93 |
| 4.92 | 25.00 | 16.68 | 5.38 | 5.73 | 6.08 | 6.43 | 6.78 | 7.13 |
| 3.92 | 26.00 | 13.29 | 6.75 | 7.19 | 7.63 | 8.07 | 8.51 | 8.95 |
| 2.92 | 27.00 | 9.90 | 9.06 | 9.66 | 10.25 | 10.84 | 11.43 | 12.02 |
| 1.92 | 28.00 | 6.51 | 13.79 | 14.68 | 15.58 | 16.48 | 17.38 | 18.28 |
| 0.92 | 29.00 | 3.12 | 28.77 | 30.65 | 32.52 | 34.40 | 36.27 | 38.15 |
| 0.82 | 29.10 | 2.78 | 32.28 | 34.38 | 36.49 | 38.59 | 40.70 | 42.80 |
| 0.72 | 29.20 | 2.44 | 36.76 | 39.16 | 41.56 | 43.95 | 46.35 | 48.75 |
| 0.62 | 29.30 | 2.10 | 42.69 | 45.47 | 48.26 | 51.04 | 53.83 | 56.61 |
| 0.52 | 29.40 | 1.76 | 50.90 | 54.22 | 57.54 | 60.86 | 64.18 | 67.50 |
| 0.42 | 29.50 | 1.42 | 63.02 | 67.13 | 71.24 | 75.35 | 79.46 | 83.57 |
| 0.32 | 29.60 | 1.08 | 82.71 | 88.11 | 93.50 | 98.89 | 104.29 | 109.68 |
| 0.22 | 29.70 | 0.75 | 120.31 | 128.15 | 136.00 | 143.85 | 151.69 | 159.54 |
| 0.12 | 29.80 | 0.41 | 220.56 | 234.95 | 249.33 | 263.72 | 278.10 | 292.49 |
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