How to Calculate Compressed Air Consumption
METHOD 1 |
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Air consumption is directly proportional to absolute inlet pressure |
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SCFM2 |
= |
P2 + 1 atmosphere |
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SCFM1 |
P1 + 1 atmosphere |
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Example: A Model 3215 Vortex Tube consumes 15 SCFM at 100 PSIG (425 SLPM @ 6.9 BAR). To calculate the airflow with an inlet pressure of 80 PSIG (5.5 BAR), the calculation is as follows: |
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| English Units: | Metric Units: | |||||||||
SCFM2 |
= | 80 PSIG + 14.7 |
SLPM2 |
= | 5.516 BAR + 1.014 |
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15 |
100 PSIG + 14.7 |
424.752 |
6.895 BAR + 1.014 |
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METHOD 2 |
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Multiply the known flow by the ratio of the input pressures converted to absolute |
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| Step 1: Calculate the ratio of absolute inlet pressures. | |||||||||
| English Units: | Metric Units: | ||||||||
80 PSIG + 14.7 |
= | 0.8256 |
5.516 BAR + 1.014 |
= | 0.8256 |
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100 PSIG + 14.7 |
6.895 BAR + 1.014 |
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| Step 2: Multiply known flow by the above calculated ratio. | |||||||||
| English Units: | Metric Units: | ||||||||
15 SCFM x 0.8256 = 12.384 SCFM |
424.752 SLPM x 0.08256 = 350.693 SLPM |
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Therefore |
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Model 3215 consumes 15 SCFM @ 100 PSIG (425 SLPM @ 6.9 BAR) and will consume 12.4 SCFM @ 80 PSIG (351 SLPM @ 5.5 BAR). |
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Note: To convert SCFM to SLPM, multiply SCFM by 28.3168. To convert PSIG to BAR, multiply PSIG by 0.0689 |
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