## Calculating Air Consumption

Below is an example demonstrating how you can easily calculate the air consumption at different inlet pressures. If you need assistance, call us at +1-705-770-4455 or click here to email an Application Engineer.

EXAMPLE: A Model 7504 Vortex Tube consumes 4 SCFM @ 100 PSIG (113 SLPM @ 6.89 BAR). To calculate the airflow with an inlet pressure of 60 PSIG (4.1369 BAR), follow the below steps:

1 Atmosphere (ATM) = 14.7 (PSI)

1 (SCFM) = 28.3168 (SLPM)

1 (PSI) = .0689 (BAR)

STEP 1: Determine the ratio of absolute inlet pressures.

 English Metric 60 (PSIG) + 14.7 = 74.7 100 (PSIG) + 14.7 = 114.7 74.7 divided by 114.7 = 0.6512 is the Ratio 4.1369 (BAR) + 1.0135 = 5.1504 6.8948 (BAR) + 1.0135 = 7.9083 5.1504 divided by 7.9083 = 0.6512 is the Ratio

STEP 2: Multiply the above Ratio by the known factor (4 SCFM).

 English Metric 4 (SCFM) x 0.6512 = 2.6048 SCFM Therefore Model 7504 Vortex Tube operating at 60 PSIG will consume just 2.6048 SCFM. 113 (SLPM) x 0.6512 = 73.5856 Therefore Model 7504 Vortex Tube operating at 4.1369 BAR will consume just 73.585 SLPM.