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Calculating Air Consumption at Different Inlet Pressures

METHOD 1

Air consumption is directly proportional to absolute inlet pressure
SCFM2 P2 + 1 atmosphere

=
SCFM1 P1 + 1 atmosphere
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:
English:
SCFM2 80 PSIG + 14.7

=

15

100 PSIG + 14.7
SCFM2 = 12.3845

Metric:
SLPM2 5.5158 Bar + 1.0135

=

424.7527

6.8948 Bar + 1.0135
SLPM2 6.5293

=

424.7527

7.9083
SLPM2 = 350.6869

METHOD 2

Multiply the known flow by the ratio of the input pressures converted to absolute

STEP 1 Calculate the ratio of absolute inlet pressures

(English)     (Metric)
80 PSIG + 14.7 5.5158 Bar + 1.0135
  =    .8256  =  .8256 
100 PSIG + 14.7 6.8948 Bar + 1.0135

STEP 2 Multiply known flow by the above ratio you just calculated

(English)     (Metric)
15 SCFM x .8256 = 12.384 SCFM 4224.7527 SLPM x .8256 = 350.6869 SLPM

THEREFORE

Model 3215 which consumes 15 SCFM @ 100 PSIG (425 SLPM @ 6.9 bar) will consume 12.4 SCFM @ 80 PSIG (351 SLPM @ 5.5 Bar).

NOTE:     To convert SCFM to SLPM multiply by the factor 28.3168
To convert PSIG to Bar multiply by the factor .0689

 
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