The values on the chart represent maximum recommended Air Flow In Standard Cubic Feet Per Minute through standard separators. The chart is based on SCFM (cubic feet per minute of air measured at standard conditions of 14.7 psia and 60 °F). If any of the operating conditions are varied from these, consult our sales team.

The values on the chart represent maximum recommended Air Flow In Standard Cubic Feet Per Minute through standard separators. The chart is based on SCFM (cubic feet per minute of air measured at standard conditions of 14.7 psia and 60 °F). If any of the operating conditions are varied from these, consult our sales team.

>
Temp °F
Factor
-20
0.904
-10
0.917
0
0.929
10
0.941
20
0.953
30
0.965
40
0.977
50
0.989
60
1.000
70
1.012
80
1.023
90
1.034
95
1.040
100
1.046
105
1.051
110
1.057
120
1.068
130
1.079
140
1.090
150
1.101
160
1.112
170
1.121
180
1.133
190
1.143
200
1.154
250
1.206
300
1.256
400
1.353
500
1.445
550
1.490
600
1.533
700
1.618
800
1.701
900
1.780
1000
1.858
Gas
Symbol
M.W.
G
Fg
Hydrogen
H2
2.0
0.069
0.344
Helium
He
4.0
0.138
0.452
Synthesis
75% H2 25% N2
8.5
0.295
0.611
Coke Oven
-
11.0
0.379
0.679
*Methane
CH4
16.0
0.551
0.788
Ammonia
NH3
17.0
0.586
0.808
Steam (Water Vapor)
H2O
18.0
0.621
0.826
*Natural Gas
75% CH4 25% N2
-
-
-
Acetylene
C2H2
26.0
0.897
0.957
Nitrogen
N2
28.0
0.950
0.986
Carbon Monoxide
CO
28.0
0.950
0.986
Air
-
29.0
1.00
1.00
Flue Gas
81%N2 19%CO2
31.0
1.08
1.027
Oxygen
O2
32.0
1.10
1.039
Argon
A
39.9
1.38
1.136
Propane
C3H8
44.1
1.52
1.182
*Carbon Dioxide
CO2
44.0
1.52
1.181
Nitrous Oxide
N2O
44.0
1.52
1.181
Butadiene
C4H6
54.1
1.86
1.284
Sulfur Dioxide
SO2
64.1
2.21
1.374
Chlorine
CI2
70.9
2.45
1.431
Freon 12
CCI2F2
120.9
4.17
1.770
* For applications involving gases (above 500 psi at 200 ˚F) so marked, contact us to determine whether there is an additional correction factor for compressibility
  • 1 psi = 2.036” Hg
  • 1” Hg = .4912 psi
  • 1 psi = 27.71” H2O
  • 1” H2O = .03613 psi
Symbol
Fg =
Correction factor for specific gravity
Ft =
Correction factor for temperature (See table on the inside page)
G =
Specific gravity
MMSCFD =
Million standard cubic feet per day
MW =
Molecular weight
Pa =
Pressure (psia) at which volume is measured
Qa =
Rate of flow standard
cubic feet
per min (ACFM)
Qc =
Rate of flow standard cubic feet per min of equivalent air
Qsg =
Rate of flow standard cubic feet per minute
T =
Operating temp. (°F)
Ta
Temperature (°F) at which volume is measured
W =
Rate of flow pounds per hour
The Air Flow Chart on the is based on SCFM (cubic feet per minute of air measured at standard conditions of 14.7 psia and 60 °F).

If any of the operating conditions are varied from the above, then correction factors must be applied. To use the Air Flow Chart for applications involving other gases or other than standard conditions, the following equation must be solved for Qc:
  • Qc = Qsgx Fg x Ft
In the event that Qsg is not provided in the proper form, any of the following equations may be used to arrive at the correct flow rate to insert in the above equation:
Qsg =
6.3 x W
MW
Qsg =
35.7 x Qa x Pa
MW
Qsg (air only) = .218 x W
Qsg =
MMSCFD
1440
W = (pounds mols/hour) x MW
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in mm
Volumetric Flow
in SCFM
in MMSCFD
in NM³/hr
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in kg/hr
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in kg/cm²
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in lpm
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