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Flow Curve
Pressure Drop for other Gases
To determine the pressure drop when using a gas other than
natural gas, use the flow formula below and f value located
in the table below to determine the "corrected" flow rate in
CFH through the valve for the other gas used. For example,
Determining equivalent flow through valves using another gas
°
V
gas used
Density of Natural gas
f =
Density of gas used
Flow (CFH) of natural gas; s.g. 0.65 at 60 °F
°
= V
x f
Natural gas
Based on 60 °F
14.65 psia, dry
when using propane, divide the volume (CFH) of propane
required for the application by the calculated value f (f = 0.66
for propane). Use this "corrected" flow rate and the flow curve
on the next page to determine pressure drop for propane.
Type of gas
Density
[kg/m
Natural gas
0.81
Butane
2.39
Propane
1.86
Air
1.24
s.g.
f
]
3
0.65
1.00
1.95
0.58
1.50
0.66
1.00
0.80
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