Appendix C Gas Valve
C-41
Pressure Drop for other Gases
To determine the pressure drop when using a gas other than
CFH through the valve for the other gas used. For example,
when using propane, divide the volume (CFH) of propane
required for the application by the calculated value f (f = 0.66
on the next page to determine pressure drop for propane.
Density of Natural gas
Density of gas used
f =
Type of gas Density
[kg/m
3
]
s.g. f
Natural gas 0.81 0.65 1.00
Butane 2.39 1.95 0.58
Propane 1.86 1.50 0.66
Air 1.24 1.00 0.80
Determining equivalent through valves using another gas
V
gas used
= V
Natural gas
x f
°
°
MBC-4000-...
Curves for equipment selection (in regulated state) with micro
100
200 400
600
2,000
10,000
4,000
7,000
800 1,000
NPT 2
20,000
40,000
100,000
Based on 60 °F
14.65 psia, dry
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