Dungs HPSV 10020/604 Installationsanleitung Handbuch - Seite 7
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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
Determining equivalent flow through valves using another gas
f =
7 ... 8
the "corrected" flow rate in CFH through
the valve for the other gas used. For ex-
ample, when using propane, divide the
volume (CFH) of propane required for
the application by the calculated value
°
°
V
= V
x f
gas used
Natural gas
Density of Natural gas
Density of gas used
f (f = 0.66 for propane). Use this "cor-
rected" 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