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Flow Curve
Regulator turndown characteristics
with gas filter / in regulated state.
Inlet pressure is 20 in. W.C. and outlet is set to 4 in. W.C.
Aproximate flow increase in CFH (natural gas) when removing the integral filter from the FRI.
At a pressure drop of:
0.8 in. W.C.
2.0 in. W.C.
4.0 in. W.C.
8.0 in. W.C.
Determining equivalent flow through valves using another gas
°
V
gas used
Density of Natural gas
f =
Density of gas used
Min. Flow
Flow (CFH) of natural gas; s.p. 0.65 at 60°F
FRI 705/6
25 CFH
35 CFH
35 CFH
35 CFH
°
= V
x
f
Natural gas
Turndown
Turndown
Turndown
Turndown
FRI 707/6
FRI 710/6
50 CFH
390 CFH
70 CFH
480 CFH
75 CFH
575 CFH
80 CFH
700 CFH
Type of gas
Natural gas
Butane
Propane
Air
Max. Flow
Inlet Pressure 20 in. W.C.
Outlet Pressure 4 in. W.C.
FRI 712/6
765 CFH
940 CFH
1180 CFH
1510 CFH
Density
s.g.
[kg/m
]
3
0.81
0.65
1.00
2.39
1.95
0.58
1.86
1.50
0.66
1.24
1.00
0.80
f
8 ... 10
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