19 | GE Oil & Gas
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Example Application #5
Fuel Regulator to Compressor Turbine
This application typically uses a VRP-SB-PID in conjunction
with 2” or 3” Balance Cage Globe Valves.
The regulators are located within 50 feet or less from
the compressors. In this example, main line pressure of
800-1000 psig (5516-6895 kPa) was to be reduced to fuel
pressure of 250 psig (1724 kPa).
In this case a Double Stage Cut is preferred for better noise
and vibration control, but it results in a highly unstable system.
In order to compensate for this instability the first stage cut
involves the conversion of the VRP-SB-PID to a VRP-SB-PD.
TO COMPRESSOR
TURBINE
VRP-SB-PD-40
REVERSE ACTING
VRP-SB-PID-40
DIRECT ACTING
DERIVATIVE
L=6
DEAD BAND = 0
HIGH GAIN
(SMALL RINGS)
DERIVATIVE
S=3
DEAD BAND = 0
FLOW
HIGH GAIN
(SMALL RINGS)
SECOND STAGE CUT REGULATOR
SPRING TO OPEN GLOBE VALVE
FIRST STAGE CUT REGULATOR
SPRING TO CLOSE GLOBE VALVE
INTEGRAL=0
(CLOSE VALVE)
INTEGRAL=3
800-1000 PSIG
5516-6895 KPA
500-523 PSIG
3447-3606 KPA
250 PSIG
1724 KPA
KEY
OUTPUT PRESSURE
SENSING PRESSURE
