Becker VRP-SB-PID Series Natural Gas Controllers Instruction Manual | 20
© 2016 General Electric Company. All rights reserved.
Example Application #6
Double Stage Cut with Working Monitor &
Two Proportional Controllers Only
This application is used for large pressure cuts, over
1000 psig (6895 kPa), across the station.
The intermediate pressure floats as load fluctuates.
Downstream pressure can fluctuate within proportional
band of the VRP-SB-PD controller. For a 3-15 psig (21-103 kPa)
output the proportional band is 23 psig (159 kPa).
In case of failure of working regulator, the working monitor
regulator will takeover control such acting as monitor.
VRP-SB-PD-40
REVERSE ACTING
TO COMPRESSOR
TURBINE
VRP-SB-PD-40
DIRECT ACTING
DERIVATIVE
L=6
DEAD BAND = 0
HIGH GAIN
(SMALL RINGS)
DERIVATIVE
L=3
DEAD BAND = 0
FLOW
HIGH GAIN
(SMALL RINGS)
SPRING TO OPEN GLOBE VALVE
WORKING REGULATOR
SPRING TO CLOSE GLOBE VALVE
WORKING MONITOR REGULATOR
INTEGRAL=0
(CLOSE VALVE)
INTEGRAL=0
(CLOSE VALVE)
1500-2000 PSIG
10342-13790 KPA
900-1100 PSIG
6205-7584 KPA
425-450 PSIG
2930-3103 KPA
KEY
OUTPUT PRESSURE
SENSING PRESSURE