Becker VRP-SB-PID Series Natural Gas Controllers Instruction Manual | 16
© 2016 General Electric Company. All rights reserved.
Example Application #2
Power Plant Station with T-Ball Style Control Valve
(4”, 6” and 8” Size)
This application is most commonly used when there is a
minimum ΔP < 25 psig (172 kPa) across the station. It is
configured using a main run and Start-up/Trimmer Run with
2” Globe Valves. When minimum ΔP > 50 psig Flexible Element
Regulator are used as start-up run. A Low Flow/Trimmer Run is
used for the start of power plants. It is also used in handling
small variations in the load from power plants.
VRP-SB-PD-40
DIRECT ACTING
MONITOR REGULATOR
SPRING TO CLOSE GLOBE VALVE
TO COMPRESSOR
TURBINE
WORKING REGULATOR
SPRING TO OPEN BALL VALVE
VRP-SB-PID-125
REVERSE ACTING
MONITOR REGULATOR
SPRING TO CLOSE BALL VALVE
WORKING REGULATOR
SPRING TO OPEN GLOBE VALVE
DEAD BAND = 0
INTEGRAL=0
DEAD BAND = -1/4
DEAD BAND = -1/4
INTEGRAL=6
VRP-SB-PID-40
REVERSE ACTING
INTEGRAL=12
HIGH GAIN
(SMALL RINGS)
VRP-SB-PID-125
DIRECT ACTING
DERIVATIVE
S=2
DERIVATIVE
S=3
INTEGRAL=12
DERIVATIVE
S=2
HIGH GAIN
(SMALL RINGS)
DERIVATIVE
S=2
VB-250
VOLUME
BOOSTER
HIGH GAIN
(SMALL RINGS)
DEAD BAND = -1/2
FLOW
VB-250
VOLUME
BOOSTER
HIGH GAIN
(SMALL RINGS)
KEY
(1)
(1)
ALL LINES ARE SEPARATE, INTERSECTING LINES DO NOT IMPLY CONNECTIONS
POWER GAS LINE
OUTPUT LINE
SENSING LINE
Recommended Applications:
A. Low pressure drop for T2 (1-300 psi)
B. High pressure drop for T4 (500-1000 psi)
C. Pipeline Heater and Filter are not required and Strainer is
recommended for trim run.