1 | GE Oil & Gas
© 2016 General Electric Company. All rights reserved.
Introduction
GE’s Becker VRP-SB-PID series Natural Gas Controller
represents a breakthrough in pressure control technology for the
natural gas industry. Built to exacting specifications, this easily
maintained unit offers highly accurate control in a broad range
of operating environments. In addition to minimizing bleed gas,
the VRP-SB-PID series controllers are designed such that their
bleed gas can be routed to a lower pressure fuel gas system,
eliminating atmospheric bleed gas completely. The elimination
of this expensive bleed gas ultimately saves a significant
amount of money for the operating company and reduces
the environmental impact of atmospheric hydrocarbons,
and diminishing natural resources.
Your VRP-SB-PID controller will come factory adjusted for
your particular application. The use of the adjustment
procedures in this manual will only become necessary upon
installation of a rubber goods replacement kit, or any other
disassembly or reassembly of the controller.
Description
The Becker VRP-SB-PID is a proportional-integral-derivative
controller. This concept will be further explained in the
operations section of this manual. The VRP-SB-PID can
operate as a controller working in tandem with a positioner.
It can also operate as a high-pressure controller, controlling
a single acting actuator without the need for a positioner.
Another advantage of the VRP-SB-PID is its versatility.
With a few adjustments the VRP-SB-PID can be transformed
into a proportional plus derivative controller or VRP-SB-PD.
In VRP-SB-PD mode the controller can be used for highly
unstable systems for example, double stage cuts.
Table of Contents
Page
Page
Introduction .........................................................................................................1
Description ...........................................................................................................1
Scope of this Manual ..........................................................................................2
Technical Assistance ..........................................................................................2
Technical Information ........................................................................................2
Principles of Operation ......................................................................................4
Control Spring Range Selection for VRP-SB-PID Controllers .................6
Conversion to VRP-SB-PD Controller: ...............................................................9
Control Spring Range Selection for VRP-SB-PD Controllers ............... 10
PID-40, PID-80, PID-125 Explanations ........................................................... 11
Adjustment Procedure .....................................................................................11
Applications .......................................................................................................13
Power Plant Control Station with Start-up/Trimming Regulator .... 14
Power Plant Station with Globe Style Control Valve ............................... 15
Power Plant Station with T-Ball Style Control Valve .............................. 16
Power Plant Station with Globe Style Control Valve
and Globe Valve Trim ............................................................................................ 17
Power Plant Station with Globe Style Control Valve ............................. 18
Fuel Regulator to Compressor Turbine ......................................................... 19
Double Stage Cut with Working Monitor &
Two Proportional Controllers Only .................................................................. 20
Annual Maintenance Checklist ......................................................................21
Parts Lists and Part Numbers .......................................................................22
Accessories ........................................................................................................27
Assembly Manual..............................................................................................28
Top Body Assembly ............................................................................................... 28
Bottom Body Assembly ....................................................................................... 28
Top Body Piston Assembly ................................................................................ 30
Bottom Body Piston Assembly ......................................................................... 30
Top Body Diaphragm Assembly ...................................................................... 31
Bottom Body Diaphragm Assembly .............................................................. 31
Sensitivity Drum Assembly ................................................................................ 32
Centering the Diaphragms ................................................................................ 33
Sensitivity Spacer Assembly ............................................................................. 34
Bottom Cap Assembly ......................................................................................... 35
Bracket Mounting .................................................................................................. 36
Diaphragm Assembly #1 .................................................................................... 37
Diaphragm Assembly #2 .................................................................................... 37
Diaphragm Assembly #3 .................................................................................... 37
Spring Support Plate Assembly ....................................................................... 38
Feedback Chamber Assembly ......................................................................... 38
Spring Cartridge Assembly ................................................................................ 40
Adjusting Screw Assembly ................................................................................ 42
Spring Chamber Assembly ................................................................................ 43
Cap Assembly .......................................................................................................... 45
Appendix A - List of Recommended Tools ....................................................47
Appendix B - Parts Silhouettes .......................................................................48
Bolts and Washers ................................................................................................. 48
Washers and Nuts .................................................................................................. 49
Diaghragm ................................................................................................................. 50
O-Rings ......................................................................................................................... 51
