Maintenance - GE Mooney Flowgrid Instruction Manual

Standby Monitor
Working Monitor
1. Purge station and open outlet regulator or vent to
allow flow through the station.
2. Set pilot (#3) to a high setting above desired setpoint.
3. Set pilot (#1) to a high setting above desired setpoint.
4. Set the Monitor pilot (#2) at a zero setting.
5. Set restrictor on Pilot (#1) at an intermediate opening
(a "4" setting on the Mooney Type 24 Restrictor).
6. Slowly open the inlet block regulator to station. The
1st Stage Regulator should remain closed as a result
of the Monitor Pilot (#2) being set to zero.
7. Increase the setting of the Monitor Pilot (#2) to the
desired pressure setting. If the regulator is unstable,
increase the restrictor opening until it becomes
stable.
Figure 10 - Working Monitor Schematic
NOTE: In a working Monitor system with less than 25 psig (1.72 bar) differential across the second stage
regulator the pilot supply may be connected to the piping upstream of the first stage regulator.
This will improve the shutoff of the second stage regulator.

Maintenance

Regulator parts are subject to normal wear and must
be inspected and replaced as necessary. The frequency
of inspection and replacement of parts depends on
severity of service conditions or the requirements of
local, state, and federal regulations. Be certain that the
name plates are updated to accurately indicate any
field changes in equipment, materials, service condi-
tions, or pressure settings.
© 2015 General Electric Company. All rights reserved.
8. Lower the setpoint of the 2nd stage regulator (Pilot
#3) to the desired outlet pressure setting. Tune the
restrictor on Pilot (#3) at this time. The 1st stage
regulator should open or begin to control the inter-
stage pressure at the setpoint of Pilot (#1).
9. Adjust the setpoint of Pilot (#1) to achieve the desired
Interstage pressure. Tune the restrictor on Pilot (#1) at
this time.
10. Raise the setpoint of Pilot (#3) to verify the setpoint
of the Monitor Pilot (#2). Adjust if necessary. Check for
system stability and adjust the restrictor on Pilot (#1)
if required.
11. Return setpoint of Pilot (#3) to maintain the desired
outlet pressure.
Before disassembly make sure the regulator has been
isolated from the process by closing block regulators on
the inlet and outlet sides of the regulator. Safely release
pressure and process fluid from body and pilot system.
Failure to complete these steps can result in personal
injury and property damage.
Mooney Flowgrid Regulator Instruction Manual | 13