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Start up and Operation
The following procedures are suggested for start up of
the Flowgrid regulator Start up of the Flowgrid regulator
should be made by qualified personnel familiar with high
pressure systems and pilot operated regulators.
WARNING
The instruction manual for the PILOT(S) being used
should be consulted to ensure that the installation
and start up instructions for the pilot are followed.
Some pilots can be damaged if not installed and put
into operation correctly.
Pressure Reducing Regulator
1. Adjust the pilot restrictor to an intermediate opening
(a “4” setting on the Mooney Type 24 Restrictor).
2. Back off on the pilot adjusting screw to fully relieve all
the spring compression.
3. If installed, open hand regulator(s) in the control
line(s), and the pilot supply line.
4. Slightly open downstream block regulator or open
vent in piping downstream of the Flowgrid regulator.
5. Slowly open the upstream block regulator to pres-
surize the Flowgrid regulator and pilot system. The
Flowgrid regulator should lock up (shut off) with zero
pressure downstream.
6. Use vent in the downstream piping or slowly open
the outlet block regulators.
7. Slowly increase the pilot spring setting until some
flow is achieved through vent or into downstream
system. Adjust the pilot restrictor for stability and
performance as follows:
a. If the system is stable, adjust the pilot
restrictor to a more closed position (towards
MIN setting). Change the flow rate or increase
the pilot setting to check the operation of the
system during an upset.
b. If the system is stable, repeat step (a) until the
system is unstable (oscillating).
c. Now readjust the restriction to a more open
position (towards MAX setting) where the
system is stable.
d. Vary the flow rate over as wide a range as
possible to make sure the system will be
stable under all flow conditions.
NOTE: Adjustment of the restrictor affects the
response rate, stability, and sensitivity of the regula-
tor. CLOSING the pilot restrictor (moving adjustment
towards MIN setting) will result in higher gain (narrow
the proportional band), more sensitivity, and slower
closing speeds. OPENING the pilot restrictor (moving
the adjustment towards MAX setting) will result in less
gain (widen the proportional band), less sensitivity,
and faster closing speeds.
8. Slowly increase the pilot spring setting until the
desired downstream pressure is achieved.
9. Slowly close the downstream block regulator or vent
to check the Flowgrid regulator for lockup (shut off).
10. Slowly open the downstream block regulator. to
begin normal operation
Back Pressure Regulator or Relief Regulator
1. Adjust the pilot restrictor to an intermediate opening
(a “4” setting on the Mooney Type 24 Restrictor).
2. Increase pilot spring compression to maximum or
some margin above desired setting.
3. If installed, open hand regulators(s) in the control
line(s), and the pilot supply line.
4. Check that the Flowgrid regulator is vented to
atmosphere or the downstream system is ready to
accept flow.
5. Open the downstream block regulator or open vent
in piping downstream of the Flowgrid regulator.
6. Slowly open the upstream block regulator to pressur-
ize the Flowgrid regulator and pilot system.
The Flowgrid regulator should lock up (shut off) with
zero pressure downstream.
7. Slowly decrease the pilot spring setting until some
flow is achieved. The flow may only be through the
pilot system.
8. Adjust the pilot restrictor for stability and
performance as follows:
a. If the system is stable, adjust the pilot restrictor
to a more closed position (towards MIN setting).
Change the flow rate or increase the pilot
setting to check the operation of the system
during an upset.
b. If the system is stable, repeat step (a) until the
system is unstable (oscillating).
c. Now readjust the restriction to a more open
position (towards MAX setting) where the
system is stable.
d. Vary the flow rate over as wide a range as
possible to make sure the system will be stable
under all flow conditions.
NOTE: Adjustment of the restrictor affects the
response rate, stability, and sensitivity of the
regulator.
CLOSING the pilot restrictor (moving adjustment towards
MIN setting) will result in higher gain (narrow the propor-
tional band), more sensitivity, and slower closing speeds.
OPENING the pilot restrictor (moving the adjustment
towards MAX setting) will result in less gain (widen the
proportional band), less sensitivity, and faster closing
speeds.
9. Slowly adjust the pilot spring setting until the desired
upstream pressure (relief setting) is achieved.
Mooney Flowgrid Regulator Instruction Manual | 11
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