Type EZL
8
pilot on the monitoring regulator is wide-open during
normal operation, the pilot supply regulator is used
to prevent differential pressure relief valve chatter on
the monitoring regulator pilot.
Working Monitor Regulator (Figure 5)
1. Follow the procedure in the All Installations section
and then continue with step 2 of this section.
2. Attach 3/8 in. / 9.5 mm tubing (for Types 161M and
161EBM) downstream control line to the control line
(sense) connection on the pilot. Connect the other
end of the control line to the pipeline downstream
of the downstream working regulator. Do not attach
the control line near any elbow, swage, block valve
or any other location that might cause turbulence.
3. Apply pilot sense pressure by connecting the
outlet of the monitor pilot to the inlet of the working
monitor pilot.
Startup and Adjustment
Pre-startup Considerations
Each regulator is factory-set for the outlet pressure
specied on the order. If no setting was specied,
outlet pressure was factory-set at the mid-range of
the pilot control spring. Before beginning the startup
procedure in this section, make sure the following
conditions are in effect:
• Block valves isolate the regulator
• Vent valves are closed
• A bypass, if any, is in operation
In all cases, check the control spring setting to make
sure it is correct for the application.
CAUTION
Be sure to slowly introduce pressure
into the system to prevent downstream
overpressure due to potential rapid
pressure increase. Pressure gauges
should always be used to monitor
downstream pressure during startup.
Procedures used in putting this
regulator into operation must be planned
accordingly if the downstream system is
pressurized by another regulator or by a
manual bypass.
Startup
1. Make sure all block valves, vent valves and control
line valve(s) are closed.
2. Back out the pilot adjusting screw(s).
3. Slowly open the valves in the following order:
a. Pilot supply and control line valve(s), if used.
b. Inlet block valves.
4. Crack open the outlet block valve or bypass valve
to allow minimum ow.
5. For a single regulator, set the pilot to the
desired outlet (control) pressure according to
the Pilot Adjustment procedure.
For a wide-open downstream monitor
installation, adjust the upstream working pilot until
intermediate pressure is higher than the desired
setpoint of the monitor pilot. Adjust the downstream
monitoring pilot to the desired monitoring takeover
pressure. Reduce the upstream pilot to the normal
outlet pressure setting.
For a wide-open upstream monitor installation,
adjust the downstream working pilot to a setpoint
higher than the setpoint of the monitor pilot.
Adjust the downstream monitoring pilot to the
desired monitoring takeover pressure. Reduce the
upstream pilot to the normal outlet pressure setting.
For a working monitor installation, adjust the
setpoint of the upstream monitor pilot to the desired
maximum pressure. Adjust the upstream working
pilot to the desired intermediate pressure setting.
Adjust the downstream pilot to a pressure setting
slightly above the upstream monitor pilot pressure
setting. Adjust the upstream monitor pilot to
its desired setpoint. Establish nal desired
downstream pressure by adjusting the downstream
working regulator pilot.
6. After adjusting the pilot(s) to the desired pressure
setting(s), slowly open the downstream block
valve wide-open.
7. Close the bypass valve, if used.
(32 paginas)
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