Emerson Fisher 1098-EGR - Shutdown; Single-Pilot, Dual-Pilot Regulator or Wide-Open Monitor

Types 1098-EGR and 1098H-EGR
13
2. Connect the control line of the wide-open
monitoring regulator (Figure 7) to downstream
piping near the working regulator control
line connection. During normal operation the
wide- open monitoring regulator stands wide-open
with the pressure reduction being taken across
the working regulator. Only in case of working
regulator failure does the wide-open monitoring
regulator take control at its slightly higher setting.
Startup
Repeat this procedure in turn for each regulator in
the installation.
1. Slowly open the pilot supply line hand valve.
2. Slowly open the upstream block valve and
partially open the downstream block valve for
minimum ow.
3. Slowly open the hand valve in the control line
and adjust the pilot setting if necessary. Set the
monitoring regulator at a slightly higher control
pressure than the working regulator.
4. Completely open the downstream block valve.
5. Slowly close the bypass valve, if any.
Shutdown
Installation arrangements vary, but in any installation it
is important that the valves be opened or closed slowly
and that the outlet pressure be vented before venting
inlet pressure to prevent damage caused by reverse
pressurization of the pilot or main valve. The following
steps apply to the typical installation as indicated.
Single-Pilot, Dual-Pilot Regulator or
Wide-Open Monitor
As well as applying to a single-pilot regulator (Figure 3),
the steps in this procedure are also valid for a dual- pilot
regulator (Figure 4) or a wide-open monitoring
installation (Figure 7) and just need to be repeated for
each regulator in such an installation.
1. Slowly close the downstream block valve. If the
control line is downstream of the block valve, also
close the hand valve in the control line.
2. Slowly close the upstream block valve and the
hand valve in the pilot supply line.
3. Slowly open the vent valve in the downstream
pipeline. If the control line is downstream of the
block valve, also open the vent valve in the control
line. Permit all pressure to bleed out.
4. Slowly open the upstream pipeline vent valve.
Allow all pressure to bleed out of both the piping
and the pilot.
Figure 7. Typical Wide-Open Monitor Installations
A6789
6350 SERIES PILOT
6350 SERIES PILOT
PILOT SUPPLY REGULATOR
FILTER
FILTER
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INTERMEDIATE PRESSURE
PILOT SUPPLY PRESSURE
LOADING PRESSURE