Types 1098-EGR and 1098H-EGR
11
Figure 7.
Typical Working Monitor Installation
26A4298-A
A2118-2
uPSTREAM
PRESSuRE
VENT VAlVE
uPSTREAM
BlOCK VAlVE
HAND VAlVE
TyPE 161Ayw OR 627-109
MONITORINg PIlOT
TyPE 1098-EgR
OR 1098H-EgR
wORKINg MONITOR
REgulATOR
HAND
VAlVE
VENT
VAlVE
STANDARD 6350 SERIES PIlOT FOR
TyPE 1098-EgR OR 1098H-EgR REgulATOR
SECOND-STAgE
REgulATOR
HAND VAlVE
VENT VAlVE
DOwNSTREAM
BlOCK VAlVE
DOwNSTREAM
PRESSuRE
HAND VAlVE
INTERMEDIATE
PRESSuRE
VENT VAlVE
wORKINg MONITOR SySTEM
Startup
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 flow.
3. Slowly open the hand valve in the control line
and make sure that the standby pilot is set
far enough below the working pilot so that
the standby pilot remains closed during normal
operation. For example, with final desired settings
of 11-inches w.c. / 27 mbar for the working pilot
and 10-inches w.c. / 25 mbar for the standby
pilot, begin by reducing the working pilot setting
far enough below 10-inches w.c. / 25 mbar for
the working pilot to shut off. Then set the standby
pilot for an outlet pressure of 10-inches w.c. /
25 mbar. Finally, set the working pilot for an
outlet pressure of 11-inches w.c. / 27 mbar.
Table 6 shows how close the standby pilot can be
set to the working pilot setting.
4. Completely open the downstream block valve.
5. Slowly close the bypass valve, if any.
working Monitor (Figure 7)
Installation
1. For both working monitor regulator and
working regulator, perform the Standard Single-
Pilot Regulator Installation section through step 6.
2. Connect another downstream pressure control
line and hand valve (Figure 7) to the monitoring
pilot according to the monitoring pilot instruction
manual. Attach a 1/2 NPT pressure control
line and hand valve from the intermediate
pressure pipeline to the working monitor regulator.
Pipe supply pressure between the monitoring pilot
and the working monitor regulator according to the
monitoring pilot manual.
For two typical monitoring pilots, Table 7 gives
the spread between normal distribution pressure
and the minimum pressure at which the working
monitor regulator can be set to take over if the
working regulator fails to open.
Startup
On a working monitor installation (Figure 7), be sure that
the second-stage working regulator is set to operate at a
pressure lower than the Type 1098-EGR or 1098H-EGR
working monitor regulator. To do this, increase the setting
of the monitoring pilot until the working pilot is in control of
the intermediate pressure and the second-stage working
regulator is in control of the downstream pressure. If this
is not done, the monitoring pilot tries to take control of the
downstream pressure.
1. Slowly open the upstream block valve and
the hand valves in both pilot supply lines. This
energizes both pilots so that their setpoints can
be adjusted. Partially open the downstream block
valve for minimum flow.
