Types 1098-EGR and 1098H-EGR
11
Figure 7. Typical Working Monitor Installation
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 ow.
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 nal desired settings of 11 in. w.c. /
27 mbar for the working pilot and 10 in. w.c. /
25 mbar for the standby pilot, begin by reducing
the working pilot setting far enough below
10 in. w.c. / 25 mbar for the working pilot to
shut off. Then set the standby pilot for an outlet
pressure of 10 in. w.c. / 25 mbar. Finally, set the
working pilot for an outlet pressure of 11 in. 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 ow.
1098-EGR Working Monitor
A6788
6350 SERIES PILOT
6350 SERIES PILOT
TYPE Y600M OR 627-109
MONITORING PILOT
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INTERMEDIATE PRESSURE
LOADING PRESSURE
1098-EGR Working Monitor
A6788
6350 SERIES PILOT
6350 SERIES PILOT
March 2007
Type 1098-EGR
TYPE Y600M OR 627-109
MONITORING PILOT
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INTERMEDIATE PRESSURE
LOADING PRESSURE
A6788
(184 pages)
(128 pages)
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