Types 1098-EGR and 1098H-EGR
8
Note
Normal pressure drop assists shutoff.
Therefore, leakage may result during any
reverse pressure drop condition.
1.
Use qualified personnel when installing, operating
and maintaining regulators. Before installing,
inspect the main valve, pilot and tubing for any
shipment damage or foreign material that may
have collected during crating and shipment. Make
certain the body interior is clean and the pipelines
are free of foreign material. Apply pipe compound
only to the external pipe threads with a screwed
body or use suitable line gaskets and good bolting
practices with a flanged body.
With a weld end body, be sure to remove the trim
package, including the gasket, according to the
Maintenance section before welding the body into
the line. Do not install the trim package until any
post-weld heat treatment is completed. If heat
treating, prevent scale buildup on all machined
guiding and sealing surfaces inside the body and
at the bonnet flange/body joint.
2.
The regulator maybe installed in any orientation,
as long as flow through the regulator matches the
direction of the flow arrow attached to the valve
body. However, mounting the main valve with the
valve stem in a horizontal position may experience
stem wear on units with a size 70 actuator or
NPS 4 and larger.
3. Install a three-valve bypass around the regulator
if continuous operation is necessary during
maintenance or inspection. The pilot may be field-
changed to the opposite-side mounting position
by swapping the pilot pipe nipple to the opposite
bonnet tapping.
!
wARNINg
A regulator may vent some gas to
the atmosphere. In hazardous or
flammable gas service, vented gas may
accumulate and cause personal injury,
death or property damage due to fire or
explosion. Vent a regulator in hazardous
gas service to a remote, safe location
away from air intakes or any hazardous
location. The vent line or stack opening
must be protected against condensation
or clogging.
4. To keep the pilot spring case vent from being
plugged or the spring case from collecting moisture,
corrosive chemicals or other foreign material, point
the vent down or otherwise protect it. To remotely
vent the standard pilot, remove the vent and install
obstruction-free tubing or piping into the 1/4 NPT
vent tapping. Provide protection on a remote vent
by installing a screened vent cap into the remote
end of the vent pipe.
5. Run a 3/8 in. / 9.5 mm outer diameter or larger
pilot supply line from the upstream pipeline to
the filter inlet as shown in Figure 3. Do not make
the upstream pipeline connection in a turbulent
area, such as near a nipple, swage or elbow. If
the maximum pilot inlet pressure could exceed the
pilot rating, install a separate reducing regulator in
the pilot supply line. Install a hand valve in the pilot
supply line and provide vent valves to properly
isolate and relieve the pressure from the regulator.
6.
Attach a 1/2 NPT downstream pressure control
line downstream of the regulator in a straight run
of pipe, as shown in Figure 3. Do not make the tap
near any elbow, swage or nipple that might cause
turbulence. Connect the other end of the control
line to the bonnet connection. Install a hand valve
in the control line to shut off the control pressure
when the bypass is in use.
7. If a quick acting solenoid is to be installed
downstream of the regulator, the regulator
and solenoid should be located as far apart as
practical. This maximizes the gas piping volume
between the regulator and solenoid and improves
the regulator response to quick-changing
flow rates.
8. Consult the appropriate instruction manual for
installation of an optional Type 662 pneumatic
or electric remote control drive unit. For optional
remote pneumatic loading of a 6350 or 61 Series
pilot, make the loading piping connections to the
1/4 NPT vent connection.
Pre-startup Considerations
Before beginning the startup procedures in this section,
make sure the following conditions are in effect:
• Block valves isolate the regulator.
•
Vent valves are closed.
•
Hand valves are closed.
