Maintenance - Emerson Fisher 299HR Manual

Shutdown
Installation arrangements may vary, but in any installation
it is important to open and close valves slowly and the
outlet pressure be vented before venting inlet pressure to
prevent damage caused by reverse pressurization of the
regulator. Isolate the regulator from the system. Vent the
downstream pressure; then vent inlet pressure to release
any remaining pressure in the regulator.

Maintenance

Regulator parts are subject to normal wear and must
be inspected periodically and replaced as necessary.
The frequency of inspection and replacement depends
upon the severity of service conditions and upon
applicable codes and government regulations.
Due to the care Emerson takes in meeting all
manufacturing requirements (heat treating,
dimensional tolerances, etc.), use only replacement
parts manufactured or furnished by Emerson.
WARNING
!
Avoid personal injury or damage
to property from sudden release
of pressure or uncontrolled gas or
other process fluid. Before starting
to disassemble, carefully release all
pressures according to the Shutdown
procedure. Use gauges to monitor inlet,
loading and outlet pressures while
releasing these pressures.
On reassembly of the regulator, it is recommended
that a good quality pipe thread sealant be applied to
pressure connections and fittings and a good quality
lubricant be applied to all O-rings. Also apply an anti-
seize compound to the adjusting screw threads and
other areas as needed.
Note
The regulator body may remain in the
pipeline during maintenance procedures.
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Main Actuator Diaphragm
Follow this procedure to change the actuator
diaphragm or to inspect, clean or replace any other
parts in the main actuator. Part key numbers are
referenced in Figures 3 and 4.
1. Cut the wire seal (key 68) (being careful not to
lose the warning tag) and remove the closing cap
(key 3). Inspect the O-ring (key 9) and replace
if necessary.
2. Carefully loosen and remove the double nuts
(key 5) on the actuator diaphragm post (key 10).
When removing the adjusting nuts, do not twist
or unscrew the diaphragm post, as this action will
loosen the joint between the diaphragm post and
the pusher post (keys 10 and 11).
3. Remove the spring seat (key 4) and closing
spring (key 6).
4. Remove the eight hex head cap screws (key 23)
and lift off the upper casing (key 2).
5. Remove the diaphragm assembly (key 8) by
tipping it so that the lever (key 26) slips out of the
pusher post (key 11).
6. Separate the diaphragm assembly by
unscrewing the diaphragm post (key 10) from the
pusher post (key 11) and remove the diaphragm
post, pressure equalization spring (key 7),
diaphragm head (key 81), diaphragm (key 8), the
second diaphragm head (key 81) and diaphragm
pad (key 80). Inspect the diaphragm parts for
damage and replace if necessary.
7. Inspect the lever (key 26) and replace if
necessary. To replace the valve stem (key 16),
also perform Main Body Valve Disk and Orifice
maintenance procedure steps 1, 2 and 3, remove
disk (key 13) and pull the stem out of the lower
casing assembly (key 1). Lightly lubricate the
replacement stem O-ring (key 14) and install it on
the valve stem. Reinstall the valve stem into the
lower casing assembly. Reinstall the body (key 17)
or continue with the reassembly of the diaphragm.
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