Maintenance And Inspection - Emerson CSB400 Series Instruction Manual

CSB400 Series
or closed slowly and that the outlet pressure be
vented before venting inlet pressure to prevent
damage caused by reverse pressurization of the
regulator. The steps below apply to the typical
installation as indicated.
1. Open valves downstream of the regulator.
2. Slowly close the upstream shut-off valve.
3. Inlet pressure should automatically be released
downstream as the regulator opens in response to
the lowered pressure underside of the diaphragm.
4. Close outlet shut-off valve.

Maintenance and Inspection

WaRnIng
!
To avoid personal injury or equipment
damage, do not attempt any maintenance
or disassembly without first isolating
the regulator from system pressure and
relieving all internal pressure as described
in "Shutdown".
Regulators that have been disassembled
for repair must be tested for proper
operation before being returned to
service. Only parts manufactured by
Regulator Technologies should be used
for repairing Fisher
gas utilization equipment according to
normal startup procedures.
Due to normal wear or damage that
may occur from external sources, this
regulator should be inspected and
maintained periodically. The frequency
of inspection and replacement depends
on the severity of service conditions,
test results found during the annual test,
and on applicable codes and regulations.
In accordance with applicable national
or Industry codes, standards and
regulations/recommendations, all
hazards covered by specific tests after
final assembly, before applying the CE
marking, shall also be covered after every
subsequent reassembly at installation site
inorder to ensure that the equipment will
be safe throughout its intended life.
Periodic inspection must be performed
on the CSB400 Series that include
the Integral Monitor or slam-shut
overpressure protection modules to
ensure that they protect the downstream
16
regulators. Restart
®
system in the event the primary regulator
losses pressure control. This inspection
must test that the Integral Monitor or
slam-shut functions as intended. The
frequency of this inspection must be at
intervals not exceeding 15 months, but at
least once each calendar year.
Disassembly to Replace the Regulator
Main Diaphragm
1. Remove the closing cap (key 60, Figure 12)
or loosen hex locknut (key 58, Figure 17).
Turn the adjusting screw (key 65) or nut
(key 58) counterclockwise to ease spring
(key 38) compression.
2. Remove the adjusting screw (key 65) and
spring (key 38).
3. Remove hex nuts (key 16, Figure 12) and cap
screws (key 15, Figure 12). Separate the upper
spring case (key 1) from the lower casing assembly
(key 9).
When disassembling a CSB400 Series
regulator, lift the upper spring case
(key 1) straight up in order to avoid
hitting the stem (key 44).
4. Slide the diaphragm assembly (key 55) away from
the body (key 70) to unhook the pusher post
(key 50) from the lever (key 10). Lift off the
diaphragm assembly (key 55).
5. a. For none relieving units such as the
Types CSB400IN and CSB400EN, unscrew the
cap (key 45), see Figure 13, high-pressure
Non-Relief and low-pressure Non-Relief
assemblies. The cap fastens the R.V. spring
seat (key 43) to the pusher post (key 50).
Unscrew the cap to separate the R.V. spring
seat (key 43), diaphragm assembly (key 55) and
pusher post (key 50).
b. For units with internal token relief such as
Type CSB400IT, refer to Figure 13, unscrew
the adjusting upper seat (key 47). This will
allow for removal of the relief spring (key 41),
R.V. spring seat (key 43), diaphragm assembly
(key 55) and pusher post (key 50).
6. Reassemble the spring case (key 1) unit in the
reverse order of the above steps. Before tightening
the cap screws (key 15) or stem (key 44) into the
pusher post (key 50), place the loosely-assembled
diaphragm assembly (key 55) into position in the
note