General Planning For Maintenance - Baker Hughes Consolidated 4900 Series Instruction Manual

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General Planning for Maintenance

A 12 month maintenance interval is recommended for general service
conditions.
For severe service applications, a 3 to 6 month inspection and test interim
may be more appropriate. The specific plant's operating and service history
will better determine this frequency. Baker Hughes encourages preventive
maintenance.
The 4900 series Pilot Operated Safety Relief Valve (POSRV) is easily
maintained.
Normal maintenance usually involves:
• Removal of pilot valve from main valve
• Disassembly of both the pilot and main valve
• Cleaning
• Component Inspection
• Parts Replacement as Needed
• Reassembly
• Setting, Testing and Resealing the Valve
Occasionally, remachining the nozzle may be necessary to extend the
service life of the valve. Keep all parts for each valve separated to ensure
replacement in the same valve.
Note: Ensure there is no pressure in the inlet of the valve before
attempting to remove it from the piping system.
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Baker Hughes
Always use appropriate
restoration procedures.
Do not interchange
parts from one valve
to another.
Do not remove bolts
if pressure in line, as
this will result in severe
personal injury
or death.
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