CHART Trifecta Pro Series, Product Manual

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49 Product Manual - Trifecta
®
Pro Series
Procedure
Over time components of the Trifecta Pro Series (as in any
mechanical system) can degrade and/or fail if not properly
maintained. For this reason, a regular maintenance procedure
is recommended to prevent any unexpected downtime
The most common field failures are due to:
• Clogged fill line strainer or strainer having been
completely removed by service technician permitting
entry of debris to system
• Malfunctioning solenoids and check valves (leaks) caused
by:
– Buildup of impurities of liquid fed to the system from
the bulk tank
– Introduction of moisture to the bulk system without
proper purge process
– Normal wear and tear of solenoids’ pistons and seats
due to cycling
– Debris entering Trifecta Pro Series from bulk station
due to removed strainer
• Leaking fittings
– All connections are leak checked from the factory and
should be re-checked periodically
– All replaced fittings in the field must be checked to
ensure proper operation
• Malfunctioning cylinder reliefs
– Relief valve opening at lower pressure than set point
– Burst disc rupture (fatigue failure)
With a regular maintenance procedure, these possible
failures and corresponding down times can be prevented To
ensure uninterrupted operation, it is recommended that the
following maintenance procedures be followed:
• Every six months:
– Clean/replace strainer on liquid feed line
Note: DO NOT operate system without a fill line
strainer in place.
Preventive Maintenance
• Every year:
– Verify two normal operation cycles
–
Inspect integrity of all wire connections in control
box Tighten all loose connectors
– Verify accuracy of analog gauges against pressure
transmitters and DP transmitters
–
Leak check entire Trifecta Pro Series system
– Inspect flex hoses for leaks and defects
• Every three years or at cycle count limit: (10,000 cycles
per tank)
– Replace all check valves
–
Replace pistons and coils on all solenoid valves and
rebuild cryogenic ball valves
– Replace relief valves and burst discs on tanks 1 and 2
• Every five years or at cycle count limit (20,000 cycles per
tank)
– Replace flex hoses on bottom withdrawal lines
Note: Reset cycle counter after servicing valves.
Whenever solenoid piston assemblies are serviced, or valve
is taken apart for cleaning, the bolts must be accurately
torqued to 10 to 12 foot-pounds of torque in a normal cross
pattern upon re-assembly. If they are over torqued, the body
will become distorted, and “pinch” the piston, causing the
valve to stick open or closed It is also recommended that
every time the valve is disassembled, that the gasket be
replaced, as the gasket takes a permanent set each time the
bolts are tightened and will not re-seal a second time