6 Maintenance
6.1 Maintenance schedule
Maintenance inspections
A maintenance schedule includes these types of inspections:
• Routine maintenance
• Routine inspections
• Three-month inspections
• Annual inspections
Shorten the inspection intervals appropriately if the pumped fluid is abrasive or corrosive
or if the environment is classified as potentially explosive.
Routine maintenance
Perform these tasks whenever you perform routine maintenance:
• Lubricate the bearings.
• Inspect the seals.
Routine inspections
Perform these tasks whenever you check the pump during routine inspections:
• Check for unusual noise, vibration, and bearing temperatures.
• Check the pump and piping for leaks.
• Check the seal chamber and stuffing box for leaks.
– Ensure that there are no leaks from the mechanical seals.
Three-month inspections
Perform these tasks every three months:
• Check that the foundation and the hold-down bolts are tight.
Annual inspections
Perform these inspections one time each year:
• Check the pump capacity.
• Check the pump pressure.
• Check the pump power.
If the pump performance does not satisfy your process requirements, and the process
requirements have not changed, then perform these steps:
1. Disassemble the pump.
2. Inspect it.
3. Replace worn parts.
6.1.1 Wear ring replacement
Maintenance schedule
It is important to monitor wear ring running clearances during annual inspections or
whenever the pump is disassembled. Pump performance will be reduced as wear rings
are worn down. Use feeler gauges to determine the gap size between each impeller wear
ring and casing wear ring. Check multiple points around the wear rings as wear may not
be uniformly distributed. The following table lists the approximate gap sizes that indicate
when the wear rings should be replaced.
6 Maintenance
36 e-XC INSTRUCTION MANUAL
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