Maintenance; Maintenance Schedule - Xylem G&L A-C 8300 Series Instruction Manual

6 Maintenance

6.1 Maintenance schedule

CAUTION:
Shorten the inspection intervals if the pumped liquid is abrasive or corrosive, or if the
environment is classified as potentially explosive.
NOTICE:
This timetable assumes that the unit has been constantly monitored after startup. Adjust
the timetable for any extreme or unusual applications or conditions.
Monthly inspections
Check the bearing temperature with a thermometer. Do not check the temperature by
hand. If the bearings are running over 180°F (82°C), then there is too much or too little
lubricant.
If changing the lubricant or adjusting to the proper level does not correct the condition,
then disassemble and inspect the bearings.
Three-month inspections
Perform these tasks every three months:
• Check the oil on oil-lubricated units.
• Check the grease-lubricated bearings for saponification. This condition is usually
caused by the infiltration of water or other fluid. Saponification gives the grease a
whitish color. If this condition occurs, then wash out the bearings with a clean industrial
solvent and replace the grease with the proper type as recommended.
Six-month inspections
Perform these tasks every six months:
• Take vibration readings on the bearing housings. Compare the readings with the last
set of readings to check for possible pump component failure.
• Check the shaft for scoring.
• Check the alignment of the pump and driver. Shim the units if necessary. If
misalignment reoccurs frequently, then inspect the entire piping system. Unbolt the
piping at the suction and discharge flanges to see if it springs away, which indicates
strain on the casing. Inspect all piping supports for soundness and effective support of
load. Correct as necessary.
Annual inspections
Perform these inspections one time each year:
• Remove the upper half of the casing. Inspect the pump thoroughly for wear. Order
replacement parts if necessary.
• Check the wear ring clearances. Replace the wear rings when clearances become
three times their normal clearance or when you observe a significant decrease in
discharge pressure for the same flow rate.
• Remove any deposit or scaling.
• Clean out the stuffing box piping.
• Measure the total dynamic suction and discharge head in order to test pump
performance and pipe condition. Record the figures and compare them with the
G&L Pumps Series A-C 8300 Base Mounted Centrifugal Pump INSTRUCTION MANUAL
6 Maintenance
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