Maintenance of Pumps

Need of maintenance of Pumps:

Maintenance of pumps in good working condition will help reduce costs and boost profits by cutting fuel consumption, reducing parts replacement costs and minimizing pumping time on every project.

A pump working under the handicap of a suction line air leak, a corroded discharge line or a clogged impeller gulps excessive amounts of energy, takes longer than necessary to do the job, and subjects parts to undue stress, causing premature wear-out.

Centrifugal Pumps – Mal Functions:
  • THERE’S A NOTICEABLE DIFFERENCE IN PUMP FLOW.
          It can be due to a leaking gasket, plugged suction line, a damaged or worn impeller or wear plate.
  • PUMP ISN’T REPRIMING AS RAPIDLY AS IT ONCE DID.

It may be due to leakage of pump seals and failure of suction check valve sealing.

  • PUMP IS MAKING EXCESSIVE NOISE.

This may be due to cavitations which can be caused due to plugged suction or the pump bearings might have worn out.

  • PUMP IS CLOGGING FREQUENTLY.
             The suction check valve may be clogged, and improper strainer may be too large or small, or the     strainer may be in mud plugging the suction side.
  • PUMP IS OVERHEATING
   It may be very likely the flow of liquid into or out of the pump is being restricted due to clogging of the suction strainer.
Checklist to Improve Pump Performance
SUCTION LINE
  1. Check for air leaks. Using a vacuum gauge, make sure that the suction line, fittings and pipe plugs are airtight. Replace leaky seals and badly worn hoses.
  2. Check the suction strainer. Frequent inspection and cleaning of the suction strainer is particularly important when pumping liquids containing solids. Proper size strainer should prevent pump from clogging.
PUMP
  1. Check impeller vanes, wear plate or wear rings. These components should be inspected every six months or sooner, depending on pump application. They’re subject to faster wear when pumping abrasive liquids and slurries. Wear plates and wear rings can be replaced without replacing expensive castings.
  2. Check impeller clearance. If the clearance between impeller and wear plate or wear rings is beyond recommended limits, pumping efficiency will be reduced. If the clearance is less than that recommended, components will wear excessively. If tolerances are too close, rubbing could cause an overload on the engine or motor. Check the impeller clearance against pump manual specifications and adjust if necessary.
  3. Check the seal. Most pumps are equipped with a double seal lubricated under pressure – with a spring-loaded grease cup or an oil lubricated tungsten titanium carbide seal for long, trouble-free service. If your pump has a single seal and it is lubricated with the water being pumped, sand and other solids can cause rapid wear. Check and replace the seal if worn. Replace seal liner or shaft sleeve if it has scratches.
  4. Check bearings. Worn bearings can cause the shaft to wobble. Eventually the pump will overheat and sooner or later it win freeze up and stop. Replace bearings at the first sign of wear.

DISCHARGE LINE

  1. Check operating condition. Check air release devices, valves, check valves and shock control devices for proper operation. Old discharge lines are subject to internal rusting and pitting, which

Cause friction loss and reduce flow by as much as 15%. Replace badly deteriorated line.

Pump Maintenance Checklist

Description Comment Maintenance Frequency
Daily Weekly Monthly Annually
Pump use and sequencing Turn off or sequence unnecessary motors. X
Overall visual inspection Complete overall visual inspection to be sure all equipment is operating and safety systems are in place. X
Check lubrication Assure that all bearings are lubricated per the manufacturer’s recommendation. X
Check packing Check packing for wear and repack as necessary. Consider replacing packing with mechanical seals. X
Motor and pump alignment Align the pump/motor coupling to allow for efficient torque transfer to the pump. X
Check mountings Check and secure all pump mountings. X
Check bearings Inspect bearings and drive belts for wear. Adjust, repair, or replace as necessary. X
Motor condition Check the condition of the motor through temperature or vibration analysis to assure long life. X

 

 

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