IOM/GK(P)/CONICAL ISSUE DATE: 10.11.2015
Page 37 LAST REV. DATE: 01.08.2019
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Maintenance tools required:
No special tools are required for dismantling and reassembling. Toolbox
containing a general set of tools such as different sizes of ring spanners,
torque wrenches, open ended spanners, light ball peen hammer, wooden
mallet, various sizes of Allen keys, etc., serves the purpose. It is important
to ensure that the suitable lifting equipment is available and that the work is
carried out in clean area.
5.3
PREVENTIVE MAINTENANCE:
Preventive maintenance schedule is the periodical checks and precautions by
which possibilities of failures and breakdowns are minimized.
5.3.1 Daily checks:
5.3.1.1
Hourly record of suction and delivery pressure, discharge quantity input
to
the pump driver should be maintained.
5.3.1.2 Bearing temperature, oil level, stuffing box leakage / stuffing box
temperature, cooling water inlet and outlet temperature should be checked.
This gives an idea of mechanical performance of the pump.
5.3.1.3 Noise and vibrations are the first signs of impending troubles like
cavitations, air lock, bearing failure, choking of impeller or casing and such
other operating troubles. The pump performance should therefore be
checked for noise and vibrations.
5.3.2 Periodical checks:
5.3.2.1 The temperature of the bearing should be measured by thermometer. Safe
maximum working temperature of the bearing is 82°C.
5.3.2.2 The lubricants of the bearing should be checked. The lubricant might get
contaminated with foreign material or get blackened due to overheating. In
such cases, bearings should be flushed and charged with fresh lubricants.
5.3.2.3 Check for the stuffing box leakage. If the pumps are fitted with mechanical
seal, there should not be any product leakage from stuffing box.
5.3.2.4 The alignment of the pump unit should be checked. Due to operational
vibrations, atmospheric temperature or stress induced by the weight of the
piping, the alignment may get disturbed.
5.3.2.5 Sufficient quantity of suitable type of lubricant should be ready for daily
and emergency use.
5.3.2.6 Calibrate the measuring instrument.
5.3.3 Annual checks:
5.3.3.1 The pump should be overhauled completely to check the clearance and to
replace worn-out parts. Clearance between impeller and casing rings,
clearance between impeller and wear plate, etc., are very important. The
bearings should be cleaned thoroughly and lubricated.
