A centrifugal pump is used in large number on board ship and every marine engineer should know how to overhaul the centrifugal pump. Centrifugal pumps are mostly preferred because their outflow is large as compare to other pumps and their maintenance is less. But the pressure developed from this type of pump is not that much and reciprocating pumps come into play when pressure requirements are large. In this article I first discuss about the centrifugal pump and then, the procedure of overhauling the same.
What is a Centrifugal Pump?
Procedure of overhauling centrifugal Pump or compressors
all the spare parts are checked for availability like the Wear rings,
mechanical seal etc. All the power supply to this pumps should be removed and a
notice stating the ‘machine is under maintenance’ need to be hanged.
the tools and check them if they are in good condition or not. Before opening the coupling,
a mark between the coupling and casing should be made so that in future there
is no problem with the alignment.
the motor and use the “Jack-Bolts” for parting the casing half. Now open the casing and slowly lift it up with the help of crane.Note: In some cases there is no need to part the casing. After motor has been removed, tight the slings to the rest of the shaft to remove the impeller which is attached to the remaining shaft.
and check, and straight away replace this. Also install a new wear ring and check
mechanical seal and bearing bush. Avoid any dirt accumulating on the pieces
before fitting them because it will cause wear and tear.
and housing with respect to the markings.
and replace and tighten the hold bolts. Check that pump shaft is free to
again check the pump shaft is free to rotate. This is to ensure that pump will
free at the time of starting. Now replace the power supply to the motor.
slowly and after priming open the discharge valve and start the pump.
vibrating or not. After that check that the discharge pressure is good.
pump and remove all the markings and notices.
of work and hand over the readings you took while starting the pump after