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How to overhaul and operate marine centrifugal pump

Marine Centrifugal pump are mostly utilise onboard ship, for transferring liquid from one point to another.

Both Engine and deck section demand to know how to apply and overhaul this equipment.

This article volition give yous basic knowledge well-nigh how you can smoothly operate centrifugal pump and as well how to overhaul it.

Someone may ask, why did I mention deck section above?. Deck department operators require this cognition because when y'all are operating an equipment, there is demand for y'all to have basic knowledge (if non professional person) about the equipment you use.

Knowing this will non only gird you lot on proper way of operations, but too give you confident to dictate or understand the behaviour of the equipment.

Most of the time, the engine department do have disharmonism with the deck coiffure only because of Improper use of machineries. This clash normally happen either between the top four, or the junior officers (third class).

Therefore always try to understand basically the equipment yous operate, operate with care and take information technology serve you.

Main objective

The main objective of this article being to bring to your knowledge the mode of operations of centrifugal pump and how to overhaul it, kickoff we are going to learn proper fashion of starting and stopping this pump.

Open the suction valve ( mostly located at sea breast or tank area)
Brand sure the discharge valve are on close position
Proceed the power off
Manually turn the pump shaft ( shaft between the pump and motor, to bank check how free the pump is, perchance how any obstructions). Note in example of big pumps, you need to start and stop (some seconds) to observe the behaviour.
If free, crack/fully open the discharge valve ( incase of high pressure) and beginning the motor.
Open up the discharge gradually till it gets full open up.
Bank check the pressure and regulate with the featherbed ( incase you have more than than required pressure level)

The to a higher place listed local mode of starting centrifugal pump has been adjusted with automatic air release arrangement. Therefore ever check the pump golden book(manual) earlier using it.

How to overhaul centrifugal pump

Check and shut suction and belch valves
Switch off the ability from the distribution panel or principal switch.
Disconnect the electrical wire, note the rotation direction terminals(incase of iii face connexion), and connect the same way after overhaul.
Check the coupling bolt ( if bellow,beam,etc coupling ) and remove them.

For types of coupling and pumps to apply them check here

If your pump is on vertical position, connect concatenation block and pull the motor up, check for locked water pressure,then open the pump.
If the pump is on horizontal position, loose the pump motor base bolt and remove the motor to create infinite for you,and then follow aforementioned condom procedure mentioned above.
Loose the pump flanges or pump impeller joint( as recommended by your pump type), then bring out the pump.

How to dismantle pump mechanisms

Dismantle the pump starting from the impeller side. Loose the guide nut and washer.
Use pulley to screw out the impeller, then remove mechanical seal.
Remove the bearing guide pin/lock ring behind.
Tap carefully on the shaft( recommended with wood or robber hammer) from behind to remove the bearings together with the shaft.
Check and inspect bearings. If necessary change them.
To change, make clean the shaft, lubricate with oil and tap advisedly from behind the bearing groove.
To install new bearing,clean the groove very well and lubricate and so install from the minor end as removed.
Clean the bearing housing, grease properly, and install the shaft from the impeller side. Don't forget the deviation between the two ends.
Install new mechanical seal advisedly.
Install any washers as removed.
Place the impeller to the terminate side ( almost be straight and hand free) then tap around it, to seat proper(lock pin should be available).
Put the washers and nut every bit removed, and tight.
Check and rotate the shaft for complimentary movement.
Box up and check alignment. Mount the electric motor and connect the pump.
Before starting the pump, cheque over again for gratuitous movement.
You are washed.

Note: the to a higher place instructions may be different depend on the pump purpose. The to a higher place instructions are mostly for water centrifugal pumps.

If y'all have questions or additions, feel complimentary to annotate below. Nosotros will help y'all.

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6 thoughts on "How to overhaul and operate marine centrifugal pump"

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Yes very good explaining for us so valuable. Cheers
Yes very good explaining for us so valuable. Thanks