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How to overhaul and operate marine centrifugal pump

Marine Centrifugal pump are by and large use onboard ship, for transferring liquid from ane point to another.

Both Engine and deck section need to know how to use and overhaul this equipment.

This article volition give you basic knowledge about how you lot can smoothly operate centrifugal pump and besides how to overhaul it.

Someone may ask, why did I mention deck section to a higher place?. Deck department operators require this cognition because when you are operating an equipment, there is need for you to have basic knowledge (if non professional person) about the equipment you lot utilize.

Knowing this will not just gird you on proper way of operations, but besides give yous confident to dictate or understand the behaviour of the equipment.

Most of the time, the engine department exercise have clash with the deck crew but considering of Improper use of machineries. This clash normally happen either between the top four, or the inferior officers (3rd class).

Therefore always attempt to understand basically the equipment you operate, operate with intendance and have it serve yous.

Primary objective

The main objective of this article being to bring to your cognition the way of operations of centrifugal pump and how to overhaul it, first nosotros are going to larn proper way of starting and stopping this pump.

Open the suction valve ( mostly located at ocean breast or tank area)
Make certain the discharge valve are on close position
Keep the power off
Manually plow the pump shaft ( shaft between the pump and motor, to cheque how gratis the pump is, possibly how whatever obstructions). Notation in case of large pumps, you need to showtime and finish (some seconds) to observe the behaviour.
If complimentary, crevice/fully open the belch valve ( incase of loftier pressure) and start the motor.
Open the belch gradually till it gets full open.
Bank check the pressure and regulate with the bypass ( incase you lot take more than than required force per unit area)

The above listed local mode of starting centrifugal pump has been adjusted with automatic air release organisation. Therefore e'er check the pump golden book(manual) earlier using it.

How to overhaul centrifugal pump

Bank check and close suction and discharge valves
Switch off the ability from the distribution console or main switch.
Disconnect the electrical wire, note the rotation direction terminals(incase of three face connexion), and connect the same way after overhaul.
Check the coupling commodities ( if bellow,axle,etc coupling ) and remove them.

For types of coupling and pumps to use them check here

If your pump is on vertical position, connect chain block and pull the motor upward, check for locked water pressure,then open the pump.
If the pump is on horizontal position, loose the pump motor base commodities and remove the motor to create infinite for you,then follow same prophylactic 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 spiral out the impeller, then remove mechanical seal.
Remove the begetting guide pin/lock band backside.
Tap advisedly on the shaft( recommended with woods or robber hammer) from behind to remove the bearings together with the shaft.
Cheque and audit bearings. If necessary alter them.
To alter, clean the shaft, lubricate with oil and tap carefully from backside the bearing groove.
To install new bearing,clean the groove very well and lubricate then install from the small end as removed.
Make clean the bearing housing, grease properly, and install the shaft from the impeller side. Don't forget the difference betwixt the ii ends.
Install new mechanical seal carefully.
Install any washers as removed.
Place the impeller to the terminate side ( near be straight and hand gratis) then tap around information technology, to seat proper(lock pin should exist available).
Put the washers and nut as removed, and tight.
Check and rotate the shaft for free movement.
Box upwards and bank check alignment. Mount the electric motor and connect the pump.
Before starting the pump, bank check once more for free move.
You are done.

Notation: the above instructions may be dissimilar depend on the pump purpose. The above instructions are mostly for water centrifugal pumps.

If yous have questions or additions, experience gratis to comment below. Nosotros will help you.

If y'all learn something with this article, delight share, subscribe and recommend.

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

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Thank you for coming in, also for your suggestion
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Yes very good explaining for us and so valuable. Thanks
Yeah very good explaining for united states of america and so valuable. Cheers