PURIFIERS |Basic Principle And Operation |Importance of Each Spare Parts

The centrifugal purifiers or separator consists of a bowl containing a set of discs stacked one on top of the other. The dirty oil flows down the distributor and up through the holes in the discs.centrifugal_purifier_basic
What is gravity disc ?
The gravity disc is important part of purifier, which set the location of the oil, and water interface line, which is variable according to the maker’s design.
How to choose the correct size of gravity disc ?
Correct size is selected using: Separation temperature Density of oil at this temperature Desired throughput of oil and by using of nomogram from the purifier manual.
What is paring disc ?
It is a stationary impeller mounted in a chamber at the neck of the bow. Its function is to convert the rotating energy of the liquid into a pressure head.
What about water washing ?
Water washing is widely used techniques to remove acids, salts, and other impurities from the oil. The oil must be straight mineral oils or without dispersant additive oils. Water should be injected into the oil before purifying at a rate of between 3 to 5% of the oil flow that is continuously renews the water seal in the purifier bowl. The oil temperature should be around 75 °C and water temperature about 5 °C higher than oil. It can be done continuously or intermittently.
What is steam jetting ?
By blowing steam into the engine lube oil just pair to its purification. Coagulation of colloidal carbon will occur. Purifier will remove this carbon more effectively.
Compare purifier and clarifier ?
Purifier
Remove water and suspended solids particles from oils
Two outlets water and clean oil
Gravity disc on top
Blind disc on the top of disc stack
Sealing water required
Clarifier
Remove finer and lighter particles from oil
One outlet for clean oil
No gravity disc only sealing ring
Blind disc at bottom.
Sealing water not required
How do you change purifier to clarifier ?
Open up the purifier and set the blind disc at the bottom of the disc stack. The water outlet is blocked by a seal on the gravity disc. Blank off the sealing water inlet line.
What is purifier, clarifier ?
Purifier is a centrifuge, which is arranged to separate water and solid impurities from oil.Clarifier is a centrifuge, which is arranged to separate finer solid impurities from the oil.
How to change purifier from HFO to DO ?
Replace the gravity disc, which is smaller than the heavy oil
Open heater by pass vale.
Close the FO heater steam in/out valves.
Open heater drains v/v.
Pure DO purifier cannot change to HFO, it has no heater.
Pure clarifier cannot change to purifier, it has no water outlet.
Why multidisc provided inside purifier ?
To separate the liquid into thin layer & create shallow settling distance between discs. Improving separation of oil from heaver liquids & solids particle
Cause of excessive vibration on purifier ?
Sludge too much inside the bowl
Foundation damper & spring failure
Bearing failure
Worn gear Uneven wear of frictional clutch
Motor speed too high or too low
What are reasons for purifier over flow ?
Incorrect purifier disc size (inside diameter too large)
Too low fuel oil temperature
Too much rate of throughput
Too much sludge inside the bowl
Low speed (rpm) of bowl rotation
Sealing water failure
Operating water failure
Worn out main sealing ring
Why purifier is not building up speed while running ?
Improper touching with friction clutch (worn out frictional clutch)
Touching with break Excessive sludge in the bowl Bearing failure Motor running at overload One phase power failure (Single phasing) Sump oil level too high Vertical shaft and horizontal shaft are out of alignment
How to adjust purifier bowl height ?
By shim by bowl body
Effect of reduced purifier bowl height ?
Oil goes through the water outlet.
Why need sealing water ?
To seal the water outlet & to prevent the overflow of oil from the water outlet.

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