Marine Purifier Parts and Functions

Marine Purifier Parts and Functions

Purpose of multi-disc inside the purifier

• Separate the liquid into a thin layer & create a shallow settling distance between discs.
• Improving separation of oil from heaver liquids & solids particle

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.

Choosing the correct size of gravity disc

• The correct size is selected using:
• Separation temperature
• The density of oil at this temperature
• Desired throughput of oil and by using of nomogram from the purifier manual.

Adjusting purifier bowl height

• By shim by bowl body

Effect of the reduced purifier bowl height

• Oil goes through the water outlet.

Sealing water purpose

• To seal the water outlet & to prevent the overflow of oil from the water outlet.

Water washing

• Water washing is a widely used technique 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 continuously renews the water seal in the purifier bowl.
• The oil temperature should be around 75 °C and the water temperature about 5 °C higher than the oil.
• It can be done continuously or intermittently.

Steam jetting

• By blowing steam into the engine lube oil just pair to its purification.
• Coagulation of colloidal carbon will occur.
• Purifiers will remove this carbon more effectively.

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.

Change purifier from HFO to DO

• Replace the gravity disc, which is smaller than the heavy oil
• Open heater bypass valve.
• Close the FO heater steam in/out valves.
• Open heater drains v/v.
• Pure DO purifier cannot change to HFO, it has no heater.
• A pure clarifier cannot change to a purifier, it has no water outlet.

Cause of excessive vibration on the purifier

• Sludge too much inside the bowl
• Foundation damper & spring failure
• Bearing failure
• Worn gear
• Uneven wear of the frictional clutch
• Motor speed too high or too low

Reasons for purifier overflow

• 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 a main sealing ring

The 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
• The vertical shaft and horizontal shaft are out of alignment

Needs to update more please write us at marinersight@gmail.com