oil, lubrication, fuel, diesel, heavy fuel oil, redwood, flash point, additive, detergent, viscosity, acidity, anti foam, emulsify, petroleum, vegetable, internal combustion engine, boiler, bunkering, bunker, fuel oil

Lubrication Oil

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oil, lubrication, fuel, diesel, heavy fuel oil, redwood, flash point, additive, detergent, viscosity, acidity, anti foam, emulsify, petroleum, vegetable, internal combustion engine, boiler, bunkering, bunker, fuel oil


Checking the oil levels


Steam is used to atomize the fuel into fine particles


High sulfur fuel oil produces acid that will corrode the cylinder liners

Lubricating Oil for the machinery

The marine engineer has to handle various kinds of oils. Taking on fuel oil during bunkering, he must be able to know the quality of the oil he is taking on. When lubrication oil has deteriorated, he must be able to determine how much has been deteriorated and whether he can still continue to use the oil.

Important Properties of Lubrication Oil

The important properties to look out for are the following:

  • Viscosity
  • Viscosity Index
  • Pour Point
  • Oxidation Resistance
  • Flash Point, Fire Point
  • Alkalinity

Additives

Some of the additives put into the lubrication oil are as follows:

  • Anti Oxidant - Amines, Phenols
  • Corrosion Inhibitor
  • Detergent and Dispersant - Ca, Ba, Compounds, Soaps
  • Alkalinity - Ca, Ba Hydroxides
  • Anti Bacterial - Biocides
  • Oiliness or Wetting Agents - fatty oils, chlorinated wax
  • Extreme Pressure Agents - organic compounds of Cl, S, P (hydraulic, gear oil)
  • Pour Point Depressant - Organic polymers (alkyl naphthalene) (Steering gear, refrigerator)
  • Anti foam - Silicones
  • Viscosity Index Improvers - organic polymers
  • Emulsifying Agent - Polar Compounds (emulsifying but do not lose lubricating property)

Lubrication Oil Change (A rough guide)

When do you know that the oil need to be changed? Below is a rough guide:

  • Viscosity
    • 10% change in viscosity, or
    • ±one SAE grade (e.g. SAE 30 changed to SAE 40)
  • Flash Point
    • Dropped to 150 degree C
    • Danger of crankcase explosion
  • Water Content
    • 1/2% - Use purifier to remove the water.
    • 2% - Change the oil
  • TBN
    • 20% of the TBN of a new oil
  • Insoluble Content
    • 5% max

The contents of this page is part of a page from my e-book "General Engineering Knowledge Notes" that will help candidates prepare for the Certificate of Competency Examinations. This e-book is available for FREE downloading here.

© 2004 Yoon Chee Tuck    Contact me

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