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Basic Lubricant Knowledge
BY: AUNG KHAING HTUN LUBE ENGINEER MJL & AKT PETROLEUM LTD.
AIM
• To get knowledge about lubricants and additives
• To know types of lubricant
What is lubricant?
Properties of lubrication
Basic Lubricant Knowledge
Classification of lubricantsAdditives
What is lubricant?
• The substances which are used to decrease the force of friction between the moving parts of machine in contact
• All liquids will provide lubrication to a degree• There are two main groups, oil lubricants and grease
lubricants
Basic Lubricant Knowledge
Properties of lubricant• Viscosity• Viscosity Index• Pour Point• Flash Point• Consistency or penetration number (Grease)• Dropping Point (Grease)• Structural Stability
Basic Lubricant Knowledge
Viscosity
• One of the main properties of any oil lubricant• Is the measure of a lubricant’s resistant to flow• Measured by petroleum industry in centistokes,
which numerically equal to mm2/s• First consideration in selecting lubricant oil for
specific applications
Properties of lubricant
ViscosityProperties of lubricant
Operation condition VS viscosity needed
• Higher load requires high viscosity• Higher temperature requires higher viscosity• Increased speed requires lower viscosity
Viscosity index
• The property of resisting changes in viscosity due to changes in temperature
• The higher the VI number of oil, the less tendency for its viscosity to change with the changes in temperature
Properties of lubricant
Pour Point
• The lowest temperature at which the oil will flow
Properties of lubricant
Flash Point
• Minimum temperature at which sufficient liquid is vaporized to create a mixture of fuel and air that will burn if exposed to a source of spark
Properties of lubricant
Consistency or penetration number (grease)
• Is defined as its resistibility to deformation under an applied force, in other words its relative stiffness or hardness
Properties of lubricant
Dropping point
• The temperature at which the oil separates from the thickener
Properties of lubricant
Structural stability
• The ability of the grease to resist changes in consistency during mechanical working
Properties of lubricant
Classification of lubricantsBased on condition• Solid lubricants• Semi solid lubricants• Liquid lubricantsBased on use• Automotive lubricants• Industrial lubricants• Special lubricants
Basic Lubricant Knowledge
Classification of lubricants (Cont’d)Based on grade• Multi grade lubricants• Mono grade lubricantsBased on source• Mineral based lubricants• Synthetic based lubricants
Basic Lubricant Knowledge
Mineral based lubricants
• The mineral lubricants get from crude oil through refine.• Need to add additives, usually 10%
Classification of lubricants
Synthetic based lubricants
• Is a lubricant consisting of chemical compounds that are artificially made (synthesized).
• Synthetic lubricants can be manufactured using chemically modified petroleum components rather than whole crude oil
Classification of lubricants
Semisolid lubricants
• Greases• An oil with thickening agent added
Classification of lubricants
Solid lubricants
• There are many types of solid lubricant used for different applications
• Synthetic, metallic or mineral powders such as PTFE (Teflon), copper, graphite
Classification of lubricants
AdditivesBasic Lubricant Knowledge
Question?
THANKS!