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lubricants
This document discusses lubricants, including their types, functions, properties, selection criteria, and applications. Lubricants are substances introduced between moving parts to reduce friction and dissipate heat. The main types are liquids like vegetable and mineral oils, solids like graphite and mica, and semi-solids like greases. Lubricants function to lubricate parts to reduce friction, cool parts by transferring heat, clean surfaces, reduce noise pollution, provide sealing, and protect against wear. Selection depends on factors like pressure, speed, clearance, surface nature, and operating temperature. Key properties include viscosity, viscosity index, pour point, flash point, and carbon residue. Lubricants have important applications in steam turbines, blow
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lubricants
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- 2. Introduction introduction ofa substance between the conta surfaces of moving parts to reduce friction an to dissipate heat.
- 3. Types of Lubricant •Liquid • Solid • Semi solid • Gases
- 4. Types of Lubricant •Liquid • Vegetable oils • Mineral oils • Solid • Graphite, mica • Semi solid • Greases • Gases • Nitrogen • Hydrogen
- 5. Function of alubricant • Lubricate - Reduce friction • Cooling - Heat transfer • Cleaning - Detergency • Noise pollution - dampening • Sealing – prevent leakage • Protection – prevent wear
- 6. Lubricate – reducefriction • The effects of friction • Metal to metal contact • Leads to wear and tear • Generates heat • Results in Power loss
- 7. Cooling • Lube oilremoves heat from all areas and brings it to the engine sump. • Improper cooling can lead to over heating, lead to wear, distortion and failure.
- 8. Cleaning • Cleans carbonand varnish deposits • Flushes the entire system removing • Deposits • Acids • Wear products • Moisture • Removes external contaminants dust, moisture (external)
- 9. Noise reduction • Reducenoise • By preventing metal to metal contact • As between camshaft and tappet
- 10. Sealing • Oil film •Between piston ring and liner • Helps in creating a gas tight seal
- 11. Protection • Protection againstacids and moisture • Very important to increase life of component and equipment
- 12. Selection of criteria Pressurebetween moving parts Speed of moving parts Clearance between parts Natural of friction surface Temperature of operation
- 13. Properties of lubricants Viscosity Viscosityindex Pour point Flash point Carbon residue Reaction Detergent
- 14. Application • Steam turbine •Blower • Boilers • Coal handling plant • Steam generating plant
- 15. AdvantagesAdvantages Oils are indispensablefor dissipation of large amount of heat from the point,at which it is generated. It can carry away dirt or wear products from the rubbing surfaces.
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