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Lubricants for thermal power plants


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Lubricants for thermal power plants

  1. 1. Lubricants for Thermal Power Plants SHIVAJI CHOUDHURY
  2. 2. Introduction 1. The proper selection and use of lubricants, as well as the care and operation of lubricating systems, is an essential part of any maintenance program. 2. To choose an appropriate lubricant for a particular application and to maintain the lubricant’s effectiveness, a basic understanding of lubrication theory and the characteristics of lubricants can be very beneficial.
  3. 3. Fundamentals of lubrication  The basic purpose of a lubricant is to reduce friction and wear between two surfaces moving relative to one another.  In most cases, a lubricant also dissipates heat, prevents rust or corrosion, acts as a seal to outside contaminants, and flushes contaminants away from bearing surfaces.
  4. 4. Oil and Grease Requirement
  5. 5. Lubricant oil 1. A lubricating oil is composed of a base stock blended with various additives to enhance performance and maintain quality. 2. The base stock may be  a petroleum oil,  a synthetic oil,  or in rare specialized instances, vegetable oil.
  6. 6. Lubricant oil characteristics  Viscosity  Viscosity index  Pour point  Flash point  Fire point  Neutralization number
  7. 7. Additive in lubricant 1. Additives present in a lubricant improve and strengthen the performance characteristics. 2. Chemically active additives are able to interact with metals and form a protective film with the metallic components present in the machinery.
  8. 8. Lubricant additives Surface Protective Additives Performance Enhancing additive Lubricant protective additives Oxidation inhibitors Foam inhibitors Viscosity index improver Pour point depressant demulsifier emulsifier Lubricity additives Antiwear additives Extreme pressure additive Tackness additives Corrosion & rust Inhibitor additives Detergents additives
  9. 9. Common elements found in lube oil additives
  10. 10. Common additives in lubricants
  11. 11. Grease 1. Lubricating grease is a mixture of a lubricating fluid, a thickening agent, and additives. 2. Petroleum oils mixed with a soap thickening agent make up most of the grease in use today. 3. The soaps are formed by the reaction of animal or vegetable fats or fatty acids with strong alkalies such as calcium or sodium. 4. Non-soap thickening agents, such as modified clays and poly ureas, are also used in some instances.
  12. 12. Characteristic of a steam turbine oil  Seven essential characteristics of a turbine oil enable it to perform its critical functions so that a turbine generator unit will operate reliably for long periods.  (1) Maintain viscosity .  (2) Minimize friction and protect against wear .  (3) Transfer heat from the journals, bearing,  (4) Resist oxidation and degradation due to exposure to air (oxygen), water, and hydrogen ,  (5) Resist foaming and air entrainment  (6) Protect other components from corrosion  (7) Separate rapidly from water
  13. 13. Additive in Steam turbine oil  Present-day turbine oils are formulated with a highly refined mineral oil base and a varying number of additives which enhance or impart a specific oil property.  As a minimum, steam turbine oils contain an antioxidant to retard oxidative attack and a rust inhibitor to protect iron-base metals. In addition, an antifoam agent and a metal deactivator may be present.  Depending on the properties of the mineral oil base, other functional additives may be used to achieve the required performance characteristics.
  14. 14. Oil Specification- KWU –BHEL Turbine 500 MW  Oil of viscosity class ISO VG 46 shall be used.  The oil shall be a petroleum product with or without additives to meet the requirement of this standard. OIL SUPPLIER BRAND IOC SERVO PRIME 46 GULF OIL INDIA LTD GULF CREST 46 CALTEX REGEL R&O 46 CASTROL Castrol prefecto t- 46 super clean Indo mobil ltd Mobil DTE medium/DTE 798
  15. 15. FRF oil for turbine control system  Fire Resistant Fluids (FRF) oil recommended for BHEL make steam turbine control system in 500 MW .  According to ISO 6743/4, FRF is a fluid based on triarylphosphate ester marked ISO-L-HFDR.
  17. 17. Lube oil for air preheater
  18. 18. 11.BOWL MILL XRP 1003 500 MW
  19. 19. THANKING YOU Additives Key to Lube Success