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Properties of Hydraulic oil - oil hydraulic and pneumatic

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Discription about hydraulic oil
What is hydraulic oil
Function about hydraulic oil
Advantage and disadvantage

Veröffentlicht in: Ingenieurwesen
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Properties of Hydraulic oil - oil hydraulic and pneumatic

  1. 1. Oil hydraulics and Pneumatics (2171912) Topic :- Properties of Hydraulic oil Branch : Mechanical 7th D1 Prepared by: Sajan Gohel (160123119010) Submitted to: Prof.:- Maulik Shukhdiya
  2. 2.  They are the medium by which power is transferred in hydraulic machinery  A liquid such as oil or water that is used to generate power in a hydraulic system.  Examples of equipment that might use hydraulic oils include and backhoes, brakes, power steering systems,
  3. 3. transmissions, aircraft flight control systems, elevators and industrial machinery. Hydraulic systems like the ones mentioned above will work most efficiently if the hydraulic fluid used has low compressibility.
  4. 4.  Low temperature sensitivity of viscosity;  Thermal and chemical stability;  Low compressibility;  Good lubrication (anti-wear and anti- stick properties, low coefficient of friction);
  5. 5.  Hydrolytic stability (ability to retain properties in the high humidity environment);  Low pour point (the lowest temperature, at which the oil may flow);  Water emulsifying ability;  Filterability;  Rust and oxidation protection properties;
  6. 6.  Low flash point(the lowest temperature, at which the oil vapors are ignitable);  Resistance to cavitations;  Low foaming;  Compatibility with sealant materials.
  7. 7.  The primary function of a hydraulic fluid is to convey power.  Protection of the hydraulic machine components.  Heat transfer  Sealing medium  Lubricant
  8. 8. Base Stock The original hydraulic fluid, dating back to the time of ancient Egypt, was water. Beginning in the 1920s, mineral oil began to be used more than water as a base stock due to its inherent lubrication properties and ability to be used at temperatures above the bp of water. Today most hydraulic fluids are based on mineral oil base stocks.
  9. 9.  Natural oils such as rapeseed used as base stocks for fluids where biodegradability and renewable sources are considered important.  Other base stocks are used for specialty applications, such as for fire resistance and extreme temperature applications. Some examples include: glycol, esters, organophosphate ester, polyalphaolefin, propylene glycol, and silicone oils.
  10. 10.  Environmentally sensitive applications may benefit from using biodegradable hydraulic fluids based upon rapeseed, vegetable oil when there is the risk of an oil spill from a ruptured oil line. Typically these oils are available as ISO 32, ISO 46, and ISO 68 specification oils. Guide for Assessing Biodegradability of Hydraulic Fluids Standard Classification of Hydraulic Fluids for Environmental Impact are relevant.
  11. 11.  Special, stringent care is required when handling aircraft hydraulic fluid as it is critical to flight safety that it stay free from contamination. It is also necessary to strictly adhere to authorized references when servicing or repairing any aircraft system. Samples from aircraft hydraulic systems are taken during heavy aircraft maintenance checks to check contamination.
  12. 12.  Because industrial hydraulic systems operate at hundreds to thousands of PSI and temperatures reaching hundreds of degrees Celsius, severe injuries and death can result from component failures and care must always be taken when performing maintenance on hydraulic systems.  Fire resistance is a property available with specialized fluids.
  13. 13.  Higher efficiency  Better performance  Environment friendly  Can be used at very extreme temperatures  Also works as lubricant while transmitting power
  14. 14.  Higher heat transfer capability than water  Also acts as a sealing medium  No wear as the working parts are not in contact.
  15. 15.  A constant high pressure is required to be maintained.  Leakage may occur.  Aeration may occur through the pump causing noisy operation, power lag, knocking etc.