International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 09 Issue: 06 | Jun 2022
p-ISSN: 2395-0072
www.irjet.net
A Study of Variation in Viscosity–Temperature Relationship with Time of Use of Lubricant Nitish Kumar Sah1, Pooja Nand2, Manoj Kumar3 1, 2,3Mechanical
Engineering Department, BIT Sindri, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - Lubricants are used to reduce friction and wear
in machine parts with surfaces in relative motion. Viscosity is one of the most important property of the lubricant. The load bearing capacity of the lubricant depends on its viscosity. Viscosity is highly dependent on temperature hence while selecting a oil the viscosity of the oil at normal temperature, the temperature of the application and a proper viscosity temperature relationship is desired. A number of viscosity temperature relationship are available. Oil deteriorates with use time, so the viscosity of the oil also gets changed. Very few work is available to investigate the variation of viscosity temperature relationship with the time of use. It is highly desirable in deciding whether the oil has reached its limit of useful life and needs a replacement. The present work attempts to investigate the viscosity time relationship of a lubricating oil used in drill rig. Chronological samples have been collected and using one of the common available Viscosity-Temperature relationship, the variation in this relationship with time has been studied. Key Words: lubricant, lubricating oil, viscosity, temperature, age
1. INTRODUCTION Lubricants are used to reduce friction and wear at the interface of two surfaces in relative motion. It is also used to transfer heat, clean the surface, prevent the surface from contamination and reduce noise & vibration etc. It also used as a medium to detect the condition of machines. Generally lubricating oil contains either mineral base or synthetic base oil and less than 10% additives. There are so many physical and chemical properties of lubricating oil like viscosity, oxidation stability, thermal stability, viscosity index, evaporation and volatility, flash point, pour point etc. Out of all these properties viscosity is the most important property of lubricant. It is defined as the internal resistance offered by one layer of fluid to the adjacent fluid layer. It decides the ability of the lubricant to form the film on the surfaces and the load bearing capacity of the lubricant film. Higher the viscosity more will be load bearing capacity. But, High viscous oil required to more power for sheared it and because of that power losses will be higher and more heat is generated and as result increase in temperature of the contacting surfaces which lead to the failure of machine component parts. Viscosity of different oil varies at different rates with temperature and shear rate. Therefore the knowledge of the characteristics of viscosity of lubricating oil © 2022, IRJET
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is very important in the design and prediction of the behaviour of mechanical components. A lubricant in service is subjected to a wide range of conditions which can degrade its base oil and additive. Such factors include heat, moisture, internal or external contamination, process ingredients. Bair scott., et. al., (2001) shows the variation of viscosity and pressure for both very short times of shear and compression and long times of shear and compression. And compared with Hertz zone of EHL (Elastohydrodynamic Lubrication) films for the viscous regime of traction. Yunus syarifah., et. al., (2013) compare the viscosity index and wear elements such as lead(Pb) Iron(Fe) Aluminum(Al) Silver(Ag) Tin(Sn) and Copper(Cu) of two engine oil Perodua Genuine (PG) oil SAE5W-30 and Castrol Magnatec (CM) oil SAE5W-30 using optical emission spectrometer. Oyedeko.K.F.K. Akinyemi., et. al., (2018) found the trend of viscosity variation with temperature so that a suitable lubricating oil for petrol automotive engines could be selected. Jakobsen M.O., et. al.,(2020) done analysis on grease lubricated ball bearing run under load which initiated the vibration. And show a correlation between lubrication ratio and spectral kurtosis for a given frequency band. Singh A.K., et. al., (2006) have studied the variation of viscosity with temperature and time. They have attempted to find viscosity-temperature-time correlation for heavy earth moving equipments used in coal mines.
2. The Case Study To investigate the trend of viscosity-temperature variation with time for lubricant used in generator set, a viscositytemperature relation is used which is given by Walther’s, to find correlation between them. For this work, engine oil samples were collected from a drilling rig generator set provide power to E-1400-16, used in land drilling rigs application at Oil & Natural Gas Corporation (ONGC) Rajahmundary Asset. A drilling rig is an integrated system that drills wells to explore crude oil and natural gas from mother earth's subsurface. At drilling rigs there were four set of generator which equipped with Cummins make engine. Hence to operate all the main components of drilling rigs needs power which supplied by this Cummins make engines. Engine oil sample collected from Cummins make engine (model KTA50G3) and it is a 4-stroke, V-16 cylinder Diesel engine. Its engine capacity is 1430 KVA. Engine oil used in these Cummins make engine was multi grade SAE15W 40, which had a scheduled drain off time 500 hours. Five samples were collected including fresh oil. ISO 9001:2008 Certified Journal
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