Effect of heating interval and contamination with water on lubricant viscosity in asteam turbine system

Dissertant

Bahnam, Ronnie Hikmat

University

University of Technology

Faculty

-

Department

Department of Electromechanical Engineering

University Country

Iraq

Degree

Master

Degree Date

2008

English Abstract

Lubricant viscosity is the most important property of lubricating oils which restricts the life of lubricant.

Lubricant viscosity is affected by several factors that make its value undesirable and outside the working range.

This research 15 to study the effect of two of these factors, which they are heating interval and contamination with water, and their effect on kinematic viscosity at atmospheric pressure for steam turbine lubricating oil, through experimental work, which was carried out after assembling a test equipment.

This equipment allows the application of heat on a quantity of the same lubricant (IS032) grade used in steam turbine, for a specified temperature and time interval.

It also allows the contaminating of this lubricant with a particular water contents.

The values of these factors are chosen to represent the inspected real working conditions of steam turbine lubricant at south Baghdad thermal power plant.

Experimental heating intervals were (0, 20, 40, 60, S0S 100) hours.

Heating temperature was 60C.

Water contamination of oil expressed as a percentage is chosen to be (0, 0.3, 0.6, 0.9, 1.2, 1,5) %.

Kinematic viscosity was measured using glass viscometer.

Water content in oil was measured using centrifuge method.

The combined effect of both factors is represented by several viscosity-temperature diagrams, to show the effect of factors interaction on kinematic viscosity for the range of temperatures from (30 to 100) C Regression analysis is used to find the relation between both factors and kinematic viscosity of turbine oil, which includes the determination of an empirical model, that gives acceptable viscosity values in comparison with actual values. The important results of this research show that kinematic viscosity of oil decreases as heating interval increases as for the above intervals by (4.7, 12, 19.6, 27,1, 34,2) % respectively.

Also, it decreases as contamination with water increases as for the above ratios by (1.1, 2.3, 3.6, 4,9, 6,9) % respectively.

In addition the viscosity of oil samples decreases in non-linear form as temperature increases from (30 to 100)°C during viscosity test The decrease in kinematic viscosity due to heating approximately reaches unrecompensed level at 40 hours as experimental heating interval, while the decrease in kinematic viscosity of oil due to contamination with water reaches unrecompensed level when water content in oil exceeds 1.5%.

Main Subjects

Mechanical Engineering

Topics

• Lubrication

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-305392