By W. L. Robertson
Publication via Robertson, W. L.
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Additional resources for Lubrication in Practice
Sample text
Although there are no arduous lubrication requirements such as require a load-carrying or anti-wear additive, turbine oils must be amongst the most technologically advanced lubricants to combat the conditions encountered. TYPES OF TURBINE Steam turbines Steam turbines can be classified generally as: (a) large units used for driving alternators for the production of electricityl']; (b) smaller units for auxiliary and LUBRICATION OF WATER AND STEAM TURBINES 51 industrial electricity generation; and (c) small industrial units used for driving equipment such as blowers , pumps and compressors.
The combined effect of cylinder pressure and the presence of sulphur trioxide thus creates conditions where it is extremely likely that condensation of water vapour will occur . Sulphur trioxide has a strong affmity for water and it will readily combine with the condensed water to form corrosive sulphuric acid. The cylinder jacket temperatures may be directly related to the degree of corrosive wear DIESEL AND PETROL ENGINE LUBRICATION 33 experienced. In general, raising the temperature of the cooling fluid in the cylinder liner jacket can minimise the problem.
Corrosive wear- caused by the acidic products of combustion. Abrasive wear- caused by hard foreign matter drawn into the cylinder with the air charge and by hard particles of carbon, asphalt, wear debris and ash-forming constituents from the fuel or lubricant. All three causes are undoubtedly inter-related and can occur simultaneously, particularly in a diesel engine. Whilst these causes are accepted as normal wear hazards, their individual or multiple effects can be controlled by proper attention to operating conditions and selection of an appropriate lubricant.