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Lubricants for thermal power plants
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.
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.
a petroleum oil,
a synthetic oil,
or in rare specialized instances, vegetable oil.
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.
Surface Protective additives
Performance Enhancing additive
Lubricant protective additives
Viscosity index improver
Pour point depressant demulsifier emulsifier
Lubricity additives Antiwear additives
Extreme pressure additive
Corrosion & rust Inhibitor additives
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.
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
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.
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.