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Chapter 15: GAS TURBINE LUBRICATION AND FUEL SYSTEMS By Philip Kiameh

From Power Generation Handbook: Selection, Applications, Operation, and Maintenance

GAS TURBINE LUBRICATION SYSTEMS

A single lubricating system is usually used for heavy-frame gas turbines and driven equipment using mineral oil. Some applications use synthetic lubricating oil due to its fire-resistant property. Common oils used in these machines have a viscosity of 32 centistokes (cSt). However, higher-viscosity oils can be used in high-ambient-temperature areas. Heavy-frame and power turbines use oil-film bearings. Aeroderivative (aero) gas turbines have two lubricating systems. The first is for the aero gas generator where the rotors are carried on ball-and-roller antifriction bearings. This system uses the same synthetic oil that was used in the parent aero engine. Most aeronautical oils used today meet or are very similar to two military specifications, MIL-7808 and MIL-23699. Modern engines use the latter oil due to its high-temperature capability. The second lubricating system is used for power turbines and driven equipment using oil similar to that used in heavy-frame machines. The system for the aero gas generator uses an oil cooler to reject the heat removed from the engine to the atmosphere or to a glycol-and-water cooling loop, which rejects the heat to atmosphere. In some liquid-fueled installations, the lubricating oil is cooled in a shell-and-tube heat exchanger by the incoming fuel. Heavy-frame machines, power turbines, and driven equipment of most aero installations have a separate lubricating system tank with heaters to maintain the required temperature. The main pump is driven by an alternating current (AC) motor or by the shaft while the auxiliary pump is usually driven by an...

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Products & Services Microturbines Microturbines are small fuel-burning turbines used in localized or mobile power generation and mechanical drive applications. Learn more about Microturbines

Quenching Oils and Heat Treatment Fluids Quenching oil and heat treatment fluids are designed for rapid or controlled cooling of steel or other metal as part of a hardening, tempering or other heat-treating process. Search by Specification | Learn more about Quenching Oils and Heat Treatment Fluids Steam and Gas Turbines Steam turbines and gas turbines are rotating machines that extract energy from pressurized steam and/or from combustion gases. Learn more about Steam and Gas Turbines | Steam and Gas Turbines Insights Industrial Lubricants Industrial lubricants are oils, fluids, greases and other compounds designed to reduce friction, binding or wear and exclude moisture. Specialized characteristics may enhance thermal conduction across thermal interfaces or reduce electrical resistivity across electrical ts. Search by Specification | Learn more about Industrial Lubricants | Industrial Lubricants Insights Petroleum and Mineral Oil Products Petroleum products and mineral oil products include substances such as fluids and greases. Search by Specification | Learn more about Petroleum and Mineral Oil Products

Topics of Interest Chapter 16: GAS TURBINE BEARINGS AND SEALS BEARINGS Journal bearings provide radial for the rotating equipment and thrust bearings provide axial positioning for them. Ball and roller bearings are used in some aircraft jet engines. Index Page numbers with t denote tables; those with f denote figures A A286 alloy, 445 Abrasives, for turbine cleaning, 486 487, 708, 816 817, 893 Absolute velocity, 117, 356... Applications of Lubricants Applications of Lubricants Lubricants are primarily used to reduce friction stress between surfaces. They have the following uses: As antiwear, antioxidants, and antifoaming agents. As... Market Application Publication: Power Plant Turbine Vent Filters (.pdf) Most electrical power is generated with high efficiency turbines which drive an electromagnetic induction generator. The turbines require large volumes of oil to continually lubricate the internal... Predicting lube life Heat and contaminants are the biggest enemies of bearing grease and oil. Unless bearings come prelubricated and sealed from the factory, they will periodically need a change of lubricant. How often... Product Announcements Environmental Technology Applications Lechler, Inc. Gas Power Microsite Cummins Power Generation

Cymbet Launches EnerChip Energy Processor Cymbet Corporation View More Product Announcements for Microturbines    

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