What is Lube Oil System in Gas Turbine Engines?

Gas Turbine
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There are several different components that make up a gas turbine’s lube oil system. These components include pumps, filters, bypass valves, and oil pressure regulating valves for proper functioning in Oil & Gas Engineering Solutions company. Let’s look at each of these components to better understand how they work. Also, learn about the importance of lubrication.

Components lube oil system

Filters

The lube oil system in a gas turbine is composed of various filters. The main filter is a five micron pleated paper filter, installed after the lube oil heat exchanger. Another filter is a duplex filter. The oil is directed through the filter according to a transfer valve. If the main filter fails to meet the required standard, a standby filter is filled with oil until solid oil flow appears in the flow sight. This condition signals that the standby filter is ready to be brought into service.

Filters in lube oil system in gasoline turbines are used to protect the turbine from contaminants and corrosion. In addition, the filters also help in managing the temperature and pressure. The filters in the lube oil system ensure that the lube oil is vapor-tight and free of air and water. Filters in the lube oil system are essential to ensure optimum performance.

Pumps

A gas turbine’s lubrication system includes pumps that deliver oil to the turbine’s turbine blades. These pumps are usually simple volumetric pumps operated by a shaft that drives the turbine. However, they cannot be adjusted independently of the engine’s speed, which means they may not be responsive to the actual lubrication needs of the engine.

Two pumps are necessary in a gas turbine’s lube oil system: a shaft-driven main lube pump and an auxiliary control oil pump. The latter supplies the pressure needed by the governing actuators and acts as a trip circuit that can manually trip the turbine in an emergency in oil & gas engineering company. Both pumps are controlled by a pressure switch located in the process line. If the pressure switch is triggered, the auxiliary pump will automatically start running and keep running until the turbine reaches 95 per cent of its operating speed.

Bypass valves

A bypass valve in a gas turbine lube oil system opens and closes depending on the oil pressure in the oil passages. This control is provided by a microchip, a commercially available device, which processes input signals and produces an appropriate opening and closing signal. It is wired to a motor 38 that is powered by an external power source.

A gas turbine lube oil system should be operated within recommended temperature ranges, or else the lube oil will degrade and produce harmful varnish on component surfaces. This varnish deteriorates bearings and seals. Keeping the operating temperature within recommended limits increases system availability and reduces maintenance costs. Thermal bypass valves are designed using the latest thermal actuator technology, enabling them to be compact, low-mass, reliable, and fast-acting.

Oil pressure regulating valves

The oil pressure regulating valves of the lube oil system in gas turbines help regulate the oil pressure in the turbine. They can be hydraulic or pneumatic. The hydraulic valves respond to changes in pressure by diverting oil from the input pump to an alternate outlet port. The valves control oil flow to cool turbine engine parts.

The lube oil system consists of a number of separate components. First, there is the lubrication pump that supplies cool and clean oil to the turbine’s mechanical components. Another component of the lubrication system is the hydraulic shaft position indicator, which receives oil from the lube oil system. There are also several different locations where pressures and temperatures are measured in the hydraulic system. These locations are usually on the discharge and suction sides of each compression stage. The pressure and temperature data is then transmitted to a monitoring station.

Long-life lubricating oil

Long-life lubricating oil in a gas turbine is critical to maintaining the performance and efficiency of this equipment. There are a number of options available, from petroleum-based products to synthetic oils. The right product can increase turbine performance and increase turbine uptime. Some manufacturers recommend certain blends of synthetic oil for their gas turbines, which can be more beneficial than others.

Conclusion

Turbine oil users are interested in long-life lubricating oils that reduce their maintenance costs. A quality product should offer sufficient rust and corrosion inhibition, be compatible with seals, and be easy to filter. The best long-life lubricating oil for gas turbines should be complemented by a good oil maintenance program.

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