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Mobil SHC 824

Mobil SHC 824 is a supreme performance, synthetic turbine oil designed specifically to meet the needs of the most severe marine and industrial gas turbine applications. It has a nominal 10,000 hour TOST life and is recommended for the lubrication of marine and land-based gas turbines, particularly units under 3,000 hp used as standby power units. This innovative product is formulated from wax-free synthesized hydrocarbons and a unique additive system. This formula provides outstanding low temperature fluiditiy and exceptional resistance to degradation at high temperatures well beyond the capabilities of premium quality mineral oils. Mobil SHC 824 lubricant also provides excellent antiwear properties as well as protection against rust and corrosion. It has good air release performance and resistance to foaming.

Mobil SHC 824 provides superior resistance to thermal/oxidative degradation during the heat soaking period after shutdown and permits rapid oil circulation at low temperatures during start-up. Degradation resistance is a key attribute in avoiding harmful deposits that can interfere with lubrication supply to the bearings or foul critical servo-valves. This is a particular issue when gas turbines are running in cycling mode and experience multiple thermal stress cycles. Since low temperature fluidity and high viscosity index are inherent characteristics of this fluid, it does not change in service as a result of mechanical shearing or repeated cycling from low to high temperatures.

This advanced product, which has been proven in very severe gas turbine service over many years, is preferred by users because of its outstanding stability and equipment protection under the most severe, high temperature conditions and because of its easy start-up at low ambient temperature. This performance results in excellent equipment reliability and minimised downtime

Features and Benefits

The Mobil SHC brand of lubricants are recognised and appreciated around the world for their innovation and outstanding performance. These molecular design synthetic products, pioneered by ExxonMobil research scientists, symbolise the continuing commitment to using advanced technology to provide outstanding products. Mobil brand products have also been the choice for turbine operators worldwide since they were first commercialized more than one hundred years ago. During that period ExxonMobil technical experts have worked with with OEMs to ensure that Mobil product offerings would provide exceptional performance in the continually evolving turbine equipment designs. Familarity with evolving designs and operational conditions is a key input to the application of the best lubricant technology in the development of products that will provide the performance demanded by users.

One general trend over the years has been to higher power output designs, which can lead to greater thermal stress on the lubricant. This thermal exposure is exacerbated by cycling operation which is employed by gas turbine operators to manage the supply/demand balance of electrical power generation, which results in heat soak-back at each shut-down sequence. Resisting thermal degradation is thus a key property required of a modern gas turbine oil lubricant.

To combat high thermal exposure of the oil, ExxonMobil product formulation scientists chose proprietary synthetic base oils for Mobil SHC 800 Series oils because of their exceptional thermal/oxidative resistance capabilities. Formulators chose specific additives that would maximise the benefits of the synthetic base oils to provide exceptional oil life, deposit control and resistance to thermal and chemical degradation, as well as the balance of the performance features. The wax-free nature of the synthetic base oil also provides low-temperature fluidity characteristcs unmatched by mineral products and is a key benefit for remote, low ambient applications.

Key features and benefits of Mobil SHC 824 include:

Features Advantages and Potential Benefits
Outstanding high thermal/oxidative stability and deposit control High level of resistance to heat soak-back after turbine shutdown
Less deposit build-up and improved reliability and lower maintenance costs
Long oil charge life and lower product costs
Excellent low temperature fluidity Reliable flow and lubrication during cold starts, even at very low temperatures
Naturally high Viscosity Index Improved equipment protection at high temperatures
Very good resistance to foaming and good air release Efficient system operation and less unplanned stoppages
Excellent antiwear performance Excellent equipment protection and reduced equipment replacement costs

Applications

Mobil SHC 824 is designed specifically to meet the needs of the most severe gas turbine applications. It is fully compatible with mineral oils, but admixture will detract from its superior performance properties.