Tackling varnish formation in turbomachinery - free report

Understanding how varnishes are formed allows turbomachinery operators to make an informed choice of the best maintenance regime for their equipment.

High variable temperatures, oxidation rates, thermal degradation and generation of contaminants can increase the total acid number, which over time develops into insoluble polar compounds that then creates varnish deposits.

This is something that operators need to consider when choosing turbine oil for their machinery, as oil can provide increased resistance to the formation of varnish deposits.

The evolving design and operations of turbomachinery means that oils are more susceptible to stress and varnish formation.

Ever-changing test procedures from equipment manufacturers are increasingly stringent.

However current test procedures predominantly focus on turbine oil oxidation resistance, but don’t always address the oil’s propensity to form varnish, meaning that some turbine oils will not provide adequate protection against deposits.

As customers’ requirements get more complex, products have to evolve and develop accordingly to offer optimum levels of protection and maximise performance.

To prevent damage, turbomachinery operators need to use a turbine oil designed to extend oil life, reduce varnish and protect components.

Expert services such as Shell LubeChat and LubeAnalyst also allow operators to understand the condition of their oil and equipment, to put in place measures that can boost efficiency.