The end of a turbine oil’s life is usually determined when the antioxidants are at 25% compared to new. Antioxidants are a powerful ingredient in turbine oil formulations even though they make up about 1% of their composition. In most cases when turbine oil is changed, 99% of the turbine oil (base oil) is still is great shape. This article reviews the economically attractive option of antioxidant replenishment while mitigating any associated risks.
A fundamental property of a turbine oil is its ability to separate from water, also referred to as its demulsibility characteristics. This is an important characteristic to maintain in turbine oils to protect components from inadvertent damage. Understanding turbine oil’s demulsibility will also ensure that the correct water removal technology is selected.
Electrostatic Spark Discharge (ESD) is a phenomenon that occurs when oil generates sufficient static electricity to form sparks. This form of oil degradation has been studied extensively in many systems, including large frame gas turbines. Although most power plants are now aware of this form of turbine oil degradation, there is insufficient clarity on how critical of an issue ESD is. Read on to learn more.
The industry standard for determining when to change your turbine oil is when the antioxidants deplete to 25% of their original level. An accepted practice to extend the life of your turbine oil has been “bleed and feed”. This practice is the most expensive way of replenishing your antioxidants and managing your turbine oils. Let’s look at why.
Innovative solutions to address lube varnish in hydrogen seals
This paper discusses how varnish will impact hydrogen seal performance and identifies the three stages of varnish found in hydrogen seals. It also provides some innovative solutions to prevent varnish from impairing seal performance or failure. Finally, two case studies are presented which highlight different approaches to solving this problem.
How to increase varnish mitigation performance by incorporating customizable ESP media
Varnish is widely accepted as a lubricant failure mode in many applications such as turbine, hydraulic and compressors. hat are in suspension either by electrostatic separation or filtration. However, it has been found that most degradation products in an operating system are in solution rather than in suspension. Read on.
Fluitec - Interpreting results for the new ASTM standard for varnish potential (D7843) - Thoughts
Traditional oil analysis techniques have been ineffective at predicting the onset of deposit problems in turbine oils – often defined as varnish. This has led to the commercialization of several new analytical tests which measures oil degradation products
When selecting turbine oils, look beyond the spec sheet
Ideally, a power plant selects a turbine oil that provides long life, free of performance problems, clear indicators of when the fluid needs to be changed and is provided by a dependable, knowledgeable supplier. It is more difficult than it appears however to choose such a fluid.
The most common turbine oil selection criterion is not necessarily the best
Performing oil analysis tests to determine the presence of varnish in a system is challenging for a few reasons. The sample of oil that is obtained for analysis may not be indicative of the condition of the lubricating system. If the lubricant in a heavily varnished system is changed without performing a flush to remove the deposits, the new oil may initially indicate a low varnish potential even though there are deposits throughout the system.
The myth about a brilliant scientist developing a new invention to change our world is exactly that…a myth. It is well accepted that scientists, engineers and practitioners of all walks of life build upon other’s thoughts, inventions and ideas.