The Role of Temperature and Environment Even if a hydraulic fluid is classified as combustible, the operational temperature of the system is the critical variable in determining if ignition will occur. Segregation from strong oxidizers, such as chlorine or nitric acid, is mandatory, as these chemicals can react violently with hydrocarbons.
Hydraulic Oil Flammability and Oxidizer Segregation: Understanding the Risks
Hot surfaces above 400°C (750°F) can auto-ignite hydraulic fluid upon contact. Defining the Flash Point in Hydraulic Fluids To determine if hydraulic oil is flammable, one must first look at the technical definition of the flash point, which is the lowest temperature at which a liquid produces enough vapor to form an ignitable mixture with air near the surface of the liquid.
Conventional mineral oils are refined from crude oil and generally possess higher flash points, making them less prone to ignite at typical operating temperatures. While often categorized as combustible rather than highly flammable, the risk they pose in the presence of ignition sources, high temperatures, or system failures is significant and demands a nuanced approach to handling and storage.
Hydraulic Oil as an Oxidizer: Segregation Requirements from Strong Oxidizers
Pressurized systems can create aerosols that ignite more easily than pooled liquid. However, synthetic alternatives, such as those utilizing glycol or ester bases, often exhibit different thermal characteristics, with some formulations designed for high-temperature stability pushing these limits significantly higher.
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