Which hydraulic fluid is commonly chosen for fire resistance in hydraulic systems?

Which hydraulic fluid is commonly chosen for fire resistance in hydraulic systems?

• A. Mineral oil
• B. Phosphate ester (FR)
• C. Water
• D. Polyalkylene glycol esters

Answer: (B)

When a hydraulic system must resist catching fire, the fluid chosen should resist ignition and have a high flash point. Phosphate ester fluids labeled FR are specifically formulated to be fire-resistant, giving them a high resistance to ignition and making them a common choice in environments where fire risk is a concern. They also provide good lubrication and stability under heat, which helps protect pumps and actuators in demanding conditions. Mineral oil, while common, is flammable and can ignite under high heat. Water-based fluids reduce fire risk but bring significant drawbacks such as poor lubrication for pumps, potential corrosion, and compatibility issues with seals and metals. Polyalkylene glycol ester fluids can be fire-resistant as well, but they’re not as widely adopted as phosphate esters due to cost and compatibility considerations. So, the phosphate ester (FR) fluid best fits the goal of fire resistance in hydraulic systems.

When a hydraulic system must resist catching fire, the fluid chosen should resist ignition and have a high flash point. Phosphate ester fluids labeled FR are specifically formulated to be fire-resistant, giving them a high resistance to ignition and making them a common choice in environments where fire risk is a concern. They also provide good lubrication and stability under heat, which helps protect pumps and actuators in demanding conditions. Mineral oil, while common, is flammable and can ignite under high heat. Water-based fluids reduce fire risk but bring significant drawbacks such as poor lubrication for pumps, potential corrosion, and compatibility issues with seals and metals. Polyalkylene glycol ester fluids can be fire-resistant as well, but they’re not as widely adopted as phosphate esters due to cost and compatibility considerations. So, the phosphate ester (FR) fluid best fits the goal of fire resistance in hydraulic systems.