Circulating Oils (H3)
Circulating oils are primarily categorized by their base oil type (mineral or synthetic) and are specifically formulated with additives to suit various heavy-duty industrial applications.
Types: (H4)
- Mineral Circulating Oils: Formulated from highly refined petroleum base oils, they are enhanced with specific additives and are widely used for general industrial applications in a range of ISO viscosity grades.
- Synthetic Circulating Oils: These are chemically manufactured to have more uniform molecules and superior properties, such as a much broader operating temperature range and better performance in extreme conditions. They generally offer longer oil life and enhanced performance compared to mineral oils.
- Rust & Oxidation (R&O) Inhibited Oils: Many circulating oils fall into this category (e.g., Mobil DTE Oil Named series). Their primary additive package focuses on providing excellent protection against rust and corrosion, along with high thermal and oxidative stability to prevent sludge and deposit formation.
- Anti-Wear (AW) Circulating Oils: These oils include anti-wear additives for extra protection in systems with components subject to high loads, such as specific types of gears and heavily loaded bearings.
Key Features: (H4)
- Excellent Thermal and Oxidative Stability: This is vital for use in high-temperature systems like paper machine dryer bearings or turbines, as it resists oil breakdown, deposit formation, and sludge, ensuring a long lubricant life.
- Superior Water Separation (Demulsibility): Systems in humid or wet environments (like paper mills) require oils that can quickly shed water. This property is crucial for preventing emulsion formation, which can accelerate wear and corrosion.
- Rust and Corrosion Protection: Additives provide strong protection for internal metal surfaces, even in the presence of water or salt water.
- Good Anti-Wear (AW) Properties: Additives help minimize friction and wear on bearings, gears, and other moving parts, especially under heavy loads.
- Excellent Air Release Properties: This feature allows entrained air to separate quickly, preventing pump cavitation and erratic system operation.
- High Viscosity Index (VI): A high VI ensures the oil's viscosity changes minimally with temperature variations, maintaining a stable protective film thickness across the operating range.
- Contaminant Flushing and Filtration: The continuous flow system helps flush metal particles and other debris away from critical components, and the oil is designed to work effectively with system filters to maintain cleanliness.