If higher than this, the service life of the oil may be shortened and sludge and coke may be deposited which would interfere with the heat transfer rates.Īs with other mineral oils, Mobiltherm heat transfer oils should be used only in systems with forced circulation. In well-designed systems the temperature of the oil film surrounding the heating element should be about 15✬ to 30✬ above the bulk oil temperature. At higher temperatures, fluid life will be shortened because the rate of thermal degradation which increases markedly as temperatures rise above the recommended limit. If the oils are used above their recommended maximum temperatures, vapor lock may result unless the system is designed to operate at the higher temperature by pressurizing with an inert gas such as nitrogen. Long trouble free service life and reduced downtimeĪpplication Considerations: Mobiltherm heat transfer oils should not be mixed with other oils since this may impair the excellent thermal and oxidation stability resulting in a change in other properties, and complicate analyses aimed at determining useful oil life. High heat transfer rates and improved operating efficiency and lower operating costs High resistance to thermal cracking and decompositionįree from sludge and coke deposits and minimum interference with heat transfer capability and minimized maintenance needs Modern refining techniques are a key factor in providing the excellent product features. Mobiltherm oils are important members of the Mobil brand of specialty fluids that have gained a reputation for performance and reliability, even in severe applications. Mobiltherm 600 Series offer the following benefits: The flash points of these oils will not decrease significantly in service because of their resistance to thermal cracking at the operating temperatures for which they are recommended. They demonstrate specific heat and thermal conductivities that provide more rapid heat dissipation. Mobiltherm heat transfer oils have good heat transfer efficiency and their viscosities are such that they can be pumped readily at both start-up and operating temperatures. They are very thermally stable and are capable of an extremely long service life without deposit formation or viscosity increase. Mobiltherm heat transfer oils are formulated from highly refined base stocks that are resistant to thermal cracking and chemical oxidation. They are recommended for use in cold-oil sealed, indirect heating and cooling systems in all kinds of industrial processes. Mobiltherm heat transfer oils are high performance products intended for use in closed indirect heating installations.
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