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Questions and Answers
What are the two main classifications of crude oils for lubricating oil base stocks and their respective characteristics?
Paraffin base with high lubricating oil content, high pour point, and high viscosity index; Asphalt base with low lubricating oil content, low pour point, and low viscosity index.
What is compound oil and what is the typical percentage of non-mineral oil added to produce it?
Compound oil is a blend of mineral (or mineral blend) oil with 5% to 25% of non-mineral animal or vegetable oil.
What are the properties of oils compounded with fatty animal oil and mineral oil for lubricating in the presence of water or steam?
They tend to form a stable emulsion, adhere strongly to metal surfaces, have high load carrying capacity, and if sulphurised, have extreme pressure (EP) property.
What is the concern related to the hydrolysis of fatty oils and the British Standards recommendation for lubricating steam machinery?
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How are lubricating oil base stocks obtained, and what treatments are applied to refine them?
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