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Precautions for Changing Lubricating Oil
Preventing Health Risks from Lubricating Oils Many petroleum products are harmful to human health. If they come into contact with the skin and are not promptly washed off, they may cause mild dermatitis or bumps; in more severe cases, they can lead to rashes or skin tumors. If ingested or inhaled, they may result in gastrointestinal disorders or pneumonia in mild cases, and in serious cases, even cancer. Therefore, it is crucial to avoid contaminating food with petroleum, preventing its entry into the respiratory tract, and refraining from getting oil all over one’s body or spilling it on the ground. Such practices not only waste resources but also compromise personal hygiene. Animal studies have shown that refined mineral‑oil lubricants exhibit relatively low toxicity; however, the addition of additives increases their potential hazards, necessitating careful protective measures. Even if a new lubricant is non‑toxic, its degradation and contamination during use can significantly raise its risks. Thus, it is essential to avoid skin contact and, above all, to refrain from inhaling or ingesting the substance. If accidental exposure occurs, rinse the affected area thoroughly with clean water immediately. Disposal of Used Oil The lubricating oil that has been replaced is no longer suitable for reuse and must be disposed of as waste oil. Such waste oil should be handled properly to prevent environmental pollution.
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Basic Properties of Lubricating Oils and Fats
Lubricating oil is a technology-intensive product, consisting of a complex mixture of hydrocarbons, and its actual performance in service results from the combined effects of intricate physical and chemical processes. The fundamental properties of lubricating oil encompass general physicochemical characteristics, specialized physicochemical properties, and simulated bench‑test evaluations.
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2024
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Not changing the compressor oil for a long time?
The compressor’s lubrication and protection performance has deteriorated, shortening its service life.
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2024
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The True Service Life of Compressor Oil
The service life of screw compressor oil should be the minimum duration under normal operating conditions. Accurately determining the oil’s service interval is challenging, and manufacturers’ specifications vary. Generally, the recommended intervals are as follows: Group I mineral oils—2,000 hours; Group II mineral oils—up to 4,000 hours (later reduced to 2,000); Group III mineral oils—up to 6,000 hours (later reduced to 4,000); PAO synthetic oils—up to 8,000 hours (though some sources cite 6,000); and polyol ester oils—up to 12,000 hours (with some suggesting 8,000).
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2024
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The Necessity of Changing the Compressor Oil
During operation, compressor oil is subjected to heating, oxidation, high‑speed shear, dust contamination, and exposure to harmful gases. Oxygen reacts with the hydrocarbons in the lubricant, causing gradual oxidation: the oil darkens, its viscosity increases, and eventually oxidized products may become insoluble, forming a brown, viscous sludge that deposits in certain parts of the system. This sludge can readily clog control passages within components, exacerbating wear on ball bearings, valve spools, and other moving parts, thereby compromising normal system performance. Oxidation also leads to corrosion and acidification. The oxidation process begins slowly; as accumulated deposits and acid values rise and viscosity increases, it becomes necessary to change the oil once these thresholds are reached. If left unchecked, oxidation accelerates, viscosity continues to climb, and operating oil temperatures increase. As oxidation intensifies, the compressor oil’s viscosity exhibits a marked upward trend. When the oxidation rate shifts from linear to a power‑law curve, viscosity rises even more rapidly, potentially giving rise to undesirable outcomes.
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