Regarding lubricating oil for reciprocating compressors
Thread Content
Under GB12691-1990, there are two types: L-DAA and L-DAB. I’m not quite clear about the differences between these two. Could experts please help explain when to use the former and when the latter is necessary? Thank you all.
There are two types: L-DAA150 and L-DAB150. I’m not quite sure about the difference between these two
Generally, L-DAA oil is used in low-load compressors, while L-DAB oil is suitable for medium-load air compressors
Air compressor oils are divided into three types: light-duty L-DAA, medium-duty L-DAB, and heavy-duty L-DAC. The viscosity grades for each type include 32, 46, 68, 100, and 150. Among them, DAA and DAB are of the mineral oil type, while DAC is of the synthetic oil type. Selection of lubricating oil for reciprocating compressors: 1. Mineral oils, grades 100/150; 2. Synthetic lubricating oils, grades 68/100. The base oils used in synthetic compressor oils include synthetic hydrocarbons (poly-alpha-olefins), organic esters (diesters), polyalkylene glycols, fluorosilicone oils, and phosphate esters. Compared to mineral oil-based oils, they offer advantages such as better high-temperature stability, reduced tendency to form carbon deposits at high temperatures, a wider operating temperature range, a lower pour point, lower volatility, and a longer service life. However, due to their high cost, they are used only in compressors that operate under harsh conditions where mineral oil-based oils are not suitable.
Is the oil mentioned upstairs used in the cylinders or in the bearings? :)
General mineral-based compressor oils: Used in cylinders, with grades 100 or 150 being commonly used. The viscosity is too high, making it difficult to start the machine. It is used in bearings, with grade 150 being commonly used. The viscosity is too high, making it difficult to start the machine. It is usually simplified to No. 150. In cold regions, it should be noted that the low temperatures cause the lubricant to become very viscous, making it difficult to start the machinery; therefore, a heating device is generally necessary. Abroad, fully synthetic lubricants are often recommended; grades 68 or 100 are sufficient, and they are also very energy-efficient. High flash point, high saturated vapor pressure, very low pour point, very high viscosity index, etc. 1. Volatility of lubricating oil. 2. Good antioxidant properties. 3. Good low-temperature starting performance. 4. Long oil change interval. This post was last edited by xlxderun on 2009-2-18 20:11]
Thank you very much, brother upstairs. You’ve really helped me a lot.
This is quite basic: one is light load, another is medium load, and DAC represents heavy load.