Product Overview
Compressor oil is composed of a mixture of high quality lubricating base fluids and high-performance additives that offers exceptional lubrication in compressors in various types of service. Compressor oil is designed to lubricate and seal the compression components as well as lubricate the bearings inside the compressor. In addition, the fluid helps to reduce the buildup of carbonaceous deposits in the compressor valves and downstream piping, thus increasing the compressor life. Compressor fluids are typically rust and oxidation inhibited antiwear products blended to standard ISO viscosity grades. They are often customized for the intended service (air, gas, or refrigeration) as well as the type of compressor to be lubricated (rotary screw, reciprocating, axial, etc.).
Compressors are used in a multitude of applications. The most common gas that is compressed is air, for use in everything from heavy industry to the home workshop. Rotary screw compressors are the most common type used for air compression. The next most commonly compressed gas is natural gas (methane), in very large reciprocating compressors found mostly in compressor stations along gas transmission pipelines. Another common type of compressor application is the compression of refrigerant gases, in places including home and automotive air conditioners, home refrigerators and freezers, and chillers and freezers in the food and beverage industry.
Properties of Compressor Oil
Viscosity
As with most lubricants, viscosity is the single most important property of a compressor oil. In general, rotary compressors require lower viscosity grade lubricants, while reciprocating compressors need higher viscosity products.
Chemical Stability
Compressor lubricants are designed to be inert and resistant to the gas being compressed. In the case of air compressor lubricants, this means that the lubricant must have excellent oxidation resistance. For that reason, synthetic fluids are often used as the basis of air compressor lubricants. Fluids for use in natural gas compressors need to resist dilution by the gas. Both mineral oil and synthetic hydrocarbon (polyalphaolefin or PAO) fluids are susceptible to gas dilution. Fluids based on polyalkylene glycol (PAG) fluids are preferred for compressors handling natural gas or other hydrocarbon gases. In refrigeration compressors, the type of refrigerant must be known. The compressor lubricant must be miscible with the refrigerant to a certain extent to provide the required lubrication of the compressor. In addition, the lubricant must be chemically compatible with the refrigerant, and must have a pour point lower than the minimum temperature to which it will be exposed in service. With any compressor system, it is important to follow the manufacturer's lubricant recommendation.
Dielectric Strength
Since the compressors used in air conditioning, refrigerators, and freezers are completely sealed systems and the electric motors driving them are inside the enclosure, the oils used in them must have good dielectric strength and contain virtually no water.
Advantages of Compressor Oil
The main purpose of compressor oil is to lubricate the moving parts and seal the compression portion of a compressor. This can reduce maintenance requirements and improve the life of a compressor. The above properties of the compressor oil help it to achieve its purpose as discussed below
Other Applications for Compressor Oil
Precautions for Using Compressor Oils