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A compressor or air conditioner is known to be a machine that compresses gas into liquid. The liquid then decompresses and becomes a gas when it is heated. When an air conditioner is in use, the process of filling the window with coldness will keep going through this cycle. Compressors for these machines are needed specifically for supplying pressurized refrigerant vaporization in the heat exchanger, and they help with maintaining purer gases in them so they can continuously do their job. ASME section II has listed the classification of compressors in divisions 1, 2, 3, 4 and 5. Division I uses four categories of compressor for this purpose. The first one is the centrifugal compressor which is the most simple one. They are also known as high pressure compressors because they are used to compress gases into high pressures. Compressors are machines that can be used to force refrigerants into refrigeration systems at higher pressures than air conditioners can handle. The refrigerants would then be pumped by either a conventional or an electric motor (capable of operating at higher pressures) down to the condensing unit where they would be held under lower pressure before being vented out to the outside atmosphere. When the compressor is on, it will do its job of compressing the vapors into liquid by spinning either with a motor or by rotation. The high pressure side is then connected to a metering device that controls the amount of liquid flowing out to the condensing unit, which in turn controls how much gas-liquid mixture is entering the condenser. When this is done correctly, you can get optimum performance (runs longer between cycles, runs cooler) and lower operating costs (uses less electricity) for your air conditioning system. There are many different types of compressors used in refrigeration systems. For refrigeration and air conditioning systems, there is the scroll and rotary type. However, in most domestic and commercial systems there is a reciprocating or piston type. Compressors in ASME II consist of the following sections: A dictionary of terms is found in ASME Section VII.The most common types of compressor are: There are many different components that go into a compressor, such as: Operational standards for compressors include: The National Board Shop Association (NBS) provides information and training on compressed air systems and equipment. The association has developed a Compressed Air System Training Program that can be used by anyone interested in learning about safe operation of compressed air applications. On July 29, 2013, the U.S. Department of Labor Occupational Safety and Health Administration (OSHA) released an updated Safety & Health Topic Page titled "Compressed Air". This webpage provides standards, guidance documents, and other useful information on this topic. The American Society of Mechanical Engineers (ASME) is a group that can be consulted for information regarding compressors. cfa1e77820