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Various Types of Breathing Air Compressors

2016-01-18 15:31

A Breathing Air Compressor is a gas compressor that can provide breathing air directly to a surface-supplied diver, or fill diving cylinders with high-pressure air pure enough to be used as a breathing gas. A Low Pressure Breathing Air Compressorusually has a delivery pressure of up to 30 bar, which is regulated to suit the depth of the dive. A high pressure diving compressor has a delivery pressure which is usually over 150 bar, and is commonly between 200 and 300 bar. The pressure is limited by an overpressure valve which may be adjustable. Pet Air Compressor is generally three- or four-stage-reciprocating air compressors that are lubricated with a high-grade mineral or synthetic compressor oil free of toxic additives.
 
Oil-lubricated Dive Compressors must only use lubricants specified by the compressor's manufacturer. Special filters are used to clean the air of any residual oil and water. Smaller compressors are often splash lubricated - the oil is splashed around in the crankcase by the impact of the crankshaft and connecting rods - but larger compressors are likely to have a pressurized lubrication using an oil pump which supplies the oil to critical areas through pipes and passages in the castings. Most oil lubricated Diving Compressor will have a wet sump at the bottom of the crankcase, and require the oil level to be within limits indicated by a sight glass or dipstick for proper lubrication. The Breathing Air Compressor should also be level within the manufacturer's specification while operating.
 
These constraints ensure that the lubricant is in the right place for either the moving parts to contact it for splash lubrication, or for reliable suction to the oil pump. Failure to comply with these specifications can lead to damage to the Medium Pressure Compressor due to excessive friction and overheating, and contamination of the breathing air by toxic breakdown products of the lubricants. The compression process of the High Pressure Cng Compressor helps remove water from the gas, making it dry, which is good for reducing corrosion in diving cylinders and freezing of diving regulators, but contributes towards dehydration, a factor in decompression sickness, in divers who breathe the gas.
 
Oil, which must be used to lubricate the Dive Compressor's internal parts, can be particularly deadly if it enters the breathing gas and is inhaled as a mist. Petroleum-based oils cannot be absorbed and metabolized by the body and will coat the internal surfaces of the lungs, causing a condition known as lipoid pneumonia and leading to asphyxiation and death. For this reason, Low Pressure Breathing Air Compressor must be carefully designed and maintained to ensure that oil contamination of the breathing gas is within safe limits. Petroleum-based oils must never be used within the compressor. Instead, vegetable-based or specifically formulated synthetic oils are used, which can be safely absorbed and metabolized by the body in small quantities, should a malfunction occur.