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A

A Absolute Pressure: This is a pressure measured from a base of absolute zero. We breathe air at a pressure of approximately 14.7 pounds per square inch absolute (psia). We don’t notice this pressure because it is always around us – and its called atmospheric pressure. However, if we look at an unused pressure gauge …

B-C

B Bar: A measurement of pressure, 100kPa = 1 bar. This corresponds very closely to 1 atmosphere and the two are often confused. 1 bar = 14.504 psi. 1 atmosphere = 14.7 psi. Bar(a) also bara: The pressure of a system or device measured from absolute zero. Bar(g) also barg: The pressure of a system …

D Deliquescent dryers: A dryer which employs a chemical in the form of a tablet to absorb moisture. The chemical degrades into a liquid which is drained off periodically. Similarly the dryer has to be ‘topped up’ with new tablets to continue working. See dryers. Desiccant dryers: Also called pressure swing dryers, these use a …

H Halogen: The collective term used to describe the five non-metallic elements… * Astatine * Bromine * Chlorine * Fluorine * Iodine Halogenated Hydrocarbons A group of chemicals, including some refrigerant gases. Many arise as unwanted by-products such as from the manufacture of pesticides and the incineration of polychlorinated biphenyl (PCB). Some are exceptionally hazardous. …

M M3/min ANR (also M3/hr ANR): Volume flow rate measured in cubic metres per minute (or per hour) related back to ANR conditions. Mayonnaise: The oily condensate discharged by lubricated air compressors. The name is derived from the appearance of the condensate. Under normal conditions oily condensate should just be cloudy, like a small amount …

P

P&ID – Piping and Instrument Diagram: A schematic diagram showing the position of valves, switches, pumps etc in a flow or process. Package Power: The total power absorbed by a compressor, including the power absorbed by all pumps, fans, coolers and the like. This is the figure to look for when buying a compressor. Particulate …

R

Receiver: The vessel used to contain compressed air, referred to as a ‘tank’ in the USA. As a general rule of thumb most systems need a minimum of a ‘one minute receiver’. Although wholly inaccurate, the following will provide the basis of most systems. 700 cfm compressor at 7 barg. 700/7 = 100 cubic ft …

S

Safety of Pressure Systems Regulations: The Pressure Systems and Transportable Gas Containers Regulations 1989 has now been replaced. See Pressure Systems Safety Regulations 2000. Separator: The term used to describe the filter inside an oil injected screw compressor which removes the hot oil from the hot compressed air. The separator element is a consumable component …

T

Tank: An Americanism meaning air receiver. Thermal Load: Compressor fires are not too common, however when a flammable substance burns in air, the nitrogen content is inert. Nitrogen makes up a large part of the overall content of air and will be heated up as a result of the combustion. The heat absorbed by the …

U Upper Explosive Limit (UEL): Also called the Upper Flammable Limit. Flammable vapour or gas will only burn within a limited concentration range in air. If the mixture is too rich to burn, it is above the Upper Explosive Limit. Also see Lower Explosive Limit (LEL). Upper Flammable Limit. See above) V Vacuum (vacuum pump): …