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Why are some compressors rated in Free Air Delivered and some in Displacement?

April 26, 2017air compressors delivered displacement Free rated

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Why are some compressors rated in Free Air Delivered and some in Displacement?

2 Answers

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In simple terms displacement is the theoretical output figure without taking into account heat expansion, friction losses and general inefficiencies. Free air delivered is the actual amount of air available for use at the output of the compressor. For a fuller explanation see – http://www.britishcompressedairsociety.co.uk/downloads/terminology.

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In simple terms displacement is the theoretical output figure without taking into account heat expansion, friction losses and general inefficiencies. Free air delivered is the actual amount of air available for use at the output of the compressor.