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air vessel

Also called: air chamber
Standards
a vessel that utilizes the compressibility of contained air to promote a more uniform flow of water
Source - AS/NZS 3500.0:2003: Plumbing and drainage
HB50
vessel connected to a pressurized water system which utilizes the compressibility of contained air to promote a more uniform flow of water by cushioning pressure effects caused by sudden changes of water flows, such as shock due to water hammer
In New Zealand an air vessel at the highest point of a pipeline is called an ‘air bottle’.