ANSI HI 9.1-9.5:2000 pdf free download.Pumps - General Guidelines. 9.2 Definitions 9.2.1 Hardware terms 9.2.1.1 accumulator: A mechanical device which stores pressure energy of any noncompressible liquid held under pressure by an external source against some dynamic force. 9.2.1.2 alleviator: A device, usually a pressure vessel with a liquid-gas interface used to absorb or reduce the hydraulic “shock" or "water...
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