From ThomasNet: The Hydraulic Institute (HI) has updated the 2004 edition of the ANSI/HI standard on air-operated pumps and published Air-Operated Pumps ANSI/HI 10.1-10.5-2010. The updated standard is for air-operated pumps and includes positive displacement reciprocating pumps used for general liquid transfer. These pumps are usually driven by means of a compressed gas (usually air) from an outside source.
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Hydraulic Institute Updates Air-Operated Pumps Standard and Air-Operated Pumps Test Standard