scope:

The Fifth Edition of the Performance Standard for Liquid Ring Vacuum Pumps and Compressors presents industry standards and factory test methods. Definitions and nomenclature for liquid ring vacuum pumps and compressors are included along with design specifications, operating variables, correction factors, and figures that describe single and/or two-stage flat port plates, conical ports, and test set-ups for vacuum pump performance. Like all HEI standards, there is an appendix for conversion of English to SI units.