In an effort to improve the accuracy of pump standards’ nomenclature, the Hydraulic Institute published new national standards combining its 1-series and 2-series standards into a single 14-series standards. Historically, HI standards have been divided into “1-series” standards — covering centrifugal pumps — and “2-series” standards — covering vertical pumps.

In the 2000s, HI’s technical leadership reviewed its standards and nomenclature and determined the content in the 1-series and 2-series documents could be improved by such revisions. This resulted in an effort to combine each of the 1-series and 2-series standards into a single 14-series standard, which includes:

  • ANSI/HI 14.1 -14.2 Rotodynamic Pumps For Nomenclature and Definitions
  • ANSI/HI 14.3 Rotodynamic Pumps For Design and Application
  • ANSI/HI 14.4 Rotodynamic Pumps For Installation, Operation and Maintenance
  • ANSI/HI 14.6 Rotodynamic Pumps For Hydraulic Performance Acceptance Tests

As noted in the names of the standards, the old centrifugal and vertical pumps are grouped under the name rotodynamic, which is an improvement in the accuracy of the nomenclature describing these types of pumps.