The Hydraulic Institute, the pump industry's resource for pump education, has published a new American National Standard: Rotodynamic (Vertical) Pumps for Nomenclature and Definitions (ANSI/HI 2.1-2.2-2008). The standard applies to vertically suspended pumps, including single-casing (open-pit intake) submersible pumps and discharge through-column types (diffuser, volute and axial flow).

Also included are double casing (can or suction barrel intake - both diffuser and volute), and inline casing diffuser pumps. These pumps typically are driven by vertical electric motors or horizontal engines with right-angle gears. The standard also covers types, nomenclature and definitions for these pumps. Excluded from the scope of the document are:
  • Vertical inline pumps.
  • Horizontal centrifugal pumps mounted vertically.
  • vertical, overhung impeller, close-coupled and submersible single-stage pumps.
The organization's pump standards are widely accepted references for anyone involved in pumps, including users, consultants, contractors, construction firms, manufacturers of pumps, seals, motors, instrumentation, controls, and pump software developers and systems integrators. The standard, designated by Parsippany, N.J.-based Hydraulic Institute's product code A105, is available in hard copy or PDF format for $85. To order, visit or call (973) 267-9700, ext. 18.