The Hydraulic Institute (HI), under the approval of the American National Standards Institute (ANSI), is seeking qualified individuals in North America to participate in the review process for the draft of updated Standard ANSI/HI 4.1-4.6, Sealless Rotary Pumps for Nomenclature, Definitions, Application, Operation and Test.

This Standard covers the unique features of sealless rotary pumps and includes sections on types and nomenclature; definitions; design and applications; installation, operation, and maintenance; and test. Because of the variety of rotary pump configurations available and the broad range of applications, familiarization with Hydraulic Institute Standards ANSI/HI 3.1—3.5 Rotary Pumps for Nomenclature, Definitions, Application and Operation and ANSI/HI 3.6 Rotary Pump Tests is recommended.

Individuals and organizations directly and materially affected by this standard are asked to contact HI. These parties include pump users and specifiers, producers, standards developers, government agencies, and general interest groups. HI is currently assembling a canvass list of all parties interested in reviewing the draft. This list will be submitted to ANSI in order to meet its open canvass requirements.

To participate in the ANSI/HI canvass, contact Karen Anderson, Administrator, Technical Affairs, at or call (973) 267-9700 x23.

HI Pump Standards are reliable, 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. HI periodically introduces new Standards based on industry needs. The current edition of ANSI/HI Standards comprises over 1500 pages and 27 documents.

The Hydraulic Institute is the largest association of pump producers and suppliers to the pump industry in North America and is a global authority on pumps and pumping systems. Its mission is to serve as a forum for the exchange of industry information, while providing value-added services to member companies and pump users worldwide. For more information about the Hydraulic Institute, its member companies and Standards Partners, visit and