The 2000 edition of the ANSI/HI standard on sealless centrifugal pumps has been updated by Hydraulic Institute (HI), Parsippany, N.J.

HI has publishedANSI/HI 5.1-5.6-2010 Sealless Rotodynamic Pumps for Nomenclature, Definitions, Application, Operation and Test. The revised standard covers sealless rotodynamic pumps driven by canned motors or through magnetic couplings with conventional motors.

The new standard contains a number of updates and enhancements, according to the organization. They include:
  • Pump part names and definitions.
  • Magnetic temperature limits.
  • Motor insulation temperature limits.
  • Magnetic drive pumps mounting specifications.
  • Monitoring device information.
In addition, the new standard provides users with expanded information in the test sections that cover types of tests, parameters, procedures and acceptance criteria.

“Sealless pumps are typically used when there is a need to contain toxic, dangerous or valuable liquids or when specific applications warrant their use. Application may be dictated by environmental, safety, noise or space concerns. Canned motor pumps and magnetic drive pumps both have a driven shaft that is completely contained within a pressurized boundary that contains the pumped liquid. Shaft loads are supported by product or external flush liquid-lubricated bearings. This configuration minimizes the chances for leakage because there is no shaft penetration of the pressure containment boundary.” says Gregg Romanyshyn, technical director of HI.

Under the leadership of Roger Turley, Flowserve Pump (Flow Solutions Group), and Peter Gaydon, Chempump, a Division of Teikoku USA, the committee incorporated current sealless pump technology in this standard. Sealless pump manufacturers who contributed to this standard include Chempump, Flow Solutions Group, ITT-Industrial Process and Iwaki America Inc.

In related news, HI also updated its standard,ANSI/HI 4.1-4.6–2010 Sealless, Magnetically Driven Rotary Pumps.This standard includes sections on:
  • Types and nomenclature.
  • Definitions.
  • Design and applications.
  • Installation, operation and maintenance.
  • Testing.
Magnetically driven pumps use permanent magnets to transmit torque through a containment shell that separates two sets of magnets. These pumps have a driven shaft that includes the pumping elements and is completely contained within the pressurized boundary surrounding the process liquid.

John Owen, IMO Pump-Colfax Corp., and Alan Wild, Moyno Inc., led the committee that developed the standard, which included representatives from Flowserve Pump Div., Leistritz Corp., Intelliquip LLC, IMO Pump, Milton Roy Americas, Moyno Inc., Roper Pump Co., Siemens Water Technologies and Weir Floway Inc.