The Hydraulic Institute (HI,, under the approval of the American National Standards Institute (ANSI,, is seeking qualified individuals to participate in the review process for the draft of updated standard 9.6.4, “Rotodynamic Pumps for Vibration Measurements and Allowable Values.”

This standard pertains to evaluation of vibration when the vibration measurements are made on nonrotating parts (bearing housing) of rotodynamic pumps. It provides specific maximum allowable vibration values measured on bearing housings of rotodynamic pumps in field and factory test environments.

This standard applies to the evaluation of vibration on rotodynamic pump applications absorbing more than 2 kW (3 hp). See the figure, Pump Types within Scope of Standard 9.6.4-draft, available at

The general evaluation criteria are included for acceptance tests in field environments or at the manufacturer’s test facility, as appropriate and as defined in the standard.

The following applications, types of pumping equipment, and associated equipment are excluded from this standard:
• Submersible pumps (refer to ANSI/HI 11.6)
• Submersible vertical turbine pumps
• Wet pit cantilever belt-driven pump with overhung motors
• API 610 or ISO 13709 pumps
• Reciprocating engine-driven pumps
• Separately mounted drivers (i.e., vertical motors on separate floors)
• Right-angle gear drives
• Maritime applications
To participate in the ANSI/HI canvass, contact Karen Anderson, Technical Affairs Administrator, at or call (973) 267-9700 x23. HI periodically introduces new standards based on industry needs. The current Edition of ANSI/HI Standards comprises over 1,500 pages and 27 documents.