HI 9.6.4


Rotodynamic Pumps for Vibration Measurements and Allowable Values

Published by Publication Date Number of Pages
Hydraulic Institute(HI) 2022 47


HI 9.6.4 – Rotodynamic Pumps for Vibration Measurements and Allowable Values

This standard applies to the evaluation of vibration on rotodynamic pump applications absorbing more than 2 kilowatts (kW) (3 horsepower [hp]) and of the types as indicated in Figure It pertains to evaluation of vibration when the vibration measurements are made on stationary parts associated with bearings (bearing housing vibration).

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 vibration amplitude limits provided in this standard assume that the machinery is not in a resonant condition. Refer to HI 9.6.8 Rotodynamic Pumps – Guideline for Dynamics of Pumping Machinery for more information.

This standard applies to tests conducted within the rated speed ±10%. Tests conducted at speeds exceeding these limitations (such as variable-speed pumps or 50-cycle pumps tested with 60-cycle power for factory tests) shall be mutually agreed upon by the manufacturer and user due to the possibility of objectionable resonance effects.

This standard is also applicable to solids-handling pump types. A solids-handling pump is defined as a pump designed to ensure maximum freedom from clogging when handling liquids containing organic solids or stringy materials.

This standard is also applicable to slurry pump types. A slurry pump is defined as a pump suitable for pumping a mixture of abrasive solids with specific gravity greater than 1 and concentration by volume greater than 2% in a liquid carrier, usually water. For more information on slurry pump types, refer to the latest edition of HI 12.1–12.6 Rotodynamic Centrifugal Slurry Pumps for Nomenclature, Definitions, Applications, and Operation. If an ASME B73.1-type pump is used as a slurry pump, the acceptable vibration levels for slurry pumps as provided herein shall be used.

This standard is also applicable to submersible pump types. A submersible pump is defined as a close-coupled pump/motor unit designed to operate submerged in the pumped liquid. This definition includes submersible pumps operating in either a wet-pit or dry-pit environment.

The following types of pumping equipment and associated equipment are excluded from this standard:
– Wet pit cantilever belt-driven pumps with overhung motors
– Pumps purchased to be in compliance with API 610 and ISO 13709
– Reciprocating engine-driven pumps
– Drivers (except for guidance on vibration on vertical and horizontal motors, refer to Appendix C)
– Right-angle gear drives
– Maritime applications
– Solids-handling pumps with single-vane impellers [except for submersible pumps (OH8)]
– Vertically suspended submersible pumps (VS0)

For these pumping equipment types, refer to other industry standards, if available, or the pump manufacturer.

Torsional vibration is not dealt with in this standard.

Information for assessing shaft vibration measured on rotating shafts is excluded from the scope of this document.

The user is referred to the ISO 10816-7 standard for information on this topic.

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