Balancing to a standard

Industrial balancing and vibration analysis on rotating machinery enables the early detection of faults before breakdown, and assists commercial and industrial facilities reduce their maintenance costs and unscheduled downtime. Industrial balancing is the procedure where the mass distribution of a product, be it a pump, roller, impeller or the like, is accurately measured and suitably adjusted.

Whether industrial balancing a pump impeller, fan or drive shaft; small or large, the process should be completed to a recognised international standard. This ensures balance quality and data consistency to ensure the item is correctly balanced within specified tolerances. The International Standards Organization (ISO) publishes several standards which are the global benchmark for industrial balancing.
The main one of these standards is ISO 1940-1:2003 Mechanical vibration — Balance quality requirements for rotors in a constant (rigid) state. Part 1: Specification and verification of balance tolerances. This standard gives specifications for rotors in a constant (rigid) state according to their machinery type and maximum service speed. These recommendations are based on worldwide experience.
This standard also specifies Balance Tolerances, the necessary number of correction planes, and methods for verifying the residual unbalance. The standard is also intended to facilitate the relationship between the manufacturer and user of rotating machines, by stating acceptance criteria for the verification of residual unbalance.
The ISO standards contain detailed methods of calculating different static and couple unbalance tolerances that are dependent on the ratio of the part’s diameter to its length. The ISO standard also specifies a Balance Quality Grade. This is a term used to define the limits of residual unbalance. It represents the product of the eccentricity (in millimetres) times the operating frequency (in Hertz). The standard has issued guidelines with regard to a number of different kinds of devices. A balance quality grade of G6.3 is appropriate to most pump impellers. A tighter tolerance of G2.5 may be specified in some cases.
Precision Balancing has been offering in house and on site dynamic balancing and vibration analysis services since 1989 and have the equipment, skills and experience to satisfy your industrial balancing requirements. Precision Balancing strictly adhere to the requirements of the relevant ISO standard, and all jobs are tracked through our system and are issued with a certificate of compliance.


For more information on industrial balancing services and standards visit www.precisionbalancing.com.au

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