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Courtesy: Flexible Couplings their design selection and use by Michael M. Calistrat, Caroline Publishing, Houston,Tx.
The amount of unbalance still present in a coupling ready to be installed is defined as the Residual Unbalance. Two methods are currently used to measure residual unbalances:
- The unbalance moment method. The moment, in inch/ounces, is measured either at each component, or at an assembled coupling.
- The eccentricity method. The eccentricity, in micro inches, is the theoretical displacement of a rotating part, which would generate the same unbalance as the measured one. This method can be applied either at components, or at assembled couplings.
Whether a residual unbalance is acceptable or not for a specific application depends on three factors:
- Total coupling weight
- Maximum rotating speed
- Sensitivity to unbalanced forces of the machines on which couplings are installed.
Various manufacturers, users, and particularly users' associations have established classes and limits for coupling residual unbalance. Two of them are discussed below:
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