Smooth Running Pumps have been an Industry issue since 1988. This caused many nuclear plants to obtain a Relief Request to use alternative requirements than those specified in the tables in subsections ISTB or ISTF of the ASME OM Code. Code Case OMN-22, Smooth Running Pumps, was approved in January 2017 for pumps with very low reference value vibration levels. This Code Case specifies the alternative requirements that may be used in lieu of the applicable Code subsections.

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