This guideline is intended to give the pump user a tool for condition monitoring of rotary positive displacement pumps, but does not directly address process management systems. It is the user?s responsibility to identify the need for implementing pump condition monitoring practices. The user is also responsible for identifying those parameters they wish to monitor. This document does not require any monitoring be done, but will provide information relevant to making such decisions, and provides suggestions for carrying out the monitoring process. This guideline discusses some of the indicators that can be monitored or reviewed on rotary pumps to predict and identify pump failure modes. Common means of measuring those indicators have been defined. Control limits have been recommended, where appropriate, for those indicators whose limits are not defined in other Hydraulic Institute Standards.