View Contents. This Practice provides guidance for the application of machinery protection instrumentation on rotating equipment in accordance with the applicable API Recommended Practices (RP). Considerations are also given to condition monitoring for enhanced performance and predictive maintenance. This Practice can be used as a guide for the following: a. Preparing bid specifications for rotating equipment machinery protection and monitoring instrumentation b. Retrofitting monitoring instrumentation on existing installations c. Identifying areas of responsibility for design, installation, and/or maintenance of rotating equipment-monitoring instrumentation d. Preparing bid specifications for a Continuous Machinery Monitoring System (CMMS) This Practice describes the following: a. When continuous on-line monitoring of rotating equipment should be provided b. Types of monitoring that could be provided and where they are applied c. Installation considerations specific to type of monitoring equipment d. General calibration and functional checkout considerations e. Documentation recommendations Rotating equipment covered includes centrifugal compressors, centrifugal pumps, gears, steam turbines, gas turbines, electric motors and generators, and other shaft driven equipment.