Ten Fingers and Ten Toes: Applying Machinery Safety Principles in a Process Plant
When performing risk assessments on process equipment, are you reviewing machinery as well?
To use an instrument or component that has not been designed in accordance with IEC 61508, the "proven in use" concept can be applied given that a system for gathering reliability data and ways to assess the recorded data to determine the safety integrity of the system, as well as recorded historical evidence of device hours in use are present.