December 2000

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HP Automation Safety: Periodic testing – theory versus reality

One of the fundamental concepts in new functional safety design standards is use of the safety life cycle. This is a design process where risks are evaluated, risk reduction targets are..

Goble, W., exida LLC

One of the fundamental concepts in new functional safety design standards is use of the safety life cycle. This is a design process where risks are evaluated, risk reduction targets are established and protection systems are designed to meet the risk. Risk is typically allocated among several different layers of protection, including a safety instrumented system (SIS). The SIS design is verified by calculating the risk reduction of the proposed design. A check is made to see that risk reduction design goals have been met. One of the key inputs to the calculation is the "periodic test interval". The shorter the interval,

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