October 2000

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HP Automation Safety: Safety-certified equipment, so what?

I had a hallway discussion at a recent safety standards committee meeting about how to implement the safety life cycle. One of the fundamental concepts in the safety life cycle is risk-..

Goble, W., exida LLC

I had a hallway discussion at a recent safety standards committee meeting about how to implement the safety life cycle. One of the fundamental concepts in the safety life cycle is risk-based design. Process risk is evaluated and risk reduction targets (safety integrity levels, SILs) are selected for each safety loop. The resulting safety design is verified against the SIL target using an analysis of hardware failure rates, failure modes and diagnostic coverage. This system provides verification in a closed-loop method that control engineers can certainly understand. The SIL verification process using failure rate

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