March 2006

Special Report: Instruments and Networks

Performing safety life cycle analysis helps mitigate process hazards

Using integrity levels and instrumented functions is necessary for safe process design

van Beurden, I., exida LLC

Acceptance throughout the industry of functional safety standards IEC 61508 and the process industry derivative IEC 61511 is dramatically increasing.1,2 The IEC 61511 standard replaced, with additional clauses like the grandfather clause, the ANSI/ISA 84.01. This new functional safety standard is called ANSI/ISA 84.00.01-2004.3 Large multinational companies are not the only ones incorporating functional safety. It is becoming more common to find smaller, national companies using it as well. The IEC 61508 standard was created to be an umbrella standard (Fig. 1), where industry-specific standards could be derived, as has already been done in the process and nuclear industries. Machinery indu

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