Grandfathering of safety instrumented systems (SISs) is no longer limited to the U.S. standard. ISA has accepted the 2nd edition of IEC 61511, “Functional Safety — Safety Instrumented Systems for the Process Industry Sector,” as the replacement for the current U.S. national standard, ANSI/ISA 84.00.01-2004. Unlike the previous edition, the latest U.S. and international versions don’t differ at all. This is good news for the process industry sector, which sources so many products and services internationally.However, many U.S. processors may worry about what happened to the previous edition’s “grandfather clause” or ANSI/ISA 84.00.01-1 clause 1y:“For…Full Story
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