SIS-TECH (2005) Can You Safely Grandfather Your SIS
Process safety is a major concern to anyone who works in a process facility. An estimated 25,000 facilities covered by the Occupational Safety and Health Administration (OSHA) Process Safety Management of Highly Hazardous Chemicals regulation will most likely have safety
Interest in performing rigorous hazard and risk analysis and applying certified safety instrumented systems has increased considerably since publication of the IEC 61508 safety standard and, more recently, the IEC 61511 and ANSI/ISA-84.00.01 (for brevity ISA-84.01-2004) standards for process safety.
It is estimated that about 66% of the Programmable Electronic Systems (PES) running in the process industry were installed before the publication of today’s commonly used safety standards (IEC 61508 and IEC 61511/ISA 84) Some of those safety systems,