June 2002

Columns

HP Automation Safety: Periodic inspection and test – requirements and benefits

As companies gain experience implementing the ISA 84.01 and IEC 61511 standards, several have gotten toward the end of the safety life cycle with real projects. The final phase of the s..

Goble, W., exida LLC

As companies gain experience implementing the ISA 84.01 and IEC 61511 standards, several have gotten toward the end of the safety life cycle with real projects. The final phase of the safety life cycle is called operation and maintenance. You may think, what operation? Often there is little operator interaction with the safety instrumented system (SIS). Remember that an SIS will take action (be dynamic) only when a dangerous condition exists. We certainly do not expect that very often. Given this situation, where the SIS just statically sits there doing nothing for perhaps years, how does one know if it will even work when

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