December 2004

Plant Safety and Environment

Safeguarding system interactions: a case study

A custom made PHA methodology can help find hidden problems in your facility

Mani, G., BP Canada Energy Co.

All critical process parameters in the hydrocarbon processing industry (HPI) are protected when a unit approaches hazardous operating conditions. Usually this is done with a safety instrumented system (SIS). Trip systems can stand alone, where each system functions independently, or there can be a supervisory safety system, where all SISs are linked to a central processing unit (CPU). The standalone trip system for each supervisory SIS module is designed to protect a particular piece of equipment from hazardous conditions. But it may initiate a chain reaction where an unexpected hazardous condition can be created inadvertently in another part of the process. A chain reaction is especially

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