Speaker: Mr. Art Dowell, Senior Technical Fellow, Hazard Analysis, Rohm and Haas Company
Subject: "Layers of Protection Analysis (LOPA)-Another Tool in the PSM Arsenal"
In order to determine if shutdown systems (Safety Instrumented Systems -- or SIS as they are called today) and other independent layers of protection provide sufficient risk reduction, several companies and industry groups developed and applied Layer of Protection Analysis (LOPA) during the 1990s.LOPA
is a simplified risk assessment tool that determines the risk reduction provided by such features as the basic process control, operator response, and relief devices to determine how much protection should be provided by safety instrumented systems.LOPA
offers a consistent and cost-effective approach for this analysis and it has the added benefit of resulting in enhanced system documentation.Drawing from the experience of several companies and organizations, this talk provides an overview of LOPA
and presents lessons learned from the application of LOPA
over the past decade.Examples are given to avoid potential pitfalls and traps.
...Art Dowell is a chemical engineering graduate of Rice University.He has 35 years experience at Rohm and Haas Company and is now Senior Technical Fellow, Hazard Analysis.He
has participated in writing three books for CCPS
(Center for Chemical Process Safety) on incident investigation, inherently safer processes, and layer of protection analysis (LOPA).He is an instructor for the AIChE layer of protection short course.Art is a member of ISA (the Instrumentation Systems and Automation Society), a Fellow of AIChE, and has received the Bill Doyle award from AIChE and the Albert Sperry Award from ISA.