April 2010

Safety/Loss Prevention

What every manager should know about layers of protection analysis

New methods 'quantify' the frequency of risky events in a facility

G. C. SHAH, Mustang Engineers, LP, Houston, Texas      Comments? Write:editorial@HydrocarbonProcessing.com After a hazard and operability (HAZOP) study has identified risks in a project, the Layers Of Protection Analysis/ Safety Integrity Level (LOPA/SIL) analyses are conducted to quantify risk. However, some managers choose not to commit funding for LOPA/SIL analyses. Instead, they prefer to mitigate risks by installing additional controls and provide more operator training and testing. These well-intentioned decisions are based on some the following excuses:• Tight project schedules. In very rare cases, a manager has adequate time and resources t

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