Introduction to Risk Based Inspection

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Introduction to Risk Based Inspection
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Definitions

• Risk allows people to view potential hazards that
  simultaneously accounts for both the likelihood
  and consequences of an event.
• Risk Based Inspection (RBI) is a systematic tool
  that helps users make informed business decisions
  regarding inspection and maintenance spending.

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RBI Capabilities

• RBI has the capability to do the following
• Evaluate current inspection plans to determine
  priorities for inspections
• Evaluate future plans for decision making
• Evaluate changes to basic operations as they
  affect equipment integrity
• Identify critical contributors to risk that may
  otherwise be overlooked
• Establish economic optimum levels of inspection
  as weighed against risk reduction
• Incorporate Acceptable Risk levels

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Measuring Risk

• Risk is a combination of likelihood and
  consequence.
• One way to illustrate risk is to display the
  likelihood and consequence factors on an X-Y plot.

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Likelihood and Consequence X-Y Plot
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Iso Risk Lines
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Semi-Quantitative Risk Matrix
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RBI Analysis Comparison
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API 581 RBI Levels of Analysis

• The API RBI procedure has three levels of
  analysis
• Level I - screening tool that quickly highlights
  the high-risk equipment that users may wish to
  assess in greater detail.
• Level II - a step closer to being a quantitative
  analysis than Level I, and it is a scaled down
  approach of Level III. Provides most of the
  benefit of Level III analysis, but it requires
  less input than Level III.
• Level III - quantitative approach to RBI
  providing the most detailed analysis of the three
  levels.

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Why do we Need RBI?

• Most inspection codes/standards based on LOF, not
  COF
• Reduce risk of high consequence failures
• Improve the cost effectiveness of inspection and
  maintenance resources
• Provide a basis for shifting resources from lower
  to higher risk equipment
• Measure and understand the risks associated with
  current inspection programs
• Measure risk reduction as a result of inspection
  practices

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Benefits of an RBI Program

• The basic benefits of an RBI program are as
  follows
• It provides the capability to define and measure
  risk, creating a powerful tool for managing many
  of the important elements of a process plant.
• It allows management to review safety in an
  integrated, cost-effective manner.
• It systematically reduces the likelihood of
  failures by making better use of the inspection
  resources.
• AND
• It improves the reliability of plant equipment.