Industrial plants may contain thousands of piping circuits, vessels, tanks and other inspectable assets.
Treating every item as equally important is neither practical nor necessarily effective.
Risk-Based Inspection, or RBI, helps plants focus inspection effort where failure could matter most.
Risk Combines Probability and Consequence
The basic concept is straightforward:
Risk = likelihood of failure × consequence of failure
Two pieces of equipment may have similar degradation rates but very different risk.
A small utility line and a vessel containing hazardous material do not create the same consequence if they fail.
Probability Depends on Condition and Damage Mechanisms
The likelihood of failure may be influenced by:
Understanding likely degradation mechanisms is therefore essential.
Consequence Looks Beyond Equipment Damage
Failure consequences may include:
Higher-consequence assets generally justify greater inspection attention.
Inspection Resources Can Then Be Prioritised
RBI helps determine where inspection effort provides the most value.
Higher-risk equipment may require:
Lower-risk assets may justify longer intervals where engineering assessment supports that decision.
RBI Does Not Eliminate Inspection
Risk-Based Inspection is sometimes misunderstood as a way to inspect less.
That is not the objective.
The objective is to inspect more intelligently.
Some assets may receive less frequent inspection, while others may receive significantly more attention.
Inspection Results Feed Back Into the Assessment
RBI is not a one-time classification.
New inspection findings, process changes or operating events can alter the risk picture.
The assessment should therefore be updated when meaningful new information becomes available.
Risk Helps Focus Engineering Attention
RBI asks:
Where could degradation realistically occur, how likely is failure, and what would happen if it did?
That allows plants to direct inspection resources toward the equipment where integrity matters most.
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