12. Risk Management with Inspection Activities Flashcards
- Risk Management with Inspection Activities
- 1 Managing Risk by Reducing Uncertainty Through Inspection
- Impending failure of pressure equipment is not avoided by inspection activities unless
the inspection precipitates risk mitigation activities that change the POF.
- Risk Management with Inspection Activities
- 1 Managing Risk by Reducing Uncertainty Through Inspection
- The reduction in uncertainty and increase in predictability through inspection translates directly to a better
estimate of the probability of a failure and therefore a reduction in the calculated risk.
- Risk Management with Inspection Activities
- 1 Managing Risk by Reducing Uncertainty Through Inspection
- Some damage mechanisms are very difficult or impossible to monitor with just inspection activities (e.g. metallurgical deterioration that may result in brittle fracture, many forms of stress corrosion cracking, and even fatigue). In this case the
IOW and MOC complement the monitoring.
- Risk Management with Inspection Activities
- 1 Managing Risk by Reducing Uncertainty Through Inspection
- The quality of the inspection data and the analysis or interpretation will greatly affect
the level of risk mitigation.
- Risk Management with Inspection Activities
- 2 Identifying Risk Management Opportunities from RBI Results
- RBI will also identify whether consequence or POF or both is
driving risk.
- Risk Management with Inspection Activities
- 2 Identifying Risk Management Opportunities from RBI Results
- In the situations where risk is being driven by POF, there is usually potential for risk management through
inspection.
- Risk Management with Inspection Activities
- 2 Identifying Risk Management Opportunities from RBI Results
- Once an RBI assessment has been completed, the items with unacceptable risk to the owner-user shall be assessed for
potential risk management through inspection plans or other risk management strategies. Higher risk items should also be assessed for potential risk management actions.
- Risk Management with Inspection Activities
- 2 Identifying Risk Management Opportunities from RBI Results
- Depending on factors such as the remaining life of the equipment and type of damage mechanism, risk management through inspection may
have little or no effect.
- Risk Management with Inspection Activities
- 2 Identifying Risk Management Opportunities from RBI Results
- The most practical and cost-effective risk mitigation strategy can then be
developed for each item.
- Risk Management with Inspection Activities
- 2 Identifying Risk Management Opportunities from RBI Results
- Usually, inspection provides a major part of the
overall risk management strategy, but not always
- Risk Management with Inspection Activities
- 2 Identifying Risk Management Opportunities from RBI Results
Whether inspections will be effective or not will depend on
a) equipment
b) active and credible
c) rate of deterioration or
d) inspection methods, coverage, and
a) type;
b) damage mechanism(s);
c) susceptibility;
d) frequency;
- Risk Management with Inspection Activities
- 2 Identifying Risk Management Opportunities from RBI Results
Whether inspections will be effective or not will depend on
e) accessibility to expected
f) shutdown
g) amount of achievable reduction in
e) damage areas;
f) requirements;
g) POF (i.e. a reduction in POF of a low POF item is usually difficult to achieve through inspection).
- Risk Management with Inspection Activities
- 2 Identifying Risk Management Opportunities from RBI Results
Depending on factors such as the remaining life of the equipment and type of damage mechanism, risk management through inspection may have little or no effect. Examples of such cases are as follows:
a) corrosion rates well-established with
b) instantaneous failures related to operating conditions such
c) inspection technology that is not sufficient to detect or quantify
a) equipment nearing end of life;
b) as brittle fracture;
c) deterioration adequately;
- Risk Management with Inspection Activities
- 2 Identifying Risk Management Opportunities from RBI Results
Depending on factors such as the remaining life of the equipment and type of damage mechanism, risk management through inspection may have little or no effect. Examples of such cases are as follows:
d) too short a timeframe from the onset of deterioration to final failure for
e) event-driven
In cases such as these, an alternative form of mitigation may
d) periodic inspections to be effective (e.g.high-cycle fatigue cracking);
e) failures (circumstances that cannot be predicted).
be required.
- Risk Management with Inspection Activities
- 3 Establishing an Inspection Strategy Based on Risk Assessment
- The results of an RBI assessment are normally used as the basis for the development of
an overall inspection strategy for the group of items included.