17. Summary of Risk-Based Inspection Pitfalls Flashcards
- Summary of Risk-Based Inspection Pitfalls
- 1 General
Highlights
List of potential pitfalls covered in previous sections of this RP can be used as checklist to review the RBI work process or to audit the effectiveness of an RBI program.
- Summary of Risk-Based Inspection Pitfalls
- 2 Planning
Pitfalls of planning
a) Not defining clear objectives and goals for the RBI process.
b) Not screening multi-units to know where to use RBI first.
c) Not defining the physical and operating boundaries adequately.
d) Not defining the operating time period for the risk assessment.
e) Not adequately defining the time required and resources needed for the project.
f) Not having full management support for the necessary RBI resources.
g) Unrealistic expectations for the results of RBI.
- Summary of Risk-Based Inspection Pitfalls
- 3 Data and Information Collection
Pitfalls of Data and Information Collection
a) Not understanding all the data needs.
b) Not identifying all the appropriate sources of data/information.
c) Failing to collect all the data/information needed.
d) Dealing with poor quality data.
e) Not verifying the data to ensure quality.
- Summary of Risk-Based Inspection Pitfalls
- 4 Damage Mechanisms and Failure Modes
Pitfalls of Damage Mechanisms and Failure Modes
a) Not identifying all the probable and credible damage mechanism and failure modes.
b) Incorrectly ruling out damage mechanisms thought to be inactive.
c) Operating outside the established IOWs or not properly identifying the correct IOW limits.
d) Not understanding the impact of damage mechanisms on pressure equipment resulting from operating outside the IOWs.
e) Using software or methodologies that do not cover all active damage mechanisms.
f) Inadequate definition of failure modes associated with each damage mechanism.
g) Inadequate definition of damage rates for each damage mechanism.
- Summary of Risk-Based Inspection Pitfalls
- 5 Assessing POF
Pitfalls of Assessing POF
a) Not addressing all probably and credible damage mechanisms when determining POF.
b) Not understanding the interaction of multiple damage mechanisms in each piece of equipment.
c) Not defining the specific POF units of measure to be used.
d) Not using the most appropriate POF methodology for the situation.
e) Using generic POFs instead of equipment specific POFs.
f) Inadequate assessment of past effectiveness of inspections.
g) Inadequate assessment of susceptibility to each damage mechanism.
h) Inadequate assessment of damage rates.
- Summary of Risk-Based Inspection Pitfalls
- 6 Assessing COF
Pitfalls of Assessing POF
a) Not identifying all the appropriate incidents/events/outcomes of a failure.
b) Not identifying all the appropriate consequences of each incident.
c) Not selecting the appropriate consequence assessment methodology.
d) Not associating the right consequence with each failure mode.
e) Not using the right units of measure for COF.
f) Not knowing the right volume of fluid that can potentially be released.
g) Not understanding the most likely release rate.
h) Not understanding the likely form of discharge (i.e. gas, liquid, vapor).
i) Not accounting for likely dispersion.
j) Not adequately dealing with the all the potential hazards i.e. flammable, toxic, other effects.
k) Inadequate knowledge of the effectiveness of hazard detection and mitigation systems installed.
l) Not considering all potential impacts (i.e. safety, environmental, business, and repair).
m) Not appreciating that consequence categories are typically relative measures, not absolute.
n) Not adequately accounting for the full series of events that may lead to the full consequence.
o) Not dealing with potential effects on other process units or facilities (i.e. “knock-on” effects).
- Summary of Risk-Based Inspection Pitfalls
- 7 Risk Determination, Assessment, and Management
Pitfalls of Risk Determination, Assessment, and Management
a) Using “black box” software without understanding all the calculations and algorithms.
b) Failure to identify the specific consequence for each probable failure from each damage mechanism.
c) Using inadequate assumptions in place of nonexisting or poor quality data/information.
d) Using overestimated or under-estimated POFs and/or COFs in the risk determination.
e) Not adequately handling uncertainties.
f) Inadequate risk presentation or communication to stakeholders.
g) Not having risk acceptance criteria/thresholds.
h) Inappropriate or untimely risk management activities.
i) Not understanding the real risk drivers (i.e. COF, POF, or both).
- Summary of Risk-Based Inspection Pitfalls
- 8 Risk Management with Inspection Activities
Pitfalls of Risk Management with Inspection Activities
a) Inadequate inspection planning based on the risk assessment results.
b) Lack of inspection plans for each probable/credible damage mechanism.
c) Lack of an objective, structured inspection planning process for the risk results.
d) Not appreciating when inspection activities have little or no value in risk mitigation.
e) Not choosing the most appropriate inspection technique for risk reduction.
f) Not choosing the right combination of inspection frequencies, techniques, and practices.
g) Lack of appropriate or timely mitigation based on the inspection findings.
h) Inadequate planning for the resources necessary to implement the RBI plans.
- Summary of Risk-Based Inspection Pitfalls
- 9 Other Risk Management Activities
Pitfalls of Other Risk Management Activities
a) Not appreciating the need for and implementing risk management activities other than inspection.
b) Not communicating with other stakeholders about potential for other risk management activities.
- Summary of Risk-Based Inspection Pitfalls
- 10 Reassessment and Updating RBI Assessment
Pitfalls of Reassessment and Updating RBI Assessment
a) Not appreciating the dynamic aspects of risks (i.e. changing with time).
b) Not knowing when to do RBI reassessments and updates.
c) Not having a good connection between MOC and RBI reassessments.
d) Not doing reassessments on a timely basis.
e) Not identifying impact of operational changes that may affect the IOWs.
- Summary of Risk-Based Inspection Pitfalls
- 11 Roles, Responsibilities, Training, and Qualifications for RBI Team Members
Pitfalls of Roles, Responsibilities, Training, and Qualifications for RBI Team Members
a) Not having specific designated roles for each RBI team member.
b) Not having all the right RBI team members.
c) Having team members with inadequate skills, experience, or knowledge.
d) Inadequate training on the RBI work process.
e) Not having an effective team leader.
f) Not having a skilled risk analyst.
g) Handing over the RBI project to consultants without adequate integration and overview.
- Summary of Risk-Based Inspection Pitfalls
- 12 RBI Documentation and Recordkeeping
Pitfalls of Documentation and Recordkeeping
a) Not appreciating the value/need for full RBI documentation.
b) Not understanding what needs to be documented.
c) Not documenting all assumption and the basis for those assumptions made during the process.
