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The basis for a qualitative probability of failure analysis is:



Regardless of whether a more qualitative or quantitative analysis is used, the POF is determined by two main considerations:



Combinations of process conditions and _____________________ for each equipment item should be evaluated to identify active and credible damage mechanisms:



It is important to link the damage mechanism to the most likely resulting__________



In general, an RBI program will be managed by plant inspectors or inspection engineers, who will normally manage risk by managing the POF with inspection and maintenance planning. They will not normally have much ability to modify the ____________________:
a. process flow
b. failure mode
c. POF
d. COF.



The consequence of loss of containment is generally evaluated as loss of fluid to the____________________:



A quantitative method involves using a _____________depicting combinations of events to represent the effects of failure on people, property, the business and the environment :



Results of a quantitative analysis are usually __________________:



It is important to stress that the ____________ of the data should match the complexity of the RBI method used :



The data quality has a direct relation to the relative _________________ of the RBI analysis:



It is important to stress that the ____________ of the data should match the complexity of the RBI method used :



__________in the hydrocarbon process industry are addressed in API 571:



Failure modes identify how the damaged component will_______________



The RBI team should consult with a ______________ to define the equipment damage mechanisms:



Identifying trace constituents (ppm) in addition to the primary constituents in a ____________can be very important as trace constituents can have a significant affect on the damage mechanisms:



Once a credible damage mechanism(s) has been identified, the associated _______________ should also be identified:



In some cases, damage by one mechanism may progress to a point at which a different mechanism takes over and begins to dominate the rate of __________________:



The probability analysis in an RBI program is performed to estimate the probability of a specific adverse consequence resulting from a ______________that occurs due to a damage mechanism(s):



It should be noted that damage mechanisms are not the only causes of loss of containment. Other causes of loss of containment could include but are not limited to all EXCEPT the following:



The accuracy of any type of RBI analysis depends on what?



Changes in the __________________, such as pressure, temperature or fluid composition, resulting from unit abnormal or upset conditions should be considered in the RBI assessment:



The _______________ of the data should be consistent with the RBI method used:



An RBI study may use a qualitative, semi-quantitative and/or quantitative approach. A fundamental difference among these approaches is the amount and detail of :



Generally, a qualitative analysis using broad ranges requires a higher level of judgment, skill and understanding from the user than a more ____________ approach:



________________ uses logic models depicting combinations of events that could result in severe accidents and physical models depicting the progression of accidents and the transport of a hazardous material to the environment:



The semi-quantitative analysis typically requires the same type of data as a quantitative analysis but generally not as:



The data quality has a direct relation to the relative _________________ of the RBI analysis:



As is true in any inspection program, data validation is essential for a number of reasons. Among the reasons for inspection data quality errors are all of the following EXCEPT :



Unfortunately, when this __________________ step has not been a priority before RBI, the time required to do it gets included with the time and resources necessary to do a good job on RBI, leaving the wrong impression with some managers believing that RBI is more time consuming and expensive than it should be :



The selection and type of _______________ used by a facility can have a significant impact on RBI results:



Facilities approaching the end of their economic or operating service life are a special case where _______________ can be very useful. The end of life case for plant operation is about gaining the maximum remaining economic benefit from an asset without undue personnel, environmental or financial risk:



The scope of an RBI assessment may vary between an entire refinery or plant and a single component within a single piece of equipment. Typically, RBI is done on multiple pieces of equipment (e.g. an entire process unit) rather than______________________:



If the scope of the RBI assessment is a multi-unit facility, the first step in the application of RBI is screening of entire process units to rank ____________:



It is often advantageous to group equipment within a process unit into ____________________ where common environmental operating conditions exist based on process chemistry, pressure and temperature, metallurgy, equipment design and operating history:



_________diagrams for the unit may be used to identify the systems including information about metallurgy, process conditions, credible damage mechanisms and historical problems:



In most plants, a large percentage of the total unit risk will be concentrated in a relatively small percentage of the____________________. These potential high-risk items should receive greater attention in the risk assessment:



When emergency systems (e.g. flare systems, emergency shutdown systems) are included in the RBI assessment, their service conditions during both ___________should be considered:



The purpose of establishing _______________is to identify key process parameters that may impact deterioration:



Process conditions during start-up and shutdown can have a significant effect on the risk of a plant especially when they are more severe (likely to cause accelerated deterioration) than normal conditions, and as such should be considered for all equipment covered by the RBI assessment. A good example is____________________:



The normal operating conditions may be most easily provided if there is a process flow model or ____________________ available for the plant or process unit:



Codes and legal requirements vary from one ____________________to another:



An RBI assessment is a ______________________process:



From the understanding of ________________, an inspection program may be designed that optimizes the use of inspection and plant maintenance resources:



The results of managing and reducing risk are all of the following EXCEPT:



Reducing inspection costs is usually not the primary objective of an__________________, but it is frequently a side effect of optimization:



More effective infrequent inspections may be substituted for less effective frequent inspections:



RBI focuses efforts on areas where the ___________________risks exist :



Changing metallurgy of components can reduce ___________:



The objective of RBI is to direct management’s decision process of prioritizing resources to ______________________:



Reduce or limiting available inventories can reduce by what



Impending failure of pressure equipment is not avoided by inspection activities unless the inspection precipitates risk mitigation activities that change the ____________ :



The primary product of an RBI effort should be an _____________ for each equipment item evaluated:



An RBI assessment made on new equipment or a new project, while in the design stage, may yield important information on potential risks. This may allow potential risks to be __________ and have a risk-based inspection plan in place prior to actual installation:



For risks considered unacceptable, the plan should contain the mitigation actions that are recommended to reduce the ________________ to acceptable levels:



The Fitness-For-Service assessment is often accomplished through the knowledge and expertise of the inspector and engineers involved when deterioration is within 57. known acceptable limits, but on occasion will require an engineering analysis such as those contained in API_______:



Some risks cannot be adequately managed by inspection alone. Examples where inspection may not be sufficient to manage risks to acceptable levels are:



The risk-based inspection methodology is intended to complement other risk-based and safety initiatives. The output from several of these initiatives can provide input to the RBI effort, and RBI outputs may be used to improve safety and risk-based initiatives already implemented by organizations. Below are examples of some of these other initiatives EXCEPT the following :



Potential hazards identified in a PHA will often affect the ______________ side of the risk equation:



The RBI system will improve the focus of the inspection plan, resulting in a strengthened _____ program:



Equipment ___________ programs can provide input to the probability analysis portion of an RBI program:



A physical condition or release of hazardous material that could result from component failure and result in human injury or death, loss or damage, or environmental degradation.



Limitation of any negative consequence or reduction in probability of a particular event.



Methods that use engineering judgment and experience as the bases for the analysis of probabilities and consequences of failure.



An analysis that identifies and delineates the combinations of events and estimates the frequency of occurrence for each combination and estimates the consequences.



__________ uses logic models depicting combinations of events.



Quantitative risk analysis logic models generally consist of __________ and __________



__________ delineate initiating events and combinations of systems successes and failures


Question 1 of 67

Latest API 580 Exam Questions and Answers
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In the API 580 Risk-Based Inspection (RBI) exam, there are a total of 90 questions. However, only 80 of these questions are scored, while the remaining 10 are unscored pre-test questions used for statistical purposes. The exam duration is 3.25 hours, allowing candidates sufficient time to answer all the questions and review their responses. These questions cover various topics related to Risk-Based Inspection principles, methodologies, and applications. It is important to thoroughly study the API 580 standard and understand the concepts and principles associated with RBI to prepare effectively for the exam. It is important to allocate your time wisely during the exam to ensure you can complete all the questions within the given timeframe.

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API 580-581 – Risk Based Inspection Question and Answers

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Q.1. Successful implementation of RBI will give guidelines for:

  • a. Appropriate inspection methods, extent of inspection and inspection intervals,
  • b. Suggestions for Risk mitigation activities,
  • c. Managing the residual level of risk after inspection and other mitigation actions have been implemented.
  • d. All of above

Q.2. API 580 is specifically targeted at the application of RBI for:

  • a Hydrocarbon industries Oil & Gas
  • b Chemical process industries
  • c Power plants for Electric generation
  • d Only a and b above

Q.3. The graphical representation of scenarios from initiation to potential outcome of an accident will be typically called as :

  • a Event tree
  • b Fault tree
  • c Risk tree
  • d Result tree

Q.4. API 580 does not cover RBI assessment for:

  • a Process piping
  • b Storage tanks
  • c Structural systems
  • d Pressure relief devices

Q.5. The 3 approaches in RBI are typically called

  • a Qualitative, Semi-Qualitative, Realistic
  • b Quantitative, Semi-Quantitative, Qualitative
  • c Realistic, Quantitative, Qualitative
  • d None of above

Q.6. RBI methodology can be adopted for :

  • a Entire operating unit
  • b Section of operating unit
  • c Major system or major equipment
  • d All of above

Q.7. Risk Management means:

  • a Risk mitigation only
  • b Risk mitigation and risk acceptance
  • c Risk mitigation, risk acceptance and risk communication
  • d Risk assessment, risk mitigation, risk acceptance, and risk communication.

Q.8. The term “failure” used for Failure Analysis in RBI typically means:

  • a Failure due to human error
  • b Power failure
  • c Loss of containment
  • d All of above

Q.9. “Risk driver” in RBI means

  • a An item affecting probability significantly,
  • b An item affecting consequence significantly,
  • c An item affecting the either probability or consequence or both the significantly.
  • d A rash driver driving the plant vehicle who causes significant risk to plant personnel.

Q.10. In RBI analysis ‘ ALARP’ means:

  • a Always likely and reasonably possible
  • b As large as reasonably practical
  • c As large as reasonably profitable
  • d As low as reasonably practical

Q.11. Qualitative risk analysis means

  • a A risk analysis based on Quality control plans of equipment
  • b A risk analysis that uses broad categorizations for probabilities and consequences of failure for purpose of risk ranking
  • c A risk analysis that uses NDT methods to evaluate risks
  • d A risk analysis that uses high quality data for detailed numerical analysis

Q.12. RBI typically is focused on systematic determination of _______ for risk analysis and risk ranking

  • a Absolute risk
  • b Realistic risk
  • c Relative risk
  • d Residual risk

Q.13. “ISO risk line” typically represents:

  • a Constant risk level
  • b Risk acceptable to international organization for standards
  • c Incident specific occurrence of risk level
  • d None of above

Q.14. Risk Matrix and Risk Plot are typically used for:

  • a Risk Matrix for Quantitative and Risk Plot for Qualitative analysis
  • b Risk Matrix for Qualitative and Risk Plot for Quantitative analysis
  • c Both can be used for either Quantitative or Qualitative analysis
  • d None of above are correct answers

Q15. Quantitative analysis is less precise than quantitative analysis, but less costly and faster. If your objective is to carry out screening of low risks items/equipment, which type of analysis will you choose?

  • a Qualitative
  • b Quantitative
  • c Quantitative first then Qualitative
  • d API 580 does not give any guideline

Q.16. Effective Inspection by itself can directly reduce risk.

  • (a True
  • (b Wrong

Q.17. For calculating Damage factor for thinning the term ‘age’ means:

  • a Time since installation
  • b Time since RBI study was done
  • c Time since first inspection
  • d Time since last inspection

Q. 18. For finding out damage factor based on ‘inspection Effectiveness’, we should consider

  • a All past inspections
  • b Only last inspection
  • c Only internal inspection
  • d Only external inspection

Q.19. In consequence analysis in API RBI methodology

  • a Only Area-Based Consequence methodology is used
  • b Only Financial-Based Consequence methodology is used
  • c None of above these methodologies can be used
  • d Any of these methodologies can be used

Q.20. In Quantitative analysis the probability of failure depends on

  • a Generic failure frequency only,
  • b Damage factor and generic failure frequency,
  • c Management systems factor, and generic failure frequency
  • d Generic failure frequency , damage factor and management systems factor

Q.21. Choose correct option

  • a The inspection methods will provide little information to correctly identify the true damage state or 20 40% confidence is ‘Poorly Effective’.
  • b The inspection methods that will correctly identify the true damage state in nearly every case or 80–100% confidence is ‘Highly Effective’.
  • c The inspection methods will correctly identify the true damage state about half of the time or 40–60% confidence is ‘Fairly Effective’.
  • d All of above are correct statements

Q.22. In an API RBI assessment, which components should be checked for thinning.

  • a All components should be checked for thinning
  • b 50% components should be checked for thinning
  • c Only the components with General corrosion should be checked for thinning
  • d Only the components with Localized corrosion should be checked for thinning

Q.23. If a piping circuit contains an injection point, then an adjustment factor equal to —— should be used . If a highly effective inspection for injection point circuit (according to API 570 is performed, then this adjustment factor is D.

  • a 3, 2
  • b 2, 0
  • c 3, 1
  • d 2, 1

Q.24. A vessel is in service since year 2003. It is undergoing General corrosion. Up to now, two inspections with external 30% scanning by manual UT were done, and one internal inspection with 60% examination of the surface partial internals removed accompanied by thickness measurements was done. There is no On-Line Monitoring.

The value of Art parameter is 0.20. What is the Damage Factor?

  • a 4
  • b 1
  • c 10
  • d 5

Q.25. For above vessel if corrosion was localized instead of general. Two inspections with 30% manual UT scanning, and spot thickness measurements at areas specified by a corrosion specialist were done. Also one internal inspection with 60% visual examination and spot UT measurements was done. There is no On-Line Monitoring.

The value of Art parameter is 0.20. What is the Damage Factor?

  • a 10
  • b 70
  • c 35
  • d 3

Q26. A vessel is in service since year 2003. It is undergoing Chloride stress corrosion cracking. Choose the correct answer.

  • a External Spot Radiography and Spot shear wave ultrasonic is ‘Usually Effective inspection
  • b Wet fluorescent magnetic particle testing of 100% weldments done from inside is ‘Highly Effective inspection’ .
  • c Visual inspection done from inside is ‘Fairly Effective inspection’ .
  • d None of above are correct answers

Q.27. In Chloride SCC, if cracking is known to be present then for calculating damage factor Severity Index to be used is:

  • a 1
  • b 50
  • c 500
  • d 5000

Q. 28. A Carbon steel insulated vessel is operating in marine weather . Temperature=160 deg. F. The Insulation is Fiberglass. Considering the vessel nozzles, the complexity is can be determined as ‘above average’ and the insulation condition is ‘average’ What corrosion rate is to be used for Damage Factor

a 15.6mpy
b 12.5mpy
c 19.5mpy
d 10 mpy

Q. 29. As per API 581, Financial-Based Consequence of $ 200,000 is categorized as category ——- in consequence categories:

  • a A
  • b B
  • c C
  • d D

Q. 30. As per API 581, affected Area of 1600 sq. meters is categorized as category —-— in Area-Based Consequence.

  • a B
  • b C
  • c D
  • d E

Q.31. Logic models Event Tree and Fault tree are extensively used in :

  • a Qualitative Analysis
  • b Quantitative Analysis
  • c Used in both a and b
  • d Used in neither a or b

Q.32. “Fault Tree” represents a logical model showing

  • a Initiation of an event and its consequences
  • b Various ways which lead to the occurrence of event
  • c Faults in Design and Construction of equipment
  • d Faulty in operation and maintenance of the equipment

Q.33. Typical parameters used for assessing environmental damage are:

  • a Acres of land affected per year
  • b Miles of shoreline affected per year
  • c Number of human-use resources affected
  • d All of above

Q.34. Determining representative fluid and selecting a set of hole sizes is essential step in:

  • a Qualitative approach only
  • b Quantitative approach only
  • c Essential for both
  • d Essential for none

Q.35. In RBI consequence analysis all releases are modeled in two types, namely :

  • a Instantaneous release and continuous release
  • b Continuous release and intermittent release
  • c Intermittent release and Instantaneous release
  • d “Puff” release and Instantaneous release

Q.36. In RBI consequence analysis, if fluid inside the vessel is liquid but its boiling point is less than ambient temperature , the phase considered for consequence analysis will be taken as :

  • a Solid
  • b Liquid
  • c Gas
  • d Liquid – Gas mixture

Q. 37. Probability of leak of a flammable fluid is 0.002, probability that it will catch fire is 0.5. What is probability of fire ? ( There is no solation/detection system

  • a 50%
  • b 0.0001
  • c 0.001
  • d 2 %

Q.38. Which of the following would most unlikely result in Metallurgical deterioration

  • a HTHA
  • b Fatigue
  • c CUI
  • d Chloride SCC

Q.39. Since RBI is a proven and sound risk management principle; it does not matter if designs/installations are faulty

  • a True
  • b False
  • c Cannot say

Q. 40. Engineering judgement and experience of the analyst are most required for which type of RBI assessment

  • a Quantitative
  • b Qualitative
  • c Semi-quantitative
  • d All of above

Q.41 In POF calculations Generic Failure Frequency needs to be adjusted by using an adjustment factor which depends on the damage mechanisms that are active in a component and the type of inspection performed. This factor is called

  • a Inspection factor
  • b Component factor
  • c Safety factor
  • d Damage factor

Q.42. Identify Correct Statement

  • a Properly implemented and correctly monitored RBI generally will result in Zero Risk
  • b Properly implemented RBI will generally leave “Residual Risk “
  • c Properly implemented RBI will give guidance on inspection plan and inspection intervals.
  • d b and c above are correct statements

Q.43. Mass of fluid available for release in a pressure vessel consists of

  • a Mass of fluid in pressure vessel
  • b Mass of fluid in pressure vessel + additional mass added in 3 minutes as limited to a 203 mm [8 in.] release hole size.
  • c Inventory Group Mass
  • d Lower of b and c

Q.44. Consequence of toxic release area should take into account:

  • a Area for the personnel injury
  • b Area for component damage
  • c Total of Both a and b
  • d Lower of a and b

Q.45. Integrity operating window is:

  • a Window provided in the plant wall for operating Process valves
  • b Limits for process variables which if changed beyond limits, will affect integrity of equipment
  • c Imaginary boundary enclosing equipment that is subject to same damage mechanisms
  • d None of above

Q.46. Release hole size for rupture for consequence analysis for a 30” dia pressure vessel Is

  • a 4”,
  • b 30”,
  • c 16 “,
  • d 10”

Q.47. In RBI, Sonic and subsonic release is applicable for:

  • a Liquid Release only
  • b Vapor Release only
  • c For both type Releases
  • d For None of above releases

Q.48. In RBI API 581 Quantitative analysis, Consequences for which of the following re considered

  • a Flammable Consequences
  • b Toxic Consequences
  • c Non-Flammable Non-Toxic Consequences
  • d All of above

Q.49. The parameter Art and Severity index SVI determine the damage factors. Choose correct choice from following.

  • a Parameter Art is used for thinning and Severity index SVI for cracking
  • b parameter Art and Severity index SVI both are used for cracking
  • c parameter Art and Severity index SVI both are used for thinning
  • d Parameter Art is used for cracking and Severity index SVI for thinning

Q. 50. The lowest temperature at which a fluid mixture can ignite without a source of ignition is called

  • a Auto-Ignition Temperature
  • b Ignition Temperature
  • c Flash-point Temperature
  • d Dew-point Temperature

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