RISK-BASED INSPECTION (RBI)

What is Risk Based Inspection?

• The Risk-Based Inspection (RBI) methodology is used to manage the overall risk of a plant by focusing inspection efforts on the equipment with the highest risk

• The Risk-Based Inspection (RBI) is software used for calculation of consequences of failure

• The Risk-Based Inspection (RBI) methodology is used to manage the overall probabilities of failures of a plant by focusing mitigation efforts on the equipment with the highest risk

• The Risk-Based Inspection (RBI) is a standard used to manage the overall risks of failures in a plant by focusing on the equipment in ALARP region

Act vs Code/Standard? Which one should to comply?

• Act is the highest authority to be complied, if the Act more stringent than standard, then should follow the Act/Regulation

• Code/Standard is the highest authority to be complied, if the standard more stringent than act, then should follow the Code/Standard

Which code / standard should be use during pre-construction & in service?

• Pre-cons: API,

  In service: ASME Sec I

• Pre-cons: ASME Sec I, In service: API

• Pre-cons: ASME PCC 2,

  In service: API

How many types of RBI analysis/assessment?

• 2-Qualitative, Quantitative

• 2-Semi, Quantitative

• 3-Qualitative, Semi, Quantitative

What is factors to be considered in LOF/POF evaluation?

• Health and Safety Impact

• Human and operator errors

• External condition

• Earthquakes

What is factors to be considered in COF evaluation?

• Human error

• Natural disasters

• External events

• Environment, Business impact

How the process to implement RBI?

• Data collection -> Damage mechanism identification -> Risk assessment -> Risk Ranking -> Mitigation -> Insp. Plan -> Reassessment

• Data collection -> Damage mechanism identification -> Risk assessment -> Risk Ranking -> Insp. Plan -> Mitigation -> Reassessment

• Data collection -> Risk assessment -> Risk Ranking -> Insp. Plan -> Damage mechanism identification-> Mitigation -> Reassessment

What is the reference limit for risk acceptance?

• Refer to POF/LOF

• Refer to tolerance line or RAC line

• Refer to COF

What should we do if found the Risk Ranking is above than tolerance?

• Immediate action to be taken FFS, Rerating

• No need to take any action. Just monitor in next outage.

• Immediate action to be taken FFS, Rerating, Repair/replace.

• Develop a prioritized list for more in-depth inspection or analysis

How to identify the Damage mechanism?

• Determine the risk, including a sensitivity analysis, and review risk analysis results for consistency/reasonableness

• Small leak, large leak, rupture

• Article/Study, Corrosion expert judgement