isk-Based Inspection (RBI) is a systematic approach that enables users to make informed business decisions regarding inspection and maintenance expenditure. It identifies, assesses and maps industrial risks (due to corrosion and stress cracking), which can compromise equipment integrity in both pressurized equipment and structural elements. RBI combines the principles of risk with operational experience to obtain a safe and cost effective inspection program targeting inspection where and when it is needed. Also addresses risks that can be controlled through proper inspections and analysis.

1. Risk Based Inspection
Make
Informed
Business
Decisions

2. Reduce Operating margins
and improve Availability
at your plant
Risk is dynamic and changes with time
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3. C
O
N
T
E
N
T
RBI
Arrelic RBI Methodology
Likelihood Assessment – Degradation Mechanism
Consequence Assessment
Risk Ranking
Strategy Management: Inspection
RBI Data Sensitivity
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4. “ A risk assessment and management process that is
focussed on loss of containment due to material
deterioration. These risks are managed primarily
through equipment inspection ” - API 580
RBI
RBI focusses on relative risk
RBI is the strongest tool for managing the risk of pressure containing equipment
Chaos
Fire-Fight
Bureaucracy
Excellent
Weak Strong
SYSTEMS
PEOPLE
WeakStrong
Performance = People x Systems
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5. Residual Risk Factors:
✓ Human Error
✓ Natural Disasters
✓ External Events
✓ Consequential effects from associated equipment in the same unit
✓ Deliberate acts
✓ Fundamental limitations of inspection methods
✓ Design Errors
✓ Unanticipated damage mechanisms
Can risk be reduced to zero?
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6. Upfront corrosion
engineering & data
gathering
Sustainable RBI Process
RBI System Identification
▪ RBI System Definition
▪ Potential Degradation Mechanism
Collecting & Loading Design & Process Data
Executing Inspection Strategies
• Documenting Inspections
• Updating Plans and Inspection History
• Generalizing & Tracking
Recommendations
Developing Inspection Strategies
• Generating RBI Recommendations
• Finalizing Inspection Strategies
Risk Assessment
• Degradation Mechanism Evaluation
• Consequence Evaluation
• Risk Ranking
Other Historical Data
• Maintenance History
• Process Excursion Conditions
A
B
C
D
RBI
Methodology
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7. External Corrosion DM Evaluation
Internal Corrosion
External Corrosion
Environmental Cracking
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8. Consequence
Evaluation
Elements
Flammable Consequence
Safety Consequence
Environmental Consequence
Health Consequence
Reputation Consequence
Finance/ Ops Consequence
Toxic Consequence
Product Leak Consequence
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9. Cumulative
Likelihood of
Failure (LOF)
from
individual
PDM
evaluation
Risk = LOF
x COF
Risk Ranking
based on a
5 x 5 Risk
Matrix
Cumulative
Consequence
of Failure
(COF) from
individual
Consequence
Evaluation
R
i
s
k
R
a
n
k
i
n
g
R
e
s
u
l
t
s
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10. Risk Assessment
and set rules of
strategy are basis
to generate RBI
Guidelines
Review/ Assessment
of RBI
recommendations
Strategy Management: Inspection
Steps for Arrelic
RBI Strategy
Management
Approval
becomes
Inspection tasks.
These tasks
include inspection,
scope, interval
and method
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11. Identify the input
values that have the
greatest impact on
risk/criticality
Predict effects of
changing these input
variables
RBI Data Sensitivity
1
2
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12. Industrial
IoT Sensors
Machine
Analytics
Predictive
Maintenance
Education
& Training
Reliability
Consulting
Talent
Acquisition
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