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Structural Integrity Management and Risk Based Inspection – Recent Developments
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G. Abdel Ghoneim, Ph.D., P.E.08 December 2009
Structural Integrity Management and Risk Based Inspection Recent DevelopmentsSNAME Texas Section Meeting
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
2
Agenda
Introduction Gulf of Mexico Activity SIM and RBI Fundamentals Recent Standards Challenges Summary
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
309 December 2009
GOM Platform Activity
Source: MMS0
100
200
300
400
500
600
700
800
900
400
WaterDepth(ft)
N
o
.
o
f
S
t
r
u
c
t
u
r
e
s
19451972
19731982
19832009
Source: MMS, B.J. Kruse, III
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
4
GOM Platform Decommissioning
GoM Platform Vintage (Years)
15%
25%
30%
30%
30
Total ~ 3,900 Platforms
Average Removal Age ~ 16 years
Source: MMS, B.J. Kruse, III, K. S. Patterson, WISTA Oct 2008
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
5
The Issues
Source: O'Connor, BP, M. Lalani, June 2007
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
6
API RPs and Guidelines API 2A-WSD, Recommended Practice for Planning Designing and Constructing Fixed
Offshore Platforms Working Stress Design.
API 2A-LRFD, Recommended Practice for Planning Designing and Constructing Fixed Offshore Platforms Load and Resistance Factor Design.
API Bulletin 2TD, Guidelines for Tie-downs on Offshore Production Structures for Hurricane Season.
API 2T, Recommended Practice for Planning Designing and Constructing Tension Leg Platforms.
API 2FPS, Recommended Practice for Planning Designing and Constructing Floating Production Systems.
API 2SK, Recommended Practice Design and Analysis of Stationkeeping Systems for Floating Structures.
API 2RD, Recommended Practice Design of Risers for Floating Production Systems (FPSs) and Tension-Leg Platforms (TLPs).
API 2I, Recommended Practice In-Service Inspection of Mooring Hardware for Floating Drilling Units.
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
7
API 2HINS Inspection Initiator Process
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
8
Destroyed GoM Platforms
2 3
148
3 2 3 3
40
7 7
47
69
2
60
0
10
20
30
40
50
60
70
80
1948 1961 1964 1965 1969 1974 1979 1985 1992 2002 2004 2005 2005 2008 2008
Year
N
u
m
b
e
r
o
f
P
l
a
t
f
o
r
m
s
D
e
s
t
r
o
y
e
d
2.00E-04
1.00E-03
5.00E-04
1.00E-03
5.00E-044.00E-04
1.00E-050.00E+00
2.00E-04
4.00E-04
6.00E-04
8.00E-04
1.00E-03
1.20E-03
Stiff, 2009 Stiff, 2009 Stahl, et.al.,2000
THIC, 1992 Stahl, 1986 ISO 19901-2,2004
ISO 19902,2008
Source
A
n
n
u
a
l
F
a
i
l
u
r
e
P
r
o
b
a
b
i
l
i
t
y
SRRSR =
100SRRSR =
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009 9
Platform Structural AnalysisLoad exposure
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
10
Safety format (LRFD vs. WSD)
FactorResistance
Load and Resistance
P
r
o
b
a
b
i
l
i
t
y
D
e
n
s
i
t
y
MeanLoad
MeanResistance
FactorLoad
CharacteristicResistanceLoad
Characteristic
Requirement Rd
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
11
SIM Process
Management of Change
CompanyPolicy
Reporting and Communication
InformationManagement
Organization andPersonnel
Audits andReviews
ContingencyPlans
SIM Process
Develop Integrity Management Plan (IMP) forStructure / System
Implement IMP for theStructure / System
Learning and Improvement
Hazard Evaluation andRisk Assessment
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009 Slide 12
Principles of Asset Integrity Management Integrity management life cycle activities
Evaluate Risk
Maintain
Inspect
Monitor Integrity
Plan survey
InspectRecordfindings
Evaluate findings
Filter findings
Assess risk(incl. SRS)
Update risk status Update overall
inspection plan
Plan follow upactions
Do follow-up actions
Integrity
FindingsActions
Inspection plan
12
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
13WCT
Seminar April 26,
Why SIM - Ageing Problem? The contribution of structural failure to the total number of historic
accidents is less than 10% based on worldwide data (Kvitrud, et. al., 2001).
The reliability of a structure against environmental loads may become unacceptable in extended lifetime. Subsidence, degradation and changes to the original design may occur at a higher rate in extended platform life.
Lack of data on the structure (e.g. drawings, steel type, welding procedures, inspection results and details about earlier repairs etc.) may result in higher uncertainty.
Using a systematic approach for evaluating whether a structure is safe for use beyond its initial design life, taking the above mentioned issues into account, is the objective of SIMS.
The SIM system has proven invaluable even for relatively newer structures both fixed and floating.
Ersdal, G. Ph.D. Thesis, U of Stavanger, October 2005
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
14
Ageing & Need for SIM & RBI
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
15
What is Risk-Based Inspection (RBI)?
Strategic process for lowering risk and lowering cost An integrated, data-based methodology that factors risk into inspection
decision making
Risk analysis includes not only probability of failure (PoF) but also consequence of failure (CoF)
A qualitative and quantitative process for managing structurres/equipment based on risk analysis
A systematic process that establishes and prioritises risk levels for each component in the structure
RBI is an important element in the SIM system.
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
16
Input data
Condition Evaluation
Action plans
Observations
Events / History
Inspection results
MonitoringAnalyses / (re-)design
Condition evaluations(sections and components)
Activities plan Inspection plan
Inspections
Monitoring results
Operating req. & limits
ORBIT : Main principles
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
17
Terminology Robustness RSR Push-over/Time-domain Assessment/Re-assesment Risk/Reliability RBI Design Life Standards/Regulations Limit States WSD/ASD and LRFD Design Criteria Joint Flexibility SRS Load Factor
Fatigue/Fracture Failure Safety Category Consequence of Failure Category Strength Hazards Acceptability Criteria Air Gap Wave-in-Deck Probabilistic Methods Bayesian Approach Degradation Fitness-for-purpose SIMS Bias
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
18
The Two Main Steps of RBI
Expected RISK Cost
0
1
2
3
4
5
6
1.0E-04 1.0E-03 1.0E-02 1.0E-01Target Failure Probability Level
N
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E
x
p
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C
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s
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Expected Inspection CostExpected Failure Cost
Expected Repair CostTotal Expected Risk Cost
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
19
Key Concepts
The Key Concepts of RBI
RISK = Probability of Failure XConsequence of
FailureGFF Item DFX
Age
Damagetype/rate
Insp.effective.
Damage areaItem repair
Other repairsInjury
Business int.Env. clean up
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
20
Consequence models estimate:- Heat radiation levels from fires- Gas dispersion distances- Durations of fires- Explosion pressures- Number of fatalities per accident- Environmental effect
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
21
Reducing Risk
Inspection frequencies Inspection scope / thoroughness Inspection tools / techniques Inspection practices (internal vs. external) Building more Redundancies Maintenance Proper use/understanding the limitations Emergency response Trained crew Effective communication lines Local knowledge
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
22
Marine Safety Regulations
Classification Societies
Rules
Rules
Classification of Mobile Offshore Units
Formal Safety Assessment
Step 1 HazardIdentification
Step 2Risk
Assessment
Step 5Decision Making
Recommendations
Step 3Risk Control Options
Step 4Cost Benefit Assessment
International Maritime
Organization
MODU Code
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
23
Risk Assessment Hazard review
Hazard checklist
HAZOP (hazard and operability study)
FMECA (failure modes, effects and criticality analysis)
SWIFT (structured what-if analysis)
Risk matrices
Risk ranking
Structured judgement
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
24
Risk Assessment
Major accident
Controls
THREATS CONSEQUENCES
Accident Scenario
Management System
Fault trees
Event trees
Bow tie diagrams
Rules and standards
Engineering judgement
Risk criteria
Cost-benefit analysis
Company values
Unacceptableregion
I
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e
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s
i
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g
i
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d
i
v
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k
s
a
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s
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s
Tolerableregion
Broadly acceptableregion
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
25
Quantitative Methods
Weather Outcome
Severe 50% fatalities0.01
Rough 30% fatalities0.09
Evacuation1.0E-04 Moderate 10% fatalitiesper year 0.4
Calm 5% fatalities0.5
Severe5%
Rough28%
Moderate41%
Calm26%
Historical data analysis
Fault tree analysis
Event tree analysis
Consequence modelling
Evacuation modelling
Risks and uncertainties
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
26
Influences on Technique Selection
Decision context
Lifecycle stage
Major hazard potential
Novelty/non-standard
Uncertainty
Views/perceptions
Techniques
Practicality
Strengths and weaknesses
Good practice
Efficiency
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
27
Traditional Inspection Planning vs. RBI Planning
Traditional
Inspection based on experience (usually by previous failures/breakdowns)
Inspection effort driven by likelihood of failure
Reactive fire fighting, running behind the ball
Use of appropriate / Inappropriate NDT techniques
RBI
Inspection based on experience andsystematic (risk) review
Inspection effort driven by risk, i.e. likelihood of failure and consequences of failure
Pro-active planning and execution of inspections
Systematic identification of appropriate NDT techniques
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
28
Suitable and Sufficient Inspection Planning
Suitable techniques appropriate for the assessment being made
Sufficient adequate to show the risks are ALARP, without requiring further elaboration
S in g le co m p o n e n t co n sid d e re d ; D e sig n l ive = 20 y r
1 .0E-06
1 .0E-05
1 .0E-04
1 .0E-03
1 .0E-02
0 2 4 6 8 10 12 14 16 18 20S e rv ic e tim e in y e a rs
F
a
i
l
u
r
e
p
r
o
b
a
b
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y
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
29
RBI Investment and Savings
$400,000
$65,000$85,000$50,000
$500,000
$675,000
$250,000
$550,000$600,000
$0$100,000$200,000$300,000$400,000$500,000$600,000$700,000$800,000
Total $ Savings = $1.1MROI = 22:1
RBIStudyInvest
Inspect& MaintSavings
ProdCost
Savings
RBIStudyInvest
Inspect& MaintSavings
ProdCost
Savings
RBIStudyInvest
Inspect& MaintSavings
ProdCost
Savings
Total $ Savings = $650,000ROI = 8:1
Total $ Savings = $1.25MROI = 19:1
Chemical Plant Chemical Plant -- 200200Pressure VesselsPressure Vessels
Refinery Refinery -- 3535Pressure VesselsPressure Vessels
Refinery Refinery -- 5050Pressure VesselsPressure Vessels
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
30
$100,000$200,000$300,000$400,000$500,000$600,000$700,000$800,000
$65,000$50,000
$500,000
$675,000
$75,000
$550,000$600,000
$0
Total $ Savings = $1.1MROI = 22:1
RBIStudyInvest
Inspect& MaintSavings
ProdCost
Savings
RBIStudyInvest
Inspect& MaintSavings
ProdCost
Savings
RBIStudyInvest
Inspect& MaintSavings
ProdCost
Savings
Total $ Savings = $1.52MROI = 20:1
Total $ Savings = $1.25MROI = 19:1
Chemical Plant Chemical Plant -- 200200Pressure VesselsPressure Vessels
Offshore InstallationOffshore InstallationPiping & VesselsPiping & Vessels
Refinery Refinery -- 5050Pressure VesselsPressure Vessels
$1,520,000
rbi invesment & savings
Typical ROI = 8:1
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
31
ORBIT Structure
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
32
RBI Detailed Assessment
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
33
RBI Detailed Assessment
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
34
Inspection PlanningChallenges: No general standard, guideline or common industry practice available
for inspection planning for structures
SIMS
RBI analysis
ORBIT/Profast
RBI analysis report
Member condition Inspection history
Updated Master RBI Table- RBI Input and results
Inspection plan (FIPs)
RBI Analysis Process
SIMS FIPs Upload
Orbit Workflow ManagerOrbit Workflow Manager
New fatigue analysis results
Updated FIPs
(input and results)
Master RBI Table (2004)- Fatigue point identification - fatigue damage rates - Analysis Method Fatigue- Analysis Method Collapse- consequence of member failure- preferred inspection method- etc.
Only done ones
New RBI Analysis results (Profast jnl files & database
New fatigue analysis
Fatigue Master Table
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
35
Relevant DNV Publications RP-F107 Pipeline Risk Assessment RP-G101 RBI of Topsides Equipment OS-E304 Offshore Mooring Steel Wire Ropes OSS-121 Class base on Risk Assessment OSS-303 Risk Based Verification OSS-304 Risk Based Verification of Offshore Structures
Available online: webshop.dnv.com
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
36
DNV RP-F107 Pipeline Risk AssessmentCost Benefit Analysis Risk Matrix
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
37
DNV RP-G101 RBI of Topsides Equipment
Maintenance Management System
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
38
DNV RP-G101 RBI of Topsides Equipment
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
39
DNV RP-G101 RBI of Topsides Equipment
ISO 17776 (2000)
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
40
Push-over Analysis
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
41
SIM System
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
42
Decision Time
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SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
43
To document safe use until end of production Date for change in platform operation(from manned to unmanned)
Cost and scheduling of structural mitigation
Objective Reassessment of Jacket Platforms:
Structural Operational Challenges
To document safe use until end of production Date for change in platform operation(from manned to unmanned)
Establish evacuation criteria Cost and scheduling of structural mitigation Inspection planning
Objective Reassessment of Jacket Platforms:
Wave diffraction Earthquake / Accidental Loads
COG
Structural modifications/ Weight Management
Subsidence of seabed/Possible WiD
Foundationcapacity
DeckStrength
Platform strength
New Env.Criteria
Fatigue strength &Inspection planning
Large amount of
information
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
44
Some Challenges
Wave-in-deck-load (WiD) and load on jacket (WoJ) and variation with time
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
2.2 2.7 3.2 3.7 4.2 4.7 5.2 5.7 6.2 6.7 7.2 7.7 8.2 8.7 9.2 9.7
Time (sec)
F
x
(
M
N
)
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
F
z
(
M
N
)
Fx - Total (inc. "jet" effect)Fx - WoJ (incl. "jet" effect)Fx - WoJ (without "jet" effect)Fx - WiD (Comflow)Fz - WoJ Fz - WiD (Comflow)
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
45
Challenges (contd)
Determination of failure criteria P
delta
Excessive deformation
P
Axial joint deformation, delta
Elasticflexibility
Dynamic behavior- Rise time for wave-in-deck load coincide with one quarter of platform
lowest eigenperiod
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
46
New vs. Old
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
47
NORSOK STANDARD N-006, March 2009
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
48
NORSOK Assessment Principles Requirements to in-service inspection planning and structural integrity management
of jacket structures in general may be found in ISO 19902, Clause 23.
Requirements to inspection and condition monitoring are given in ISO 19903, Chapter 14.
Requirements to in-service inspection, monitoring and maintenance are given in ISO 19904-1, Chapter 18.
Shut-down and unmanning procedure shall be implemented in order to ensure that there is less than 5x10-4 annual probability of the facility being exposed to environmental actions exceeding the structural capacity determined according to the ALS, with personnel onboard.
In cases of pollution risk or main safety function impairment it should be shown that the combined probability of a structural failure and leakage that could lead to significant pollution is less than 1x10-4 per year.
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
49
API RP 2SIM (Draft) ToC
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
50
API RP 2SIM (Draft)
Data Evaluation Strategy Program
Managed systemfor archive andretrieval of SIMdata and other
pertinent records
Evaluation ofstructural integrity
and fitness forpurpose;
development ofremedial actions
Overall inspectionphilosophy &strategy andcriteria for in-
service inspection
Detailed workscopes forinspection
activities andoffshore execution
to obtain qualitydata
SIM Process and Document Organization
Data Evaluation Strategy ProgramInitiatorTriggered
Assessment
Yes
No
Source: Draft API RP 2SIM
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SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
51
API RP 2SIM (Draft) RBI Intervals
RiskCategory Inspection Interval Ranges
High 3-years to 5-years
Medium 6-years to 10-years
Low 11-years or greater
Notes:a) The timing for the first underwater periodic inspection should be determined
from the date of platform installation or when the baseline inspection was completed.
b) Risk-based intervals should be adjusted to verify uninterrupted cathodic protection of the platform. This should be based on data evaluation from prior inspections.
Assessment Initiator(See 4.3.5)
Assessment Category(See 4.3.4.4)
Assessment Information(See 7.3)
InadequateDeck Height?(see 4.3.5.1)
Simple Method(see 7.5)
Design Level Method
(see 7.6)
Ultimate Strength Method
(see 7.7)
Alternative Methods(see 7.8)
YES
Assessment MethodsSection 7
Assessment Criteria
- Design Level- Ultimate Strength- Environmental Load
Assessment CriteriaSections 8, 9
- Assessment Type- Assessment Category
- Assessment Criteria- Load Approach
RSR Criteria
- Assessment Category
- Minimum RSR
Pass Assessment? Mitigation and Risk Reduction Section 9
Document(see 4.2)
Consequence of Platform Failure (see 4.3.4)
MitigationAnd Risk
Assessment
AssessmentMethod
Assessment Category
and Assessment Information
Source: Draft API RP 2SIM
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
52
API 2A 20th and 21st Ed. RSRs
Assessment Category Reserve Strength Ratio (RSR)
A-1 High 1.21
A-2 Medium 0.8
A-3 Low 0.62
1. This RSR is applicable only for continued use of the platform for its present purpose. Not applicable for Change-of Use conditions.
2. Not to be used for water depth greater than 400 ft.
Assessment Category Reserve Strength Ratio (RSR)
API RP2A 19th Edition and
Earlier
API RP2A 20th Edition and Later
A-1 High 1.6 2.0
Assessment Category Reserve Strength Ratio (RSR)
GoM L-1 (High) 1.6 for Central Region11.2 for Other Regions
GoM L-2 (Medium) 1.2
GoM L-3 (Low) 1.0
Other U.S. Offshore Areas
2.0
1. Includes platforms located in the associated Transition Regions. The 100-year return period metocean conditions as defined in API RP2 MET should be used to compute the RSR.
20th Ed. GOM
20th Ed. Other U.S. Offshore Areas
21st Ed. GOM
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
53
Summary
Structural Integrity Management (SIM) and Risk based inspection planning (RBI) are tools employed to develop bases for asset management and in-service inspection in order to extend the useful life of the structure and increase its reliability level.
SIM is geared towards managing the asset data and communicating status to corporate management in a systematic manner.
RBI entails: - A risk screening process in order to identify critical areas and summarize the failure
modes. - The consequences of possible failures and repair strategy are established in close
co-operation with the operator. - The costs of inspection and repair for failures are established.- Probabilistic progressive collapse analyses are performed for a number of
representative mechanisms in the structures. - A cost optimal inspection strategy is established.
Finally, a user friendly tailor made software is developed to to perform the life cycle management of the Assets.
Det Norske Veritas AS. All rights reserved.
SIM and RBI Recent Developments
SNAME Texas Section Meeting, 08 December 2009
54
Safeguarding life, property and the environment
www.dnv.com
Structural Integrity Management and Risk Based Inspection Recent DevelopmentsAgendaGOM Platform ActivityGOM Platform DecommissioningThe IssuesAPI RPs and GuidelinesAPI 2HINS Inspection Initiator ProcessDestroyed GoM Platforms Platform Structural AnalysisSafety format (LRFD vs. WSD) SIM ProcessPrinciples of Asset Integrity Management Integrity management life cycle activitiesWhy SIM - Ageing Problem?Ageing & Need for SIM & RBIWhat is Risk-Based Inspection (RBI)?Slide Number 16TerminologyThe Two Main Steps of RBIKey ConceptsSlide Number 20Reducing RiskMarine Safety RegulationsRisk AssessmentRisk AssessmentQuantitative MethodsInfluences on Technique SelectionTraditional Inspection Planning vs. RBI PlanningSuitable and Sufficient Inspection PlanningRBI Investment and Savingsrbi invesment & savingsORBIT StructureRBI Detailed Assessment RBI Detailed AssessmentInspection PlanningRelevant DNV PublicationsDNV RP-F107 Pipeline Risk AssessmentDNV RP-G101 RBI of Topsides EquipmentDNV RP-G101 RBI of Topsides EquipmentDNV RP-G101 RBI of Topsides EquipmentPush-over AnalysisSIM SystemDecision TimeSlide Number 43Some ChallengesChallenges (contd)New vs. OldNORSOK STANDARD N-006, March 2009NORSOK Assessment PrinciplesAPI RP 2SIM (Draft) ToCAPI RP 2SIM (Draft)API RP 2SIM (Draft) RBI IntervalsAPI 2A 20th and 21st Ed. RSRsSummarySlide Number 54