8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
1/18
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
2/18
Interpretation of SubseaInspection Data
Subsea Integrity Management Summit
Dharmik Vadel
10 September 2013
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
3/18
of 18
Agenda
3
Objectives of inspection
Inspection planning
Data interpretation examples
Marine growth observations
Cathodic protection data
UT wall thickness data
Considerations for future inspections
Conclusions
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
4/18
of 18
Objectives of Inspection
4
GovernmentRegulations
Organizational Goals
Industry Best Practices
Design Requirements
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
5/18
of 18
Objectives of Inspection
5
Determine Fitness for Service
Confirm effectiveness of barrier(s)
Increase knowledge of operationalcondition(s)
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
6/18
of 18
Inspection Planning
6
Compliance
Fitness for ServiceWhy
Equipment (Object/Defect/Extent)What Internal/External
Fatigue critical locations
Anomalous locationsWhere Risk based
Prescriptive
Event basedWhen
GVI, CVI, UT, CP, Pigging
How Operators, Inspectors, Engineers
Certification/TrainingWho
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
7/18
of 18
Inspection Data Types
7
Pictures Videos
Report Tables
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
8/18
of 18
Data Quality and Relevance
8
Subsea field Equipment(s)Scope
Inspection tool calibration Post processingQuality
Failure mechanism Trends analysis
Barriers/Mitigation effectivenessRelevance
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
9/18
of 18
Data Interpretation Process
9
Way Forward Way Forward Engineering
Assessment
Engineering
Assessment
Potential Risks Potential Risks Observations Observations
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
10/18
of 18
Data Interpretation
Marine Growth
10
www.iev-group.com
www.seatrepid.com
www.seatrepid.comwww.seatrepid.com
www.offshore-technology.com
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
11/18
of 18
Data Interpretation
Marine Growth
Observations
Levels of marine growth
Interference with visual condition assessment
PotentialRisks
Reduction in VIV suppression effectiveness
Clashing risk from increased drag
EngineeringAssessment
Trend analysis baseline/historic MG levels
VIV fatigue analysis
Clashing analysis
Way
Forward
Marine growth cleaning intervals
Visual inspections
www.iev-group.com
www.seatrepid.com
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
12/18
of 18
Data Interpretation
Cathodic Protection Data
12
www.diveworks.com.au www.mackayunderwater.co.ukwww.red7marine.co.ukwww.stoprust.com
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
13/18
of 18
Data Interpretation
Cathodic Protection Data
Observations
Cathodic potential measurements
Anode wastage levels
Potential
Risks
Inadequate cathodic protection
Increased external corrosion risk
Engineering
Assessment
CP system design review
Trend analysis Baseline/Historic CP results
Determination of remaining life of anodes
Way
Forward
CP inspection intervals
Retrofit anode sled
www.iev-group.com
Keel joint
Mudline
Hard Tank
Riser
-1100mV -700mV-mV(Ag/AgCl)
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
14/18
of 18
Data Interpretation
UT Inspection Data
Observations
Wall thickness measurements
Visual corrosion/coating damage
PotentialRisks
Potential for leak
Excessive wall loss derate system
EngineeringAssessment
Fitness for service assessments
Trend analysis baseline/historic UT data
Determination of remaining life
Way
Forward
UT inspection intervals
Wall thickness loss rate
Permanent mitigation
www.iev-group.comwww.iev-group.com
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
15/18
of 18
Considerations for Future
Inspections
Risk Assessment is a tool todefine inspection intervals
Inspection work scopes
Define specific requirements
Provide historic information
Inspection data sheetsversus data logs
Video quality and displayrequirements
HD versus SD
ROV overlay
Inspection tools
Repair kit, Cleaning, CP, UT
15
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
16/18
of 18
Effective Work Scope - Examples
CP measurement
locations
Flange and boltcorrosion
16
www.diveworks.com.au
CP Location1
West Side
AB
CD
www.storktechnicalservices.com
NorthFlange 21
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
17/18
of 18
Conclusion
Interpretation of subsea inspection data depends upon
Relevant and quality inspection data Baseline and historic inspection data
Knowledge of equipment design
Awareness of potential risks to your equipment
A successful inspection campaign depends upon
Inspection planning
Detailed work scopes
Communication - pre and post inspection meetings
Right people for the right job
Review and update your inspection cycle periodically
based on documented operational history 17
8/10/2019 1837aa3901aa94f940c8486e735a6c8b 2013 Subsea IM Summit Interpretation of Subsea Inspection Data
18/18
of 18
Top Related