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Integrity Management of Riser and Subsea Systems
Steve HattonPeter Falconer
Thursday, 21 February 2008
About 2H Offshore
Established in 1993
Involved in the design of riser systems and specialist subsea components
Provides independent advice on design, assessment, inspection, mitigation, and monitoring requirements
Pioneered the process of Integrity Management for Deepwater Risers
Background - Market Need
Risers are welded tubular structuresState of the art design with complex loading
Fatigue critical
Complex installations, pushing boundaries of equipment
Short operational history
Failures are unacceptable
Subsea, flowlines and pipelines are similarly important
Riser & Subsea Assurance
2H have been involved in Riser & Subsea IM for
more than 10 years
On one contract alone 2H are currently
responsible for:
8 deepwater field developments
7 types of risers
3 different hull forms
Increasing industry, and regulatory body, interest
as need and benefits become understood
Objectives: To operate and maintain a pipeline & risers in a manner that protects life, property, and the environment for the service life of the asset
Life of field protection
Operations IssuesPersonnel changesService changesReservoir changes
AccidentsEventsExpertise
DesignFabInst
CorrosionFatigue
Integrity management
How often should we inspect?
How much monitored data
should we collect?
How critical is our next intervention?
How often should we inspect?
How much monitored data
should we collect?
How critical is our next intervention?
Risk management
Confidence Rating
Criticality Very Low Low Medium High Very High
Extreme Manually assign inspection interval/ determine monitoring
Very High a b b c d
High b b c d e
Medium b c d e f
Low c d e f g
Negligible d e f g h
Inspection requirements
Coating damageAnode degradationTSA depletion
Missing fairings Excessive marine growth
Monitoring
CorrosionAccelerationsInclinationAngular rate DisplacementsStress and strainsCurvatureHeadingPressureTemperatureEnvironmental
Often measuring:
Riser tension and stroke – in conjunction with vessel motion and environment
Typical arrangement:
3 or more load cells allowing bending moment to be determined
ROV installed motion loggers
Internal annulus pressure
Top tensioned riser response data
ASSURE Systems and INTEGRI Products
moorASSUREflexASSUREttrASSUREdrillASSUREscrASSUREslorASSURE
INTEGRIpod M – Stand alone Motion loggerINTEGRIpod MA – Acoustic Motion loggerINTEGRIstick – Bending INTEGRIcollar – Tension / bending INTEGRIcuff – Mooring Chain
Integrity SystemsUsingMonitoring Products
Summary
IM programme is critical in maintaining subsea and riser assurance
Competence of team is essential
Inspection must be looked at in conjunction with effective monitoring
Aims should be identified before installing monitoring systems
Subsea monitoring offers significant benefits to risk reduction
Monitoring systems are effective in providing early warning of anomaly development and to confirm integrity
2H is established as a market leader