presentation on integrity

8/13/2019 Presentation on Integrity

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Integrity Management ofRiser and Subsea Systems

Steve Hatton

Peter Falconer

Thursday, 21 February 2008


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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


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Background- Market Need

Risers are welded tubular structures

State 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


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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, interestas 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 theasset


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Life of field protection

Operations Issues

Personnel changes

Service changes

Reservoir changes

Accidents

Events

Expertise

Design

Fab

Inst

Corrosion

Fatigue


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Providing effective barriers?


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Integrity management

How often should

we inspect?

How muchmonitored data

should we collect?

How critical is our

next intervention?

How often should

we inspect?

How muchmonitored data

should we collect?

How critical is our

next intervention?


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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


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Monitoring

Corrosion

Accelerations Inclination

Angular rate

Displacements Stress and strains

Curvature

Heading Pressure

Temperature

Environmental


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Continuous process


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Fatigue tracking methods

2: Environmental1: Structural


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Often measuring:

Riser tension and stroke inconjunction 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 riserresponse data


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ASSURESystems and INTEGRIProducts

moorASSURE

flexASSURE

ttrASSURE

drillASSURE

scrASSURE

slorASSURE

INTEGRIpod M Stand alone Motion loggerINTEGRIpod MA Acoustic Motion logger

INTEGRIstick Bending

INTEGRIcollar Tension / bendingINTEGRIcuff Mooring Chain

Integrity SystemsUsing

Monitoring Products


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Summary

IM programme is critical in maintaining subsea and riserassurance

Competence of team is essential

Inspection must be looked at in conjunction with effectivemonitoring

Aims should be identified before installing monitoringsystems

Subsea monitoring offers significant benefits to risk

reduction

Monitoring systems are effective in providing earlywarning of anomaly development and to confirm integrity

2H is established as a market leader

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