Subsea Pipeline Integrity Management Course Program
September 10-12 2008 • Houston, Texas
DAY ONE
8:00 Registration, coffee
8:30 Welcome and introduction
8:45 INTRODUCTION
- Introduction
- Defect Assessment (Corrosion, Dent and Cracks)
- Fitness-For-Service (FFS) Assessment
- Risk-Based Inspection (RBI)
- Integrity Management software
9:45 REMAINING STRENGTH OF CORRODED PIPE
- Determination of maximum allowable defect depth
- Maximum allowable design pressure & safe maximum pressure
- NG-18, B31G, Modified B31G, Rstreng
10:30 Coffee Break
10:45 MOMENT CAPACITY OF CORRODED PIPE UNDER AXIAL FORCE AND PRESSURE
- Stress distribution over cross-section
- Moment capacity under axial force and internal pressure
- Moment capacity under axial force and external pressure
- Guideline for ultimate strength criteria.
12:00 Lunch
1:00 RESIDUAL STRENGTH OF DENTED PIPES WITH CRACKS
- What is the dent depth?
- Is the dent associated with a weld, a crack/gouge?
- Dent types (smooth, plain, kink, constrained, unconstrained)
- Dent assessment per B31.8
- Burst strength of dented pipe with cracks
- Fatigue of dented pipes
2:00 Coffee
2:15 MOMENT CAPACITY OF DENTED PIPE UNDER AXIAL FORCE AND PRESSURE
- Stress distribution over cross-section
- Moment capacity under axial force and internal pressure
- Moment capacity under axial force and external pressure
- Guideline for ultimate strength criteria
3:15 CASE STUDY #1: CORRODED PIPELINE CALCULATION EXAMPLES
- Example calculations will be performed by course attendees based on the
methodology given in Subsea Pipelines & Risers, by Yong Bai & Qiang Bai:
Elsevier Science (2005).
4:15 CASE STUDY #2: DENTED PIPELINE CALCULATION EXAMPLES
- Example calculations will be performed by course attendees based on the methodology
given in Subsea Pipelines & Risers, by Yong Bai & Qiang Bai: Elsevier Science (2005)
5:00 Close of Day One
DAY TWO
7:45 Coffee
8:00 GIRTH WELD DEFECTS AND CORROSION DEFECTS IN CIRCUMFERENTIAL WELDS
- Circumferential failure in girth weld defects
- Plastic collapse (local & global)
- Local buckling
- Plastic fracture
9:00 ALLOWABLE WAVE-HEIGHT FOR CORRODED RISERS ON JACKETS
- Morison’s equations
- Current velocity
- Force-transfer coefficients
- Long-term stress distribution – Deterministic approach
- Long-term stress distribution – Spectral approach
9:45 Coffee Break
10:00 CASE STUDY #3 ASSESSMENT OF CORRODED RISERS ON JACKET LEGS
- Environmental conditions (wave height & spectrum)
- Calculation of wave-induced bending moment
- Calculation of allowable bending moment
- Maximum allowable wave heights
11:00 Coffee Break
11:15 ASSESSMENT OF FREE-SPANS IN SUBSEA PIPELINES
- Reduced velocity
- Pipeline natural frequency
- Onset of in-line vibrations
- Onset of cross-flow vibrations
- Static stress criterion
12:00 Lunch
1:00 QUALITATIVE RISK-BASED INSPECTION (RBI)
- Risk estimate
- Probability of failure (PoF)
- Consequence of failure (CoF)
- RBI for corroded pipelines
- RBI for free-spanning pipelines
2:00 Coffee Break
2:15 FITNESS-FOR-SERVICE (FFS) ASSESSMENT
- Identification of future pipeline integrity conditions
- Factors requiring FFS assessment:
- Changes in design/operating parameters
- Changes in code and standards
- Defects and their growth
- Life extension
- FFS Assessment Procedure
3:00 Coffee Break
3:15 QUANTITATIVE RISK-BASED INSPECTION (RBI)
- Risk definition (Safety, environmental pollutions, business opportunity)
- Risk acceptance criteria (Safety, environmental pollutions)
- Probability of failure (PoF)
- Consequence of failure (CoF)
- RBI for corroded pipelines
- RBI for free-spanning pipelines
- Example #1: RBI of a corroded pipeline
4:15 CASE STUDY#4 : RBI & FFS APPLIED TO CORRODED PIPELINES
- RBI (Qualitative vs. Quantitative)
- FFS (when to use, what are its applications?)
- FFS assessment of a corroded pipeline
- Reliability-based assessment of a corroded pipelines
5:00 Close of Day Two
DAY THREE
7:45 Coffee
8:00 SUBSEA RISK ASSESSMENT
- Acceptance criteria (Risk of individuals; societal risk; environmental risk)
- Identification of initiating events
- Cause analysis (Fault tree analysis; event tree analysis)
- Probability of initiating events
- PoF estimates based on qualitative review and incident databases
- PoF estimates based on structural reliability analysis
- CoF estimates (first- party individual; societal; environmental, material loss)
- Example #1: Risk assessment of a subsea gas pipeline
- Example #2: Dropped object risk assessment
9:00 HUMAN FACTORS
- Human and organization factors (HOF)
- Human error identification
- Human error analysis
- Human error frequency
- Human and organization error
9:45 Coffee Break
10:00 LIFE-CYCLE-COST OPTIMIZATION
- CAPEX – Initial cost
- OPEX – Operating expenditure
- RISKEX – Risk expenditure
- Life-cycle-cost
- Example #1: On-bottom stability analysis
11:00 Coffee Break
11:15 FLEXIBLE RISER AND UMBILICAL INTEGRITY
- Failure statistics
- Failure drivers
- Failure modes
- Integrity management strategy
- Inspection measures
- Monitoring
- Testing and analysis measures
- Steel tube umbilical integrity
12:00 Lunch
12:00 Close of Course
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