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Current Riser & Subsea Technology Issues being addressed by MCS Dr Patrick O’Brien, Director, MCS PowerPoint Presentation
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PRESENTATION PREPARED FOR SUBSEA SOLUTIONS 06. Current Riser & Subsea Technology Issues being addressed by MCS Dr Patrick O’Brien, Director, MCS. 11th May 2005. An ISO 9000 Company. Presentation Overview. Fatigue of Flexible Pipe and Steel Tube Umbilical Risers

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Current Riser & Subsea Technology Issues being addressed by MCS

Dr Patrick O’Brien, Director, MCS

11th May 2005

An ISO 9000 Company

presentation overview
Presentation Overview
  • Fatigue of Flexible Pipe and Steel Tube Umbilical Risers
    • Progress on recent development work
    • Upcoming STU Prototype Testing
  • Subsea Integrity Management
    • The SCRIM Joint Industry Project
  • Deepwater Pipelay analysis
  • MCS Pleased to Sponsor the Technical Seminar Programme for Subsea Solutions 06
    • Importance of Paris as a hub for West of Africa business by our recent opening of an MCS Paris office
flexible pipes and steel tube umbilicals
Flexible Pipes and Steel Tube Umbilicals

Flexible Pipe

Integrated Production Bundle

Steel Tube Umbilical

flexible pipes and steel tube umbilicals1
Flexible Pipes and Steel Tube Umbilicals
  • All an integral part of the SURF scope of supply
  • All include helically wound components
  • Friction between layers or helically wound components
  • Need to model behaviour of helically wound components on a bent pipeline or umbilical
  • Fatigue Design important for Risers

Flexible Pipe

Steel Tube Umbilical

integrated local global modelling
Integrated Local-Global Modelling
  • Stick-Slip Bending
    • Armour / tube initially sticks on reverse bending
    • Slip is inline with and transverse to lay-direction
    • Hysteretic fatigue stress

Regular Stress Cycle

flexible pipe and stu fatigue design
Flexible Pipe and STU Fatigue Design
  • MCS managed programmes
    • Real Life JIP
      • Emphasis on global analysis
      • Interface between global and local pipe loads
    • DTI – Fatigue Analysis Tool for Flexible Pipes
      • Specifically established to embody methodologies recommended by Real Life JIP
      • Focus on local pipe stress analysis
        • Tensile armours
        • Pressure armours
    • Fatigue Life Testing of Steel Tube Umbilicals
      • Jointly between MCS and COPPE
      • Testing of manufacturer prototypes and model calibration
wire or tube equations of equilibrium helically wound components
Wire or Tube Equations of EquilibriumHelically Wound Components



Surface Normal




  • Method of Solution
    • Incremental curvature determines incremental non-slip axial stress
    • Incremental non-slip axial stress determines incremental tangential shear, normal interface and tranverse shear stresses
    • Check Coulomb law and gradually relax stresses while retaining equilibrium
    • Wire curvatures from loxidromic / geodesic equations
friction induced stress
Friction-Induced Stress
  • MCS Structural Model for Friction – Irregular Loading
tensile armour stress validation
Tensile Armour Stress Validation
  • MCS stress computed almost instantaneously from global loads
fatigue analysis highlights
Fatigue Analysis Highlights
  • Closely integrated with global analysis
    • Takes timetraces directly from the global analysis
      • Tensions & component curvatures
      • Regular or irregular responses
    • Computes stress timetraces that are cycle (rainflow) counted
  • Local analysis supports 3D bending of pipe / umbilical
    • Fully accounts for global directionality
    • Wire stress computed at several locations
    • Economically processes several loadcases
  • Validated as part of the Real Life JIP
  • Hysteresis effects applied to reduce conservatism
    • In either a semi-local or global analysis
hysteresis global modelling
Hysteresis: Global Modelling
  • Global modelling only takes the “plastic” slope
  • Improves fatigue life by factors of over 5
steel tube umbilical x section analysis
Steel Tube Umbilical X-Section Analysis
  • Similar Issues to Flexible Pipe Technology
    • Helically Wound Components (Tubes/Armour Wires)
    • Slip / No-Slip of Tubes
    • Hysteresis Effects
    • Complex 3D Global Motions / Loads
    • Friction Issues
    • Identical approach to global fatigue analysis
steel tube umbilicals
Steel Tube Umbilicals
  • Some Key Differences to Flexible Pipe Technology
    • Much Smaller Lay Angles (2º to 10º)
    • More Complex and varied Cross-Sections
    • Complex Contact Pressure Scenarios
    • More Prone to Disorientation
mcs stu technology development
MCS STU Technology Development
  • Research Project – Fatigue Life Testing of Steel Tube Umbilicals
  • Joint Project between MCS and COPPE
    • COPPE - Graduate School and Research Institute from the Federal University of Rio de Janeiro
  • Funding by Petrobras and Brazilian Government
  • STU Samples from Marine Production Systems (Oceaneering Multiflex) and Prysmian (Pirelli)
coppe test rig
COPPE Test Rig
  • Bosch-Rexroth Hydraulic System
  • Tension Capacity of 225 ton
  • Max Bending Moment of 200 ton.m
  • Angle Range from -15° to +30°
  • Sample maximum length of 12m
  • Variable Tension Loads
  • In or Out of Phase Load Combinations
  • Full Instrumentation
  • Continuous Monitoring
summary of stu research project
Summary of STU Research Project
  • Full Scale Dynamic Test of Two Samples
    • Using COPPE’s test rig in Rio
  • Global and Local Numerical Modelling of STUs
  • Calibrate MCS Cross-Section Models against Test Results
  • Preliminary Guidelines for Fatigue Analysis of STUs
summary of stu research project cont
Summary of STU Research Project (cont.)
  • Project Schedule
    • 12 month schedule
    • May ’06 to April ‘07
  • Deliverables
    • Qualify Two STU Designs
    • Gather Full Scale Test Data
    • Calibrate Models
    • Preliminary Guidelines
subsea integrity management
Subsea Integrity Management
  • Integrity management for subsea components evermore important
    • Deep water, remote locations: cost of intervention
    • High profile failure incidents around the world (Brazil, GOM)
    • Gulf of Mexico
      • Hurricane conditions in excess of 1000 year event
      • Accelerated growth in use of Steel Catenary Risers (SCRs) combined with uncertainty in design of SCRs
      • Regulator framework for riser CVA from the MMS
      • All leading to an increased focus on safety and integrity
scr integrity management scrim jip
SCR Integrity Management (SCRIM) JIP
  • Primary objectives of the SCRIM JIP have been:
    • to develop a systematic methodology for the risk-based integrity management of SCR field systems.
    • to investigate best technology in terms of inspection and monitoring methods for SCRs, and identify emerging technologies for SCR inspection and monitoring.
scrim jip participant status


  • BP (Steering Committee Chair)
  • ExxonMobil
  • ChevronTexaco
  • Petrobras
  • Kerr McGee
  • Anadarko
  • Dominion
  • BHP Billiton

Transportation Companies

  • Williams


  • SBM


  • Minerals Management Service
  • Department of Transportation

Component Suppliers

  • Oil States Industries
  • RTI Energy Systems
  • Techlam

Pipe Mill

  • Tenaris



Deepwater Pipeline Installation Analysis

rollerbox modelling options
Rollerbox Modelling Options
  • Range of options provided
  • Simplest can be used in preliminary studies – extremely fast
  • Most complex combines realistic model with fast solutions times
  • Deep and shallow water pipeline installation analysis
  • Start-up procedures:
    • Sheave
    • Stab and hinge over
    • Dead man anchor
  • Abandonment & Recovery
  • In-line structure
  • SCR transfer
  • And more …
  • Leading Edge Fatigue Methodology for Flexible Pipe and Steel Stube Umilical Risers
    • Globally integrated stress methodology
    • Much improved interface between global and local analyses
    • Numerically efficient
    • Generic equations to solve helically wound elements
    • Ongoing full scale tests to validate and calibrate methodologies
  • Subsea Integrity Mangement
    • Industry iniative to develop methods for SCR integrity management
  • Pipelay analysis
    • A new generation tool for dynamic pipelay analysis

The End