WG 8: ISO 19906, ARCTIC OFFSHORE STRUCTURES STANDARD TP9 Ice - - PowerPoint PPT Presentation

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WG 8: ISO 19906, ARCTIC OFFSHORE STRUCTURES STANDARD TP9 Ice - - PowerPoint PPT Presentation

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WG 8: ISO 19906, ARCTIC OFFSHORE STRUCTURES STANDARD TP9 Ice Engineering Summary SNAME April 16, 2008 Dan Masterson, TP9 Vice-Chair ISO/CD 19906 ISO 19906 WG8 Technical Panels TP 0 editorial TP 1 Environment TP 2

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ISO/CD 19906

WG 8: ISO 19906, ARCTIC OFFSHORE STRUCTURES STANDARD TP9 Ice Engineering Summary

SNAME – April 16, 2008 Dan Masterson, TP9 Vice-Chair

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ISO/CD 19906

ISO 19906 WG8 Technical Panels

TP 0 – editorial TP 1 – Environment TP 2 – Action/Loading/Reliability TP 2a – Reliability TP 2b – Ice Action(Loads) TP 2c – Waves/Met Ocean TP 2d – Seismic TP 2e – Wave Actions(Loads)

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ISO/CD 19906

ISO 19906 WG8–

TP 3 – Foundations TP 4 – Artificial Islands TP 5 – Steel Structures TP 6 – Concrete Structures TP 7 – Floating Systems TP 8a – Facilities and Topsides TP 8b – Facilities EER TP 9 – Ice Engineering

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ISO/CD 19906

ISO 19906 – Key dates

CD – November 2007 Committee Draft – national expert review DIS – October 2008 Draft International Standard – public comment FDIS – December 2009 Final Draft IS - vote IS – April 2010 International Standard

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ISO/CD 19906

WG 8 / Technical Panel TP9

Sveinung Loset – Chair - NTU Dan Masterson – Vice Chair - Chevron George Comfort – Fleet Technology Karl Ulrich-Evers - HSVA Andrew Palmer - Professor Richard McKenna - Consultant Igor Stepanov – AARI Gennady Surkov - Sakhalin Oil & Gas Inst. Gary Sonnichsen – Pet. Res. Atlantic Canada Musabaev Askar – SA PA Kazakhstan

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ISO/CD 19906

TP9 – Ice Engineering Meetings:

  • June 20, 2004, St. Petersburg (IAHR)
  • October 20-23, 2004 London
  • June 30+July 1, 2005, Potsdam (POAC)
  • July 4-9, 2005, Calgary
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ISO/CD 19906

TP9 16.0 Ice Engineering

16.6 Offloading in ice 16.5 Ice tank and small-scale modelling 16.4 Measurements of ice pressure and actions 16.3 Ice as a protection barrier 16.2 Ice islands 16.1 Ice roads and supplies over ice Clause

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ISO/CD 19906

TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice

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ISO/CD 19906

TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice

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ISO/CD 19906

TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice

750 ton rig

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ISO/CD 19906

TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice A.16.1.3 Ice flexural strength for design A.16.1.4 Dynamic behaviour and dynamic amplification factor A.16.1.5 Safe use of ice roads and standard procedures A.16.1.6 Grounded ice roads

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ISO/CD 19906

TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice A.16.1.2 Floating ice design criteria

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ISO/CD 19906

TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice

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ISO/CD 19906

TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice P = A⋅h^2 where: – P is the ice sheet strength, in tonnes; – A is the coefficient for ice road operation, in tonnes/m2, in the range 343 t/m2 ≤ A ≤ 686 t/m2; – h is the ice thickness, in m.

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ISO/CD 19906

TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice

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ISO/CD 19906

TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice

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ISO/CD 19906

TP9 – Ice Engineering

A.16.2 Artificial ice islands A.16.2.1 Grounded ice islands

Mars ice island – approx 300 m square

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ISO/CD 19906

TP9 – Ice Engineering

A.16.2 Artificial ice islands A.16.2.1 Grounded ice islands

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ISO/CD 19906

TP9 – Ice Engineering

A.16.2 Artificial ice islands A.16.2.1 Grounded ice islands A.16.2.1.2 Construction A.16.2.1.3 Material properties of the ice Material properties of spray ice below waterline Spray ice properties above waterline Ice and soil interface A.16.2.1.4 Lateral stability against ice action

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ISO/CD 19906

TP9 – Ice Engineering A.16.2 Artificial ice islands

A.16.2.1.5 Load-bearing capacity Below water capacity Above water capacity Above water capacity A.16.2.1.6 Thermal considerations at the well Construction QC and monitoring Post construction verification Monitoring during drilling

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ISO/CD 19906

TP9 – Ice Engineering Thermal considerations at the well

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ISO/CD 19906

TP9 – Ice Engineering

A.16.2.2 Floating ice islands

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ISO/CD 19906

TP9 – Ice Engineering

A.16.2.2 Floating ice islands A.16.2.2.2 Construction A.16.2.2.3 Design for short-term and long-term load- bearing capacity Step 1: Stress design Step 2: Long-term deflection design A.16.2.2.4 Thermal design A.16.2.2.5 Monitoring during construction and drilling

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ISO/CD 19906

TP9 – Ice Engineering

A.16.4 Measurements of ice pressure and actions A.16.4.2 Measurement techniques A.16.4.3 Limitations and requirements for different techniques A.16.4.4 Documentation of environmental conditions A.16.4.5 Observations of the ice-structure interaction process A.16.4.6 Ice load data bases and synopses

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ISO/CD 19906

TP9 – Ice Engineering

A.16.3 Protection barriers

CIDS (Orlan) Tarsiut

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ISO/CD 19906

TP9 – Ice Engineering

A.16.3 Protection barriers A.16.3.2 Ice protection structure A.16.3.2.1 Grounded ice as a protection barrier A.16.3.2.2 Rubble generation A.16.3.2.3 Ice barriers A.16.3.2.4 Ice actions and ice/barrier interaction A.16.3.3 Methods for mitigation the effects of ice A.16.3.3.1 Ice control and defense A.16.3.3.2 Mitigation of ice encroachment

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ISO/CD 19906

TP9 – Ice Engineering

A.16.5 Ice tank modeling A.16.5.2 Scaling A.16.5.3 Test methods Model ice types Testing technique options Ice conditions A.16.5.4 Model ice properties Flexural strength and modulus of elasticity Friction coefficient

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ISO/CD 19906

TP9 – Ice Engineering

A.16.5 Ice tank modeling

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ISO/CD 19906

TP9 – Ice Engineering

A.16.6 Offloading in ice

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ISO/CD 19906

TP9 – Ice Engineering

A.16.6 Offloading in ice A.16.6.2 System reliability A.16.6.3 Requirements for the offloading terminal Platform Tower Single anchor loading Turret A.16.6.4 Requirements for the tanker

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ISO/CD 19906

TP7 Floaters

Richard McKenna (TP7 co-leader) for Costas Makrygiannis (TP7 leader)

Moscow, November 2007

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ISO/CD 19906

TP7 Scope & Philosophy

  • Clause 13, Floating Structures

– Incremental from ISO 19904-1 for ice actions and consideration of cold weather issues

  • Clause 14, Subsea Installations

– Unique since no existing standard dealing with ice actions for subsea – Pipelines are not within the scope of WG8 and are not dealt with in ISO 19906

  • Clause 17, Ice Management

– Unique since no existing standard dealing with ice management

  • Principles

– Provide good guidance – Avoid prescription, allowing flexibility for designer to consider new concepts – Ensure safety

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ISO/CD 19906

TP7 Members

  • Norm Allyn - Westmar
  • Phil Clark – Petro Canada
  • Rick Grant - Consultant
  • Wim Jolles – AGIP KCO
  • Costas Makrygiannis - BP
  • Richard McKenna - consultant
  • Tore Sildnes - DnV
  • George Wang - ABS
  • Brian Wright - BWA
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ISO/CD 19906

Clause 13 – Floating Structures

  • Relies on ice management and disconnection to
  • perate safely

– Additional requirements for mechanical systems and operational procedures

  • Types of structures

– Buoy type, spar, ship shape, TLP – Jack-up (many floaters ice provisions apply, but these are not covered in ISO 19904-1)

  • Systems considered

– Hull strength and stability – Stationkeeping system, disconnection, reconnection – Mechanical systems – maneuvering and propulsion

  • Special issues

– Requirement for ice management system – Monitor ice actions and offsets

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ISO/CD 19906 Turret Risers Mooring Lines

Clause 13 – Floating Structures

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ISO/CD 19906

Clause 14 – Subsea Installations

  • Based largely on experience at Terra Nova and White

Rose on Grand Banks

  • Deals with

– Flowlines and umbilicals – Templates, wellheads and manifolds – Protection structures

  • glory holes, rock berms, structures
  • Approach for subsea design

– Assess whether ice design is required – Operational procedures and design can be used to mitigate risk

  • Ice management, flushing of lines, downhole safety valves
  • Ice actions often involve seabed interactions
  • gouging ice features
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ISO/CD 19906

Clause 17 – Ice Management

  • Based on experience in

– Beaufort Sea (sea ice) – Labrador, Grand Banks and West Greenland (icebergs) – Sakhalin (sea ice) – NE Caspian Sea (sea ice)

  • Aspects dealt with in ISO 19906

– Management involves ice detection, assessment, response procedures – Design of management system – Operational considerations to ensure ice management success

  • TP7 recommends the expansion of ice

management annex A17 for DIS

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ISO/CD 19906

Clause 17 – Ice Management

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ISO/CD 19906

Clause 17 – Ice Management