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 – Action/Loading/Reliability TP 2a – Reliability TP 2b – Ice Action(Loads) TP 2c – Waves/Met Ocean TP 2d – Seismic TP 2e – Wave Actions(Loads) 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 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 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 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 ISO/CD 19906
TP9 16.0 Ice Engineering Clause 16.1 Ice roads and supplies over ice 16.2 Ice islands 16.3 Ice as a protection barrier 16.4 Measurements of ice pressure and actions 16.5 Ice tank and small-scale modelling 16.6 Offloading in ice ISO/CD 19906
TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice ISO/CD 19906
TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice ISO/CD 19906
TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice 750 ton rig 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 ISO/CD 19906
TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice A.16.1.2 Floating ice design criteria ISO/CD 19906
TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice 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. ISO/CD 19906
TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice ISO/CD 19906
TP9 – Ice Engineering A.16.1 Ice roads and supplies over ice 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 ISO/CD 19906
TP9 – Ice Engineering A.16.2 Artificial ice islands A.16.2.1 Grounded ice islands 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 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 ISO/CD 19906
TP9 – Ice Engineering Thermal considerations at the well ISO/CD 19906
TP9 – Ice Engineering A.16.2.2 Floating ice islands 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 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 ISO/CD 19906
TP9 – Ice Engineering A.16.3 Protection barriers Tarsiut CIDS (Orlan) 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 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 ISO/CD 19906
TP9 – Ice Engineering A.16.5 Ice tank modeling ISO/CD 19906
TP9 – Ice Engineering A.16.6 Offloading in ice 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 ISO/CD 19906
TP7 Floaters Richard McKenna (TP7 co-leader) for Costas Makrygiannis (TP7 leader) ISO/CD 19906 Moscow, November 2007
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 ISO/CD 19906 – Ensure safety
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 ISO/CD 19906
Clause 13 – Floating Structures • Relies on ice management and disconnection to operate 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 ISO/CD 19906
Clause 13 – Floating Structures Turret Risers ISO/CD 19906 Mooring Lines
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 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 ISO/CD 19906
Clause 17 – Ice Management ISO/CD 19906
Clause 17 – Ice Management ISO/CD 19906
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