new canadian guidelines for the design of marine structures ...
Transcript of new canadian guidelines for the design of marine structures ...
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NEW CANADIAN GUIDELINES FORTHE DESIGN OF MARINE
STRUCTURES ASSOCIATED WITHLNG FACILITIES
Martin L. Eskijian, P.E., D. [email protected]
Senior Engineer, Moffatt & NicholSeptember 28, 2016
Prevention First, 2016
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Design Requirements for Marine Structures Associated with LNG Facilities (DRMS), EXP 276.1‐2015
• Effort partially funded by the British Columbia Oil and Gas Commission (BCOGC)
• Sponsored by CSA (Canadian Standards Association)
Document is 50 pages, available for free from CSA (need to register)
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Committee Participation DRMS EXP 276.1• BCOGC government• Transport Canada• Prince Rupert Port Authority• Numerous consulting firms • Shell Oil• Exxon/Mobil• CSA Group
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Background and Applicability of EXP276.1 • Initiated with SLC/MFD LNGTEMS
• Document designed to be Canadian
• Enforceable in British Columbia, “recommended practice” for all of Canada
• Applicability – Engineering analysis/design of permanent marine structures providing support for topworks/vessels used to moor/berth LNG tank vessels
.• Does NOT include topworks (e.g. loading arms, fire detection/suppression,
pipelines, etc.)
• Includes Structures:
– Shore‐side abutment– Access trestles from shore to loading platform– Loading platform– Berthing and mooring dolphins– Catwalks– Quay wall structures
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EXP276.1‐2015 Outline
• Scope and Reference Documents• General Requirements• Structural Design of LNG Marine Facilities• Seismic Hazards and Geotechnical Issues• Mooring and Berthing Analyses
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General Requirements CSA 276.1
• Operational/Functional Considerations• Data Acquisition• Design Service Life• Structural Performance Criteria• LNG Vessel Parameters• Berth Layout/Orientation• Design Environmental Conditions and Accidental
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General Requirements
• Applicable Codes/Design Standards• Seismic Criteria• Berth Layout• Design Metocean Parameters• Service Life• Normal and Extreme Operating Conditions
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Structural Design
• Various Design Codes can be used:– CSA S6 – Canadian Highway Bridge Design Code– ISO Standards adopted by Canada for offshore structures
– US Standards (MOTEMS, UFC 4‐152; 4‐159 API RP 2A, ASCE 61‐14)
– European codes in conjunction with BS 6349
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Load Categories
• Dead, Live• Buoyancy• Environmental (wind, wave, current)• Earth and tidal pressures• Mooring/Breasting Loads• Berthing• Earthquake (2 Levels)• Temperature, Construction, Snow/Ice, Tsunami and Process Loads
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Earthquake Loads
• Operating Earthquake (OBE) 10% Probability in 50 years (475 year return period)
Performance Requirement: Remain operational
• Safe Shutdown Earthquake (SSE) 2% Probability in 50 years (2475 year return period)– Performance Requirement: Prevent Collapse, fire protection system to be operational. No release of significant quantities of LNG. ASCE 61‐14 can be used as a conservative approach.
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Load Combinations
• Load combinations and factors developed based on the design selected codes.
• Basic combinations provided in MOTEMS, UFC 4‐152 and BS 6349
• Engineering judgement if references are insufficient.
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Seismic Hazards and Geotechnical Issues
• Site Characteristics and Probabilistic Seismic Hazard Assessment (PSHA)
• Slope, foundation and earth retention systems
• Static and Dynamic Soil Properties• Selection of independent time histories• Liquefaction• Tsunamis
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Mooring and Berthing Analyses
• Normal and Extreme Operating Conditions
• Metocean and operational considerations
• Seiche, Passing Vessel Loads
• Mooring Analysis (static and dynamic)
• Berth Monitoring Systems
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EXP 276.1‐2015
Available to the public through the CSA website (free)
http://shop.csa.ca/en/canada/petroleum‐and‐natural‐gas‐industry‐systems/exp2761‐2015/invt/express27612015
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QUESTIONS/COMMENTS