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Jacket Miscellaneous Design
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1/8/2015 11. Jacket miscellaneous structure design Design of structural parts for the stand | Offshore.VN | Forum Engineers Coastal Engineering
http://offshorevn.com/showthread.php?4657 1/6
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Forum Southern Association of CTB Action Workshop on Science and Technology
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020813, 05:09 AM
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11. Jacket miscellaneous structure design Design of structural parts for the base
For the base structure, the key element is often called (primary) is the model in software, thecalculation analysis and design software will largely due to, for the structural parts (secondary) can not modeling software, design staff has the tools tocalculate replacement or Mathcad and Excel as an example, in the calculation of this problem willbe independent spreadsheet as directed by the standard formula available. hence the differentstandards are applied, the output will differ slightly. The problem / file properties of this type typically includes: 1. Jacket Upending Padeye / Trunnion 2. Pulling Jacket slug 3. Mooring bollards Design 4. Walkway Design 5. Buoyancy Tank 6. X Ring stiffener brace 7. Launch Cradle Design 8. Design stabbing guide 9. Pile Jacket Connection to 10. Hydrostatic Collapse Check 11. Riser Clamp Design 12. Crown Design Shim 13. Docking guide & Jacket Integrity Check 14. Conductor Setting Depth 15. Conductor Hanging Check 16. Vortex Induced Vibration 17. Wave Design slamming 18. Skirt pile connection 19. Mudmat check 20. Anode protector Topic hopes to introduce through the ACE for each problem / file properties including theoreticalfoundations and illustrations
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Continue the detailed description of each problem, starting from: 3. Mooring bollards DesiginhPhotos fact: http://offshorevn.com/showthread.php...dBichneotau Theoretical basis:
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1/8/2015 11. Jacket miscellaneous structure design Design of structural parts for the stand | Offshore.VN | Forum Engineers Coastal Engineering
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9. Pile Jacket Connection to the actual images: http://offshorevn.com/showthread.php...lateandCrownReference: http://offshorevn.com/showthread.php...nhanh entityte theoretical basis:
Figure 1: Photo realistic and detailed drawings Figure 2: Welds and power analysis
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1/8/2015 11. Jacket miscellaneous structure design Design of structural parts for the stand | Offshore.VN | Forum Engineers Coastal Engineering
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20. Anode protectorPhoto illustration:
Figure 1: Details Anode
3.0 DESIGN CRITERIA AND DATAi) Calculation cathodic Protection Design based on DNVRPB401 (January 2005). ii) Life Design Platform Designed for WHP platform is a design life of 20 years. iii) Splash Zone Splash Zone extends from elevation ( ) 5.0 to (+) 5.0 m with reference to MSL. iv) Current Density Design for Corrosion Protection Acceptance CRITERIA 3.1 Calculation ofrequired number of anodes shall is Satisfy three [3] criteria: • Number of anodes requiredinitially to polarize the jacket. • Number of anodes required to cung the current maintenancethroughout the design life. • Number of anodes required to cung adequate protection on the finalday of design life. 3.2 SURFACE AREA Calculation All members exposed to sea water structurebelow the splash zone, embedded piles and conductors, Will Be Against protected by cathodiccorrosion protection system using Sacrificial anodes. The substructure surface calculation whichareas shall is như to as follows: Above the mudline, the surface area calculation includes theexternal surface area of all members and steel jacket appurtenances như conductors , fender,etc. boatlanding below MSL. Internal Surfaces area of the jacket legs Shall be excluded fromthe surface area calculation. Below the mudline, the external surface area of the embeddedpiles and conductors shall is be included in the surface area calculation up to 30m and 15m,respectively. A Considered contingency of 10% was on the surface area calculation. 3.3 anodeDISTRIBUTION The distribution of anodes shall is to be distributed cung a uniform currentdistribution, considering current demand of each member. Anodes shall is where thể be Positionedon primary diagonal and horizontal Bracing and away from complex joints. The anodes Shall bedistributed in a manner than form a symmetrical arrangement mà They are covering all thestructural and surface which areas. The spacing shall is be 500 mm or more in order to tránhinterference shielding effect and the between each anode. No carbon anodes shall is be locatedcloser than 600 mm to the jacket's nodes.
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8. stabbing guide DesignTheoretical Foundations All stabbedin guides and installation aids Shall Be Designed for sau loads as minimum: 1. Horizontal loads = 10% of the static weight of the lift object 2. Vertical impact force = 10% of the static weight of the lift object An Increase in Allowable stresses third one is phép. Illustrations
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