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Deep Draft Composite Fender Lessons Learned

Carderock. Deep Draft Composite Fender Lessons Learned. Jeff Green NSWCCD 2-9-05. Carderock. Problem. Existing ship-to-lighter fenders not SS3 capable Failures Interface issues due to different lighter shapes & sizes. Carderock. Carderock. Project Goals. Develop new fender concept

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Deep Draft Composite Fender Lessons Learned

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  1. Carderock Deep Draft Composite FenderLessons Learned Jeff Green NSWCCD 2-9-05

  2. Carderock Problem • Existing ship-to-lighter fenders not SS3 capable • Failures • Interface issues due to different lighter shapes & sizes

  3. Carderock

  4. Carderock Project Goals • Develop new fender concept • Work with all current lighters • Improved capacity • Low maintenance • SS3 deployment & operation

  5. Carderock Design Requirements • Compatible with common JLOTS ships, lighters, and platforms • Transportable, ISO compatible • Deployment & recovery with common lift equipment • Sufficient standoff

  6. Carderock Deep Draft Composite Fender Principal Characteristics, Transport & Stowed Length…...….38’ Width…..……..6’ Height…….…..8’ Weight…12.3 LT

  7. Carderock Deep Draft Composite Fender Principal Characteristics, Deployed Length…..….17’ Width….……..6’ Height………18’ Draft………...13’ Weight…..15 LT

  8. Carderock Testing • Fall ‘02 • Handling & deployment • HSV X-1 Joint Venture

  9. Carderock Testing video

  10. Carderock Testing

  11. Carderock Results • Deployment & mooring methods unsatisfactory • Difficult deployment • Mooring line rigging • Spreader bar

  12. Carderock Design Changes • New lifting, securing, & mooring system

  13. Carderock Testing • Fall ‘03 • At-Sea test • LCU-2000, LCM-8

  14. Carderock Testing

  15. Carderock Testing

  16. Carderock Results • Mooring method successful • Deployment time consuming but acceptable • Interface w/lighters successful • Locking mechanism damaged

  17. Carderock Design Changes • Improved locking system

  18. Carderock Testing • Spring ‘04 • At-Sea test at JLOTS 04 in Honduras

  19. Carderock Testing

  20. Carderock Testing

  21. Carderock Testing • Video

  22. Carderock Results • Sea state problems • Erratic motions in SS3 • Personnel transfer complicated • 6’ standoff

  23. Carderock Were Goals Met? • Work with all current lighters? • Tested with LCU-2000, LCM-9, NL CWF • Rub rails • CWF bolts & corners • Improved capacity? • Cushion elements sufficiently sized

  24. Carderock Were Goals Met? • Low maintenance? • No corrosion problems • Localized composite & cushion damage • Missing bolts • SS3 operation? • Erratic motions • Related mooring issue

  25. Carderock Were Goals Met? • Transportable? • Transported by truck & ship • Handled with forklifts, cranes • ISO compatible? • Fit ISO 8x8x40 size

  26. Carderock Were Goals Met? • Deployment & recovery with common lift equipment? • Cargo crane & standard lifting gear • Sufficient standoff? • ~6 out of 8 ain’t bad, but room for improvement

  27. Carderock Improvements & Future Considerations • Motions • Restraints • Design • Cushion height • Composite protection • Cushion resilience

  28. Carderock Key Lessons Learned • Reconsider requirements • Ship mods • SS3 deployment & recovery • Early user input

  29. Carderock Questions?

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