Jeff Green DDCF Presentation

8/7/2019 Jeff Green DDCF Presentation

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Ship/Lighter/Platform

Fendering

Problem

Deep Draft Composite Fender

Testing

FY03 Plan


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Existing Fenders

32 x 50 foam filled sausage fenders

Deployed along the waterline of ship


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Problem

Existing fenders not Sea State 3 capable

Fender failure

Interface issues due to differentlighterage configurations


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Deep Draft Composite

Fender

High-strength composite construction

Configured for use with wide range of lighters

Provides 6-foot standoff

Provides low pressure on hull of ship

Deep draft / high inertia stability features

Unsinkable construction

Highway transportable

Design Features


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Fender

s

Fender units

Composite box


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Fender

Composite box

Fender units

Cushions


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Composite box


Fender

Fender units

Cushions Foam flotation blocks


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Composite box

Weight Tray


Fender

Fender units



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Composite box

Weight Tray

Spreader Bar


Fender

Fender units



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Fender

Principal

Characteristics,

Transport &

Stowed

Length....38

Width....6Height...8

Weight12.3 LT


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Fender

Principal

Characteristics,

Deployed

Length...17

Width...6

Height18

Draft...13

Weight..15 LT


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Deployment


Fender


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Lift from stowed position by crane using

spreader bar


Fender


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Fender

Lower into water, fenders flood and move

into deployed position


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Fender

Spreader bar lowered onto top of fender,

securing units together by fitting into slots


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Fender

Mooring

4 taglines used for deployment & mooring

Water

Line


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Fender

Testing Practiced Handling & Deployment

Nov-Dec 02 onboard SS Flickertail State

HSV-X1 Joint Venture Demonstration


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Fender


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Fender

Lessons Learned: The Good

Lifting and moving fenders

Relatively fast deployment in calm seas

Good stability when deployed

Mooring system allows precise positioning

Easy retrieval and stowage


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Lessons Learned: The Bad


Fender

Mooring points deemed undersized

Inexperience with deployment procedurescan be a problem


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Lessons Learned: The Ugly


Fender

Deployment would be

very difficult in higher

sea states

Spreader bar poses

hazard to ships

Spreader barpassively locks

fender in place,

active lock is desired


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Project Plan

DDCF modifications (Feb-Mar)

Deployment Method

At-Sea testing (Apr)

Post test analysis (May-June)

Mooring Points


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MPF study (Feb-May)

Project Plan

Stowage

Mooring

Hull interface


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DDCF redesign (June-Aug)

Incorporate lessons learned & test results

MPF study results

Optimize design for cost & weight

Transition to procurement

Project Plan

Jeff Green DDCF Presentation

Documents