overview of jacket installations

8/17/2019 Overview of Jacket Installations

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Jacket Installation Methods – Oil & Gas Trainings

by Dr. Tofiqu Zaveri

www.globalenergypanel.com


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JACKET INSTALLATION

• JACKET INSTALLATION

– Vertical lift and set down

– Two block upend in air/ water

– launch

– Lift and upend in water


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Vertical lift and set down

•Offshore time saving


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Two Block upend in air/ water


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Two Block upend in air/ water


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Launch

•Connected to the stern anchors of the DB

•Pre rigged with the upending slings


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Lift and upend

•

Load out• Transport

• Barge Alongside

• Rig the main Block for Horizontal Lift

• Cut Sea Fastening

• Lift the jacket and move the material barge

• Lower jacket to water

• Rotate the jacket

• Rig the main block to upending slings

• Upend the jacket and set down• Piling


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Load out

•Horizontal loadout

•

Strand jack pull with crane assistance


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Transportation

•Tow Analysis: barge motion, transportation force, tug

pull , sea fastening analysis


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Barge Alongside


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Rig Main Block

•Rigging analysis


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Cut Sea-Fastening


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Lift Jacket and Move Material barge


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Lower Jacket into Water

•Buoyant ( Closure plate welded at the top and diaphragm at the bottom)


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Rotate the Jacket

•Rotate with tuggers, minimum clearance frm DB


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Rig Main/ auxiliary block to Upending Slings

•

Riggers transferred to jacket( boat/ man riding basket)•Main block derigged

•Main block rigged with upending slings

•Riggers are transferred back to DB


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Upend jacket and Set Down

•Lower jacket to 3m above sea bed

•Survey the location / orientation

•Rotate if required with the tuggers

•Lower to sea bed and check location again

•Flood the buoyant legs

•Upending slings are derigged


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Disclaimer

The information contained in these course/notes has been compiled from various sources and is

believed to be reliable and to represent the best current knowledge and opinion relative to the

subject.

Global Energy Panel offers no warranty, guarantee or representation as to its absolute

correctness or sufficiency.

Global Energy Panel has no responsibility in connection therewith; nor should it be assumed

that all acceptable safety and regulatory measures are contained herein, or that other or

additional information may be required under particular or exceptional circumstances.

www.globalenergypanel.com

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