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The following tasks should be performed for the structure removal:
Furthermore, A SACS model should be developed for the platform to be removed. The strength of the platform framing and joints and the new rigging members and supports should be verified by running lift, back loading, and transportation analyses using SACS models. Joint can punching shear check should be performed based on API RP 2A guidelines for all the existing and the new tubular connections.
Members that are corroded and or damaged to the extent non-useable for structural strength should not be included in the structural analyses unless it is shown absence of this member will result in overstressing many other members and joints. Such member then should be strengthened to its full capacity by cleaning, welding plates, clamps etc. to fit the situation.
The constructability issues related to lifting and back loading of the salvaged structures and miscellaneous components should be considered in the design.
Measures to mitigate the potential hazard of dropped objects should be considered in the design and analysis.
Add on: Two legs of the jacket are assumed to be supported by two cradle type supports pre-installed on a material barge that allows the jacket to rotate for lying sideways. It will be necessary to install a winch on the material barge to pull the jacket from the top to perform this operation. Alternative methods for rotating and resting the jacket on its side may be implemented when supported by engineering analyses and past experiences in performing similar tasks.
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