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A jackup rig is a barge fitted with long support legs that can be raised or lowered. The jackup is maneuvered (self-propelled or by towing) into location with its legs up and the hull floating on the water. Upon arrival at the work location, the legs are jacked down onto the seafloor.
A number of very large crane vessels were built in the 1970s which allow very large single modules weighing up to 14,000 tonnes to be fabricated and then lifted into place. [ citation needed ] Specialist floating hotel vessels known as flotels or accommodation rigs are used to accommodate workers during the construction and hook-up phases.
Jack-Up Barge – used in the Gulf-of-Mexico prior to USCG regulation as a marine vessel; Jack-Up - used by UK Renewable (ex. BWEA) but are not necessarily self-propelled; Wind-Farm Installation Vessel – used generally in the renewables industry but are not necessarily self-propelled
These include bottom founded drilling rigs (jackup barges and swamp barges), combined drilling and production facilities either bottom founded or floating platforms, and deepwater mobile offshore drilling units (MODU) including semi-submersibles or drillships. These are capable of operating in water depths up to 3,000 metres (9,800 ft).
Rack Phase Difference (RPD) is a difference in the elevation between rack teeth of the chords of any single leg of a jackup rig with open truss-type legs.This type of jackup vessel operates with a rack and pinion drive system, as opposed to the pin-hole system found on jackups rigs with tubular legs.
With drilling moving into ever deeper waters, Jack-up barges could not be used any more, and anchoring in deep water was not economical. As part of Project Mohole, in 1961 the drillship Cuss 1 was fitted with four steerable propellers. The Mohole project was attempting to drill to the Moho, which required a solution for deep water drilling.
A Jack-up construction barge is a barge fitted with four to eight legs, each with a jacking system that can grip the leg and move it up or down relative to the hull, lock it in place and move back along the leg to grip it again for a further jacking operation.
Barge outfitted with Cranes is towed into position. Marine construction is the process of building structures in or adjacent to large bodies of water, usually the sea. These structures can be built for a variety of purposes, including transportation, energy production, and recreation.