What is jack up vessel?

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.

What is the purpose of a jack up boat?

Liftboats are commonly used to perform maintenance on oil and gas well platforms. The liftboat usually moves on location on a side of the platform where no obstructions or pipelines are observed, lowers its legs and jacks up out of the water.

Is a jack up a MODU?

The jackup-type mobile offshore drilling unit (MODU) has become the premier bottom-founded drilling unit, displacing submersibles and most platform units.

What is a jack up lift boat?

A liftboat is a self elevating, self-propelled vessel equipped with at least one crane and with open deck space that can be used for multiple purposes. A jackup-influenced liftboat design leads to inefficiencies. For example, some 320ft leg liftboats have leg walls up to 2.5-in.

What makes a jackup different from other vessels?

Jackup Definition. Search Results. Jackups are different from most vessels in that they contain things which may move about. In particular, there are legs which can be raised or lowered, cranes which boom in or out and which rotate, and perhaps a cantilever which slides out over a platform.

What is the definition of a jackup rig?

Jackup Rig. Definition – What does Jackup Rig mean? A Jackup Rig, also known as a self-elevating unit, is a mobile unit which contains a buoyant hull that is fitted with various movable legs adept in raising the hull over the sea surface. The buoyant hull allows the transportation of the unit and its machinery to the desired locations.

Why does a jackup rig need a buoyant hull?

The buoyant hull enables transportation of the unit and all attached machinery to a desired location. Once on location the hull is raised to the required elevation above the sea surface supported by the sea bed.

How is a jackup rig anchored to the sea floor?

When the rig reaches the work site, the crew jacks the legs downward through the water and into the sea floor (or onto the sea floor with mat supported jackups). This anchors the rig and holds the hull well above the waves. An early design was the DeLong platform, designed by Leon B. DeLong.