WHAT IS LIFTBOAT???
A liftboat, not to be stressed with a traditional jack up drilling rig, is defined as a self-raising, self-propelled vessel geared up with as a minimum one crane and with an open deck area that can be used for more than one functions.
Liftboats are the trucks of the offshore fleet. They bring any type of device essential to do whatever the activity calls for.
Liftboat jobs encompass wireline, crane operations, pipe-laying, diver guide structures, work over and offshore coiled tubing operations, temporary housing for construction and carrier crews, wind turbine installation and liftboat for oil & gas maintenance, and so on. The list of makes use of may be confined simplest through the imaginative and prescient of the operators and demands of the market. Worldwide, the fleet consists of some 175 vessels of diverse sizes and competencies.
Looking on the liftboat, there are sure key elements to cognizance on
(1) Legs and pads
(2) Jacking System
(3) Working Water Depth
(4) Open Deck Area
(5) Net Deck Load
(6) Crane Capacity
(7) Personnel Accommodations
(9) Classification Considerations.
The significant majority of liftboats are three-legged. The 4-legged liftboat will fee greater than the value of genuinely adding the fee of any other leg, i.e., the jacking system to aid two legs loaded diagonally is extra and the hull structure is unique/heavier. But operationally, the setup time savings of a 4-legged equates to cash, so, one has to weigh the costs and advantages of 3 vs. four legs.
The jacking system for a liftboat is very specific than the jacking device for a jack-up drilling rig. The predominant differences center around pace and cycles.
Working Water Depth
A region with mild environmental conditions vs. harsh environmental conditions could be an appreciably specific liftboat layout in all factors, i.e., legs, jacking device and hull.
The deck area is the unobstructed, open place. The liftboat crane is used to transport system and substances around and on to and stale the platform/offshore location. There is a dating among those variables – open deck region, internet deck load and crane ability. Further, you need a crane capability this is commensurate with the expected deck hundreds and region.
The internet deck load for a liftboat is what you have got for your deck in transit and may then jack up with at the deck. Consumables (consisting of water, gas, hydraulic fluid, and so forth.) are similar to the net deck load.
There is an exact courting amongst deck area, deck load and crane ability. Liftboats are designed as multi-reason vessels.
Types of liftboat cranes, there are lattice growth, field boom, telescopic growth, pedestal mounted, and leg encircling cranes. The most important matters to remember in crane selection is attained, load capacities and effect on deck area.
The inns are every other characteristic of liftboats. The personnel accommodations are usually divided into two areas – navigation group and consumer/operational employees.
The form of process that the liftboat is performing will dictate the lodging requirement, i.E., an offshore creation task could normally require extra employees than a properly intervention task. The production process may also even require additional modular living quarters on the deck.
A preferred and key feature of a liftboat is that it is self-propelled. This alleviates the need for tugs to transport the liftboat or to installation on the region. The liftboat can anticipate a weather window and move. The large liftboats have integrated propulsion and bow thrusters.
Most of the principal Classification Societies do no longer elegance liftboats that is taken into consideration a requirement for worldwide operations.
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