Jumboisation is a technique in shipbuilding

Shipbuilding

Shipbuilding is the construction of ships and floating vessels. It normally takes place in a specialized facility known as a shipyard. Shipbuilders, also called shipwrights, follow a specialized occupation that traces its roots to before recorded history.Shipbuilding and ship repairs, both...

 consisting of enlarging a ship

Ship

Since the end of the age of sail a ship has been any large buoyant marine vessel. Ships are generally distinguished from boats based on size and cargo or passenger capacity. Ships are used on lakes, seas, and rivers for a variety of activities, such as the transport of people or goods, fishing,...

 by adding an entire section to it. By contrast with refitting or installation of equipment, jumboisation is a long and complex endeavour which can require a specialised shipyard

Shipyard

Shipyards and dockyards are places which repair and build ships. These can be yachts, military vessels, cruise liners or other cargo or passenger ships. Dockyards are sometimes more associated with maintenance and basing activities than shipyards, which are sometimes associated more with initial...

.

Enlarging a ship by jumboisation allows an increase in its value without needing to purchase or build an entirely new ship. This technique has been used on cruise ship

Cruise ship

A cruise ship or cruise liner is a passenger ship used for pleasure voyages, where the voyage itself and the ship's amenities are part of the experience, as well as the different destinations along the way...

s and tanker

Tanker

- Transportation :* Tanker , a ship designed to carry bulk liquids** Chemical tanker, a type of tanker designed to transport chemicals in bulk** Oil tanker, also known as a petroleum tanker...

s, as well as smaller vessels like sailing or fishing ships.

Methods

Large ships often have a long mid-section with a uniform profile. In such cases, the ship is cut in two pieces and an additional section is inserted in between. This operation must be performed in a drydock.

On large ships, the additional sections are typically 20 to 30 metres long, consisting of an oil tank, a cargo ship hold, or a group of cabin

Cabin (ship)

A cabin or berthing is an enclosed space generally on a ship or an aircraft. A cabin which protrudes above the level of a ship's deck may be referred to as a "deckhouse."-Sailing ships:...

s, depending on the type of ship. The tanker Seawise Giant became the largest ship in the world after her jumboisation.

Smaller ships are usually jumboised by replacing the entire bow

Bow (ship)

The bow is a nautical term that refers to the forward part of the hull of a ship or boat, the point that is most forward when the vessel is underway. Both of the adjectives fore and forward mean towards the bow...

 or stern

Stern

The stern is the rear or aft-most part of a ship or boat, technically defined as the area built up over the sternpost, extending upwards from the counter rail to the taffrail. The stern lies opposite of the bow, the foremost part of a ship. Originally, the term only referred to the aft port section...

section of the ship. This is done because the shape of their hull is usually incompatible with the previous method.

External links

• Jumboisation/Body Swapping at Keppel Shipyard