Skandi Neptune

Last updated
Gulf of Mexico Oil Spill (82) (4592120335).jpg
Boa Sub C and Skandi Neptune in April 2010
History
Naval Jack of Norway.svg Norway
Name: MSV Skandi Neptune
Owner: DOF Subsea
Operator: DOF Subsea
Port of registry: Bergen, Norway
Builder:
Yard number: N243 [2]
Completed: November 2000 [2]
Identification:
Status: in service
General characteristics
Class and type: +1A1, E0, DYNPOS AUTR, SF, DK+
Type: Offshore Construction Vessel
Tonnage: 5,090 t  DWT; 6,318  GT [5]
Length: 104 m [4]
Beam: 24 m
Draught: 7 m
Installed power:
  • 2 × 1,530 kW (Wärtsilä 9L20),
  • 2 × 3600 kW (Wärtsila 8L32) [6]
Propulsion: azimuth thrusters and tunnel bow thrusters
Speed: 14.5 / 12.4 knots (max/ave)
Aviation facilities: Helideck

Skandi Neptune is an Offshore Construction Vessel that was operated by Subsea 7 from 2005 until the charter was ended in 2015.

Subsea 7 UK subsea engineering, construction and services company

Subsea 7 S.A. is a subsea engineering, construction and services company serving the offshore energy industry. The company is registered in Luxembourg with its headquarters in London in the United Kingdom.

Contents

History

The Skandi Neptune was built in 2001 as a cable layer. In 2005, she was converted to a multi-purpose offshore support vessel and began a long term charter to Subsea 7. [7] [8]

Cable layer ship type

A cable layer or cable ship is a deep-sea vessel designed and used to lay underwater cables for telecommunications, electric power transmission, or other purposes. Cable ships are distinguished by large cable sheaves for guiding cable over bow or stern or both. Bow sheaves, some very large, were characteristic of all cable ships in the past, but newer ships are tending toward having stern sheaves only, as seen in the photo of CS Cable Innovator at the Port of Astoria on this page. The names of cable ships are often preceded by "C.S." as in CS Long Lines.

In 2010, Skandi Neptune provided ROV capability during the oil spill following an explosion on the Deepwater Horizon in the Gulf of Mexico. [9]

Remotely operated underwater vehicle A tethered underwater mobile device operated by a remote crew

A remotely operated underwater vehicle (ROV) is a tethered underwater mobile device. This meaning is different from remote control vehicles operating on land or in the air. ROVs are unoccupied, highly maneuverable, and operated by a crew either aboard a vessel/floating platform or on proximate land. They are common in deep water industries such as offshore hydrocarbon extraction. They are linked to a host ship by a neutrally buoyant tether or, often when working in rough conditions or in deeper water, a load-carrying umbilical cable is used along with a tether management system (TMS). The TMS is either a garage-like device which contains the ROV during lowering through the splash zone or, on larger work-class ROVs, a separate assembly which sits on top of the ROV. The purpose of the TMS is to lengthen and shorten the tether so the effect of cable drag where there are underwater currents is minimized. The umbilical cable is an armored cable that contains a group of electrical conductors and fiber optics that carry electric power, video, and data signals between the operator and the TMS. Where used, the TMS then relays the signals and power for the ROV down the tether cable. Once at the ROV, the electric power is distributed between the components of the ROV. However, in high-power applications, most of the electric power drives a high-power electric motor which drives a hydraulic pump. The pump is then used for propulsion and to power equipment such as torque tools and manipulator arms where electric motors would be too difficult to implement subsea. Most ROVs are equipped with at least a video camera and lights. Additional equipment is commonly added to expand the vehicle's capabilities. These may include sonars, magnetometers, a still camera, a manipulator or cutting arm, water samplers, and instruments that measure water clarity, water temperature, water density, sound velocity, light penetration, and temperature. Also optical-stero cameras have been mounted on ROVs in order to improve the pilots' perception of the underwater scenario.

Oil spill Release of a liquid petroleum hydrocarbon into the environment, especially marine areas, due to human activity

An oil spill is the release of a liquid petroleum hydrocarbon into the environment, especially the marine ecosystem, due to human activity, and is a form of pollution. The term is usually given to marine oil spills, where oil is released into the ocean or coastal waters, but spills may also occur on land. Oil spills may be due to releases of crude oil from tankers, offshore platforms, drilling rigs and wells, as well as spills of refined petroleum products and their by-products, heavier fuels used by large ships such as bunker fuel, or the spill of any oily refuse or waste oil.

<i>Deepwater Horizon</i> former offshore oil drilling rig

Deepwater Horizon was an ultra-deepwater, dynamically positioned, semi-submersible offshore drilling rig owned by Transocean. Built in 2001 in South Korea by Hyundai Heavy Industries, the rig was commissioned by R&B Falcon, registered in Majuro, and leased to BP from 2001 until September 2013. In September 2009, the rig drilled the deepest oil well in history at a vertical depth of 35,050 ft (10,683 m) and measured depth of 35,055 ft (10,685 m) in the Tiber Oil Field at Keathley Canyon block 102, approximately 250 miles (400 km) southeast of Houston, in 4,132 feet (1,259 m) of water.

Layout

Skandi Neptune has two stern azimuth thrusters, a retractable forward azimuth thruster and two bow tunnel thrusters. Combined with a class 2 DGPS system, these provide excellent manoeuvring capabilities. [7]

Azimuth thruster

An azimuth thruster is a configuration of marine propellers placed in pods that can be rotated to any horizontal angle (azimuth), making a rudder unnecessary. These give ships better maneuverability than a fixed propeller and rudder system.

She has accommodation for 106 persons in single and double cabins. The helideck is rated for Super Puma L2s. [7]

The stern A-Frame is rated at 60 tonne SWL, the deck crane at 250 tonne SWL. The moon pool and 130 tonne traction winch allow the installation of flexible pipe. [7]

Moon pool An opening in the base of a hull, platform, or chamber giving access to the water below

A moon pool is a feature of marine drilling platforms, drillships and diving support vessels, some marine research and underwater exploration or research vessels, and underwater habitats, in which it is also known as a wet porch. It is an opening in the floor or base of the hull, platform, or chamber giving access to the water below, allowing technicians or researchers to lower tools and instruments into the sea. It provides shelter and protection so that even if the ship is in high seas or surrounded by ice, researchers can work in comfort rather than on a deck exposed to the elements. A moon pool also allows divers or small submersible craft to enter or leave the water easily and in a more protected environment.

Service

Skandi Neptune can operate as a pipe-laying ship and provides ROV support.

Footnotes

  1. ↑ "Brattvaag Skipsverft AS". Ship-Info.com. Retrieved 19 June 2010.
  2. 1 2 "Reference List Tulcea". STX Europe. Archived from the original on 16 July 2011. Retrieved 19 June 2010.
  3. ↑ "Ships S19". World Shipping Register. Retrieved 19 June 2010.
  4. 1 2 "Skandi Neptune". Marine Traffic. Retrieved 19 June 2010.
  5. ↑ "Skandi Neptune IMO: 9205720". Ship Spotting. Retrieved 19 June 2010.
  6. ↑ "Skandi Neptune" (PDF). DOF Subsea. Retrieved 19 June 2010.
  7. 1 2 3 4 "Photographs of North East England" . Retrieved 19 June 2010.
  8. ↑ "Vessel Skandi Neptune Runs up DOF Subsea Flag". Rigzone. 10 June 2008. Retrieved 19 June 2010.
  9. ↑ "Norwegian photo help to oil spill site". Oilinfo. Retrieved 19 June 2010.
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