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Helix Energy Solutions Inc., known as Cal Dive International prior to 2006, is an American oil and gas services company headquartered in Houston, Texas.The company is a global provider of offshore services in well intervention and ROV operations of new and existing oil and gas fields.
A submarine pipeline (also known as marine, subsea or offshore pipeline) is a pipeline that is laid on the seabed or below it inside a trench. [1] [2] In some cases, the pipeline is mostly on-land but in places it crosses water expanses, such as small seas, straits and rivers. [3]
Most offshore-to-shore wind-farm cables are constructed this way. For larger amounts of transmitted power, the AC systems are composed of three separate single-core underwater cables, each containing just one insulated conductor and carrying one phase of the three phase electric current.
The umbilical components are connected to the appropriate connectors on the diver's equipment, mostly on the helmet or full-face mask, and the strength member is usually attached to a strong D-ring on the diver's harness using a screw-gate carabiner or similar connector which will not accidentally release or snag on lines. The US Navy specify a ...
In deeper offshore operations with the wellhead just above the mudline on the sea floor, there are five primary ways by which a BOP can be controlled. The possible means are: [citation needed] Hydraulic Control Signal: sent from surface through a hydraulic umbilical; Electrical Control Signal: sent from the surface through a control cable;
Lay methods consist of J-lay and S-lay and can be reel-lay or welded length by length. Pipelaying ships make use of dynamic positioning systems or anchor spreads to maintain the correct position and speed while laying pipe. Recent advances have been made, with pipe being laid in water depths of more than 2,500 metres (8,200 ft).
Aiviq is an American icebreaking anchor handling tug supply vessel (AHTS) built in 2012 to support oil exploration and drilling in the Chukchi Sea off Alaska.The vessel's primary task was towing and laying anchors for drilling rigs, and oil spill response.