What is subsea trenching?

What is subsea trenching?

Subsea Cables – Jet trenching or cutting for various types of cables, providing protection from fishing and other risks. Trenching also provides cable stability, preventing movement on the seabed.

What is trenching ROV?

Trenchers dig in cables after their installation. Our fleet includes trenchers for every water depth. The remotely operated underwater vehicles (ROVs) are controlled on board of vessels and can work up to sea depths of 2000 m.

What is cable trenchers?

Cable trenching is a method of laying cables into the ground by digging trenches. The cables are submerged underground via the trench and are then covered by a layer of earth, bitumen or concrete. Cable trenching, also known as underground cabling, became a popular method of installing cables in the early 90s.

What is a subsea Plough?

Cable burial by ploughing has been clearly established as an effective and reliable method for burial of cables. Ploughs are simple tools that offer fast progress rates and a work in a range of seabed types. The ploughs are supplied with an easy to use control system similar to ETA’s jet sled system. …

What is trench dredging?

Trench dredging in soft material (trailing suction hopper dredger/backhoe dredger) Removing material to uncover previously installed pipes (trailing suction hopper dredger)

What type of soil is suitable to fill the trench after laying the submarine pipeline?

The large ones can trench through sand, silt and clay and even through soft rock (sandstone), the trench rates vary depending on the soil conditions. The small jet sleds are only suitable for sand, silt and soft clay. The main constraint of the jet sleds is that they cannot bury the flowlines.

Can Armoured cable be buried in soil?

Armoured cables and cables having an earthed metal sheath suitable for use as a protective conductor may be buried directly in the ground without further protection, except against corrosion, which may be negated by the provision of a plastic covering. Surface fixed cables may be fixed to permanent structures.

What is a grapnel run?

PLGR. The Pre Lay Grapnel Run – or PLGR – occurs a few days before the installation. The ship dredges a grapnel to clear any obstacle that could obstruct the plough, such as fishing nets, ropes, lines… All these refuses are recycled according to current standards.

What is pre lay shore end?

The shore end is the section of cable laid in shallow waters, where the cable ship can not operate. if the distance is longer, a limited draught barge equipped as a cable ship operates an intermediate laying from the cable ship, called a PLSE – Pre Laid Shore End.

What is meant by trenching?

Trenching is a construction method that involves digging a narrow trench in the ground for the installation, maintenance, or inspection of pipelines, conduits, or cables.

Are there oil pipelines in the ocean?

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. In some cases, the pipeline is mostly on-land but in places it crosses water expanses, such as small seas, straits and rivers.

Which is the first towed subsea cable trencher?

Subsea cable trencher – Jetting Bull. A highly effective subsea cable trencher. The Jetting Bull is one of the first towed subsea cable trenchers ever built – a truly pioneering project in the field of subsea cable trenching at its time of completion.

What kind of equipment is used in subsea trenching?

Our strongly innovative capacity enables us to deliver subsea trenching equipment for any purpose or criterion: from soft-soil to hard-rock capability, and from self-propelling ROV trenchers to towed sleds. The highly innovative Arthropod trencher and the Jetting Bull trencher are cases in point.

Who are the leaders in underwater trenching technology?

Subtrench is a dynamic leader in providing ground breaking underwater trenching technology and services worldwide. Subtrench ‘s objective is to provide safe, reliable, environmentally friendly, cost efficient, minimum risk, innovative umbilical, cable, flexible and pipeline trenching in the most effective way to support our Trenching Clients.

What kind of trencher does SeaTools use?

The Arthopod 600 is a subsea pipeline trencher that is suitable for both pre- and post-lay subsea trenching. For this project, Seatools developed an innovative subsea pipeline trenching technique that creates large trenches in hard soils in a very efficient way.