Rotech T4000 Subsea Excavation System
The T4000 system develops 350 horse power and can also be deployed to a water depth of 300 metres for mass flow excavation
It boasts water flow rates of up to 4900 litres per second and water jet speeds of up to 11 metres per second.

Description
The Rotech T4000 is one of a range of patented subsea excavation tools operated by Rotech Subsea Limited.The Rotech tools are currently the "state of the art” in mass flow technology, excavating with a high speed butlow pressure column of water. Key advantages include:
  • Non-contact method of excavation providing high levels of safety for sensitive subseastructures and pipelines.
  • Excellent performance in wide variety of seabed materials, including stiff clay.
  • Straightforward deployment with minimal deck space requirements.
  • Speed and ease of mobilisation. Everything is designed to fit into 20’ containers and hasbeen flown to several projects in the past.

Uses

The Rotech T4000 can be used for a wide variety of subsea excavation requirements, such as:

  • Pipeline, umbilical and cable trenching, pre-trenching or deburial.
  • Pipeline free-span remediation.De-burial of subsea templates, well-heads or jacket members, from seabed materials, mud slides or drill cuttings.
  • Salvage of dropped equipment or vessels.
  • Removal of rock dump.Site preparation for subsea installations.
  • Civil excavation works, including harbour/berth clearance, channel maintenance and sitepreparation for sea defense works.

Excavation Method

The Rotech T4000 excavation tool generates a large volume column of water travelling vertically down to theseabed at a velocity of up to 10 meters per second. The effect of up to 4 cubic meters of water per secondhitting the seabed at this speed creates a powerful excavation force capable of breaking up stiff clays.


For a Full Specification sheet on the T4000, please click here.