Diverless Subsea Construction

When it comes to diverless subsea construction work scopes, CTC Marine Projects has the capability and expertise to provide the design, procurement, installation engineering, offshore construction, pre-commissioning and commissioning of subsea protection structures, using a dedicated vessel, heave compensated crane and WROV to provide visual feedback and installation support. The scope of work may be comprised of:

• Acoustic metrology
• Diverless spool installation
• Jumpers and flying leads
• Protective mattress installation
• Subsea Umbilical Termination Unit (SUTU) installation
• Tie-in operations and J-tube pull In

CTC operates a fleet of sophisticated subsea technology and vessels combined with comprehensive engineering expertise to provide project-driven solutions to support a range of subsea protection structure workscopes. CTC has the capability and expertise to design and procure subsea protection structures, as well as provide installation engineering and offshore construction of flexible products and submarine cables.

Subsea Decommissioning

Mooring System Installation

Riser Installation

Subsea Decommissioning

CTC's core focus in the specialism of subsea decommissioning is the decommissioning of pipelines by trenching. This involves lowering the pipeline into the seabed using our range of trenching equipment. CTC undertook its first decommissioning project back in 2007 using a plough to decommission a concrete weight pipeline in the North Sea.

Since then, CTC has expanded its offering to include decommissioning of other structures including:

• Flexible pipelines and umbilicals.
• Subsea protection structures include Buoy recovery.
• Mooring chains.
• Risers.

Mooring System Installation

CTC offers full project management and engineering for all aspects of a mooring system installation. CTC has a proven track record in this type of installation and its scope of work can include:

• Transportation of chains.
• Management of Pile and Hammer suppliers.
• Design and installation of seafastening.
• Design and fabrication of all project specific installation aids.
• Offloading and wet storage of piles.
• Connecting the chains to the piles
• Installation of the piles into the seabed.
• Laying the chains onto the seabed with Touchdown monitoring conducted by our ROV.
• Pre-tensioning of the mooring chains
  
  

Riser Installation

Having gained experience in the field of riser installations, CTC can provide a selection of work scopes including:

• Removal of the existing riser.
• Installation of a new Mid Water Arch.
• Installation of a riser and/ or riser base.
• Subsea tie in of risers.