Function
Installation equipment used on board vessels and in the sea to pre-install anchors and mooring lines, and to tow-out and hook-up floating offshore wind turbines.
What it costs*
This is included in the anchor and mooring installation contract.
Who supplies them
CAPE Holland, DEME, Fistuca, Huisman, IQIP, Menck, PVE, NOV, Sumitomo and W3G Marine.
From left to right: Stevtensioner and Stevadjuster. Images courtesy of Vryhof. All rights reserved.
Key facts
An AHV is typically equipped with a stern roller, crane, and winches.
- Anchor-handling winches and a stern roller are used to launch drag embedment anchors and mooring chains.
- Cranes are used to place suction and piled anchors on the sea bed. Pumps are used to evacuate water for suction anchors. Pile hammers, drill and grout spreads are used for piled anchors.
- Towing winches are used during tow-out of floating offshore wind turbines and have a holding load of approximately 600 t.
Further installation equipment carried depends on the operation.
- Winches and ROVs are used for retrieval of mooring lines during hook-up operations. ROVs are used to locate submerged marker buoys and support connection to the winch when tensioning mooring chains. Cranes also support connection of the mooring to synthetic fibre lines and eventual hook-up to the floating offshore wind turbine.
- Tensioners are used to obtain the necessary tension in the mooring line to test anchors and to pre-tension mooring systems.
- Marker buoys are used to indicate positions of submerged materials. Some designs can automatically rise to the surface when instructed.
What’s in it
- I.4.1. Anchor-handling vessel
- Cranes
- Drills
- Grout spreads
- Marker buoys
- Pile hammers
- Pumps
- O.2.2.2.1. Remotely operated vehicle
- Stern rollers
- Winches