Tension Control
Cranemaster will decouple the motion of the boom-tip from a load which is fastened to the sea bed or to a subsea structure. It is therefore possible to use Cranemaster to keep a load in position without releasing the tension in the crane/winch wire.
Cranemaster benefits
- Fail safe constant tension functionality.
- Works as a constant tension system, but with added dampening preventing abrupt movements.
- Overload protection.
Typical examples of use
- Removal of objects from the sea floor.
- Installation of heavy objects to reduce rapid heeling of the vessel.
- Avoid instability of object between touch-down and fastening.
- Keep tension during operation (sawing, cutting, etc.).
Adjustment and fine tuning of position after touch-down
There are many reasons why the position of a manifoild, transition piece or other object has to be adjusted after initial touch-down.
Cranemaster is ideally suited to keep a certain tension in the wire after touch-down, either to ease the moving of the object without lifting it, or to avoid instabillity of the object.
For both situation Cranemaster will also decouple the wave motion from the load.
Compensation for tool-weight subsea
For subsea tasks such as cutting/sawing during decomissioning, it might be preferable to compensate for the weight of the tool in water. By having Cranemaster tuned to the correct weight, this can be easily acheived.
Featured References – Tension Control
Strand jack heave compensation
Customer Challenge: Motion compensation during maintenance operation on an FPSO external turret mooring structure off the African west coast. As part of the maintenance operation, a swivel was going to be exchanged. [...]
Installation of transition pieces at Greater Gabbard
Customer Challenge: Installation of transition pieces from floating vessels can be challenging. For the Greater Gabbard Offshore Wind Farm project off the UK coast, Jumbo Offshore therefore included Cranemaster® for the installation of transition pieces. [...]
Cranemaster used for load test on Normand Seven
Customer Challenge: The vessel Normand Seven was chartered from Solstad Offshore ASA by Subsea 7 and converted into a subsea pipe laying vessel for a long-term contract in Brazilian waters. Subsea 7 [...]