Eur Ing Alastair G L Hunter BSc CEng FRINA MIMarE
Consulting Naval Architect

Special Projects: CRB
Seismic Cable Repair Boat

Version 1

Second generation hull form

This new workboat has been designed specifically for the duties of In-Water-Maintenance of Seismic 'Streamers' deployed from Survey ships in Open Ocean conditions, following on from the successes of version 1 of the concept and incorporates many improvements.

The vessel has the following features:

1. Mechanised cable recovery
2. Safety and efficiency of the operation are improved by bringing the cable inboard to the central 'moonpool type working well. This gives safe access to Birds, Compasses etc..
3. Fully self righting by means of a manually operated air bag.
4. High Bollard Pull and manoeuvrability enabling long sections of Streamers to be towed.
5. A removable powered Streamer Storage Drum on foredeck facilitating 'change out' of sections at sea.
6. Optional, self contained and powered ballasting system complete with built in tanks under the foredeck facilitating cable ballasting of oil filled cables at sea.

The vessel is of the Catamaran type with asymmetric deep vee monohedron hull form constructed from marine grade Aluminium alloys. The Cable retrieval system is mounted amidships in the central well.

Principal Dimensions

Length overall 7.4 m
Breadth overall 3.25m
Displacement loaded exc cable 4.7 tonne (approx.)
Displacement loaded inc cable 5.3 tonne (approx.)
Draught (approx.) 0.7 m
Endurance at full power (approx.) 6 hours
Fuel capacities 2 x 130 litres
Bollard pull approx.( 2 x 200 BHP) 1.6 tonne @ 4 knots

Layout

This catamaran vessel is arranged with a machinery compartment at the stern with the working deck forward of this. Crew seating is arranged across the vessel on the leading edge of the Engine Box. A central well houses the Cable Retrieval System and allows the helmsman to sight the cable between the hulls prior to recovery.

The vessel has a rigid foam fender fitted around the gunwale.
The single point lift gantry is fitted amidships and a further gantry mast is fitted aft.

Construction

The hull decks and mast are constructed from welded marine grade Aluminium Alloy. Fuel oil and cable oil tanks are built into the structure.

Related Documents

For further details please contact Alastair Hunter

Download specification 'CRBspec1.PDF'