First Robert Allan RAmpage class offshore support tug deliveredVessel & ROV News // June 24, 2005
Seabulk Angola is the first of the new RAmparts Class offshore/terminal support tug developed by Robert Allan Ltd naval architects of Vancouver, British Columbia, and is designated as the RAmparts 5000 Z-M Class.
The design was developed to respond to the demands of owners for a large, powerful tug capable of supporting offshore terminal operations in more severe weather. These tugs must be capable of the most severe towing duties, but not be as large and as complex as the larger classes of OSVs and AHTS typically engaged in similar work.
Seabulk Angola will be used in support of offshore oil terminal operations off West Africa.The vessel is of rugged all-welded steel construction, with an extended forecastle deck, with a strongly raked, two level superstructure above, topped by a wheelhouse providing maximum all-round visibility.
The aft deck is equipped with crash rails for cargo, a stern gear arrangement suitable for heavy-duty anchor handling, and has space to stow two standard ISO containers under shelter as additional support modules for diving or Oil-Rec operations.
The tug is built to BV notation 1 a Hull, a MACH, Tug, Fire Fighting Ship 1, Water Spraying, Unrestricted Navigation, a AUT-UMS and registered in the Marshall Islands.
Seabulk Angola is 49.50m long with a beam, moulded of 15.00m, depth, moulded of 6.75m and normal operating draft of 4.75m. Draft, loadline is 5.75m and the propulsion machinery comprises a pair of MaK 9M25 diesel engines, each rated 2,970kW at 750 rpm, driving a Schottel SRP 3030CP Z-drive unit.
This combination, on trials, delivered a sustained bollard pull of 104 tonnes, and a free running speed of 14 knots.