choose one

Polish contender enters AHTS arena

source: Marine Log, April 2004 issue

When Tidewater Marine LLC announced an invitation for bids for the construction of three Anchor Handling Towing Supply Vessels, capable of 80, 100 and 120 tons bollard pull, Poland’s Remontowa shipyard decided to respond. Analysis of Tidewater’s technical specifications made it clear that requirement was for a relatively small vessel with a large load capacity. The vessel also needed to have a large bollard pull and the ability to operate in limited water depths.
Remontowa couldn’t find an “off the shelf” design that met all these requirements. And well-known independent consultants could offer offer only theoretical solutions, based on recycling of previous hull forms and the rearrangement of the equipment. Though the tender stated that only tried and tested vessels would be accepted, Remontowa decided to offer a brand new solution. The gamble paid off and the yard won the contract. It has an order for two vessels for delivery next year that includes an option for two more vessels.

Remontowa code named its vessel the “cost cutter.” The design had to offer the benefit of simple construction and also offer low operating costs on completion. Remontowa determined it had to improve the speed, deadweight and cargo capacity within the constraint of the assumed power output. The right mix would offer lower transportation cost per unit of cargo, in comparison with other available vessels.
Remontowa’s NED (Naval Engine and Design Office) was given the job of wringing increased deadweight, bollard pull and speed from a reduced draft and breadth. Its solution started with a simple hull shape that meant savings at the prefabrication stage.
Remontowa's cost cutter
In the process of winning the order, Remontowa created 30 versions of the design. During the project the yard benefited from cooperation with the Gdansk Design and Scientific Research Center which provided research and tank testing.
“The final product is the result of balanced compromise between the contradicting requirements, and fully satisfies not only the needs of Tidewater Marine LLC but also other potential clients.” says Remontowa.
The shape of the hull can be used on all OSV type vessels with the benefits of increased load and speed.
The Remontowa vessel now under construction has an overall length of 67 m, length between perpendicular, of 61 m and molded breadth of 15.5 m.
It is equipped with adouble-drum, 225 tons, hydraulic, low pressure, anchor handling/towing winch; two 10 t tugger winches; one 2 tons at 10 m reach deck crane; a shark jaws/towing pins set; and a 300 tons SWL stern roller;
Deadweight is 1,850 tonnes on a 4.4 m draft and 1,950 tonnes at 4.6 m draft.
Twin EMD 16-710G7B diesels each produce 2,983 kW at 900 rev/min and drive twin contrarotating C.P. propellers in nozzles, developing more than 90 t of bollard pull. Full speed is 14.5 knots oat MCR. The vessel has two 1,200 kW shaft generators and two 800 kW firefighting pumps, driven from the front end of the main engines via step-up gear.
Meeting DPS-1 class, the vessels has 800 hp electrically driven bow thrusters. The 410 square meters cargo deck area has an allowable cargo load up to 1.000 tonnes.
Cargo tanks capacities are: liquid mud 470 cubic meters (3,000 barrels); dry cargo 193.6 cubic meters; cargo F.O. 900 cubic meters ; cargo F.W. - 790 cubic meters; potable water 210 cubic meters; B.W. 490 cubic meters.
Accommodations for a complement of 28 are provided.

Copyright 2005 Remontowa