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New, shallow water anchor handler's concept from REMONTOWA Group


Gdansk Shiprepair Yard Remontowa S.A. has signed contract with Tidewater Marine Inc. for delivery of 4 vessels during year 2005 (plus 2 in option). Vessels are to be built in co-operation with companies of REMONTOWA Group.
The hulls of the tugs are being built in Northern Shipyard S.A. The cutting of the steel for the first unit - AHTS 1144/01 - began on 6th of February 2004 and on 19th of February, its keel was laid. On the 29 th of June 2004, the launching ceremony of AHTS 1144/01 took place in the Northern Shipyard S.A. and the unit was hauled to Remontowa S.A. for outfitting.


When Tidewater Marine LLC of New Orleans, Louisiana, USA called in June 2002 for bids for three series (80, 100 and 120T bollard pull) of AHTS, Remontowa's American & Offshore Commercial Department, which is responsible for further development of offshore sector services, had to decide the best way of attitude. Analysis of technical conditions lead to the conclusion, that Customer's expectation is to have rather small vessels in size, but with comparatively large cargo capacities. In addition, the smallest bollard pulls vessel looked as limited water depth operator. Available on the market, typical AHTS projects did not fulfil those conditions, while famous, independent consultants offered only theoretically customised design, since they were providing rather geometrically converted hullforms and/or compilations of previous solutions. Basing on the above, it was decided to prepare own and new concept despite the call for the bids clearly stated that only proven design would be accepted. Finally, contract for newbuilding acquired, proved such Remontowa's attitude suitable and successful.
"Cost cutter" was the nickname given by Tidewater to the vessels, as the guiding principle of projects. It meant not only simple construction and lower construction cost, but also considerably lower recurring, operating costs. As long as demanded vessel's dimensions and bollard pull are observed, the only way to satisfy operating costs lowering expectations is to increase the speed, deadweight and cargo capacity, in terms of maintained propulsion power level. In such case the cost of cargo unit transfer is for sure lower, comparing to competing solutions. Bigger cargo capacity and increased number of voyages, within the same period of time and with comparable fuel consumption, should attract potential clients by offering an advantage in form of vessel's flexibility with her special hullform design, allowing operation either on shallow or deep water oil fields. Opportunity in offering of lower service rates would further sharp operator's competitive edge on extremely tough market at present.


Locally sited Naval Engineering and Design's team, chosen by Remontowa as authors of new concept, examined number of different propulsion systems, sophisticated solutions of ship's body forms, as well as vessel's layout, what resulted in more than thirty well-developed project versions. This would eventually help to fulfil specific needs of other, potential clients, as well as have resulted in compromised and well balanced solution, finally presented to the Owners.
Limited vessel's breadth and draft on one hand, with increased deadweight, bollard pull and speed on the other, seem to contradict strongly and form rather ambitious challenge. Therefore, local Ship Design and Research Centre (CTO) has been employed and extensive programme of tank testing was performed, to prove assumed parameters and to ensure satisfactory seakeeping characteristics as well.
Additional cost cutting gain, important for shipbuilders, is homeliness of applied body shape, which spares labour cost of the hull's erection.
Moreover, promising results of this type of ship, gave excellent hullform for shallow water platform supply vessel (PSV) or other OSV concept, where cargo capacity and vessel's speed may be further, significantly increased, comparing to AHTS results.
Final technical solutions, as well as received results, both offering handy, safe and comfortable workplace, are as follows:

Classification:
ABS class notation of: +A1, (E), Offshore Support Vessel, FFV Class 1, +AMS, +DPS -1;

Length overall         67 m
Moulded breadth   15.5 m
Deadweight          1850 t
Draught                4.4 m

- Twin American maker main engine, 2983 kW each, driving via reduction gears two CPP in nozzles and developing more than 90T of bollard pull and 14.5 knots of full speed at MCR.

- Two shaft generators 1200 kW each and two FF pump, 800 kW each, driven from the front end of ME's via step-up gear.

- Electrically driven bow thrusters, 800 HP each, to comply DPS-1 class.

- Cargo deck area of 410 sq m with allowable cargo load up to 1000 t (5.5 T / sq m).

- Cargo tanks capacities: liquid mud - 470 cu.m (3.000 imperial barrels); dry cargo
193.6 cu.m (7000 cu.ft); cargo F.O. - 900 cu.m; cargo F.W. - 790 cu.m; potable water - 210 cu.m; B.W. - 490 cu.m.

- Double-drum, 225 T, hydraulic, low pressure, anchor handling / towing winch; storage reel of adequate capacity;  two 10T tugger winches; one 2 MT at 10 m arm; deck crane; shark jaws / towing pins set; 300T SWL stern roller.

- Comfortable accommodation for compliment of 28 and complied offshore standards.


Copyright 2005 Remontowa