YVC Bolnes Dockyard, Rotterdam, Gets Two Conversion Orders
YVC Bolnes Dockyard, Rotterdam, Holland recently completed one conversion contract and signed another. The dockyard landed a contract for the lengthening of the fish factory trawler Johanna Maria (SCH 33), operated by Jaczon - Scheveningen, Holland. Also, much of the work has been completed for a contract the yard signed in June 1993 with Tideway Marine & Offshore, Breda in Holland, a subsidiary of Dredging International in Zwijndrecht, Belgium, for the conversion of the 456-foot long (139 m) heavy transport vessel Super Servant 1 into a D.P. Fall Pipe Stonedumping Vessel. The heavy load carrier was purchased from Wijsmuller - Ijmuiden, Holland..
The Johanna Maria has to be lengthened 49 feet (15 m), and then will be modified for palletized cargo.
Under supervision of Bolnes Dockyard's engineering manager, detailed fabrication drawings were made for the conversion of the Super Servant 1 by IHC Gusto Engineering for the structural part, and by Verolme Heusden for the mechanical part. The Super Servant 1 has a loading capacity of approximately 13,000 tons for rock dumping operations, has a 105-foot (32 m) breadth and a 28-foot (8.5 m) draft.
In total, 800 tons of new steel has been prefabricated and installed on the heavy load carrier.
As subcontractor of Bolnes Dockyard, the shiprepair yard Scheldepoort in Flushing, Holland carried out the drydocking and all underwater work. A moonpool was installed in way of the dumping tower, as well as two thruster spaces for the Lips steerable retractable azimuth thrusters, which were installed later at the Bolnes Dockyard. The vessel's complete hull was gritblasted and painted. For compensation of the longitudinal strength of the vessel flatbars were welded on the bottom and deckplating.
For the lengthening of the Johanna Maria, engineering and work preparation will be carried out by YVC Ysselwerf in Capelle a/d IJssel; steel supply and plasma-cutting will be carried out in the most modern prefab facility, YVC Groot-Ammers in Groot-Ammers. Work at the YVC Bolnes Dockyard will include: Prefab section, including complete outfitting; insulation of section; cutting of vessel and fitting of 49 foot section; steel reinforcements on deck; additional generator set; additional freezers installation; additional fish processing equipment installation; lengthening anchor chains; widening of bilge keels; expansion tanks for brine; electrical work; piping work; painting work; inclining experiment. The Johanna Maria is due to arrive at the yard in mid April and the lengthening of the vessel is expected to be completed in early June 1994.
In Bolnes Dockyard's large fabrication hall a new accommodation unit in two layers has been fabricated and installed on board the vessel by sheerlegs. The new accommodation unit aft of the existing one consists of cabins, gymnasium, offices and a changing room.
Underneath the new accommodation unit are the stores and an additional generator room. In the generator room two Caterpillar generator sets are installed (1800 kVa each) together with the new switchboard, supplied by GTI Marine & Offshore. In total, approximately 25 km of new electrical cables have been supplied and installed. Silencers for the generator sets were delivered by Mercurex.
Deck Two new stone bunkers and water barriers were constructed and installed on the deck of the vessel. Both stone bunkers have a width of 69 feet (21 m) and a height of 17 feet (5.2 m). For unloading of the stones two Liebherr excavators mounted on a pedestal have been installed.
Two longitudinal conveyor belt systems bring the stones to a buffer hopper located at midship on the starboard side. Underneath this hopper a transverse conveyor belt system continuously supplies the stones to the entrance of the fall pipe inside the stone dumping unit. This stone dumping tower, fabricated by Huisman/Itrec, has been installed by sheerlegs. All conservation work was carried out by Muhlhan.
A redundant DP System, made by Simrad, has been installed on the bridge, which has been enlarged to be able to install all new equipment, including a survey system.
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