Underwater Bow Thruster Removal

Press Release
Tuesday, March 26, 2013
Photo: Hydrex

A Hydrex diver/technician team mobilized to Rotterdam last month to remove the bow thruster of a 300-meter container vessel. The unit needed to be overhauled. Hydrex performed the operation underwater using the company’s own workboats based at the Antwerp depot. This made it possible for the owner to keep his vessel out of drydock.

The team mobilized from the Hydrex headquarters in Antwerp after all basic preparations had been made and the needed equipment was loaded onto one of the Hydrex workboats. The Hydrex catamarans are fully equipped as dive support stations with hydraulic cranes, winches, nautical and communication equipment and a dive control room. They can be used for a wide range of operations in Belgium, the Netherlands, the United Kingdom and France, permitting even more rapid deployment from the Antwerp depot. This increases flexibility of operations and helps to keep costs down for the client.

After they arrived in Rotterdam, the divers installed flexible mobdocks on both sides of the thruster tunnel. Next they emptied all water from the tunnel. This created a dry working area around the bow thruster unit. The team could then detach the bow thruster blades one by one.

The blades were replaced by a blind flange to prevent oil leaking from the thruster and water from ingressing. Next the diver/technicians removed the flexible mobdocks again, concluding the first part of the operation.

The following step was to secure the gearbox with hoisting equipment. The team then disconnected the bow thruster unit from the engine room and lowered it onto a cradle. This cradle was designed especially for thruster operations. It can be adjusted to the size of the unit. In this manner the thruster is prevented from tipping over and Hydrex divers can remove the unit in one take.

The bow thruster was then brought onboard the Hydrex workboat, ready to be overhauled. Next the team securely sealed off the engine room by positioning a flange over the space connecting the thruster tunnel to the room. This allows the vessel to sail until the overhauled unit is reinstalled.

With the bow thruster unit on deck the team sailed back to the Hydrex headquarters. From there the unit was transported to the manufacturer to be overhauled.

Performing a job like this on a tight schedule takes a lot of planning. This can only be done successfully by staff who have familiarity with such operations and the relevant know-how and equipment. Hydrex has a technical department capable of executing all the required planning. Our diver/technicians are trained and qualified to perform the full range of required class-approved repair procedures in even the harshest conditions. Hydrex also has very well-equipped rapid response centers including customized workboats, ready to mobilize directly to the job site. This saved the owner precious time and money.
 

  • Photo: Hydrex

    Photo: Hydrex

Maritime Reporter January 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Technology

Zamakona, Finnish GS-Hydro Ink Deal

The presentation ceremony of the Finnish multinational leader in water services GS-Hydro, new partner of Zamakona Yards in Canarias was held yesterday (January 29th at 7 p.

HII Acquires Engineering Solutions Division

Huntington Ingalls Industries (HII) has acquired the Engineering Solutions Division of The Columbia Group, a designer and builder of unmanned underwater vehicles

'World's First Hybrid Superyacht'

Developed by Dutch shipbuilders Feadship, the 83.5m Savannah is touted as the world's first hybrid super yacht. Vessel is 30% more fuel efficient than similar sized counterparts, claims the company.

Ship Repair & Conversion

Raytheon Anschütz Opens Service Center in Panama

German navigation system manufacturer Raytheon Anschütz has established its new subsidiary Raytheon Anschuetz Panama, S. de R.L., in Panama City.   The new company,

Imabari to Construct Newbuilding Dry Dock

In order to accommodate construction of Ultra-Large newbuilding vessels including recently secured 20,000TEU Mega container ships (about 400m in length and about 59m breadth),

German Shipowner Worst Global Dumper -NSP

German shipowner Ernst Komrowski topped the list of the worst global dumpers with 14 end-of-life vessels sold to the beaches, according to a press release from NGO Ship-breaking Platform (NSP).

Subsea Salvage

Indonesia Joins Spain, Italy in Maritime Development Plan

Indonesia to have full cooperation in maritime infrastructure development from European countries Spain and Italy, says a report in Jakarta Post.  Spanish Ambassador

Fugitive Treasure Hunter Arrested in Florida

An Ohio man who recovered as much as $400 million in gold from a shipwreck has been arrested in Florida after two years on the run and was scheduled to appear in federal court on Wednesday.

ASA Mission Statement Revised to Expand Reach

The American Salvage Association has revised its mission statement to increase its area of influence beyond North America, complemented by a new logo that reflects the expanded direction.

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Maritime Standards Naval Architecture Ship Electronics Ship Simulators Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1753 sec (6 req/sec)