Underwater bow thruster repairs around the world

Underwater bow thruster repairs around the world

Our diver/technicians can perform a wide range of repair or maintenance work on bow thrusters. An entire unit can be overhauled, propeller blades and seals can be replaced or repair work on another specific part of a thruster can be performed on-site. These repairs are performed in cooperation with all OEMs and can be carried out while the ship stays afloat with minimum impact on its schedule.

Our goal is to offer you the most efficient solution while maintaining the highest safety and quality standards. This article gives an overview of some of the more important recent bow thruster repairs carried out by our teams.

Underwater reinstallation avoids delay for container vessel
A month after we removed the bow thruster of a 300-meter container ship our men once again mobilized to Italy. They reinstalled the overhauled unit underwater with the use of our flexible mobdock technique.

The available time window for the removal of the bow thruster had been very short because of the tight schedule of the vessel. For this reason the job was split in parts, performed in different ports.

The time frame for the reinstallation was slightly larger, allowing our team to carry out the job during a single stop of the vessel. The divers used our flexible mobdocks to close off the thruster tunnel once the overhauled bow thruster had been brought into the tunnel.

All water was removed from the tunnel. This created drydock-like conditions for our divers while the vessel stayed afloat. The team then secured the unit and connected it. Once this was done the thruster propeller blades were installed one by one. With these in position the ship was ready to sail.

Our men worked in shifts around the clock to finish all tasks as fast as possible. As a result the charterer did not have to worry about his vessel’s schedule.

Replacement in stages keeps cruise ship on schedule
A 208-meter cruise vessel sailing in the Caribbean suffered steering problems after one of its two bow thrusters malfunctioned. Having to depend on assistance every time the ship berthed would quickly become very expensive. Going off-schedule, however, to have the bow thruster replaced would cost the owner both in finance and reputation.

A solution was therefore needed that could be carried out on-site without interrupting the vessel’s schedule. Enter our tried and tested flexible mobdock technique and our experienced diver/technicians.

There was only a time frame of eight hours at each port of call during the ship’s cruise in the Caribbean. It was therefore important that the operation was split up in parts that could be finished before the vessel had to leave again. A perfect planning and constant communication between our technical department in the office and our team on location was essential in achieving this.

Underwater bow thruster operation on Ferry in Oslo
Recently a team of our diver/technicians mobilized to Oslo, Norway for an underwater bow thruster operation on a large ferry. A seal in the gearbox was leaking and needed to be replaced. A small window was made available for the operation, but the repair had to be finished before the next scheduled trip.

Our technical department proposed to replace the defective seal underwater with a tailor-made cofferdam. The cofferdam was designed by our R&D department and fabricated at the Hydrex headquarters in Antwerp.  This allowed the divers to remove the damaged seal ring and replace it with a new one in a dry environment.

Flexibility is an important element of every job Hydrex carries out, but in this case it was crucial that the repair was finished before the ferry needed to depart with its passengers.

If you have any questions regarding a possible bow thruster repair, do not hesitate to contact us.

For more information on thruster or other underwater repairs, please contact one of our offices. We are at your disposal 24/7 and ready to mobilize almost immediately.

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