Feature 5 | UNDERWATER MAINTENANCE
Subsequently, the support brackets that connected the bow thruster unit to the thruster tunnel wall were reinstalled. Te ship then sailed to Southampton.
At this location the brackets were secured, the pad eyes removed and the propeller blade bolts secured with wire. This concluded the repair. Te vessel can now manoeuvre within
ports again without the need of tug assistance. According to Hydrex: “The delay for the customer was reduced to the strictest minimum and by performing both the removal and reinstallation of the bow thruster unit underwater the vessel did not have to go into drydock.” A Hydrex diver-technician team was
The bow thruster unit being lowered into the water for reinstallation in thruster tunnel.
also recently asked to perform permanent stern tube repairs on a dry cargo vessel during a scheduled stop in Gulfport, Mississippi. Te team, together with the diving equipment, was mobilised from the Hydrex office in Tampa to set up a diving station at the berthing location. By the time all necessary preparations had
Eurogrit can move mountains... when it comes to abrasives!
been made, the team had been reinforced with additional technicians from the headquarters in Antwerp and was ready to assist the vessel as soon as it arrived at Gulfport. The operation started with a thorough underwater
inspection of the stern tube seal assembly, followed by the removal of the rope guard. This revealed a protection ring which was removed to create more space for the renewal of the seals. Next the split ring was also disconnected and brought to the surface to be cleaned. A consequent inspection of the running surface of the stern tube seals showed that it was severely worn and no longer functional. After a discussion with all parties involved, it was decided to remove the spacer ring and create a new running area. The Hydrex flexible mobdock was then installed
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around the stern tube seal assembly and a dry underwater environment was created in which the diver-technicians could remove the damaged seals one by one and replace them with new ones. Aſter these were bonded the entire assembly was put together again and weardown measurements were carried out with positive results. Te flexible mobdock was then removed, and the protection ring and the rope guard were reinstalled, concluding the repair. During the first inspection of the stern tube seal assembly
it became evident that the propeller blades of the vessel were damaged. Te leading edges of all four blades were therefore ground down by the Hydrex divers to bring the propeller’s efficiency back to optimal condition. Te team worked in shiſts to perform the stern tube seal
HVAC from A to Z
repair within the shortest possible timeframe. By keeping the vessel out of drydock, a lot of time and money was saved for the customer, Hydrex points out. SRCT
Shiprepair and Conversion Technology 3rd Quarter 2010
Wilhelmsen Callenberg Fläkt, a member of the world’s largest maritime services network, provides HVAC
CONVERSIONS, SPARES & TRAINING
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