Hydrex Divers Perform Underwater Repair

Posted by Eric Haun
Tuesday, May 06, 2014
Photo: Hydrex

A Hydrex diver/technician team carried out underwater stern tube seal repairs on a 157-meter dredger in Montevideo, Uruguay in April. The ship was suffering from an oil leak, making an on-site repair necessary. Using a Hydrex flexible mobdock the team was able to carry out the entire operation on-site and underwater, saving the owner an expensive and time-consuming trip to drydock.

Hydrex has carried out on-site, underwater repairs and replacements on all types of seals for a number of years now. A dry environment is created underwater in which the divers can work. Several major classification societies have also awarded Hydrex certificates that accept the Hydrex revolutionary flexible mobdock technique to perform permanent underwater seal repairs which previously would have had to be done in drydock.

Every Hydrex office has a fast response center equipped with all the latest facilities, equipment and tools. These centers were designed specifically to increase speed of service. The lightweight flexible mobdocks packed in flight containers allow for a very fast mobilization and a timely arrival of Hydrex teams on any location around the world with everything they need to successfully complete the job.

The following case study gives an account of a recent underwater stern tube seal repairs performed by Hydrex.

Oil was leaking from the stern tube seal assembly of a 157-meter dredger. A team of Hydrex diver/technicians therefore mobilized to the vessel’s location in Uruguay, together with all the needed equipment.

After the diving team had set up a monitoring station they removed the rope guard and performed a thorough underwater inspection of the stern tube seal assembly. This revealed that the entire housing of the assembly was severely corroded and needed to be replaced. Because the housing consisted of split shells, this could easily be done by the Hydrex team.

Next they installed the flexible mobdock. By doing this, the divers created a dry working environment around the stern tube assembly. This is needed for any permanent stern tube seals repair. The team then removed the three damaged seals one by one and replaced them with new ones.

Because the existing running area was worn out, the diver/technicians installed a spacer ring to create a new running area for the seals. Thanks to a newly developed method, this could also be done inside the flexible mobdock, saving precious time and avoiding water ingress during the installation of the spacer ring .

Leakage tests were then carried out with positive results, after which the divers removed the flexible mobdock. The operation ended with the installation of a new rope guard. This was necessary because the old rope guard had suffered severe cavitation damage and could not be used again.

The stern tube seal repair was carried out in less than optimum conditions. There was almost no inwater visibility at Montevideo at the time of the repair. It made the diving operations a lot more challenging than expected. However, our divers are trained to be flexible and adapt to constantly changing working conditions making it possible for Hydrex to perform the stern tube seal repairs under the strictest safety regulations, to the highest quality standards and without any unnecessary delay. The dredger was able to leave Montevideo in time to sail to its next operation.

hydrex.be
 

Maritime Reporter September 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

People & Company News

MHI to Change Name of Group Company

Effective November 1 Mitsubishi Heavy Industries, Ltd. (MHI) will change the name of its group company in Singapore from Mitsubishi Heavy Industries Engineering & Services Private Ltd.

Petrobras P-66 Platform Module to Boost Production

The P-66 platform’s first modules, built at the Tomé Ferrostaal Consortium’s Module Plant located at the Port of Maceió, Alagoas, are now ready and loaded on the São Tomé barge.

Exmar Optimistic About Gas Carrier Market into 2015

Belgian gas shipping group Exmar said on Thursday that the market for its very large and midsize gas carriers was at historically high levels in the third quarter

News

USCG Cutter Diligence Returns

The crew of Coast Guard Cutter Diligence returned to Wilmington following a 45-day patrol in the Caribbean Sea. While on patrol, Diligence served as the

Southern California Port Congestion

Hapag-Lloyd informs about the congestion at the ports of Los Angeles and Long Beach that has reached a critical point. I. Several container ships are anchoring

GAC Starts Green Hull Cleaning Operations in Oman

Oman’s Ministry of Environment and Climate Affairs has granted GAC EnvironHull permission to conduct underwater hull cleaning operations using the brush-and-diver-free

Marine Equipment

USCG Cutter Diligence Returns

The crew of Coast Guard Cutter Diligence returned to Wilmington following a 45-day patrol in the Caribbean Sea. While on patrol, Diligence served as the

GAC Starts Green Hull Cleaning Operations in Oman

Oman’s Ministry of Environment and Climate Affairs has granted GAC EnvironHull permission to conduct underwater hull cleaning operations using the brush-and-diver-free

Ensco plc Reports 3Q, 2014 Results

Ensco plc  today reported earnings per share from continuing operations of $1.93 in third quarter 2014, up 16% from $1.66 in third quarter 2013. Adjusted for a $0.

Underwater Engineering

GAC Starts Green Hull Cleaning Operations in Oman

Oman’s Ministry of Environment and Climate Affairs has granted GAC EnvironHull permission to conduct underwater hull cleaning operations using the brush-and-diver-free

First Libra Offshore Oil Well Confirms Discovery

Libra consortium reports that drilling the first well in the area extension of Libra, the 3-BRSA-1255-RJS (3-RJS-731), confirmed the discovery of good quality

Maersk Interceptor Named in Norway

In a ceremony held at GMC Marine Partners yard in Mekjarvik in Norway, Mrs. Anita Utseth, Senior Vice President in Det norske oljeselskab ASA (Det norske) had

 
 
Maritime Contracts Maritime Security Maritime Standards Naval Architecture Navigation Offshore Oil Pipelines Ship Repair Ship Simulators Sonar
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: 0.2280 sec (4 req/sec)