Propeller Blades Repaired Underwater

Press Release
Wednesday, June 13, 2012
Photo courtesy of Hydrex

Hydrex diver/technicians straighten the propeller blades of a large container ship moored off Diego Garcia in the Indian Ocean

With all five blades of its propeller severely bent, a 290-meter container vessel needed a fast, on-site solution to restore the propeller’s balance and efficiency.

Hydrex diver/technicians are trained to carry out repairs underwater in the shortest possible time frame and a team was therefore mobilized to the ship’s location in Diego Garcia in the British Indian Ocean Territory to perform a cold straightening of the blades.


The divers installed a monitoring station on a workboat and made all the required preparations. The workboat was then positioned next to the vessel and the team leader went on board to discuss the details of the operation with the captain and the chief engineer of the ship and to go over the safety procedures.



A detailed inspection revealed that the five blades had suffered multiple deformations along the trailing edges and that there were stress fractures and nicks in the same areas. Cracks were also found up to 15 mm deep.



Part of the team started the repair part of the underwater operation with grinding work on the blades to remove the cracks. Once this was done the locations were smoothed to create a hydrodynamic profile on the trailing edges. Meanwhile, the rest of the team also entered the water and prepared the in-house developed hydraulic cold straightening machine for the straightening operation.

The divers carefully positioned the machine over the bends of the trailing edges of the first blade and, in close communication with the team leader on the work boat, applied pressure to return the bent blade to its original state. This procedure was then successfully repeated for the other four blades.



When the divers had also completed all grinding and polishing repairs on all identified cracks and gouges of the blades, they made a full inspection of the newly modified condition of the blades for the attending ABS surveyor and the captain of the vessel. With all parties involved satisfied, the divers demobilized their equipment and returned home.



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

Ship Repair & Conversion

Great Lakes Shipyard Wins EPA Drydock Contract

Great Lakes Shipyard has been awarded a contract for the United States Environmental Protection Agency (EPA) vessel R/V Lake Explorer II. The scope of work will include drydocking,

Fugro Achieves Innovation through Integration

When Aberdeen-based Diamond Offshore wanted to add new functionality to the existing helideck monitoring system on the Ocean Guardian drilling rig in the North Sea,

Refurbished Seajacks Vessels Leave Shipdock Amsterdam

Seajacks Leviathan and Seajacks Kraken are prepared for their coming assignments, following a series of repair and renewal jobs by Shipdock Amsterdam. The shipyard,

Container Ships

Asia-N.Europe Container Freight Rates Jump 21%

Shipping freight rates for transporting containers from ports in Asia to Northern Europe jumped 21 percent to $1,455 per 20-foot container (TEU) in the week ended on Friday,

Matson Reports Solid Q2 2014 Results, Dividend Increased

Leading U.S. carrier in the PacificMatson, Inc. reported net income of $18.1 million or $0.42 per diluted share for the quarter ended June 30, 2014, compared with $20.

Redwood City Sees Cargo Movement Boost

Port of Redwood City reports 19% increase in cargo movement; highest since 2006 and third highest in modern history Reflecting a significant increase in construction

Underwater Engineering

BMT Oceanica Wins Major Water Corporation Bid

Marine and coastal environment specialist, BMT Oceanica (BMT), a subsidiary of BMT Group Ltd, is delighted to announce that it has won the bid to provide Ocean

Crowley Maritime Open Singapore Office

Crowley Maritime Corp. says it has opened a full-service project management and logistics solutions office in Singapore under the leadership of industry veteran William Hill.

North Sea Atlantic Joins the Technip fleet

On Saturday July 26, 2014, a ceremony was held in Bergen to officially name the latest new subsea construction vessel to join the Technip fleet, the North Sea Atlantic.

 
 
Maritime Careers / Shipboard Positions Maritime Standards Naval Architecture Offshore Oil Pipelines Pod Propulsion Ship Repair Ship Simulators Shipbuilding / Vessel Construction 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: 0.1019 sec (10 req/sec)