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 Today


The Maritime Industry's original and most viewed E-News Service

Maritime Reporter February 2016 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Ship Repair & Conversion

Video: Catapult Testing on Aircraft Carrier Abraham Lincoln

U.S. shipbuilder Huntington Ingalls Industries’ (HII) Newport News Shipbuilding division has begun testing the updated catapult systems aboard the U.S. Navy aircraft

USCG to Inspect Storm-damaged Anthem of the Seas

The storm-damaged Royal Caribbean cruise ship Anthem of the Seas is scheduled to return to New York Harbor Wednesday evening where it will be met by a team of inspectors from U.

Beacon Finland Appoints Rio Marine for US Support

Beacon Finland, a maritime-related firm engaged in naval architecture, marine engineering and equipment, has appointed Rio Marine to service its JAK-ATB coupling systems in the U.

Container Ships

Hapag-Lloyd Enhances Conosur Service

Hapag-Lloyd has informed about its service enhancements on the Conosur Service (South America West Coast to South America East Coast). This is being upgraded by

Adani Ports Income Up by 15%

Adani Ports and Special Economic Zone Limited (“APSEZ”), India’s largest port developer and part of Adani Group, today announced the financial results for the quarter

Shipping Corporation Q3 Profit Surges

The Shipping Corporation of India (SCI) declared its unaudited financial results for the quarter ended 31st December 2015 posting a net profit of Rs. 59.66 crores as against a net profit of Rs.

Casualties

42 People Rescued after Abandoning Ship off Hawaii

Forty-two people are safe after abandoning ship approximately 1,800 miles south of the Hawaiian Islands, Thursday, the U.S. Coast Guard reported.   Crewmembers

NTSB to Search for El Faro’s Voyage Data Recorder

Second search mission to sunken El Faro seeks to locate missing voyage data recorder   The National Transportation Safety Board (NTSB) said it will initiate a

Innovative Equipment Will Help Unload Listing Ship

Following Smit Salvage’s salvage of the stricken ship Modern Express in the Gulf of Biscay, another Rotterdam company has now become involved in the rescue operations.

Underwater Engineering

Submarine Tourism in Turkey's Waters

The first tourist submarine in Turkey is waiting to be sent on a voyage that will reveal the wonders of the undersea world of the Mediterranea.   The first submarine

Maersk Drilling Posts Record Profit

Maersk Drilling delivered the best result ever with a profit of USD 751m (USD 478m) in 2015 generating a ROIC of 9.3% (7.1%). The result was positively impacted

Neptune Awarded Kitan Contract

Neptune has been awarded an air diving services contract by Technip Oceania Pty Ltd (“Technip”) for the Kitan disconnection project. The project is offshore

 
 
Maritime Careers / Shipboard Positions Maritime Security Naval Architecture Navigation Pipelines Pod Propulsion Port Authority Ship Electronics Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | 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: 0.0736 sec (14 req/sec)