Hydrex propeller blade modifications
(Posted on 21/07/19)
Recently teams of Hydrex diver/technicians performed propeller blade modifications on several bulk carriers and tankers. In Singapore, Cáº©m Pháº£ and Amsterdam cropping was the only option for the damaged blades while in Rotterdam the bent areas on a bulk carrier’s propeller blades could be straightened.
The four blades of a 190-meter bulk carrier’s propeller were severely bent. An on-site solution was needed to restore the propeller’s balance and efficiency. A team was therefore mobilized to Cáº©m Pháº£, Vietnam to bring the damaged blades back as close as possible to their original condition.
After the equipment arrived at the vessel’s location the team started the operation with a detailed survey of the affected propeller blades. The inspection revealed that the four blades were bent over angles of 90 to almost 180 degrees.
The team then used the information acquired during the inspection to calculate and determine the exact measurements needed to modify the trailing edges of the propeller blades.
Next the divers cropped the blades and ground their edges to give them the correct radius. When the cropping was complete, they polished the blades to make sure that any remaining loss of efficiency would be minimal.
In Singapore only two of the four blades of a 183-meter tanker needed to be cropped using this technique. The other two propeller blades had suffered small cracks and dents along their trailing edges. Because the damage to these blades was limited, cropping was not required. The divers grinded away the cracks and polished the edges of the blades to prevent further cracking.
A 220-meter tanker in Amsterdam had lost the tip of one of its propeller blades. The opposite blade had not been damaged, but it was also cropped to keep the propeller’s balance.
Four of the five blades of a 182-meter bulk carrier had small bent areas on the tip and trailing edge. These were straightened one by one during the ship’s stop in Rotterdam.
As the other vessels in this article, the bulk carrier could continue its schedule without going off-hire to drydock and with the performance of the propeller restored.
Golden Ocean Group Limited, the John Fredriksen-owned dry bulk shipping company, has announced its results... Read more
NORDEN has contracted with Enviva to transport 1.3-1.5 million metric tons of wood pellets from the... Read more
Leading classification society, the Indian Register of Shipping (IRClass), recently launched a bespoke... Read more
Leading maritime software specialist GTMaritime has appointed satellite connectivity expert Keng Teen... Read more
Frank Tsao Wen-king, founder of International Maritime Carriers (IMC), has died peacefully with family... Read more
Wallem Group is introducing collaborative inboxes to its agency business line, in a move designed to... Read more
Members of the Clean Shipping Alliance 2020 have welcomed a new addition to the canon of scientific... Read more
Polska Zegluga Morska (Polsteam) has taken delivery of the bulk carrier M/V "Karlino" from the Chinese... Read more
MacGregor, part of Cargotec, has signed a framework purchasing agreement with COSCO Shipping to support... Read more
Leading Classification Society ClassNK is participating in the “Cross-industrial Working Group... Read more