Hydrex Repairs Container Vessel Propeller Blades (Singapore)

Recently a team of Hydrex diver/technicians performed a propeller blade operation on a 300-meter container vessel in Singapore. All six blades of the vessel’s propeller were damaged and needed to be cropped.

Having developed different procedures for different kinds of damage, Hydrex is equipped and trained to make the best of a bent or broken propeller. Ideally, the in-house developed cold straightening technique is used. This procedure enables Hydrex to straighten damaged blades in-water, allowing commercial operations to continue without the need to drydock.

In the following example cropping was the only option as the damage to the propeller blades was too great to allow cold straightening. This kind of repair is carried out with the propeller blade cutting equipment developed by the Hydrex research department. In cases where there is an even number of blades an identical piece will be cropped from the opposite blade to restore the hydrodynamic stability of the propeller. By doing so, the best possible efficiency is obtained.

The six blades of a container vessel’s propeller were severely bent. An on-site solution was needed to restore the propeller’s balance and efficiency. A Hydrex diver/technicians team was therefore rapidly mobilized to the ship’s location to restore the damaged blades to as close to their original condition as possible.

Because the ship could be trimmed enough to bring the blades above water, a scaffolding was installed around the propeller. This allowed the team to perform the operation in the dry.

The operation started with a detailed survey of the affected propeller blades. The inspection revealed that the six blades were bent over angles of up to 90 degrees. The team then used the information acquired during the inspection to calculate and determine the correct measurements needed to modify the trailing edges of the propeller blades. Next the divers cropped the blades one by one to give them the correct radius. When the cropping was complete, the blades were polished to make sure that any remaining loss of efficiency would be minimal.

The success of the operation was confirmed by the customer. After the operation the vessels completed sea trial and “managed to increase RPM up to 93 and developed 21 knots,” said Maxim Bolduev, Deputy Fleet Manager Southern Shipmanagement. “Before propeller trimming we got 53 RPM and only 14 knots.”

Press Release, February 28, 2014

Share this article

Follow Subsea World News

Events>

<< Sep 2017 >>
MTWTFSS
28 29 30 31 1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 1

Subsea Expo 2018

The largest wholly-focused subsea event in Europe, Subsea Expo is organised by industry body Subsea UK…

read more >

8th Myanmar Oil, Gas & Power Summit

The Myanmar Oil and Gas Summit is the longest established Oil & Gas event in Myanmar. Every year the event is attended by government…

read more >

European Gas Conference 2018

The European Gas Conference celebrated its tenth anniversary amid an air of increasing optimism following considerably shifting markets in the last few years…

read more >

SPE/IADC Middle East Drilling Technology Conference and Exhibition

The theme for this conference is “Building on Today’s Efficiencies for Tomorrow’s Market.” This will be the basis for the technical agenda…

read more >