Marine propellers are designed and manufactured to ensure the highest possible levels of performance and efficiency. However, even minor damage can reduce propeller efficiency and increase the fuel consumption of your propulsion train. For less than the cost of a replacement, Our Metallurgical propeller repair services can give new life to your vessel’s propellers even in cases of serious damage & improve propulsive efficiency.
ROKADE Group provides marine propeller repair services that are subject to a full inspection procedure, which includes customer and class reporting. The repair process includes full heat treatment, dimensional checks, and balancing.
We offer metallurgical propeller blade repairs of any OEM installations.
The standard scope includes:
Metallurgical repairs: such as welding, straightening, grinding & polishing, diameter reduction & trailing edge cutting
OEM independent specialists
Hydrodynamic calculations before repair
1. Blade polishing
2. Straightening of propeller blades according to classification standards
3. Blade tip renewal
4. Replacement of missing tips
5. Propeller modification such as trailing edge modifications
6. Blue fitting
7. Balancing


Propellers spend most of their life cycle under water. Damage of the propeller blades is just one of the consequences.
Wear or damage can remain unseen for a longer period of time. Unless your vessel starts to vibrate. Damaged blades can do a lot of harm to the propulsion installation. This indirectly affects the efficiency and cost for repairs with time as the damage increases over time.
Key Benefits
Improve your vessel’s propulsive efficiency by up to 5%.
Save money – repairing a propeller costs 60–70% less than a full replacement.
Benefit from a quick return on investment, typically between one to three months.
Our Procedure
1
Propeller blade straightening
Heat straightening of blades according to classification standards
Crack control of blade and blade flange by authorised personnel
Grinding including weight/moment control
Complete 3D measuring – compared to original drawing dimensions
Final result where the original optimal propeller performance is recovered
2
Blade and hub welding
Propeller blade tip renewal
Welding of extra material
Blade edge welding and finish grinding
Crack repairs
Propeller hub repairs
3
Propeller blade control
When a propeller blade is received at our Workshop, it will be cleaned and checked from flange to tip, for cracks and surfaces requiring machining.
The following complete 3D measuring of the blade will be compared to the original drawing dimensions.
6
New heat straightening procedure
We use the advanced Induction Heating method for accurate temperature and material structure control in the 700 - 900° C range.
This procedure has been chosen to avoid microscopic cracks and stress of the material.
5
Safe and efficient handling
Our trained service engineers are available for safe dismantling and fitting of the blades at site.
4
Machining of propeller blade
Machining of blade flanges and grinding of blade profiles are performed by skilled, experienced specialist personnel – supported by our your specialist.
7
Intermediate control
Control measurements on the blade will be carried out several times during the straightening procedure – and recorded.
8
Final control
Before shipment and delivery the blades will be crack controlled, inspected and approved by the classification society.
9
Dynamic Balancing
Dynamic Balancing Process will be carried out before job dispatch on SCHENCK Rotec Machines as per ISO1940/1 standard.
Our capacity for job balancing is from 0.5 KG to 30,000 KG, with a diameter of 5 meters.
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