Marine Propeller Repair and Dynamic Balancing
Last Updated on :30-December-2020
Marine Propeller Repair Dynamic Balancing
Marine propellers are manufactured to guaranteethe delivery of high levels of efficiency during the performance. However, even small damages can decrease the propeller efficiency and increase the fuel consumption of the propulsion train.
Our Metallurgical propeller repair can give new life to your vessel’s propellerseven in cases of serious damage and improve propulsive efficiency at a cost lesser than of replacement.
We have recently repaired a Marine Propeller of following details
Material – NiAl Cu3
Diameter –2950 mm
Weight – 2500 kg
RPM – 300
Scope Of Work Involved In Propeller Repair
Measurement of Diameter, Blade Profile pitch and other dimensions
Inspection of heavily damaged / bend blades
Checking hydro-dynamic calculation
Preparing for Repair
Marking of Bend area & areas of repairs
Heating of bend area
Hot straightening of blade profile pitch
Grinding & Polishing
Checking for microscopic cracks using DP test
Dynamic balancing
Final Reporting & Dispatch
Repair Process followed is briefed below
Step:1
Initially, Measurement of Diameter, Blade Profile pitch and other dimensions, were done
Step:2
Thorough Inspection of heavily damaged / bent Blades were carried out by our Engineers, to ascertain the extent of the Repair involved.
Step:3
After the inspection, the Blades which needed repairs, were identified marked for taking further step
Step:4
Bent area and area where repairs were needed, were marked
Step:5
Repairs were taken by Heating of bent area & Hot straightening of blade profile pitch
Step:6
The repaired area was then thoroughly ground and finished and achieved maximum smoothness.
Step:7
Post repairs, grinding and finishing, the job was checked for any microscopic cracks, by way of Dye Penetration (DP) Test.
After completion of the Repairs activity to our and the Client’s satisfaction, the Job was taken-up for Dynamic Balancing.
Balancing Machine Details
SCHENCK H 70 U / BU + CAB690.
Capacity: 30 Kgs. To 30,000 Kg
End Drive and Belt Drive.
Diameter: 4.5 meter
Length: 13.5 meter
Step:8
Mandrel with exact dimensions to suit the dimensions of the bore, was made for carrying out Dynamic Balancing.
Step:9
After carefully placing the Propeller Assembly on SCHENCK Dynamic Balancing Machine, programme was set-up on the CAB Instrument, for un-balance checking.
Step:10
After checking un-balance level, Dynamic Balancing was done by mass correction using removal method
Step:11
After successful and satisfactory completion of the scope of work as briefed above, the Propeller was kept safely for loading unto the truck.
Case Study
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