Corrosion under the shaft sealings
MT Keilir is the only oil tanker in Iceland, and it feeds the whole fishing industry that is in high season now, so getting it back in operation was crucial. The vessel has two stainless steel propeller shafts with a diameter of Ø120 x 3190 mm long. After removing the seals, it became clear that both shafts suffered from corrosion.
MarineShaft was contacted by the MT Keilir superintendent, who luckily knew of our class-approved repair capabilities. The solution here would involve the machining of the shaft diameter and rebuilding the journal areas to the original size by using laser cladding
The propeller shafts were shipped to us by ferry. Upon arrival, the run-out test showed a minor deflection on both propeller shafts. The shafts were put straight, and the journal areas were machined down and rebuilt by laser cladding using Inconel 625 powder.
In only eight days, MarineShaft completed this repair job. We worked during the weekend to get this repair done with the shortest possible repair time.
Propeller equipment repair for the offshore tug boat M/V World Scirocco
While docked at the Hvide Sande shipyard, the shipyard noticed corrosion at the inner seal journal on the starboard and sideboard propeller shafts Ø90 x 5200 mm belonging to the tug boat M/V World Scirocco.
We received the two sets of propeller equipment in our workshop in Hirtshals where we disassembled the propeller hub from the shaft. The shafts suffered from corrosion on all three bearing journals.
Before laser cladding, we machined the three journals. The material used for rebuilding the journals was Inconel 625, and we applied two layers that were 0.8 mm each in thickness.
The push-pull rod head pins were damaged and were machined. We manufactured eight new sliding blocks for the propeller equipment. Everything was control measured before assembling, and finally class-approved by a BV Surveyor.
This case is a good example of a repair job where we both repair and manufacture new parts.
Speaking of new manufacturing and raw materials:
We are busy in the workshop and quite crowded these days. We manufacture replacements for one propeller shaft, three rudder stocks, one pintle, two hydraulic nuts, and one intermediate shaft.
Please remember that we can provide you with a fast delivery time for the new manufacturing of shafts and rudder stocks, thanks to our extensive stock of raw material with class-certificates.