MT Arctic Flounder
- Alignment of propeller equipment - Kamewa CPP system

M/V Nyksund
- Corrosion on rudder stock and micro welding of propeller shaft
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Dear <<Name>>

As the recently taken photo indicates, MarineShaft had quite a busy summer. As always, our team was ready to step in extra hours, to solve some urgent repairs. Today I would like to share a couple of these repair cases with you.

MT Arctic Flounder – alignment of propeller equipment –  Kamewa CPP System

When MarineShaft was contacted, the 228,5 m long tanker MT Arctic Flounder was in dry-docking for repair. The tail shaft OD-Box shaft & intermediate shaft had been removed from the vessel and transported to a shipyard's workshop, where the run-out measurement showed app. 0,5 mm bentness/misalignment.
MarineShaft, when necessary, send a service engineer to location to carry out the alignment tests for our customers. In this case the run-out measurements were handled in co-operation with the vessel owner and shipyard, and on hand of drawings MarineShaft could give a repair solution/quotation.

MarineShaft received tail shaft CPP Ø1500/565 x 7549mm including hydraulic pipe, OD-Box shaft Ø950/500 x 2535 mm and the intermediate shaft Ø500 x 6775 mm in our workshop in Hirtshals, Denmark Mid-July.

As the flange showed deflection, we machined the reamer holes in flange, increasing them by 1 mm. We manufactured new hydraulic bolts and sleeves to fit.
During the repair the Vessel Manager Mr. Emmanouil I. Kyriakos attended our premises to follow the repair and he made the following statement, when I asked him of his impression:  “Attendance at MarineShaft’s premises was a unique experience”.
Finally, the propeller equipment was tested including: Oil pressure test of hydraulic pipe  – also witnessed by DNV-GL. Final measurement tests – run out control of OD shaft flange after machining and the shafts were MPI tested by 3 part – Force Technology.
MarineShaft offer logistic services. For MT Arctic Flounder we handled the return transport of the propeller equipment. The repair was completed in less than 3 weeks.

As many of you already know our repairs often also include onsite machining.

Rudder stock repair and mobile maching of rudder trunk

This was the case for the vessel M/V Nyksund, that asked MarineShaft to repair damages / corrosion on the journal bearing on its rudder stock Ø360 x 5190 mm. The rudderstock was also cold straightened.

Corrosion is a well known problem. We machined the corroted areas and welded up the rudderstock to original dimension. Regular welding is always followed by heat treatment to remove all tension in the materal caused by the welding.  
A service team traveled to a shipyard in Norway to carry out onsite lineboring of the rudder trunk. We bring our mobile equipment to all locations worldwide.
Insitu removal of scratches on a propeller shaft

For the same vessel and shipyard we also went onsite to remove scratches on the coupling end of a propeller shaft. We used our mobile micro welding equimpent for this repair. Using micro welding the heat input is less than 20% and following machining is not needed. 
Micro welding is ideal for repair of minor scratches on parts that do not tolerate normal welding. Check out our micro welding video here 
Our equipment has the size of a suitcase and easilly transportet to location/insitu.
We will attend  Donsö Shipping MeetRead more about the Exhibition here.

Thank you for your interest in our newsletter.

Best regards

MarineShaft A/S
Hanne Magnussen
Marketing Manager
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MarineShaft · Pier 2 · Hirtshals 9850 · Denmark

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