Maintaining your Shaft Line - Ship Technology
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Maintaining your Shaft Line

Damage to the intermediate shaft due to bearing failure caused damages to the intermediate shaft belonging to ferry M/F Hardingen.

MarineShaft received the shaft from “Slipen Mekaniske Verksted” in Norway, where the ferry M/F Hardingen was built in 1993. MarineShaft has in the past cooperated with this shipyard on several occasions and been trusted with urgent repairs.

Once the intermediate shaft arrived at our workshop, we immediately dismantled the coupling and inspected the extent of the damages. Measurements unveiled deflection, and we needed to cold straighten the shaft. Before and after cold straightening, we always carry out a MPI test to clarify whether the shaft has any cracks.

Surface areas of the intermediate shaft were damaged and needed to be restored. MarineShaft have class-approval to weld on running shafts using our laser cladding welding equipment.

With a minimal heat input, we can restore/rebuild surfaces to their original size,
leaving no heat and stress to the surrounding areas.

First, we machined the damaged areas to prepare for laser cladding. Hence the laser cladding was carried out. We applied 2 layers of the Inconel 625. Each layer is 0.8mm.

The shaft was put into a lathe for final polishing of the laser cladded transitions, and non-destructive test and control after laser cladding was carried out.

Our Norwegian customer asked us to arrange transport and take care of export documents and customs clearance. A service we can provide our worldwide customers.

Håvard Meyer, engineer and project manager at Slipen Mekaniske, said the following kind words to us: “Bravo, we thank you for your fast and consistently good service.”

Replacement of a new blade tip and repair of damaged 4 bladed
fixed propeller in 3 days

The cargo vessel M/V Ann Rousing needed urgent care of its fixed propeller. All 4 blade tips were damaged, and one blade tip had a twist. MarineShaft was contacted by MARITIM SUPPLY APS for this urgent repair.

In our workshop, we cut off one of the blade tips and made a blade model for manufacturing of a new blade tip.

As we stock bronze plates in different dimensions, we had the material in stock to manufacture this tip immediately.

The blades were hot straightened, and the edges were welded along with the new blade tip. During the repair process, LPI tests are carried out according to classification requirements. The blades were grinded and polished before returning to the owner.
The repair time for this was three days.

The Emergency Response and Rescue Vessel Putford Ajax got a new starboard and portside tail shaft

During a planned docking, it became clear to the Owners of the Emergency Response and Rescue vessel “Putford Ajax” that both starboard and portside tail shafts would benefit from being replaced, as opposed to attempting costly repairs.

MarineShaft were contacted and we received the propeller equipment in our workshop once shipped from the UK. We had the class-approved raw material in stock and we could provide a short delivery time.

The tail shafts measured Ø243mm with a length of 7,470mm with two stainless-steel liners. We also manufactured the new liners shrunk-on fitted to the tail shaft.

The cones of the new shafts were fitted to the existing coupling and its fixed propeller and tested with toolmakers blue.

For water and rust protection, we applied PHILLYCLAD between the liners.
Classification society Lloyds Register did a final review and approval before the shafts were good to go.

This manufacturing took 2 weeks.

Engineering superintendent Mr. Andy Rice from Boston Putford Offshore Safety Limited paid us this recognition after receiving the replacement propeller shafts and equipment back in the UK.

All received with thanks. May I also take this opportunity on behalf of Boston Putford Offshore Safety Limited to thank you and your team for the excellent service you have provided and the time frame you provided it in.

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