Case: Polar research vessel “Sir David Attenborough” ready for Antarctica adventures...

Sir David Attenborough
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Dear *|HTML:FNAME|*

We would like to share a recent repair job with you:

Plowing through polar ice exposes the risk of damaging a ship´s propulsion and steering equipment

The 2021 British build one-of-a-kind research vessel “Sir David Attenborough” has completed extensive sea trials, and her first trip to Antarctica.

At a yard stay at Orskov Yard in Denmark this summer, damage to the rudder equipment was confirmed. The cause of the damages found on the rudder equipment remains unknown, but MarineShaft got the order for repair of the rudder equipment, which was sent to MarineShaft´s workshop facilities in Hirtshals, Denmark.

Case:
The rudder stock had turned inside the steering gear leaving scratches and marks on the upper part of the rudder stock. Furthermore, the rudder blade and rudder stock connection had suffered damage.

The dimension of the rudder stock was Ø639 x 5720 mm.

Rudder stock

After our inspection/measurements of the rudder stock, the steering gear rotor inner sleeve was removed. The rudder stock´s lower cone had been damaged.

MarineShaft has class approval to carry out class approved laser cladding and micro welding, and both “cold” welding techniques were used for this repair. Both techniques do not require PWHT after welding and are well-proven repair methods for parts that do not tolerate regular welding, which was the case for the rudder stock from “Sir David Attenborough”.

The damaged areas were machined and prepared for welding, and liquid penetrant inspection was carried out before laser cladding.

The spots/marks were repaired by micro welding - a welding technique that is ideal for smaller imparks/spots. Read more.

After machining the damaged areas on the rudder stock's lower cone and the rudder
stock´s upper journal, we welded up the areas by laser cladding. Rebuilding damaged areas by laser cladding is a very fast and accurate welding method. Read more.

After the laser cladding process, the rudder stock was machined, and NDT tests were carried out ensuring that everything went according to class regulations, which in this case was LR.

Rudder blade

The damages inside the rudder cone were machined and fitted to the new dimension of the rudder stock cone.

Before returning the equipment, the rudder stock was treated with rust protection. On-site we assisted the yard with mobile machining of the rudder trunk.

MarineShaft is proud to have carried out our repair service to the research vessel and wishes her a safe and adventurous voyage.

Below you can find a link to Orskov´s webpage as well as a link to an impressive video of the beautiful vessel.

https://www.orskov.dk/sir-david-attenborough-at-orskov-yard/
https://youtu.be/fbjA5QSavLE

In less than a month the maritime exhibition SMM 2022 will take place in Hamburg, and MarineShaft is represented.

come meet our team

Between 6th and 9th of September 2022
Hamburg, Germany

You will find us at the Danish pavilion in hall B: EG.405

We always look forward to meeting in person and guarantee that we have a cold Tuborg and nice Danish marzipan cookies ready for you.

If you require a free day ticket, please reply to this email and we will provide it.

Thank you for your interest in our newsletters.
MarineShaft A/S

Hanne Magnussen
Marketing Manager

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MarineShaft A/S I Pier 2 I 9850 Hirtshals I Denmark I Tel. +45 96560202
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MarineShaft · Pier 2 · Hirtshals 9850 · Denmark