Case study: Replacement of a cracked rudder stock in a hurry

Replacement of a rudder stock including onsite mobile machining and fitting

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Dear <<Name>>

MarineShaft recently replaced a rudder stock belonging to a vessel from one of the world-leading shipping companies in only 12 manufacturing days.

When unrepairable cracks in the rudder stock are detected, finding fast manufacture of a new rudder stock can be a challenge – especially when the rudder stock is 8 meters long.

We stock raw material in very large dimensions to meet urgent requests

The vessel was in dock at a shipyard in Poland when we received an inquiry for manufacturing of a new rudder stock Ø605 x 8064 mm with stainless steel liners and a new pintle Ø810 x 2281 mm.

With the suitable material and sizes in stock, we could offer a short manufacturing time, and we received the order for the new rudderstock and pintle, including onsite machining and fitting.

With the manufacturing on track, the client asked us to send a technician to inspect the rudder and carry out laser alignment of the rudder line to prepare for later-on in-situ machining for fitting of the new rudder stock and pintle.

We manufactured the new rudder stock and pintle in only 12 working days. The steering gear had been sent to our workshop in Denmark to fit the upper cones on the new rudder stock to the steering gear before shipment.

Before we received the steering gear, it was overhauled by maker in Germany. A new rudder bushing was also manufactured. The involved classification society was DNV.

MarineShaft sent the raw busing material for the new rudder horn pintle busing to the shipyard. After machining the rudder horn onsite, we knew the new diameter for the new bushing.

When the rudder stock and pintle arrived, we had our mobile equipment and four technicians ready to machine the rudder blade cones. The shipyard had machined the bearing bushing, and everything was prepared for reinstallation.

Our technicians worked double shifts to reduce the installation time. We delivered the new rudder stock and pintle with 4 mm oversize, and the rudder cones were machined accordingly.

We always work in close collaboration with all involved parties and thank all involved parties.
.

Best regards
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