We repaired a hydraulic coupling for a general cargo ship. The inner sleeve suffered scratches that were too severe and exceeded the reasonable limit for repair by micro welding or laser cladding. Instead, we proposed repairing the coupling body by machining the conical part to remove the scratches and restore the surface and manufacture a new inner sleeve with customised dimensions.
As we had the raw material in stock we could offer a complete repair time of only seven working days. The coupling was sent to our workshop, where we cut a piece of the worn sleeve for material analysis at an independent third-party laboratory. We could then begin manufacturing a new inner sleeve with the dimensions Ø275x483mm.
This repair was accepted by the involved classification society BV.
Swift repair for the National Geographic Explorer
We recently completed a repair job for the famous National Geographic Explorer, a vessel that sails in the waters of Antarctica during winter and the Arctic in summer. While drydocked in Denmark, on-site run-out measurements revealed deflection in both the propeller and intermediate push rods, each measuring about 12 metres in length and Ø90 mm in diameter.
The repair process:
The push rods were sent to our workshop for cold straightening. This repair also included the manufacturing of new push rod assembly flanges. The intermediate push rod was also modified with bronze liners, which were delivered from the manufacturer.
In just four days, the work was completed and with class approval from the classification society DNV.
Replacement of a propeller shaft bronze liner for a chemical tanker
Another recent repair case involved the manufacturing of a new bronze liner with a diameter of 455mm and a length of 3315mm.
The chemical tanker Stolt Bobcat was in dock in Bulgaria. The owner had experienced some problems and started preparations prior to docking to ensure the delivery of the new liner would be completed on schedule.
As we stock raw materials, including bronze liner material, we were able to offer immediate manufacturing, providing our client with a beneficial delivery time. The owner wanted us to remove the old liner, and we received the propeller shaft in our workshop. After removing the old liner by machining, we carried out a magnetic particle inspection of the tail shaft. The new bronze liner was shrink-fitted to the tail shaft, followed by the final machining of the bronze liner OD and control measurement.
In only 11 days, we completed the job, which was fully class-approved by the LR surveyor.