Shipowners operating globally require repair partners who can respond reliably regardless of location. In late December, we once again demonstrated our worldwide operational reach by carrying out a complex underwater propeller blade seal repair on a hopper dredger while it remained in port in Lagos, Nigeria.

The vessel was experiencing oil leakage from one of the blades of its controllable pitch propeller. With continued operation dependent on swift intervention, we were contacted to mobilize locally and resolve the issue underwater, without the need for drydocking.

Rapid local response with global know-how

We deployed a specialized diving and engineering team to Lagos, equipped to perform the repair in challenging underwater conditions. Upon arrival, a detailed underwater inspection identified blade number three as the source of the oil leakage.

Despite the technical complexity of the repair and logistical challenges associated with operating in the region, our team had no trouble adapting to the evolving situation. As the customer later noted: “we are aware that it was a challenging process, with multiple rescheduling efforts due to customs clearances and other unforeseen issues. However, thanks to your team’s flexibility and commitment, we were able to successfully complete this intervention.”

Executing complex propeller blade repairs underwater

Our divers removed the blade, inspected the sealing surfaces, and confirmed that no structural damage was present. New seals and a sealing plate were installed, with all components carefully lubricated and positioned to manufacturer and class standards.

The blade was then repositioned by the team following an approved lifting plan. They cleaned all blade bolts before reinstallation and tightened them to the specified torque. Final leakage and pitch tests were carried out successfully, confirming the effectiveness of the repair.

“Thanks to your team’s flexibility and commitment, we were able to successfully complete this intervention.”

Reflecting on the outcome, the customer’s technical supervisor commented that “the diving operation was successfully completed, and so far no leakages have been observed. I would like to thank the entire Hydrex team for the excellent cooperation throughout this project.”

Commitment beyond borders

The repair was completed during the end-of-year period, requiring significant flexibility from all parties involved. The customer also acknowledged the dedication of our team members who travelled during the holiday season: “We would also like to express our apologies to the two divers who had to travel during the New Year period.”

By executing this blade seal repair underwater and on location, Hydrex enabled the vessel to continue operating without the delay, cost, or logistical complexity of a drydock visit. The project underlines our ability to support shipowners anywhere in the world, combining global mobilization with technical expertise and a strong commitment to cooperation, even under challenging circumstances.