Shipowners operating globally require repair partners who can respond reliably regardless of location. In late December, Hydrex once again demonstrated their 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, Hydrex was contacted to mobilize locally and resolve the issue underwater, without the need for drydocking.
Rapid local response with global know-how
They 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, the 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
The 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.
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 the 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.
