Hydrex Delivers Complex Underwater Propeller Repair in Nigeria
Wednesday, 27th May 2026
Hydrex has successfully completed a complex underwater propeller repair on a hopper dredger in Lagos, Nigeria, reinforcing its global capability in specialist marine maintenance.
The vessel required urgent intervention after oil leakage was detected from one blade of its controllable pitch propeller. To avoid disruption to operations, Hydrex was mobilised to perform the propeller repair underwater while the vessel remained in port, eliminating the need for drydocking.
A specialist diving and engineering team was deployed to Lagos to carry out the work under challenging underwater conditions. A detailed inspection confirmed that blade number three was the source of the leakage, enabling the repair plan to be finalised quickly on site.
Complex propeller repair completed without drydocking
The underwater propeller repair involved removing the affected blade and inspecting all sealing surfaces. No structural damage was identified during the inspection. New seals and a sealing plate were installed, with all components carefully lubricated and positioned in accordance with manufacturer and class standards.
Following completion of the repair work, the blade was repositioned using an approved lifting procedure. All blade bolts were cleaned, reinstalled and tightened to specified torque settings. Final leakage and pitch tests were successfully completed, confirming the effectiveness of the propeller repair.
By completing the underwater propeller repair in situ, Hydrex enabled the vessel to continue operating without interruption, avoiding the cost and downtime associated with drydocking.
The project was carried out during the end-of-year period, requiring flexibility from all parties involved. Despite logistical challenges, the repair was completed efficiently through close coordination between the onboard crew and Hydrex teams.
This successful operation highlights Hydrex’s expertise in underwater propeller repair and its ability to mobilise globally to support shipowners wherever vessels are operating.
• Underwater propeller repair completed in Lagos, Nigeria
• Hopper dredger remained operational throughout the intervention
• Oil leak traced to blade number three of the controllable pitch propeller
• Seals and sealing plate replaced during underwater propeller repair
• Final tests confirmed successful propeller repair completion
• No drydocking required, reducing downtime and operational cost
Underwater propeller repair for the offshore shipping industry
Underwater propeller repair has become one of the most important services in the offshore shipping world. When a vessel suffers propeller damage, every hour lost affects schedules, fuel efficiency and operating costs. Instead of waiting for a dry dock slot, shipowners now rely on specialist dive teams who repair propellers underwater, anywhere in the world, without interrupting long voyages or offshore operations.
Why Underwater Propeller Repair Matters
Propellers take a beating at sea. Contact with debris, fishing gear, ice, or seabed material can bend blades or create surface damage. Even small defects increase vibration, reduce thrust and raise fuel burn. Offshore vessels work to tight deadlines, so delays are expensive. Underwater repair teams help shipowners avoid downtime by fixing problems on site, even while the vessel remains loaded or on charter.
How Repairs Are Carried Out
Underwater repair teams use trained commercial divers, hydraulic tools and portable machining equipment.
They inspect the propeller, measure blade alignment and carry out repairs such as:
• Cold straightening of bent blades
• Grinding and polishing damaged edges
• Cropping blades to restore balance
• Removing fouling or marine growth
• Replacing sacrificial anodes
• Checking for cracks or structural issues
These repairs restore smooth operation and reduce vibration, helping vessels return to normal performance without leaving the water.
Global Mobilisation for Offshore Vessels
One of the biggest strengths of underwater propeller repair services is global reach. Offshore vessels operate in remote regions, from the North Sea to West Africa, the Middle East, Asia and the Americas. Repair teams are used to rapid mobilisation and travel with compact equipment that fits into flight cases. This allows them to reach ports, anchorages and offshore fields quickly. Many teams operate 24 hours a day and work in challenging conditions, including low visibility, strong currents and tight underwater spaces.
Benefits for Shipowners
Shipowners choose underwater propeller repair to avoid dry dock costs and keep vessels in service. Repairs are completed faster, fuel efficiency improves and vibration levels drop.
Offshore support vessels, tankers, bulk carriers, cable layers and construction ships all rely on these services to stay operational. The ability to mobilise globally means help is available wherever the vessel is working.
