Underwater Repair & Maintenance

Dive Marine Services – Repairs

Underwater Propeller Damage Repairs

We know that underwater propellers are easily damaged if they strike a buoy, floating logs, debris or ice. The damage is usually located at the tip of the blade, which can become bent or chipped, causing vibrations. The solution is to trim the blades equally to remove the damage and achieve a proper balance while at the same time reducing excessive cavitation. This technique requires extremely accurate measurements of the diameter of the individual blades to reduce to an absolute minimum the amount of material removed and to ensure the perfect propeller balance.

When trimming damaged blades, the nature and location of the damage determines the type of repair we carry out. Modifications are made depending on the desired RPM impact which restores the RPM/MCR ratio.

Underwater Welding, Cutting and Sealing

We utilize the very best tools and techniques available, such as Hydroweld and Broco electrodes for external or internal repairs.  These are proven to produce the most constant temperature delivery for the best weld quality possible. We place a high emphasis on the competency of our underwater welders who are AWS D 3.6 Wet-Welding certified, and approved by DNV.   

Underwater sealing of leakage holes are treated  by using double bolted “sandwich” repairs to secure the 10mm leakage hole with epoxy application, thus ensuring the best results. 

Dive Marine Services – Underwater Ship Repair and Maintenance Services

• Underwater Hull Cleaning and Ship Maintenance: We use a broad range of sustainable services including Remote Operated Vehicle (ROV), the Typhoon MC311 and the Brushkart in addition to innovative technologies for debris collection and filtration customised to the needs of the specific vessel in our care.
• Propeller Cleaning, Polishing and Maintenance: Ship propellers may occupy a relatively small surface area compared with an entire hull, but they are subject to similar issues as ship hulls which can take a toll on overall ship performance.
• Plugging and Blanking Maintenance: With countless hard-working valves and pipes in place on every vessel, it is no surprise that these important elements also need regular maintenance and renewal. Regular care can reduce avoidable down time and expense.
• Echo Sounder and Doppler Speed Log Maintenance/Renewal: Dive Marine Services has 10 years experience in carrying out renewal, repair and installations, such as  Japan Radio Company (JRC) and equivalent echo sounder and Doppler speed logs.