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Underwater Propeller Polishing

According to the ICCT, propellor polishing can reduce gas emissions by 2% - 5% and when executed on a regular period basis; 2.5% - 8%. The same can be said for hull cleaning, which can reduce gas emissions in a range of 1%-10%.

Rupert A+ Propeller Polishing

According to the ICCT, propellor polishing can reduce gas emissions by 2% - 5% and when executed on a regular period basis; 2.5% - 8%. The same can be said for hull cleaning, which can reduce gas emissions in a range of 1%-10%. With the new regulations being adopted by the IMO come 2023 in regard to decarbonization through ship emissions, a trusted underwater service partner who can deliver reliable services around the globe will be paramount to ensure your vessel remains in the acceptable range of A,B, or C.

Propeller surface roughness directly effects propeller efficiency. New propellers are delivered with a higher surface roughness than propellers polished underwater by Subsea Global Solutions. Why? Subsea Global Solutions uses a multi-stage polishing process to consistently deliver a propeller polished better than Rupert "A". What does this mean to your ship? Higher propeller efficiency equals lower fuel consumption. Subsea Global Solutions is pleased to be able to provide Rupert A+ propeller polishing through proprietary techniques delivering a consistent 0.4 micron surface roughness.

Subsea Global Solutions continues to research and develop new process methodology to make this typical maintenance chore into an essential fuel saving efficiency improvement and driving more dollars to ship owners and operators bottom line. Let us be a strategic part of your Ship’s Efficiency Management Plan.

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Test Protocol and Purpose​

The multi-stage process was perfected in Subsea Global Solutions underwater training tanks on actual propeller blades, allowing accurate roughness measurements to be taken electronically. The procedure was developed over time using many conditioning pads of various surface types and materials.  The final outcome established the optimal materials, equipment, and time. ​Wartsila Propulsion attended the testing providing 3rd party verification of all testing results, the Subsea Global Solutions process, and materials used.

Case Studies

Hull Breach on Tanker

During cargo operations, a submerged pile pierced through the hull. Subsea Global Solutions worked together with owner and class to develop repair plan that included the design and installation of an engineered cofferdam.

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Offshore Oil & Gas

A Blue-Chip oil & gas company incurred several defects and cracks in a critical attachment member of an FPSO’s hull – these defects required repair to allow continued operation.

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Skeg Ripped from Azipod

3 month out of dry dock, galvanic corrosion caused heavy cavitation/erosion damage on PORT and STBD side rudders.

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Subsea Global Solutions Reseats Shifted Tailshaft Afloat and Executes a Stern Seal Repair

The client indicated that the tailshaft had shifted aft approximately 200 mm when the ship’s crew was doing maintenance on the shaft coupling. It resulted in the aft water seal losing contact with the liner, causing large amounts of water ingress into the stern tube.

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Subsea Global Solutions Completes an Afloat Rudder Stock Seal Replacement

This complex underwater repair was completed to the client's satisfaction in 5 days in conjunction with various other repair works. Subsea Global Solutions managed both the underwater and internal portions of this repair to ensure each phase was executed seamlessly.

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Underwater Propeller Blade Straightening – Cold Static Loading

Subsea Global Solutions can restore your propeller blades as a permanent repair, to OEM design geometry by cold static loading with our underwater propeller blade press.

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Double Bow Thruster Removal by Subsea Global Solutions

The benefits of removing a damaged bow thruster afloat are many. The customer was able to prevent further damage to the bearings and gears caused by the presence of seawater in the gear housing and the procedures allows the units to be overhauled prior to the vessels next dry-dock—or, they can be re-installed afloat by Subsea Global Solutions, which would help to eliminate the need for additional tug cost.

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Afloat Bow Thruster Blade Seal Exchange by Subsea Global Solutions

The project was executed with two Subsea Global Solutions teams working around the clock. While the vessel trimming process was in motion, the team onboard the vessel began to drain the oil from the thruster while the dive team began removing the bow thruster tunnel gratings to gain full access to the bow thruster.

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Scrubber Overboard Spool Pipe Repairs with 5 Year Warranty

The installation of complete SOx scrubber systems is entirely possible without taking the vessel out of the water. Subsea Global Solutions' involvement is focused on precision cutting of the hull penetrations for the sea chest openings and overboard spool pipe installation below the waterline.

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Subsea Global Solutions solves serious problems: Assisting a large, fully laden post-Panamax container vessel with steering issues

Subsea Global Solutions solves serious problems: Assisting a large fully laden Post-Panamax container vessel with steering issues. Subsea Global Solutions works with port authorities, class, and manufacturers to provide class-approved in-water float out removal, repair, and refit of a 110 mt rudder. Find out how our underwater inspection and survey services deliver practical, cost-effective solutions to a complex offshore problem. Subsea Global Solutions works with port authorities, class, and manufacturers to provide class-approved in-water rudder float out removal, repair, and refit of a 110 mt rudder. Helping owners safely reduce their risk exposure and related costs that would include diversions, delays, and downtime.

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Galvanic Corrosion on Rudders

3 months out of dry dock, galvanic corrosion caused heavy cavitation/ erosion damage on PORT and STBD side rudders.

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Beluga Eco-friendly Propeller Polishing and Niche Area Cleaning System

The Beluga Eco-friendly cleaning system was designed to manage the ever increasing threat of invasive species and—if needed, to also treat soluble metals that may be present in effluent water. With filtration capabilities up to 5 microns, the Beluga system has interchangeable tools that can be connected to it for the execution of hull niche area cleaning or eco-friendly propeller polishing.

Underwater Propeller Polishing

Hull Cleaning

Rupert A+ Propeller Polishing

According to the ICCT, propellor polishing can reduce gas emissions by 2% - 5% and when executed on a regular period basis; 2.5% - 8%. The same can be said for hull cleaning, which can reduce gas emissions in a range of 1%-10%. With the new regulations being adopted by the IMO come 2023 in regard to decarbonization through ship emissions, a trusted underwater service partner who can deliver reliable services around the globe will be paramount to ensure your vessel remains in the acceptable range of A,B, or C.

Propeller surface roughness directly effects propeller efficiency. New propellers are delivered with a higher surface roughness than propellers polished underwater by Subsea Global Solutions. Why? Subsea Global Solutions uses a multi-stage polishing process to consistently deliver a propeller polished better than Rupert "A". What does this mean to your ship? Higher propeller efficiency equals lower fuel consumption. Subsea Global Solutions is pleased to be able to provide Rupert A+ propeller polishing through proprietary techniques delivering a consistent 0.4 micron surface roughness.

Subsea Global Solutions continues to research and develop new process methodology to make this typical maintenance chore into an essential fuel saving efficiency improvement and driving more dollars to ship owners and operators bottom line. Let us be a strategic part of your Ship’s Efficiency Management Plan.

Test Protocol and Purpose​

The multi-stage process was perfected in Subsea Global Solutions underwater training tanks on actual propeller blades, allowing accurate roughness measurements to be taken electronically. The procedure was developed over time using many conditioning pads of various surface types and materials.  The final outcome established the optimal materials, equipment, and time. ​Wartsila Propulsion attended the testing providing 3rd party verification of all testing results, the Subsea Global Solutions process, and materials used.

Beluga Eco-friendly Propeller Polishing and Niche Area Cleaning System

The Beluga Eco-friendly cleaning system was designed to manage the ever increasing threat of invasive species and—if needed, to also treat soluble metals that may be present in effluent water. With filtration capabilities up to 5 microns, the Beluga system has interchangeable tools that can be connected to it for the execution of hull niche area cleaning or eco-friendly propeller polishing.

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