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Underwater Welding & Hull Repairs

SGS has an unparalleled technical capabilities for all your underwater welding and hull repair needs.

Permanent class approved underwater welding & hull repairs were thought to be impossible until Subsea Global Solutions pioneered the wet underwater welding process.

Class approved permanent repair processes are established using underwater wet welding, atmospheric dry welding or hyperbaric dry welding for permanent repairs to incidental hull damage below the water line. With an in-house Engineering department headed by our Senior Welding Engineer, who has decades of welding experience on topside and underwater, SGS is capable of Structural Engineering and writing repair procedures detailing the welding process and scope of repair to be developed upfront for pre-approval by Head Offices of major Classification Societies or insurance underwriters. Having a pre-approved repair procedure by the Class damage department gives the customer a guarantee that a permanent repair is achieved on time wherever or whenever required.

Welder/Diver technicians are  trained, qualified and their qualifications renewed every 2 years in one of the three training tanks at SGS facilities. All welders WPQR’s are done on Classification Society certified paper to the Class A requirements of AWS D3.6M: Underwater Welding Code.

SGS is the only diving company globally to have a Workshop Approval for Underwater Welding by DNV.

Subsea Global Solutions designs and manufactures cofferdams of all sizes and configurations. Well versed in the development of flexible as well as rigid hyperbaric (open bottom) or atmospheric cofferdams.

Learn more about Underwater Blankings & Cofferdams

Learn more about Underwater Welding in this Build-up Underwater Welding Repair

Looking for Underwater Maintenance & Repair Services?

SGS has an unparalleled technical capability to deliver turn-key solutions at a global scale.
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Hydroweld Representatives and America's Hydroweld Training Center

Hydroweld FS wet underwater welding electrodes are the result of significant research and development into flux formulations, filler metals and supplementary coatings. They are designed to work in all positions in fresh water,  brine or saltwater, and have been used to successfully perform wet weld repairs have been performed to a depth of 300 meters. Their outstanding user-friendly properties and wet welding characteristics, easily produce high quality wet welds to internationally recognized standards. Hydroweld FS is the electrode of choice where high-quality wet welding is required. They have meet the class A requirements of AWS D3.6M for fillet and groove wet welds as has been witnessed by Lloyds Register of Shipping (LR), American Bureau of Shipping (ABS), Det Norske Veritas (DNV), Bureau Veritas (BV), and Rina. Hydroweld FS wet welding electrodes are currently the only wet underwater welding electrodes approved for permanent and temporary repairs on war ships by the British Ministry of Defense (MoD). This was gained after intensive underwater comparability testing and further NDE and destructive testing against all other commercially available wet welding electrodes by the MoD and The Welding Institute (TWI). As a result, the electrodes are now included in the NATO codification system.

Case Studies

Hull Breach on Tanker

During cargo operations, a submerged pile pierced through the hull. SGS 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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SGS 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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SGS 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. SGS 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

SGS 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 SGS

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 SGS, which would help to eliminate the need for additional tug cost.

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Afloat Bow Thruster Blade Seal Exchange by SGS

The project was executed with two SGS 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. SGS’s 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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SGS solves serious problems: Assisting a large, fully laden post-Panamax container vessel with steering issues

SGS solves serious problems: Assisting a large fully laden Post-Panamax container vessel with steering issues. SGS 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. SGS 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.

View full case study

Underwater Welding You Can Trust

To learn more about underwater welding at SubSea Global Solutions, review our latest underwater welding case study.

Underwater Welding & Hull Repairs

Hull Cleaning

Class approved permanent repair processes are established using underwater wet welding, atmospheric dry welding or hyperbaric dry welding for permanent repairs to incidental hull damage below the water line. With an in-house Engineering department headed by our Senior Welding Engineer, who has decades of welding experience on topside and underwater, SGS is capable of Structural Engineering and writing repair procedures detailing the welding process and scope of repair to be developed upfront for pre-approval by Head Offices of major Classification Societies or insurance underwriters. Having a pre-approved repair procedure by the Class damage department gives the customer a guarantee that a permanent repair is achieved on time wherever or whenever required.

Welder/Diver technicians are  trained, qualified and their qualifications renewed every 2 years in one of the three training tanks at SGS facilities. All welders WPQR’s are done on Classification Society certified paper to the Class A requirements of AWS D3.6M: Underwater Welding Code.

SGS is the only diving company globally to have a Workshop Approval for Underwater Welding by DNV.

Subsea Global Solutions designs and manufactures cofferdams of all sizes and configurations. Well versed in the development of flexible as well as rigid hyperbaric (open bottom) or atmospheric cofferdams.

Learn more about Underwater Blankings & Cofferdams

Learn more about Underwater Welding in this Build-up Underwater Welding Repair

Hydroweld Representatives and America's Hydroweld Training Center

Hydroweld FS wet underwater welding electrodes are the result of significant research and development into flux formulations, filler metals and supplementary coatings. They are designed to work in all positions in fresh water,  brine or saltwater, and have been used to successfully perform wet weld repairs have been performed to a depth of 300 meters. Their outstanding user-friendly properties and wet welding characteristics, easily produce high quality wet welds to internationally recognized standards. Hydroweld FS is the electrode of choice where high-quality wet welding is required. They have meet the class A requirements of AWS D3.6M for fillet and groove wet welds as has been witnessed by Lloyds Register of Shipping (LR), American Bureau of Shipping (ABS), Det Norske Veritas (DNV), Bureau Veritas (BV), and Rina. Hydroweld FS wet welding electrodes are currently the only wet underwater welding electrodes approved for permanent and temporary repairs on war ships by the British Ministry of Defense (MoD). This was gained after intensive underwater comparability testing and further NDE and destructive testing against all other commercially available wet welding electrodes by the MoD and The Welding Institute (TWI). As a result, the electrodes are now included in the NATO codification system.

Underwater Welding You Can Trust

To learn more about underwater welding at SubSea Global Solutions, review our latest underwater welding case study.

Looking for underwater maintenance and repair services?

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