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Underwater Seal Replacements

SGS offers expert OEM approved seal replacement and repairs.

Face Type and Lip Type seals can be completely renewed and serviced with Original Equipment Manufacturer approval same as dry dock.

Ship Seal Replacement & Repair Services Include:

  • Lip Seals - dry repair and replacement of complete systems, seal ring bonding.
  • Face seals - wet and dry repairs and replacement.
  • Propeller blade palm seal replacement.
  • Bow Thruster - shaft seal, blade palm seal, gear case seal replacement.
  • Stabilizers - fin shaft seal, crux seal replacement.
  • Stern tube sealing to facilitate inboard repacking of water lubricated stern seals.

Face Type and Lip Type seals can be completely renewed and serviced with Original Equipment Manufacturer approval same as dry dock. Face Type seals can be completely rebuilt "wet" where Lip type seals can be renewed, including the bonding of new seal rings, completely underwater using TransHab systems, the transportable habitats of Subsea Global Solutions.

The TransHab system is a light weight, inflatable habitat that is fitted around the stern seal between the stern tube and propeller, thereby providing a dry environment large enough for two technicians to carry out repairs. Using stock adapters TransHab is designed to fit any seal arrangement, including azipod drives, with liner sizes from 280mm - 1200mm.

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Certified Seal Technicians

Professional Diver/Technicians trained and certified by the major seal manufacturers to carry out repairs previously possible only out of the water. Bonding new seal rings, removal or installation of spacer rings, and even complete replacements can be performed at anchor or during cargo handling operations without interference with the vessel's schedule.

SGS is the Authorized Global Service Agent for: SKF Marine (Simplex Seals), the Global Service Partner for Wartsila Seals- JMT (Japan Marine Technology), Deep Sea Seals and Cedervall Seals.

* Exclusive Service Agent - North America and Caribbean for Lagersmit Supreme Seals.

* UW global service agent for SKF

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.

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OEM Approved Underwater Bonding

As part of the system development, representatives of various seal manufactures witnessed test bonding of seal ring samples inside the TransHab at a seawater depth of 12 m. Destructive testing of the samples proved strength values same as that of dry-dock bonding, resulting in the OEM approval and acceptance as permeant with classification societies.

Fast Response

TransHab systems, including electrically powered diving support equipment, are packaged and stored in several compact crates HAZMAT free, allowing them to be shipped anywhere by commercial airlines with little notice.

Underwater Seal Replacements

Hull Cleaning

Ship Seal Replacement & Repair Services Include:

  • Lip Seals - dry repair and replacement of complete systems, seal ring bonding.
  • Face seals - wet and dry repairs and replacement.
  • Propeller blade palm seal replacement.
  • Bow Thruster - shaft seal, blade palm seal, gear case seal replacement.
  • Stabilizers - fin shaft seal, crux seal replacement.
  • Stern tube sealing to facilitate inboard repacking of water lubricated stern seals.

Face Type and Lip Type seals can be completely renewed and serviced with Original Equipment Manufacturer approval same as dry dock. Face Type seals can be completely rebuilt "wet" where Lip type seals can be renewed, including the bonding of new seal rings, completely underwater using TransHab systems, the transportable habitats of Subsea Global Solutions.

The TransHab system is a light weight, inflatable habitat that is fitted around the stern seal between the stern tube and propeller, thereby providing a dry environment large enough for two technicians to carry out repairs. Using stock adapters TransHab is designed to fit any seal arrangement, including azipod drives, with liner sizes from 280mm - 1200mm.

Certified Seal Technicians

Professional Diver/Technicians trained and certified by the major seal manufacturers to carry out repairs previously possible only out of the water. Bonding new seal rings, removal or installation of spacer rings, and even complete replacements can be performed at anchor or during cargo handling operations without interference with the vessel's schedule.

SGS is the Authorized Global Service Agent for: SKF Marine (Simplex Seals), the Global Service Partner for Wartsila Seals- JMT (Japan Marine Technology), Deep Sea Seals and Cedervall Seals.

* Exclusive Service Agent - North America and Caribbean for Lagersmit Supreme Seals.

* UW global service agent for SKF

OEM Approved Underwater Bonding

As part of the system development, representatives of various seal manufactures witnessed test bonding of seal ring samples inside the TransHab at a seawater depth of 12 m. Destructive testing of the samples proved strength values same as that of dry-dock bonding, resulting in the OEM approval and acceptance as permeant with classification societies.

Fast Response

TransHab systems, including electrically powered diving support equipment, are packaged and stored in several compact crates HAZMAT free, allowing them to be shipped anywhere by commercial airlines with little notice.

Looking for underwater maintenance and repair services?

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