Underwater Shaft Seal replacement- 3 seals in a week….

DSC02693No one likes a leaking shaft seal.  Neither the ship, the environment or the office is happy when this occurs!  Subsea Global Solutions has pioneered the methodology to performing a permanent replacement of shaft seals underwater in either a wet or dry environment.  By working closely with our OEM partners, Subsea Global Solutions sets the standard for shaft seal renewal while a vessel remains afloat and in service.  As seals design changes occur and OEM’s find more robust materials for the industry Subsea Global Solutions stays ahead of the competition by improving our process and procedures.

Last month, Subsea Global Solutions was busy executing three (3) shaft seal replacements in one week.  This involved three crews of professional diver / technicians mobilized to three locations on two continents on either side of the world.  By maintaining a full compliment of fully employed and factory certified diver / seal technicians on staff together with equipment strategically located around the world,  Subsea Global Solutions was able to mobilize quickly and deliver a factory warranted and class approved seal renewal in all of the cases.

Each case required careful planning and timely execution since all vessels remained in service and on very tight itineraries.  In all cases Subsea Global Solutions removed the rope guards using their carbon arc hydro-gouging system.  By surgically removing the welds attaching the rope guard to the stern tube, the rope guard can be easily reinstalled once the shaft seal exchange is completed.  With full access to the seal, the Diver / Technicians could assess the damage.

09 oil passage hole blocked - air testIn one seal exchange the flexible Hyperbaric cofferdam, Transhab was installed securely into place.  With precision and care the damaged seal lip rings were removed and reinstalled using a factory approved bonding process and bonding agent.  Once completed the Diver / Technicians performed quality control measurements and pressure tests to ensure a proper seal fit.  Upon completion of the seal renewal, the rope guard was welded back to the stern tube by coded welder  / divers.  Subsea Global Solutions maintains class approved “A” class wet welding procedures.  All welder / divers are coded to this procedure which ensures a top quality and class approved weld is executed on the rope guard.

New Picture (6)In another case, once the rope guard was removed giving full access to the face and seat on a specialized new generation face type seal.  Due to the critical nature of the face and seat materials, specialized training and certification was required from the seal manufacturer.  With Subsea Global Solutions maintaining certification with the OEM in this case, Diver / Technicians were able to perform the renewal completely wet utilizing an OEM and class approved procedure.  Without flooding the stern tube and controlling any oil release from the stern tube, the face and seat was renewed restoring the sealing capability of the shaft seal.  Upon completion of the seal renewal, the rope guard was welded back to the OLYMPUS DIGITAL CAMERAstern tube by coded welder  / divers utilizing the class approved “A” class wet welding procedures.

From Australia to America and back  all in one week!  Subsea Global Solutions delivers unrivaled service day in and day out without fail!  We are here to serve you!



OLYMPUS DIGITAL CAMERANo one ever plans to perform shaft seal repairs to their vessel.  These failures typically happen at the most inopportune time and in the most remote locations.  While a vessel was transiting in the South Pacific, issues with the shaft seal developed.  Subsea Global Solutions was immediately put on alert together with the seal manufacturer.  Under consultation from the seal manufacturer and considering the location of the vessel it was decided to perform an inboard temporary repair to allow the vessel to transit to a suitable location to perform a permanent shaft seal replacement.  With this temporary repair in place the vessel transited back to the North American West Coast where Subsea Global Solutions’ West Coast office attended the vessel while it performed cargo operations.  Subsea Global Solutions deployed one of its dozen Transhab flexible hyperbaric cofferdams specifically designed to create a dry hyperbaric environment around the shaft seal system.  Due to the unique design of this particular vessel’s stern tube, the engineering department at Subsea Global Solutions created a unique adapter flange to accommodate this Transhab fit up.  Since the Transhab system is completely independent of the sealing system it allows a complete shaft seal replacement, housing replacement, liner replacement and even a shim installation or removal; all done in a dry hyperbaric environment.

09 oil passage hole blocked - air testOnce the TransHab was installed the seal area was “de-watered” and a Original Equipment Manufacturer approved seal replacement was performed by certified and trained diver technicians.  Seal replacement included the replacement of all of the lip seal rings utilizing an approved dry hyperbaric bonding method.  Subsea Global Solutions is the only underwater service contractor that consistently trains annually with this seal manufacturer and maintains diver technicians certified to service and bond new shaft seals in a dry hyperbaric environment.  By maintaining diver technicians fully employed with this high level of training, Subsea Global Solutions together with the Original Equipment Manufacturer can provide a full factory warranty on this seal replacement.

Once the shaft seal was replaced the rope guard was welded back into place utilizing the “A” class wet welding procedures developed by Subsea Global Solutions and are class society approved.  By utilizing coded divers to this procedure, the welding performed was considered permanent according to class thus eliminating any notations on this repair performed.

The vessel sailed away with a completely renewed shaft seal system with a minimal impact to its schedule.  This critical repair allowed the vessel to remain in service even though it had years ahead of it to it’s next scheduled dry docking event.

Subsea Global Solutions is your one source for global underwater service.  The Cornerstone of our success is our ability to put your needs first and foremost in  the solutions we develop.  We remain your trusted resource in and out of the water so please feel free to contact us at any time. in any one of our 10 locations globally!


Tunnel thruster repairs in the tunnel- UNDERWATER DURING CARGO OPS!

vlcsnap-2014-08-15-11h36m24s149Tunnel thruster repairs performed in the tunnel while a vessel remains in service has become the norm as opposed to the exception.  With the volatility in the markets, container ship as well as Cruise and Ferry customers have driven Subsea Global Solutions to develop pioneering solutions to tunnel thruster repairs in a dry environment completely underwater without taking a vessel out of service.  This includes the development of in-water repair solutions as well as in-water exchange solutions for all types of tunnel thrusters.

During this past month, Subsea Global Solutions permanently repaired 5 tunnel thrusters on vessels globally.  These permanent repairs were performed in dry hyperbaric environments utilizing the Subsea Global Solutions flexible hyperbaric door system.

vlcsnap-2014-08-15-11h14m44s209Recently Subsea Global Solutions was contracted by an Original Equipment Manufacturer to perform in-service warranty repairs to several of their tunnel thrusters on a series of affected container ship vessels.  Warranty repairs that were performed to the tunnel thruster included upgrades to the pitch control system, blade sealing systems and blade bolts.  Due to the extensive amount of work that was required and to ensure the vessel schedule was not affected, Subsea Global Solution’s West Coast North America office performed the work around the clock with two qualified teams of diver technicians.

vlcsnap-2014-08-15-11h19m32s8While the vessel remained along side performing cargo operations Subsea Global Solutions performed these in-water warranty repairs.  Within hours of the vessel’s arrival into port, the tunnel thruster grating system was cut away to attain access to the affected thrusters.  Utilizing Subsea Global Solutions “A” class wet welding procedures, our coded welder divers installed load bearing attachment points to the thruster tunnel.  Once properly installed, the Flexible Door system developed by Subsea Global Solutions was installed.  The thruster tunnel was “de-watered” and the diver technicians entered the thruster tunnel to begin work.

vlcsnap-2014-08-15-11h55m53s65CPP Propeller blade seals, blade shim plate installations, OD box repairs and pitch control pipe modifications were performed during these underwater interventions.  All work was completed within the required time frame allowing the vessel to leave port on it’s normal schedule.

Once the work was completed, the units were fully tested and grates re-installed utilizing the “A” class underwater wet welding procedures.  With the use of coded welder divers together with the class approved procedure, permanent installation of these grates was attained.

Delivering unrivaled service in and out of the water is the cornerstone of our business.  Delivering this service in a cost effective way with certified personnel and procedures is our service promise to you our valued clients.  We look forward to supporting your services globally when required.

Finned Propeller Boss Cap- Installed underwater during Cargo Operations!

P1020037 Achieving instantaneous fuel consumption savings sounds like magic right?  WRONG!  The installation of Finned Propeller Boss Cap systems have a proven track record of delivering a propulsion system efficiency improvement of between two and seven percent; based on current vessel design, propeller design and system installed.  Subsea Global Solutions has installed all types of these systems produced by all of the leading manufacturers.  Together with the original equipment manufacturers, Subsea Global Solutions develops complete repair procedures that detail exactly how the boss cap will be exchanged and re-installed with an OEM and class approved method; ANYWHERE AND ANY TIME.

OLYMPUS DIGITAL CAMERASubsea Global Solutions has been the contractor of choice for several global shipping companies since we are able to provide ONE fixed price to perform the exchange of these Boss Caps in any one of our ten locations globally.  What this means is that if a vessel transits to Rotterdam, Italy, through the Panama Canal, Miami or even the West Coast of the USA, Subsea Global Solutions can exchange the Boss Cap with an approved method at a fixed schedule and price.

P1020040Over the past three (3) months, Subsea Global Solutions has installed 5 finned Propeller Boss Caps for one global container ship operator.  With their intention of installing them on their entire fleet, this client wanted a global service provider who could provide them with a fixed price and schedule so they could work with their charterers on planning these vessel performance improvements while at the same time they wanted to control the costs associated with this work.  Subsea Global Solutions has consistently delivered on our proposed schedule from multiple locations globally.  From start to finish, Subsea Global Solutions has consistently exchanged these units in 28 to 32 hours.  Since we have demonstrated our performance globally, this operator has committed several more installations of the finned boss cap systems.

Subsea Global Solutions is your one source for global underwater solutions.  We consistently deliver quality services globally with our dedicated pool of professional and focused diver technicians.  We look forward to working with you on your efficiency initiatives globally!

Propeller Polishing and Hull Cleaning- Europe, North America, Brazil and the Caribbean

SGSMIAMI-JUNE2014Subsea Global Solutions is driven in everything we do in and out of the water.  With this being said, we continue to grow our foot print with wholly owned assets and locations around the world.  In addition to setting up our own stations globally, we continue to invest in the development and testing of our equipment to ensure the highest quality of service with minimal to no impact to the most sensitive Hull Coatings.

SGS-Italy-01SGS-Spain-01As reported earlier, Subsea Global Solutions has grown it’s global foot print in the Caribbean (Trinidad), South America (Brazil) and Europe (Spain and Italy) over the past 12 months.  We have invested in the permanent stationing of world class equipment, staffing of full time employees and the incorporation of state of the art processes to ensure our clients can receive consistent and reliable service from the “One Source for Global Underwater Solutions” through our own wholly owned network of global locations.

IMG_5115Remaining on the fore front of the development of advanced techniques to improve our service,  Subsea Global Solutions has developed processes to improve propeller polishing and Hull Cleaning.  As reported earlier this year, Subsea Global Solutions developed a unique process to evaluate the propeller surface finish and apply a sequential polishing process to achieve a Super Polish on the propeller blades (4 times better than Rupert “A”).  Additionally, Subsea Global Solutions remains the only global underwater ship maintenance provider that is continuing to develop equipment and certify their equipment with the newly formulated Friction Release Coatings (FRC) being offered for ship’s hulls by major coating suppliers.  Subsea Global Solutions has successfully completed performance tests HC test in Spain- May 2014with Jotun and Hempel.  We are preparing tests with International Paint on their latest coatings to be introduced to the market.  Lastly, we are active in the market place educating port authorities, developing port specific procedures and gaining approval for underwater Propeller and Hull Maintenance in locations that were previously closed to service.

Subsea Global Solutions is your secret to on time and on budget vessel operations.  Let us apply our global foot print and highly skilled work force to your vessels so you can get the most out of your maintenance budget without it GOING UP THE STACK!

SGS Solutions for Offshore Installations

DSC02012Making the impossible possible is just what we do each and every day at Subsea Global Solutions.  Thinking about how to develop innovative solutions requires us to work professionally in and out of the water.  During the past months, Subsea Global Solutions has been very busy supporting Offshore installations around the world.

Our services have included technical in-situ repairs of Thrusters, the exchange of thrusters as well as the execution of shell plate repairs to vessel hull’s in remote locations around the world.  In-Water Surveys and maintenance services including Hull Cleaning have been performed as well to the highest standards.  Due to the high value of Offshore vessels, any off-hire time or delays coming on hire are a big deal.  This requires unique and thorough repair procedures and time lines to be developed so that any maintenance or repairs performed have minimal or NO impact on operations.

DCIM100GOPROSometimes there is not enough time or spare equipment available to execute a tunnel thruster exchange.  With this being the case Subsea Global Solutions has created innovative methods of in-tunnel repairs.  During a recent wet dock event tunnel thruster shaft seals were replaced on several tunnel thrusters while the vessel remained afloat.  Utilizing the Subsea Global Solutions flex door system, a dry hyperbaric environment was created in the thruster tunnel; thus allowing factory trained diver / technicians to execute a permanent repair to the tunnel thruster lower gear box.  While this critical work was being performed underwater, the vessel’s operator were able to execute other work and vessel outfitting with no impact to it’s return date back to service.

Demountable Azimuthing thrusterEfficiently exchanging azimuthing thrusters requires coordination, good communication and a detailed plan.  Being Driven in Everything we do, Subsea Global Solutions created a precise plan for the exchange of azimuthing thrusters in-shore utilizing rig mounted cranes and other equipment.  By working closely with the client and manufacturer of the azimuthing thruster, Subsea Global Solutions effectively changed one thruster every 12 hours.  Focusing on Safety everyday ensures that everyone completes the job just like they started.  An incident free service equates to a happy client!


Subsea Global Solutions is your one source for Global Underwater Solutions.  We understand that time is money in the marine industry and we are always ready to serve your vessels; anywhere any time!

Subsea Global Solutions- SPAIN- NOW A HOME PORT!!

SGS-Spain-01Subsea Global Solutions is pleased to announce that our European founding member Trident BV has expanded into Spain and Northern Africa by acquiring a substantial number of shares in Underwater Contractors Spain.  With this new addition to our global network we now cover locations throughout Spain and Northern Africa including the ports of Algeciras (home port), Barcelona, Cadiz, Huelva, Malaga, Valencia and Tangiers Morocco.  Subsea Global Solutions continues to grow where our clients are sailing.  Whether you require a propeller polish or a permanent shell plate repair, Subsea Global Solutions maintains the necessary personnel, equipment and resources to support your needs.

Subsea Global Solutions continues to grow organically and through acquisition so we can remain “Your One Source For Global Underwater Solutions” .  Today we are among the largest Global Commercial diving contractors supporting the commercial maritime industry.  Feel free to contact any one of our offices to open you up to this organization that prides itself on being quality driven in everything we do in and out of the water.  We will make the impossible Possible any where any time!

Propeller Polishing- Rupert “A” and BEYOND!!

IMG_5117Underwater Propeller polishing has been performed for years on vessels all around the world.  Subsea Global Solutions maintains global Propeller and Hull Maintenance agreements in place with several companies that focus on maintaining their propellers and Hull coatings at their best possible condition at all times.   By utilizing a multi-stage polishing process and diver / technicians trained in proper analysis of the propeller condition, Subsea Global Solutions’ process has proven to be an integral part of a fuel efficiency program.  The Benefits of maintaining a polished propeller have been known for years, but what has not been known is “how smooth is smooth”?  The industry standard is to use a Rupert scale to visually evaluate the surface roughness of propeller blade.  This is a very subjective measurement technique but the only one economically available since most propeller blades are fabricated from non-ferrous metals and are completely submerge underwater; making the available technology to measure surface roughness impossible.  Everyone advertises the ability to deliver a Rupert “A” quality polish on the propeller, but what does that mean?  Is it really possible to do?  Well, Subsea Global Solutions together with one of it’s OEM partners ventured out to take the mystery out of the question..

foto 3New Propellers are typically delivered with a surface roughness in accordance with ISO standard 484.  Propellers are delivered to either a Class “S” or Class “I” standard which equates to surface roughness between1.5 and 6 microns.  Measurement is done with an electronic roughness gauge calibrated with a certified piece of reference steel.  When propellers are polished underwater people advertise that they are polishing the propeller blades to a Rupert “A” roughness which equates to a surface roughness of 0.65 microns!  Is this really achievable????  Since there is no available technology to measure the surface roughness underwater the only way to evaluate the roughness is to visually compare the polished surface to a reference gauge.  Subsea Global Solutions decided to determine the actual surface roughness in microns once our multi-stage propeller polishing process was performed.   So testing commenced at Subsea Global Solutions’ European office.

Propeller Measurement layout fieldSubsea Global Solutions demonstrated the multi-stage propeller polishing process in April 2014 and measured the surface roughness during appropriate intervals during the polishing process.  This measurement was done by taking the blade in and out of our test facility at our facility in Europe.  Subsea Global Solutions’ goal of the test was to demonstrate the process, equipment and time required to achieve a propeller surface roughness equivalent or LESS than Rupert A in microns (<= 0.65 microns).  Testing was done in cooperation with Wartsila Propulsion The Netherlands and measurements were taken by and in accordance with their OEM guidelines.

IMG_5116A Ni-AL Bronze propeller blade was tested.  The Surface roughness measurements were taken prior to start of polishing and the propeller was fully assessed by the diver / technicians from Subsea Global Solutions.  At specified intervals during the multi-stage polishing process, the propeller blade was brought out of the test tank and the surface roughness was measured at appropriate locations.  Polishing was performed over a reasonable amount of time.  After a short period of time we were astonished to note that achieved a surface roughness LOWER THAN 0.2 MICRONS!!!!  That is 3 times better than Rupert “A”!

foto 4The conclusion’s are that using our multi-stage propeller polishing process we are able to achieve a smoother surface than Rupert “A”.  Subsea Global Solutions learned that our propeller evaluation process is the key to achievement of a super polish on the propeller since the selection of pad type and time interval of use will significantly influence the speed and quality of the work.  We also learned that it takes some time to “condition” the propeller to super polish level, but once “conditioned” the propeller surface is easy to maintain if maintained with the Subsea Global Solutions multi-stage polishing process.

So, there is a lot of science and technique that goes into a propeller polish.  Subsea Global Solutions- your trusted resource for unrivaled service!

Tunnel Thrusters- Repairs and Exchanges by the Handful!

SSA Flexible cofferdamAll 8 Subsea Global Solutions locations in Europe, the Americas and the Caribbean were busy repairing or replacing tunnel thrusters all around the world. Tunnel thruster removals took place in Europe (2), in the South Pacific Islands (1), on the West Coast of the USA (1) and in the Caribbean (1).  Two tunnel thrusters were installed in the Caribbean and several thruster repairs were performed in both wet and dry hyperbaric environments.

Tunnel thruster repairs were executed on several units on both commercial ships and cruise vessels.  7 tunnel thruster repairs took place over the past couple of weeks.  These repairs included a tunnel thruster shaft seal repair, blade seal replacements, CPP blade replacements, blade bolt replacements and weld repairs to permanently repair cracks and to install rope guards.

DCIM100GOPROTunnel thruster propeller blade, CPP blade seal and blade bolt replacements took place in a dry hyperbaric environment using SGS’ flexible dry door technology.  Properly spaced and rated attachment points were welded into place using Subsea Global Solutions class approved “A” class wet welding procedures. All wet welds were performed by certified welder / divers so that “rated” attachment points could be utilized.  With the fit for purpose and design rated flex door system installed the tunnel thruster tunnel was efficiently de-watered and repairs were completed efficiently.  No delays or changes to any vessel’s schedules took place during these repairs.

Wet tunnel thruster repairs were performed on several units to keep them operational and within the class acceptance criterion.  One tunnel thruster exhibited oil leakage from its bellows type shaft seal while in operation.  After consultation with the thruster manufacturer and seal supplier, a specialized adapter ring was engineered, fabricated and installed by Subsea Global Solutions.  With this fit for purpose ring installed the leakage stopped and the thruster could be put back into operation.  Allowing the vessel to remain coast guard compliant and in service is what makes Subsea Global Solutions’ the trusted resource for fleets around the globe.

Tunnel thrusters remain a critical and cost effective solution for large container and cruise vessels entering our congested harbors around the world.  Their proper operation is required and as such Subsea Global Solutions rises to the challenge of our clientele to keep them in service day in and day out.

Underwater Shaft Seal Renewal- Here There and Everywhere!


Subsea Global Solutions has been very busy providing support to our clientele in all locations around the world. In the past couple of weeks a shaft seal has been replaced on a cruise vessel while it was cruising on its Mediterranean itinerary.  Without taking the vessel out of service and with only minimal enhancements to the vessel’s itinerary the affected face seal as well as lip ring shaft seal system was exchanged in a dry hyperbaric environment underwater.

Subsea Global Solutions Europe performed the preparatory work on the vessel by removing the rope guard in a safe and efficient manner.  By using a carbon arc gouging system, the existing welds securing the rope guard to the vessel were gouged away and the rope guard was released from the vessel with no alteration.  Rigging pad eyes and specialized adapter rings were fabricated so that once the vessel arrived at its location for shaft seal exchange all was prepared and ready to go.

Subsea Global Solutions then mobilized additional trained and OEM certified diver / technicians from other Subsea Global Solutions locations located on East Coast of North America, West Coast of North America and the Caribbean.  As this was a very specialized seal with service being carried out by the OEM themselves, only OEM trained and certified personnel were allowed to perform this work.  Around the clock operations proceeded for 45 hours in order to exchange the specialized carbon faced seal ring, sealing seat and bond the necessary lip rings inside SGS’ specialized Flexible Hyperbaric cofferdam, the Transhab.  Since this sealing is so specialized and installation must be done in a controlled manner, Subsea Global Solutions certified their underwater exchange process together with their OEM partner last year through research and development performed both at the OEM’s production facility and at Subsea Global Solutions training and development center in Europe.

DSC01708With the shaft seal successfully exchanged within the required time frame, the vessel returned to its cruise through exotic Mediterranean locations assured that it’s shaft seal is guaranteed to provide years of good service.  Our commitment to excellence shines brighter and brighter as we continue to remain the industries gold standard for underwater service solutions.