Monthly Archives: June 2013

Shaft Seal Replacement- Any time and Any Where

DSC02693While cruising the Mediterranean Sea a cruise vessel encountered excessive water leakage on one of its propulsion shaft seals.  Considering the severity of the situation, the client contacted Subsea Global Solutions to dive into action.  Maintaining specialized equipment in various locations throughout the world and maintaining fully certified diver / seal technicians on staff, a full compliment of qualified personnel and equipment was efficiently dispatched to the vessel.

Subsea Global Solutions’ operations team worked together with the vessel’s superintendent and operations staff to develop a time line for this repair to ensure the vessel would remain in service and NOT be delayed in any port of call.  This required Subsea Global Solutions to stage the gear prior to the vessels arrival.  Upon its arrival into a port in Italy, Subsea Global Solutions performed all of the preparatory work necessary to support the shaft seal renewal.  This preparatory work included the removal of the rope guard using a carbon arc gouging system.  By using this advanced technology to remove the rope guard, minimal prep work is required to reinstall the same rope guard since the cut line is clean and straight.  With the preparatory work being performed in advance of the actual repair, this minimized the required time needed to renew all of the affected propeller shaft seals.

DSC01708Upon the vessel’s arrival in Malta, Subsea Global Solutions’ team of expert diver / technicians dove into action.  The specialized flexible hyperbaric cofferdam, Transhab, was installed over the affected propeller shaft seal.  With the space properly de-watered and sheltered from the sea, a factory authorized and class approved renewal of the shaft seals took place.  All oil and water lip rings were removed, the seal housings were cleaned, liner was inspected and new oil and water lip rings were “vulcanized” using OEM approved jigs, glues and procedures.  With all the lip rings renewed the oil system was air tested, pressure tested and properly filled.  The water lip rings were assembled around the propeller shaft, air tested and pressure tested.  Subsea Global Solutions completed the job in Malta in less than 48 hours by re-installing the rope guard utilizing the groups class “A” wet welding procedures.  Diver / Welders coded to Subsea Global Solution’s class approved class “A” wet welding procedures performed the welding on this critical component.  By using coded underwater diver / welders to perform this weld repair ensures that at the conclusion of the repair there will be no notation from class on the rope guard weld repair performed.  The vessel departed Malta on time with a happy crew and happy passengers!

Subsea Global Solutions delivers unrivaled service to keep your vessels in service.  We remain the trusted service provider to the cruise industry in all ports of call around the world.  We always remain available 24 hours a day and 7 days a week to support your needs.

Class “A” Wet Welding- When only the best will do-SGS delivers!

Subsea Global Solutions continues to invest in the development of personnel.  With a full time / fully employed work force of Diver / Technicians and 3 training facilities strategically situated around the Welding class 2world, Subsea Global Solutions is able to maintain a consistent workforce of best in class certified underwater wet Diver / Welders.  Subsea Global Solutions has pioneered the development and certification process of its wet welding procedures in order to achieve class “A” quality wet welds each and every time.   Subsea Global Solutions Diver / Welders are coded to this proprietary procedure in four positions with five classification societies- ABS, LR, DNV GL and BV.

An “A” class wet weld is the highest quality weld classification as outlined by the American Welding Societies’ (AWS) D3.6M: 2010 Underwater Welding Code; the current industry standard for wet and dry Hyperbaric welding.  Class “A “ welds have the comparable metallurgical properties to above Welding class 3water welds.  Most Diver / Welders are able to achieve AWS D3.6M: 2010 Class “B” wet welds- which can be used for less critical applications The final classification of AWS D3.6M: 2010 is an “O” class weld which must meet the requirements of a different code or standard (outside of AWS D3.6M), defined by the customer.  Delivering consistent wet welds that meet the same NDE and metallurgical properties, as an equivalent “Topside” weld requires highly skilled personnel, an advanced training curriculum and detailed procedures.  The same metallurgical properties mean that strength, hardness, ductility, elongation and other properties of the wet welded connection is equivalent to topside weld welded completely dry.

Welding class 4Subsea Global Solutions is pleased to announce that we have qualified an additional 8 diver / welders to this stringent code in various weld positions.  This brings our total count of coded “A” class wet welders to greater than 45 world wide with more and more to come.  Representatives from the following major classification societies witnessed qualification welding: American Bureau of Shipping (ABS), Det Norske Veritas (DNV), Germanischer Lloyd (GL) and Lloyd’s Register (LR).   Solutions is in our name and welding is our game, so let us apply these advanced welding alternatives to your vessels.  Adding more coded class “A” wet welding personnel to our game gives us the flexibility to deliver the unrivaled service you expect from the market leader in underwater ship repair and maintenance.

When the Anchor Swings the WRONG way…….

Parker - shell 2An incident occurred on a vessel transiting into the West Coast of the USA.  The anchor chain block failed causing the anchor to slip downward.  With the vessel steaming ahead to port, the swinging “projectile” with barbed points pierced the hull on multiple locations above and below the waterline as it slowly slipped into the sea.  With no other choice, the crew released the anchor to the sea causing it to be lost forever in the Pacific.  Once the vessel arrived on the West Coast of the USA, Subsea Global Solutions was called into action.

Parker - shell


With personnel and gear mobilized from our Los Angeles / Long Beach, USA office, Subsea Global Solutions assessed the extent of the damage above and below the water line.  Considering the work that was required at multiple elevations along the ship’s shell plating an atmospheric cofferdam was developed by the engineering department of Subsea Global Solutions and fabricated on site by Subsea Global Solutions’ diver / welders.

With the cofferdam properly fitted aParker - shell 3nd dewatered, a permanent repair could be executed in accordance with class requirements.   Properly engineered and fabricated insert plates were efficiently welded into place utilizing class approved welding techniques and coded topside welders.  Wasting no time and minimizing the delay to the vessel, Subsea Global Solutions and it’s local partners worked around the clock to return the vessel into service.

From initial inspection to final video, Subsea Global Solutions remained the clients trusted resource to deliver a fast, cost effective and quality repair.  We are your resource to maintain your vessels in service. Subsea Global Solutions remains ready to patch up the damage however it is caused!  Let us know what we can do to support you!


Studies and proven experience show that propellers fitted with Propeller Boss Cap Fins (PBCF’s) contribute towards higher propeller efficiency and propulsion system performance. This means an immediate reduction in fuel consumption; generating an almost immediate payback for the equipment and installation cost for the PBCF’s. And let’s be honest now, everyone wants to save money right? The payback period for the investment is short and the upgrade can be performed completely underwater; typically in one 12-hour port stay.  With all of these benefits in mind one of our global customers is looking at changing the boss caps on as many of their vessels as possible.  Subsea Global Solutions remains the turn to company for delivering unrivaled service for this client performing this work typically during normal port stays without vessel itinerary interruption.

OLYMPUS DIGITAL CAMERAAfter searching for the right time frame in the vessels schedule, our Caribbean office was able to plan the installation of a PBCF at the Maintenance Anchorage of Aruba.   Aruba’s maintenance anchorage is a suitable location for vessel maintenance and repair but consideration of the weather and sea conditions is critical at this semi-sheltered location.  With all weather updates on hand, the Subsea Global Solutions team mobilized to the vessel.

The Subsea Global Solutions engineering department developed an in-water procedure for the installation of PBCF’s in a minimal 12-hour period. This procedure is consistent with the Original Equipment Manufacturers “dry” installation process while a vessel is in dry dock.OLYMPUS DIGITAL CAMERA Except that the work is done completely underwater without any adjustments to the vessels draft.  Following this procedure, the existing propeller boss cap was removed and brought to the surface. Subsea Global Solutions diver / technicians then prepared the propeller for the installation of the new unit.  Once prepared, the team properly fit the new propeller boss cap with wake field stabilization fins.  Upon completion, the bolts were torqued to their proper specification and underwater epoxy was applied to fair in the bolt holes as required.

To make the stop even more cost effective for the client, Subsea Global Solutions performed a complete hull cleaning at the same time without delays. Both the cleaning and the propeller improvement delivered immediate results and gave the client the immediate pay back they were looking for. Developing underwater processes for efficiency improvements that conform to vessel’s schedules is what makes the Subsea Global Solutions the underwater service company of choice.  We focus on your vessel’s schedule and your specific needs. So who’s next?