Cavitation erosion of weld seams in rudders in an inherent problem that plagues vessels around the world. Prior to now, the only remedy available that was recognized by class societies was to perform a dry atmospheric weld to the affected areas in the dry dock or engage Subsea Global Solutions to perform a dry hyperbaric weld repair based on our existing weld procedures. As announced earlier this year, Subsea Global Solutions recently gained approval for more wet welding procedures. Groove weld procedures were approved meeting the Class A requirements of the American Welding Societies specification AWS D3.6M:3010 – Underwater Welding Code.
Weld Seam Cavitation Erosion Damage
Weld seam restored by Wet Welding
Cavitation Erosion Damage restoration with wet welding
Utilizing the approved procedures, welder divers restored the affected weld seams on rudders on two vessels this past month thus allowing the vessels to remain in service. One vessel operating in the Cruise Industry and another vessel operating in the Container ship trade experienced considerable erosion of their weld seams in the rudder. With this excessive erosion, the class societies were forced to put a notation on the rudders and set time table for the execution of repairs in the dry dock. Since both vessels were far from their next scheduled dry docking period, Subsea Global Solutions was contacted to evaluate in-water options.
Repairs on both vessels were executed while they remained in service. By performing weld seam restoration with the wet welding process, the vessels could perform cargo operations at the same time that welder divers from Subsea Global Solutions completed the work efficiently without delaying any of the vessel’s schedules. Over sequential attendances, both repairs were completed to the satisfaction of the attending surveyor.
In both cases the erosion damage was considerable. Large sections of weld seam were eroded away in some areas with other smaller pockets of eroded weld seams were found in other locations on the rudder blades. The weld seams were restored with the parent metal using Hydroweld 3.2 mm mild steel electrodes. Once welding was completed, magnetic particle Inspections were performed to the restored areas and no linear indications were sighted.
Delivering unrivaled service starts with recognizing the need and adapting to fulfill the work completely, efficiently and cost effectively. Allowing a class recognized repair to be performed while these vessels remained in service, efficiently reduced the risk profile for class and the vessel owner.
Subsea Global Solutions Is your service partner for all in-water maintenance and repair. We remain available anywhere, any time.
Subsea Global Solutions is pleased to announce the opening of our new office in Livorno, Italy. Trident Italia Srl is a newly formed subsidiary of Trident BV, Subsea Global Solutions’ European founding member. With the addition of this new location, Trident BV is able to support the entire portfolio of services supported by Subsea Global Solutions on the Italian peninsula with local resources.
“This new location supports our philosophy to deliver rapid cost effective solutions through unrivaled service. We are proud to have local Italian presence in our new “fully equipped” home port location.”
– Adrie Huijbregts, Managing Director of Trident BV
Offices are located in Livorno Italy, and all equipment is mobile and can be easily transported to all suitable ports in Italy for any services in our Subsea Global Solutions portfolio.
Please feel free to contact:
Trident Italia Srl
Via delle Cateratte 84 int 16/17
Manager / Administrator: Richard Zoltowski
Phone: +39 05861751922
Fax: +39 05861752148
Subsea Global Solutions has remained very busy in early 2014 supporting several oil and gas clients with inspections, maintenance and thruster exchanges. Working both in-shore and off-shore, unique underwater solutions were developed for various semi-submersible and crane vessels to safely, efficiently and effectively complete the scope of work.
The exchange of large demountable azimuthing thrusters is a systematic process that involves close coordination between inboard operations, outboard operations and lifting services. This systematic approach is quite straight forward when performed in-shore in sheltered areas, but when performed almost 100 nautical miles OFFSHORE in the dead of winter, this systematic process takes on a new life of it’s own. Unique processes with built in redundancy, specialized fit for purpose equipment and a concrete communication plan need to be in place to keep the work moving forward efficiently and safely for all personnel in and out of the water. Developing a flexible dive plan with built in redundancy at all levels is essential when working in such conditions. Current, sea state and strong winds made the location challenging especially when rigging 75 ton thrusters into position! Subsea Global Solutions provided all dive operation management, personnel and equipment to provide around the clock diving operations from multiple dive platforms both on and off the semi-submersible. By remaining agile and able to adapt to the ever changing weather conditions, Subsea Global Solutions’ was able to provide continuous support for the thruster exchange process. This allowed all work to be completed to the full satisfaction of the owner; even after others failed.
Bringing experience and a can-do attitude within the entire organization from top to bottom is what makes Subsea Global Solutions unique when performing these large projects in the Oil and Gas industry.
Simultaneously in other parts of the world, Subsea Global Solutions was servicing two other oil and gas installations. One Drill Ship required a detailed Underwater Inspection in-Lieu of dry docking (UWILD) for class while the other vessel, a large crane ship, required the exchange of demountable propulsion azimuthing thrusters weighing approximately 60 tons. Both projects took place in the Caribbean. Operating efficiently within the time parameters and dive windows in accordance with both vessel operator’s stringent diving regulations has made Subsea Global Solutions the company’s “turn to” resource for all of their diving needs.
The Oil and Gas market is enjoying Subsea Global Solutions’ professionalism from start to finish. Delivering on its core values of quality and safety, Subsea Global Solutions has demonstrated that Quality Service is “not an Act but a Habit”. Additionally Subsea Global Solutions has demonstrated that Safety’s the “Golden thread woven into our culture”. Let us demonstrate all of our core values for you! We remain available at anytime to develop projects with you.
Stabilizers play in an important role on cruise vessels. They help keep the “cargo” from complaining and help keep the martinis on the table tops as the vessel cruises the high seas. However, when seals leak on the stabilizers, no one is happy. While operating in the Mediterranean, a stabilizer on a cruise vessel experienced excessive sea water ingress. This forced the unit to be taken out of service and housed. The Lube Oil system was contaminated with sea water causing concerns of mechanical damage to the Stabilizer drive system and concerns of oil release to the environment. With a full itinerary and no scheduled dry docking on the horizon the client contacted Subsea Global Solutions to evaluate options.
Subsea Global Solutions is the leader in the development of flexible Hyperbaric Cofferdams for various applications which require a temporary dry environment formed in a normally wet area of a vessel. Considering the seal type installed on this stabilizer and to perform a permanent Class and OEM approved repair, a Hyperbaric dry environment needed to be developed so that new seal rings could be installed. This required Subsea Global Solutions to engineer a flexible Hyperbaric cofferdam that would encapsulate the stabilizer seal pocket. With in-house engineering staff and specialized 3-D design and modeling software, Subsea Global Solutions engineered the necessary Flexible Hyperbaric cofferdam for this type of application. Since this repair has never been executed underwater before a proper engineered solution was required. Subsea Global Solutions together with the stabilizer and seal manufacturer evaluated the technical details of this repair and determined that a safe and efficient process of repair could be performed . Subsea Global Solutions is the preferred and approved underwater service company globally approved by the OEM to bond these seal rings underwater. With this in mind, a repair procedure was developed together with a detailed time line in order to perform the work without taking the vessel out of service or affecting the vessels itinerary.
In the port prior to the underwater intervention, Subsea Global Solutions loaded all of the gear onboard and set up the gear for the intervention. With the gear and dive station prepared in advance, immediately upon arrival to the repair port of call, diver technicians entered the water. Utilizing Subsea Global Solutions‘ “A” class wet welding procedures, all attachment points for the flexible Hyperbaric cofferdam were properly positioned and installed. Once the flexible Hyperbaric Cofferdam was installed, the diver technicians dewatered the space and went to work in a dry and controlled environment. The existing seal assembly was disassembled and the problem was immediately identified. Defective rubber seal rings were removed and brought to the surface for evaluation. With the problem isolated and new seal rings in hand, Subsea Global Solutions bonded the new seal rings in accordance with the OEM’s approved vulcanizing process. Utilizing the same bonding equipment, adhesives and process used in the dry dock by the OEM, Subsea Global Solutions performed the work with it’s factory trained and certified OEM diver technicians, Subsea Global Solutions completed the work without delay or schedule changes for the client. This repair was performed in accordance with the OEM’s approved process and received Class’ approval as the repair being considered permanent.
Start to finish, the team performed the entire seal renewal in less than the thirty (30) hour port stay of the vessel. This allowed the vessel to remain in service and not be delayed on it’s cruise. With the stabilizer back in service, the cargo could enjoy a nice smooth ride and the martinis stayed put! Making the impossible possible is what Subsea Global Solutions is all about. We remain on the forefront of developing new repair alternatives. Bring your problem to us and let’s see what we can develop for you!