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Stern Tube

Mobdock Facilitates Onsite Underwater Ship Repair

hydrex mobdock.jpg

In February, Hydrex diver/technician teams carried out underwater stern tube seal repairs on a 139-meter container vessel in Port Everglades, Fla., close to the company’s office in Clearwater. The vessel was suffering from an oil leak, making a fast repair necessary. Using one of the company’s next generation flexible mobdocks the team was able to carry out the entire operation onsite and underwater, saving time and money for the owners. Hydrex said it constantly invests in the research necessary to continue to evolve repair techniques and procedures. Over the years the Hydrex R&D department has constantly improved the flexible mobdock (mobile mini drydock) technique to make it possible for Hydrex diver/technicians to perform permanent repairs on seals, thrusters and almost any other part of the underwater vessel without the vessel needing to go to drydock. Hydrex said its latest generation of flexible mobdocks allows it to carry out the replacement of virtually any type of stern tube seals very quickly onsite. These flexible mobdocks are stored at the fast response centers. Designed specifically to increase speed of service, these centers are equipped with all the latest facilities, lightweight equipment and tools. This allowed us to mobilize a team together with all the needed equipment to the container vessel’s location within the shortest possible time frame.

RSC Gear Oils Gain Blohm, Voss Approcal

Photo: RSC

RSC Bio Solutions EnviroLogic 210 and EnviroLogic 215 readily biodegradable and non-toxic gear oils have passed the stringent performance requirements of Blohm. After significant testing, in both static and dynamic evaluations, these synthetic, high-performance products have met the requirements for two of Blohm + Voss Industries’ patented Simplex-Compact sealing systems: the “Standard” Seal and the “Airspace” Nonpolluting Seal.

Iconic Schooner Fitted With Pollution-free Bearings

Bluenose ll: Photo credit Thordon Bearings Inc.

Nova Scotia’s sailing ambassador, 'Bluenose II', fitted with Thordon Bearings' water-lubricated stern tube & rudder bearings. Nova Scotia’s sailing ambassador, the Bluenose II, relaunched September 29, 2012 in Lunenburg, Nova Scotia fitted with pollution-free water lubricated stern tube and rudder bearings.  The extensive two-year $15.9 million restoration work was done by the Lunenburg Shipyard Alliance, made up of Covey Island Boat Works

Hydrex Underwater Repairs in Trinidad

Photo: Hydrex

Last month a Hydrex diver/technician team carried out underwater stern tube seal repairs on a 148-meter container vessel in Port of Spain, Trinidad. The ship was suffering from an oil leak, making an on-site repair necessary. Using one of the company’s flexible mobdocks the team was able to carry out the entire operation on-site and underwater, saving the owner an expensive and time-consuming trip to drydock.

Thor-Lube Bearing Receives Orders

Thordon Bearings Inc. of Canada recently received orders for environmentally friendly Thor-Lube sealed stern tube bearing systems for three LNG carrier newbuild projects in Korea and Japan. Daewoo Shipbuilding & Marine Engineering Co. Ltd ordered systems for two ships, one for Shell International Gas Limited and the second for the Australian LNG Ship Operating Co. (ALSOC). Mitsubishi Heavy Industries (MHI) of Japan ordered the third system for a second Shell newbuild

Emergency On-site Repairs Keeps Vessel Sailing

Photo courtesy of Hydrex

Hydrex offers fast on-site repairs in emergency situations. Its fast response team are ready to mobilize immediately to locations around the world for a wide range of operations.   There are many events that can stop a ship from sailing. Ships with a leaking stern tube are often not allowed to enter ports. A vessel can be tied up after a collision or a malfunctioning rudder can prevent safe maneuvering. Going to drydock is obviously not an option in such cases

Chevron Introduces New Line: Clarity Synthetic EA Oils

Chevron Products Company, a Chevron U.S.A. Inc. division, unveiled a new line of Clarity Synthetic EA Hydraulic and Gear Oils for the marine industry and other applications where leaks or accidental discharge are a concern. These products meet the new EPA Vessel General Permit (VGP) requirements for environmentally acceptable lubricants (EALs). Clarity Synthetic EA Hydraulic and Gear Oils are designed to give maximum protection and provide seal compatibility in hydraulic equipment and

Taiwan Ferry Propulsion Package Contract For MAN

MAN L32/44 Engine: Photo credit MAN

Lienchiang County Government of Taiwan ordres two 9L32/44CR four-stroke engines to power a inter-island new Ropax ferry. The medium-speed engines will form part of a complete propulsion system delivered by MAN Diesel & Turbo that also includes reversible gearboxes, MAN Alpha twin-screw fixed-pitch propellers and a ship alarm system.
 The 106-metre ferry will be built by Jade Shipbuilding, Kaohsiung, SW Taiwan and will travel six days a week between Keelung and the Matsu islands (an

Don't Forget the Diver: Avoid Drydock Repairs

Hydrex Logo

Hydrex reminds that their turnkey underwater repair solutions for shipowners can be done wherever and whenever they are needed. Hydrex’s multi-disciplinary team promises will help to find the best solution for any problem encountered with a vessel below the water line. They will immediately mobilize thier diver/technicians to carry out necessary repair work without the need to drydock. The company has a long track record of performing complex permanent underwater repairs to thrusters

BAE San Francisco Wins Navy Contract

BAE Systems San Francisco Ship Repair, San Francisco, Calif., is being awarded a $12,257,163 firm-fixed-price contract for a 55-calendar day regular overhaul and dry-docking of Military Sealift Command's dry cargo/ammunition ship USNS Alan Shepard.  Some of the major work items include dry-docking and undocking the ship, repairing interior decks, structural repairs, overhauling the main diesel generators, and inspecting and refurbishing the propeller shaft and stern tube

New Class Rules Favor Seawater Lubricated Props

Thordon Bearings’ seawater-lubricated propeller shaft bearing system meets classification society rules for extended shaft withdrawal periods (Image: Thordon Bearings)

Classification societies are changing their monitoring rules for seawater-lubricated propeller shafts in line with the rules governing the inspection and withdrawal of oil-lubricated stern tube systems.   China Classification Society (CCS), for example

Envirologic Gets Becker Marine Systems Approval

EnviroLogic 3032 hydraulic fluid and EnviroLogic 802 grease are certified as VGP compliant, technically feasible for marine industry   RSC Bio Solutions, a developer of environmentally acceptable lubricants (EALs) and cleaners, as well as 

Shear Stability: The Key to Proper EAL Gear Oil Selection

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Selection of gear oil for marine thrusters or a stern tube lubricant for use with propeller shaft bearings is often based on analyzing price/performance characteristics of the lubricant and its availability. Now with the implementation of the 2013 Vessel General Permit

Thordon Reports Big Orders from Chinese Shipyards

Photo: Thordon Bearings

Thordon Bearings has received an order for a total of 20 seawater-lubricated COMPAC Propeller Shaft Bearing Systems for Chinese shipyards, marking the Canadian company’s most significant order for commercial vessels. Thordon Bearings

Avance VLGCs Fixed

Image: Avance Gas

 Avance Gas said repairs of two very large gas carriers (VLGCs) are complete, allowing the delayed ships to get to work.   Both new build VLGCs recently dry-docked - Breeze (83,000dwt, built 2015) and Monsoon (83,000dwt, built 2015) - have completed warranty repairs related to

RCS' EAL Earns Additional Approval


RSC Bio Solutions announced that its EnviroLogic  802 environmentally acceptable grease has met the requirements for approved use in AEGIR-Marine PRIME rudderstock seals. This approval is an extension of the existing partnership agreement between AEGIR-Marine and RSC Bio Solutions intended

‘Seawater is the Ultimate EAL’

Cost comparison of stern tube lubricants (Image courtesy of Thordon Bearings)

Thordon Bearings: “Seawater is the only commercially viable EAL for propeller shafts”   Thordon Bearings Inc., a manufacturer of seawater lubricated bearings for the global marine industry, has questioned the rise of environmentally acceptable lubricants (EALs) in oil-based

Partnership Promotes Seawater Lubrication

Scott Groves (left), Business Development Manager at Thordon Bearings, and Leslaw Hnat (right), Chairman of the Board of MSR Gryfia, sign an agreement that affirms the companies’ efforts to convert ships to seawater lubricated propeller shaft lines from oil.

Thordon Bearings Inc. signed a letter of intent (LOI) under which it will cooperate with MSR Gryfia of Poland to promote the conversion of ships to an open seawater lubricated propeller shaft Thordon bearing system from a sealed oil lubricated propeller shaft bearing system.   

Making a Conscious Change: Seaspan Marine’s Conversion to EALs

Seaspan Marine has converted Royal’s stern tubes to RSC Bio Solutions’ EnviroLogic EAL. Photo credit: Seaspan Marine

Vessel fleets face an increasing number of environmentally focused regulations, adding complexity to their operations and creating urgency around compliance. The U.S. Environmental Protection Agency (EPA), under the Vessel General Permit (VGP)

Shell Launches Naturelle Stern Tube Fluid

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Shell has launched its new range of Environmentally Acceptable Lubricants (EALs), including Shell Naturelle S4 Stern Tube Fluid 100.   The Shell Naturelle range of products is designed to enable ships entering U.S. waters to comply with the revised 2013 Vessel General Permit (VGP). 

RSC Bio Solutions: SVGP Compliant Fluids & Cleaners

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RSC Bio Solutions said that its EnviroLogic Environmentally Acceptable Lubricants (EALs), including hydraulic, stern tube and thruster oils, and SAFECARE cleaners and their constituent components have been evaluated by independent laboratories to meet the U.S

Sinking Fishing Vessel and Crew Safe in Honolulu

The fishing vessel Pacifica moored safely in Honolulu Harbor Monday after taking on water when insufficient shaft packing in the stern tube allowed water to flood the vessel approximately 144 miles north northeast of Oahu, the U.S. Coast Guard (USCG) reported.

Vessel & Crew Safe in Honolulu


  The fishing vessel Pacifica moored safely in Honolulu Harbor Monday after taking on water approximately 144 miles north northeast of Oahu. The cause of the flooding was determined to be insufficient shaft packing in the stern tube, which allowed water to enter the vessel

Wärtsilä Propulsion Equipment for 2 Fishing Vessels

Lunar Fishing

  Two new 78 metre purser/trawler fishing vessels being designed and built at Karstensen Shipyard in Denmark will feature Wärtsilä's main propulsion and control equipment. The ships have been contracted by Lunar Fishing, the Scotland based fishing company and will operate in the

AEGIR-Marine Partners with On Site Alignment

AEGIR-Marine and On Site Alignment.jpg

AEGIR-Marine and On Site Alignment (OSA) signed a contract at SMM in Hamburg confirming the companies’ strategic alliance concerning stern seal and propulsion service and the alignment of propulsion shafting and bearings of seagoing vessels.

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