USCG Issues Prototype Shaft Seal Warning
The U.S. Coast Guard (USCG) identified a safety concern after a prototype component used in a mechanical shaft-seal system failed onboard a USCG inspected deep draft vessel.On February 19, 2025, a U.S. flagged crude-oil tanker transiting near Delaware Bay experienced simultaneous failures of its port and starboard shaft seals, resulting in substantial seawater ingress.The crew deployed emergency collars supplied by the seal manufacturer and used the vessel’s emergency bilge system…
IACS Publishes UR on Synthetic Materials in Propeller Shaft Bearings
The International Association of Classification Societies (IACS) has published a new Unified Requirement, UR M85, providing comprehensive technical guidelines for type approval testing of synthetic materials used in aftmost propeller shaft bearings.Recognized as a critical component of a vessel’s propulsion system, these bearings are essential for long-term operational safety and efficiency.The new UR M85 establishes a robust framework for type approval testing to address what it says is a vital gap in maritime standards.
Demand for Maritime Shaft Generators Increasing
30 years ago shaft generators with PTI capability kept container ships sailing at top speed. That purpose gone, PTI/PTO is making a new comeback in more cargo shipping segments, this time for reducing emissions.Retrofitting a shaft generator is not an insignificant undertaking. Around 50 tons of equipment needs to be installed into the engineroom through a hole in the hull. A new section of shaft is usually required.That a few shipowners are undertaking such projects - Klaveness Combination Carriers on the Ballard…
Thordon Bearings and Wärtsilä Promote Stern Tube-Less Ship Concept
Thordon Bearings and Wärtsilä have announced the formation of the Blue Ocean Alliance to develop and promote a stern tube-less ship concept.The Blue Ocean Alliance brings together Thordon Bearings, Wärtsilä, the School of Naval Architecture & Marine Engineering of the National Technical University of Athens (NTUA), naval architect SDARI (Shanghai Merchant Ship Design & Research Institute CSSC) and ABS.The companies say that the concept of a ship design that does not require a…
ABS AIP for "Sterntube-less" Ship
Thordon Bearings said ABS issued an Approval in Principle to the “sterntube-less ship” concept developed in cooperation with the Shanghai Merchant Ship Design & Research Institute (SDARI), the National Technical University of Athens (NTUA) and Thordon Bearings Inc.The design replaces a vessel’s sterntube with an irregular shaped chamber that allows a shorter, water-lubricated propeller shaft to be inspected and maintained while the vessel is afloat, without having to withdraw…
Thordon Bearings Unveils New Water-lubricated Shaft Seal
Thordon Bearings has debuted a new propeller shaft seal for the commercial shipping industry featuring a unique Safe Return to Port (SRTP) design.Completing the COMPAC open seawater lubricated propeller shaft bearing system, Thordon's new BlueWater Seal is described by the manufacturer as a cost effective, commercial grade axial lip seal specifically designed for merchant shipping fleets. It incorporates Thordon’s emergency SRTP capability, first used in the company’s TG100 and…
