New Class Rules Has Sounded The Death Bell For Oil-Lubricated Propeller Shafts, Says Thordon Bearings

January 22, 2016 (Press Releases)

Thordon Bearings has welcomed the introduction of a new classification society notation this week allowing extended inspection periods for propeller shafts using seawater-lubricated bearings.

DNV GL’s new voluntary TMON notation for open loop water lubricated propeller shafts follows similar rule revisions by Lloyd’s Register (LR), Bureau Veritas (BV) and the China Classification Society (CCS).

Thordon Bearing’s Commercial Director, Andy Edwards, said: “As long as certain condition monitoring criteria are met, DNV GL’s new rules mean that propeller shafts operating water-lubricated bearings no longer need to be withdrawn for inspection every five years. There will be no pre-determined intervals between shaft withdrawal surveys.”

“The five-year shaft inspection rules previously stipulated in most shaft condition monitoring notations were a major deterrent to the wider take-up of the water lubricated system, but now the world’s leading classification society has revised its rules we can present a viable and proven alternative to oil-lubricated propeller shafts.”


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No Wear For RiverTough After More Than 20,000 Hours In Abrasive Alaskan Waters

January 18, 2016 (Press Releases)

After nine years of operation in the harsh, abrasive waters of Alaska’s Yukon River, aboard Inland Barge Service’s push boat Ramona, Thordon Bearings’ RiverTough water-lubricated tail-shaft bearing system has emerged completely free of wear and tear.

The exceptional performance of the RiverTough bearings in waters renowned for their high content of gritty glacial silt came to light when the 16m (52.5ft) workboat’s cracked struts underwent repair in dry-dock.

Charles Hnilicka, the owner of Inland Barge Service Inc, said: “In the spring of 2011 we were doing some hot work on one of the struts and decided to change the bearing since everything was apart. We didn’t have to and could have reinstalled the original bearing after the hot work, but we had a spare set.

“When we took it out, the RiverTough bearing and sleeves had no appreciable wear and tear, which was amazing considering the environment in which the Ramona operates.”


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