New Class Rules Has Sounded The Death Bell For Oil-Lubricated Propeller Shafts, Says Thordon BearingsJanuary 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are met, DNV GL’s new rules mean that propeller shafts operating water-lubricated bearings no longer need to be withdrawn for inspection every five years.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.”