• 2018 January 17 15:04

    DNV GL launches new JDP to test biodegradable lubricants

    Classification society DNV GL has launched a new joint development project (JDP) in cooperation with marine insurers The Swedish Club, Norwegian Hull Club, Gard and Skuld to test the potential influence of Environmentally Acceptable Lubricants (EALs) on failures in stern tube bearings. DNV GL will oversee detailed laboratory testing of EALs by Leonardo Testing Services Ltd. at the University of Sheffield (UoS), UK.

    The JDP has been prompted by an increase in stern tube bearing failures over the last few years. This coincides with the increased uptake of EALs after the introduction of regulations requiring their use in commercial vessels trading in U.S. waters in 2013, but also with the introduction of new propulsion system designs, such as single stern tube bearing installations and larger and heavier propellers operating at lower RPM.

    The test programme will investigate such aspects as hydrodynamic oil film formation, oil film thickness under varying loads and temperatures, and potential shear thinning effects at high shear rates. State-of-the-art non-invasive ultrasonic techniques developed by UoS will be utilised to examine lubricant film behaviour in real-time.

    “DNV GL supports solutions that can reduce the environmental impact of the maritime industry. Our aim in this study is to undertake a first-hand assessment of the performance of EALs in order to guide the further development of the DNV GL Rules,” says Alnes. The first phase of testing will be completed in the first quarter of 2018, with the results scheduled for publication later in the year.


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