The additive chemistries found in traditional marine diesel cylinder lubricants may not suffice for the challenges of handling VLSFO blends, said US-based Lubrizol Corporation in a new white paper, after extensive research into new fuels.
DNV GL, together with marine insurers The Swedish Club, Norwegian Hull Club, Skuld and Gard have completed a study of the properties of environmentally acceptable lubricants (EALs) for stern tube applications, in response to the growing number of stern tube bearing failures recently. In fact, DNV GL sponsored lab tests demonstrating that EALs behave differently than traditional mineral oils under transient pressure and temperature conditions.
Chevron Marine Lubricants published its new white paper ‘The 2020 Global Sulphur Cap and the role of cylinder oil lubricants’, exploring the impact of vessels burning fuels with differing sulphur contents to heavy sulphur fuel oil cylinder oil use. The paper also provides recommendations from Chevron’s experts on how to manage the transition between cylinder oils pre-and post-2020.
Marine lubricant choices to address IMO’s 2020 sulphur cap must be based on verifiable cylinder oil performance data and engine testing to cover all operating conditions, argued the new General Manager of Shell Marine, Joris Van Brussel.
As the sulphur cap implementation is imminent in less than 18 months, operators need to worry about many issues as well, other than fuel selection only. In fact, IMO’s decision to implement a 0.50 per cent cap on sulphur emissions has created uncertainty amongst vessel operators, notes Mr. John LaRese, Marine Fuels Technical Advisor, ExxonMobil who discusses the needs for lubricants and fuel switching.
Shell Marine’s post-2020 cylinder oil expectations are based on a defined position on marine fuel use after the IMO’s cap on sulphur content comes into play, explains Shell Marine Global Technical Manager, Dr Sara Lawrence.
Many operators consider environmentally acceptable lubricants a cure to meeting environmental regulations. However, their performance as a propeller shaft having lubricant has come under scrutiny.
Classification society DNV GL launched a new joint development project with marine insurers The Swedish Club, Norwegian Hull Club, Gard and Skuld, to test the potential influence of Environmentally Acceptable Lubricants on failures in stern tube bearings.
Many vessels that are using these alternative fuels are dual-fueled, meaning that they have engines able to run either on a higher sulphur conventional fuel or on a virtually zero sulphur content alternative fuel, resulting in more extreme operating conditions within the engine.
Shell Marine has been awarded COSCO’s largest marine lubricants order in 2017. This order will include the full range of marine lubricants and technical services for seven out of COSCO SHIPPING’S 10 new generation Ultra Large Container Carriers.
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