Zero Pollution Solutions for Age Old Problems A Return to Seawater - - PowerPoint PPT Presentation
Zero Pollution Solutions for Age Old Problems A Return to Seawater Lubricated Propeller Shaft Bearings NAMEPA Conference Compliance, Cost, and Competency in America Posidonia, June 5, 2014 Overview Oil discharges from ships
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1 Data related to Propulsion systems, IHS Fairplay database 2 Etkin, Dagmar Schmidt. Environmental Research Consulting “Worldwide Analysis of In-Port Vessel Operational Lubricant ,” Arctic and Marine Oilspill Program Technical Seminar of Environment Canada, 8 June 2010, Halifax, Canada
§ Seal must leak to lubricate its sealing lip § Oil pollution from leaking shaft or pod seal
§ Repair cost for seal damage is significant § Escalating detection and enforcement
§ Increased expectation of corporate
responsibility
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“Oil consumption from the seal is controlled to the minimum acceptable to maintain an acceptable life, but by design it is essential to have oil at the mating surfaces.” “Oil consumption is always lost direct to the sea so contaminating the environment.”
Source: Higgenbottom, Adrian. Wartsila Propulsion (Bearings & Seals) UK, “Coastguard Non-Polluting Sterntube Sealing System,” presented at the RINA International Conference for the Design and Operation
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“In stern tube bearings, the radial movement of the shaft is considerably larger than that of bearings for general industrial
rough seas and vibration are considerable. It is impractically impossible to seal the stern tube oil
issues in medium and large commercial vessels is stern tube oil leakage.”
Sada, Hiroyuki, Seiji Yamajo, David W. Hawkins and Tsuyoshi Kawazoe. Kobelco Eagle Marine Engineering Co. Ltd., Japan, “An Environmentally Compatible Lubricant for Stern Tube Shafting and Bearing Systems,” presented at the 11th Shafting Symposium of the Society of Naval Architects and Marine Engineers, Sept. 12-12 2006, Williamsburg, VA, U.S.A., pp 1.
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“Total annual inputs of lubricating oil worldwide from stern tube leakage and other operational discharges into port waters is estimated to be between 37 million to nearly 61 million litres. If the same rates of discharge occur at sea as they do in port, the estimated worldwide annual inputs of lubricants to marine waters both in ports and harbours and at sea might be estimated to be about four times the port estimate. This assumes that each vessel spends, on average, three days at sea for every day in port. Total worldwide use of lubricants from operational leaks and discharges would then be about 130 million to 244 million litres annually.
Etkin, Dagmar Schmidt. Environmental Research Consulting “Worldwide Analysis of In-Port Vessel Operational Lubricant ,” Arctic and Marine Oilspill Program Technical Seminar
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3 Smith, Andrew, Lloyd’s Register Global Technology Leader-Engineering Systems .,
“Shaft Alignment Problems Analyzed,” Marine Engineers Review April 2009, pp. 16
11 http://www.epa.gov/npdes/vessels
§ Ban on "any discharge into the sea of oil and oily
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lignum vitae seawater lubricated bearings
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Video
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NO AFT SEAL!
§ Oil-based EAL’s are still considered a pollutant under
§ Any discharges of oil-based EAL’s still require
§ Even though biodegradable lubricants may be
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http://www.simplexturbulo.com/2013/07/12/vessel-general-permit-latest-news/
21 Air control unit Air source (Control Air) L.O. tank unit Float switch Stern tube Stern tube L.O. pump unit
Filter Pump
Drain collection unit Flow meter Air Oil
Slight amount of air is leaked from here.
Aft seal
Cooler
Needle valve
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NO AFT SEAL!
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Grand Princess equipped with COMPAC since 1998
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