Don’t Forget: Seawater is a Free EAL

By Maritime Reporter & Engineering News
Wednesday, December 11, 2013
Typical netting and rope around rotating shaft damages aft seal.

If your vessel is trading in U.S. waters, you need to be aware of the new oil to sea interface law that comes into effect on Dec. 19, 2013.  According to the new U.S. Environment Protection Agency Vessel General Permit (VGP), all vessels built on or after Dec. 19, 2013, must use an environmentally acceptable lubricant (EAL) in all oil to sea interfaces.  For all vessels built before this date, unless technically not feasible, ship owners must use an EAL in all oil to sea interfaces. Additional information on the EPA’s VGP can be found at http://cfpub.epa.gov/npdes/vessels/vgpermit.cfm#final.
Most ships use mineral oil to lubricate the propeller shaft, and the oil is contained in the stern tube by the aft seal – which is the oil to sea interface. In most cases, you cannot simply replace the mineral oil with seawater or other oil-based EAL’s. Oil-based EALs need to be compatible with the sealing materials to ensure leakage is controlled – shipowners will need to check with their seal supplier and it may be necessary to upgrade the sealing rings or upgrade to a new seal. Typically, costs of oil-based EAL’s are 3-5 times more expensive than mineral oils. If you are using an air seal, you are still required to use an oil-based EAL, as it is not possible to guarantee that oil leakage will never occur.
Still a concern for ship owners is that oil-based EALs are still considered a pollutant under the Oil Pollution Act of 1990 (OPA 90) and U.S. Clean Water Act (if there is a sheen). Any discharges of oil-based EALs still require reporting of the discharge to the U.S. Coast Guard, as well as having clean-up and remediation costs. Even though biodegradable lubricants may be deemed non-toxic by OECD testing, their presence on the water surface is a threat to seabirds.
For newbuildings, some ship owners are specifying seawater lubricated propeller shaft bearing systems, as more than 600 commercial ships are using a seawater-lubricated system that uses no oil – meaning full compliance with the VGP. (Some shipowners such as Princess Cruises, COSCO, Disney Cruise Lines, U.S. Gypsum Corp., CSL Group, Algoma Corp., Flinter Group, ConocoPhillips, Carisbrooke Shipping and Staten Island Ferries have chosen to use seawater as the propeller shaft lubricant.)
Currently, the U.S. EPA recommends that all newbuild vessel operators endeavor to use seawater-based systems for their stern tube lubrication to eliminate the discharge of oil from these interfaces to the aquatic environment.
Existing ships can be converted to seawater-lubricated propeller shaft systems as these systems typically fit in the same space as an oil lubricated system. The oil-to-seawter conversion is accomplished during a planned drydock where corrosion resistant shaft liners and a water lubricated forward seal were pre-ordered and the shaft and non-metallic bearings were ready for install when the ship drydocked.
So when it comes to discharges from a ships propeller shaft system, the shipowner that trades in U.S. waters has two choices for their existing ships and ships they plan to build: 1) replace mineral oil with an oil-based EAL to lubricate the metal bearings and ensure the seal is compatible with the EAL, or 2) convert or build a ship using a seawater-based system using non-metallic prop shaft bearings.      

By Craig D. Carter, MBA, Director of Marketing and Customer Service at Thordon Bearings Inc.

(As published in the November 2013 edition of Maritime Reporter & Engineering News - www.marinelink.com)

Maritime Reporter August 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Environmental

Halliburton to Settle US Gulf Spill Claims for $1.1b

Halliburton Co said it reached a $1.1 billion settlement for a majority of claims against the company for its role in the BP oil spill in the Gulf of Mexico in 2010.

Panama Canal Generates VER Carbon Credits

The Panama Canal Authority (ACP) informs it has certified Verified Emission Reductions (VERs) or carbon credits, within the framework of the Sustainable Forest

Fortum Buys Stake in Wave Power Startup

Finland's top utility, state-controlled Fortum, on Monday said it has acquired a 14 percent stake in Finnish wave energy developer Wello. Wello has developed

Fuels & Lubes

Joe Barton: Lift Oil Export Ban

A senior U.S. Congressman from Texas has come out in full support of the United States lifting the 40-year old ban on crude oil exports, putting him at odds with

Brent Crude Slips Towards US$102

Brent crude fell towards $102 a barrel on Tuesday on concerns of slowing oil demand growth due to weak economic recoveries in China and Europe, although new unrest

A Boost for UK Offshore Drilling? DW Monday Muses

Drilling activity offshore UK is now expected to increase over the next few years as government and industry reacts to the recommendations in Sir Ian Wood’s report

Marine Equipment

Two MCS Exhaust Gas Boilers to Tersan Shipyard

Parat Halvorsen AS has been awarded new boiler plant contracts for two freezer trawlers to be built at Tersan Shipyard located in Telova, Turkey. The boiler plants are for Tersan¹s newbuildings No.

Tankship-specific Version of FindaportCD Released

Harbour & terminal information providers, Shipping Guides Ltd, says its latest tanker-specific  addition enables customers to access the most comprehensive port

VIKING Steps Up Pace of Innovation at SMM

This year’s SMM in Hamburg will see VIKING release more innovations than at any other point in its 50-year history, including new developments in PPE clothing,

Vessels

Rickmers-Linie Appoints Interliner Agencies

Hamburg based Rickmers-Linie has appointed Interliner Agencies as its new agent in South Central Europe. The agency contract covers Slovenia, Austria, Czech Republic,

Gibdock Rreputation Rises in German Market

Gibdock has continued to see its stock rise amongst the German shipowner community over the past year. Indeed the Gibraltar ship repair yard’s recent client list

ClassNK's Noboru Ueda Attends KOTC Delivery Ceremony

Mr. Noboru Ueda, Chairman and President of ClassNK attended the delivery ceremony for the M/T Al Yarmouk, constructed at Daewoo Shipbuilding & Marine Engineering Co.

 
 
Maritime Security Maritime Standards Naval Architecture Offshore Oil Pipelines Port Authority Ship Electronics Ship Repair Shipbuilding / Vessel Construction Sonar
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1811 sec (6 req/sec)