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 Today


The Maritime Industry's original and most viewed E-News Service

Maritime Reporter May 2016 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Environmental

US Navy Updated Zika Virus Infection Guidance

Navy Medicine released updated Zika Virus Infection guidance in NAVADMIN 121/16, May 26, communicating current information, travel precautions, and risk reduction

Seaspan Acquires Eighth 14000 TEU Vessel

Seaspan Corporation (NYSE:SSW) announced today that it accepted delivery of a 14000 TEU containership, the YM Width. The new containership, which was constructed at CSBC Corporation,

GloMEEP Project Forges Ahead with Train-the-Trainer Workshop

A global Train-the-Trainer workshop on energy efficiency has been delivered in China (23-27 May), preparing the personnel needed to cascade knowledge on energy

Fuels & Lubes

WSS: Post-combustion Fuel Treatment Cuts Vessel Costs, Risk

Wilhelmsen Ships Service, a provider of products and services to the shipping industry, is advising vessel operators to wage war on soot. According to WSS, soot

EGAS: Egypt to tender for 10 LNG Cargoes

Egypt will tender next week to import 10 cargoes of liquefied natural gas (LNG) for delivery in July and August, an official from the state gas company, EGAS, said on Thursday.

ABB Saves 700,000 tons Fuel for Marine Vessels

ABB’s environmental friendly Azipod propulsion system brings greater fuel efficiency to diverse shipping segments ABB today announced the total fuel savings

Marine Equipment

Wärtsilä Electrical Systems for SIEM RoRo Ferries

Wärtsilä has been awarded the contract to provide integrated turnkey electrical solutions for four new RoRo ferries being built at the Flensburger Schiffbau-Gesellschaft (FSG) yard in Germany.

APM Terminals Bahrain Push for Safety, IT systems

Hidd, Khalifa Bin Salman Port, Bahrain - APM Terminals Bahrain, operators of Khalifa bin Salman Port (KBSP), has recently made significant advances in Safety performance

SRH Marine and Setel Powerline Pact for Greek Market

SRH Marine Electronics SA and SETEL PowerLine Ltd have entered a Reseller and Installation Partner Agreement.    Through this cooperation SRH is able to offer

Vessels

Greek Shipping – Still Number One!

Despite the many domestic and market challenges facing the Hellenic ship owning community, Greece has continued to strengthen its position as the largest ship owning nation in recent years,

Seaspan Acquires Eighth 14000 TEU Vessel

Seaspan Corporation (NYSE:SSW) announced today that it accepted delivery of a 14000 TEU containership, the YM Width. The new containership, which was constructed at CSBC Corporation,

Hansa Offenburg, Hansa Drakenburg Sail Scale-free

Leonhardt & Blumberg was founded in 1903 and has managed more than 180 vessels, the majority of which were general cargo vessels and bulk carriers. Today the company

 
 
Maritime Contracts Maritime Security Naval Architecture Navigation Offshore Oil Salvage Ship Repair Ship Simulators Shipbuilding / Vessel Construction Winch
rss | archive | history | articles | privacy | 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: 0.0972 sec (10 req/sec)