Marine Log - May 2008 - (Page 28)

DIESELTECHNOLOGY Typically, a round trip that normally would last eight weeks is allocated nine, leaving more time and a reduced shipspeed demand. Two very important issues must be considered: 1) Main-engine ability to operate at low loads for long periods of time. 2) Fuel-oil consumption at such low loads. For newbuilding projects, operators must decide whether the vessel should be laid out for high ship-speeds, as has been the case for a number of years, or whether they should choose an alternative design for lower ship-speed, that is, choose a smaller main engine. A further, third option is to keep the full-size engine in the specification, but to optimize it for lower loads. So far, says MAN Diesel, owners have chosen to maintain service flexibility by retaining the existing high ship speed. MAN Diesel says that electronically controlled ME/ME-C engines have an inherent, major advantage with respect to operating at even very low loads for indefinite periods of time. ICE CLASS TANKERS They also offer a substantial reduction in fuel-oil consumption compared to conventional engines at such low loads. In terms of fuel-oil consumption, it is important to note that with the emission legislation (Tier 2) coming into force for vessels with keels laid after January 1, 2011, ME/ME-C engines Reduced fuel consumption at low load operation for large comply with the leg- container vessels with MC/MC-C and ME/ME-C engines islation with a minimal fuel-oil consumption penalty. high-load periods to clean the gas ways. MAN Diesel says that electronically ME/ME-C engines also comply with controlled ME/ME-C engines offer better IMO Tier 2 legislation with a lower possibilities for long-term operation at SFOC, and thus a lower CO2-emission, low loads while, at the same time, giving than their mechanical counterparts. an improved fuel-oil consumption. This is The take-away from all this is that due to their better, part-load fuel con- high fuel prices and stricter emissions sumption and the ability of ME-engines limits are going to jump-start the adopto run at low load with less frequent tion of electronic controls. ML SERIOUS AIR FOR SERIOUS PLACES Confined Space Air Ventilators 8”, 12” & 20” Models Portable Lightweight 848-8000 CFM, 110/220V 12V DC Pneumatic Americ Corporation 785 Bonnie Lane Elk Grove Village, IL 60007 For more information, call 800-364-4642 or Fax 847-364-4695 www.americ.com 28 MARINE LOG MAY 2008 www.marinelog.com http://www.heisco.com http://www.americ.com http://www.heisco.com http://www.americ.com http://www.marinelog.com

Table of Contents Feed for the Digital Edition of Marine Log - May 2008

Marine Log - May 2008 Contents Editorial Second Thoughts Update Inside Washington Europe Plots Its Tech Strategy SDNV Container Ship Update Diesels Can Burn Anything: Even Clean Fuel Boost for Small Shipyards Gateway to the Caribbean Room to Grow Show Review Tech News Newsmakers Contracts Events Website Directory ML Buyer's Guide ML Marketplace Maritime Salvage Letters

Marine Log - May 2008

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.