MAN B&W Engines Set Sights on Tier-II Limits

Tuesday, September 21, 2010

At the beginning of 2010, MAN Diesel & Turbo launched the first so-called “Tier II fuel optimization” for a limited number of MAN B&W low speed diesel engines.

The company has now looked at its complete engine program and investigated if the same SFOC reduction could be achieved. Against this background, it has been established that SFOC can be lowered by 1-2 g/kWh for a number of engines, while still complying with Tier-II NOx limits.

In the first release of the MAN B&W Tier II Engine Program, the SFOC on mechanically controlled engines had increased by up to 6 g/kWh (MC & MC-C), whereas the electronically controlled engines, designated ME, saw a fuel penalty of only up to 4 g/kWh, thanks to the much better possibilities on the ME types for adjustment and control of the fuel injection and the opening/closing of the exhaust valve.

These new, Tier-II SFOC reductions are obtained through a combination of several factors depending on engine type, such as:
•    increased scavenge-air pressure
•    reduced compression ratio (two-stroke Miller timing)
•    increased maximum combustion pressure
•    adjustments of compression volume and design changes

In order to distinguish between the different IMO Tier-II versions of fuel optimization, another number is introduced after the Mark designation, whereas the IMO Tier-I engines have no additional number, that is:
•    S80ME-C8/9 = original Mk 8/9 engine that complies with Tier I
•    S80ME-C8.1/9.1 = original Mk 8/9 engine that complies with Tier II
•    S80ME-C8.2/9.2 = the new fuel-optimised version that complies with Tier II
 

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

Marine Propulsion

Fishing Vessels Fit with Wärtsilä’s NOx Reducer

Wärtsilä said its new NOx Reducer will be fitted to two new fishing vessels under construction at the Celiktrans yard in Turkey. The ships are owned by HB Grandi,

NCL Spotlights Eco-Smart Cruising Program

On Earth Day, Norwegian Cruise Line NCL) celebrated key achievements from the past year that, as a part of its Eco-Smart Cruising program, help preserve the world's oceans.

Cruise Industry Highlights Environmental Efforts

In commemoration of Earth Day, Cruise Lines International Association (CLIA) today highlighted the extensive efforts of the cruise industry and CLIA member lines

Environmental

RINA Launches Notation for Eco-ships

International classification society RINA has launched a new voluntary notation to clearly identify new ship designs which meet eco-ship criteria. The Efficient

Fishing Vessels Fit with Wärtsilä’s NOx Reducer

Wärtsilä said its new NOx Reducer will be fitted to two new fishing vessels under construction at the Celiktrans yard in Turkey. The ships are owned by HB Grandi,

Ill-Considered Energy Policies Threaten US Navy: Report

The United States government has pursued energy policies based on “the mistaken belief in the unproven science that claims carbon dioxide (CO2) emissions from burning

 
 
Maritime Careers / Shipboard Positions Maritime Standards Naval Architecture Navigation Pipelines Pod Propulsion Port Authority Ship Simulators Sonar 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: 0.1048 sec (10 req/sec)