Diesel Switch Eliminates Fuel Changeover Problems

Monday, September 20, 2010
Image courtesy MAN Diesel & Turbo

With the recent introduction of stringent environmental regulations, such as those from the IMO, ship owners and operators are increasingly obliged to operate their MAN B&W two-stroke main engines on ultra-low sulphur fuels in defined marine zones. Furthermore, CARB (the Californian Air Resource Board) has enforced the use of diesel oils (MDO) or gas oils (MGO) in Californian waters since 1 July, 2009, while European harbours introduced similar requirements at the start of 2010. These new requirements ultimately mean more frequent, running changeovers in fuel type aboard marine vessels.

When entering/leaving such defined marine zones, the changeover from preheated HFO to cold MDO/MGO and vice versa represents a risk for fuel-pump sticking or seizure if not performed properly due to the very small clearances within fuel pumps. In response, MAN Diesel & Turbo has developed the Diesel Switch, building on its own patent, to handle this fuel changeover in a controlled way and avoid rapid temperature deviations and fuel-pump seizures.

In particular, the changeover between HFO and distillate fuels can be problematic for fuel equipment, with a high degree of automation necessary to avoid negative incidents. The Diesel Switch ensures the necessary flexibility and safety when changing between HFO and MDO/MGO and comes in two variants: for retrofits and newbuildings.

While MAN Diesel & Turbo currently recommends vessels to reduce loads to 25-40% before changing fuel type, the Diesel Switch retrofit enables a controlled and safe changeover independent of engine load. It does this through continuously checking temperature versus time. If the fuel temperature at the engine inlet exceeds 2 degrees/minute, the Diesel Switch emits an alarm and automatically halts the changeover process. 9/2010

The Diesel Switch also logs the entire changeover process for subsequent use as official documentation for port authorities if required.

The Diesel Switch hardware is controlled by a touch-screen control panel and has software to operate an MGO cooler to adjust fuel temperatures. The changeover valve uses magnetic couples that dispense with mechanical seals and are 100% leak-proof. It also has integrated sensors for detecting current and end positions. As back-up, the entire system has a manual override.
 

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

Marine Propulsion

Mexican Navy Delegation Visits NSSA

The U.S. Navy reported that its Norfolk Ship Support Activity (NSSA) welcomed the Mexican Navy Delegation to Building CEP-200, Naval Station Norfolk, Aug. 21 for

MN 100: Caterpillar Marine

Neumühlen 9 22763 Hamburg/Germany Tel: (713) 895-1449 Email: cat_power@cat.com Website: www.marine.cat.com Managing Director: Nigel Parkinson The Company: Caterpillar

MARAD: Total Fuel Cycle Study for Natural Gas

The Maritime Administration (MARAD) released a study that evaluates total fuel cycle emissions for natural gas versus conventional marine fuels. Results showed

Fuels & Lubes

MARAD: Total Fuel Cycle Study for Natural Gas

The Maritime Administration (MARAD) released a study that evaluates total fuel cycle emissions for natural gas versus conventional marine fuels. Results showed

LNG Transport Barge Design Approved by ABS

Conrad Shipyard, L.L.C. engaged Bristol Harbor Group, Inc. (BHGI) to develop a 3,000 cubic meter Liquefied Natural Gas (LNG) transport barge utilizing a Bristol

LNG America Selects Topside Designer for LNG Bunker Barge

LNG America has selected Taylor-Wharton to commence the front-end engineering and design work for the cryogenic topside of the company’s 3,000 cubic meter Gemini

 
 
Maritime Careers / Shipboard Positions Maritime Security Maritime Standards Navigation Offshore Oil Pod Propulsion Salvage Ship Repair Ship Simulators Shipbuilding / Vessel Construction
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: 0.2385 sec (4 req/sec)