ExxonMobil Helps Danaos Shipping Extend Engine Life

Thursday, February 16, 2012
MV CSCL Europe’s 12-cylinder DOOSAN-MAN B&W K98MC-C engine is lubricated with Mobilgard 570, a cylinder oil formulated by ExxonMobil to reduce piston wear and deposits, and extend piston overhaul intervals in two-stroke marine diesel engines.

Engineers from Athens-based Danaos Shipping together with ExxonMobil, have reportedly extended the overhaul interval required for a piston in a DOOSAN-MAN B&W 12-cylinder K98MC-C engine from 16,000 hours to 42,575 hours. A recent overhaul revealed that cylinder number 11 was in remarkably good condition, with a negligible liner wear rate. The achievement took place aboard the containership MV CSCL Europe, which is chartered to China Shipping Container Lines. Representatives from Danaos Shipping and ExxonMobil systematically monitored the condition of the engine throughout the overhauling process. The results were all the more significant because the containership has been slow steaming since 2009, averaging 15.6 knots with engine loads as low as 30 to 40 percent, and also operating with a reduced cylinder oil feed rate.

Since it was built in 2004, MV CSCL Europe has been lubricated with Mobilgard 570, a cylinder oil formulated by ExxonMobil to reduce piston wear and deposits, and to extend overhaul intervals in two-stroke diesel engines. The ship is equipped with MAN Diesel & Turbo’s Alpha Adaptive Cylinder Oil Control (ACC), a system that controls the dosage of cylinder oil according to the amount of sulfur entering the cylinder with the fuel. Danaos Shipping also uses ExxonMobil’s Cylinder Condition Monitoring (CCM) programme to detect changes in cylinder condition so that vessel engineers can safely reduce Mobilgard 570 feed rates without increasing wear.

Ship engineers gradually extended the overhaul period on successive pistons in the 12-cylinder engine. Overhauling started at 16,000 hours and continued at extended intervals based on the good condition of the pistons, rings and liners. In cylinder number 11, the overhaul was done at 42,575 hours. Fuel sulphur level averaged approximately 2.62 percent throughout the period. Just before cylinder number 11 was overhauled, all monitoring parameters were within normal range, based on the results of scavenge air port inspections. A graph of liner wear rate over time shows that the rate in fact fell from a high of 0.02mm/1,000 hours to a rate at time of overhaul that was negligible.

The overhaul revealed that even at 42,575 hours, cylinder number 11 was in remarkably good condition, suggesting that the interval could have been extended much further. Liner wear rate, piston ring wear and the ring groove clearance were all well below the thresholds identified by MAN Diesel & Turbo. No evidence of scuffing was found. Danaos Shipping used the Alpha ACC to reduce the amount of Mobilgard 570 cylinder oil from a factor of 0.34 g/k/Wh x S% to the current minimum factor of 0.2 g/k/Wh x S%, which equates to 0.6 g/KWhr (the minimum setting recommended by MAN B&W) at normal loads.
According to ExxonMobil, the benefits of using Mobilgard 570 often become even more pronounced at feed rates below 0.6 g/KWhr. “We operate a high-quality fleet of 56 container ships with a reputation for reliability and cost-efficiency,” said Danaos Shipping’s Technical Manager Dimitrios Vastarouchas. “We have seen that Mobilgard 570 can help significantly extend piston overhaul intervals and for us the benefits of this technical achievement are financial and environmental.”

wwwexxonmobilmarinelubes.com

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

Marine Propulsion

Desulfurization of Exhaust Gases in Shipping

Are shipowners prepared to enter SECA zones?   Due to existing regulations on air exhaust emissions from the International Maritime Organization (IMO), and with

Cummins Reports Revenue Jump in Q2 2014

Cummins Inc. reported its results for the second quarter of 2014. According to the report, second quarter revenue of $4.8 billion increased 7 percent from the same quarter in 2013.

Master Marine Delivers Z Drive Towboat

Master Marine, Inc. delivered its first 2,000 hp Z Drive inland river towboat last month. The towboat represents the first vessel (Entech Design) of this series by the yard.

Fuels & Lubes

U.S. Marshalls Ordered to Seize Kurdish Oil Cargo off Texas

Acting on a request from the central government in Iraq, a U.S. judge has signed an order telling the U.S. Marshals Service to seize a cargo of oil from Iraqi Kurdistan

Tripoli Airport Ablaze, Rockets Leave Libya in Chaos

Diplomats flee Libyan chaos; Politicians appeal for international intervention. Clashes in Tripoli, Benghazi kill around 160 over two weeks, while Libyan capital face fuel, power shortages.

Europe Sleep Walking into an Energy Crisis: Analyst

The downing of flight MA17 has prompted calls for further sanctions on Russia targeted at its energy sector. Douglas-Westwood in its 'DW Monday' analysis considers

Container Ships

Diana Containerships Q2 & 1H 2014 Financial Results

Greece-based Diana Containerships Inc., a global shipping company specializing in the ownership of containerships, has reported net income of $0.6 million for the second quarter of 2014,

Danaos Corporation 2Q and 1H 2014 Results

Danaos Corporation ("Danaos") (NYSE: DAC), a leading international owner of containerships, today reported unaudited results for the period ended June 30, 2014.

Marseilles Fos Reports Mixed First Half

First-half container traffic at leading French port Marseilles Fos totalled 583,287 teu – up 7% on the first six months last year - marked by a 10% increase at the deepsea Fos terminals.

Marine Power

Desulfurization of Exhaust Gases in Shipping

Are shipowners prepared to enter SECA zones?   Due to existing regulations on air exhaust emissions from the International Maritime Organization (IMO), and with

Cummins Reports Revenue Jump in Q2 2014

Cummins Inc. reported its results for the second quarter of 2014. According to the report, second quarter revenue of $4.8 billion increased 7 percent from the same quarter in 2013.

Master Marine Delivers Z Drive Towboat

Master Marine, Inc. delivered its first 2,000 hp Z Drive inland river towboat last month. The towboat represents the first vessel (Entech Design) of this series by the yard.

 
 
Maritime Contracts Maritime Security Maritime Standards Naval Architecture Navigation Pipelines Salvage Ship Repair Shipbuilding / Vessel Construction Winch
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: 0.1171 sec (9 req/sec)