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

Marine Propulsion

An Efficient Addition to a Strong Fleet

Cvitanovic towing of Belle Chasse, Louisiana has taken delivery of a fourth vessel for its fleet of highly efficient Lugger-style tugs. Built at the Rodriguez yard in Bayou LaBatre,

US Orders Trawler with Common-Rail Technology

Tier II-compliant 32/44CR technology to deliver fuel efficiency, low emissions and improved productivity   MAN Diesel & Turbo has received an order for an MAN

Sea Star Line: Equipment Replacement Plan on Track

Company Receives New Refrigerated Containers and Places Order for New Genset Equipment   Sea Star Line, LLC began receiving the first of its new 100 40’ and 45’

Fuels & Lubes

Interferry Welcomes IMO Decision on LNG Fuel Tank Placement

Interferry has welcomed a decision at last week’s IMO Maritime Safety Committee meeting (MSC94) setting out rules for the location of fuel tanks on LNG-powered ships,

Environmental Groups: IMO Polar Code Too Weak

The International Maritime Organization (IMO) today adopted the Polar Code aimed at regulating shipping in Polar Regions. Several environmental groups have criticized

Cost to Fuel Ships Falls

For a ship that burns 24 tonnes of fuel per day while steaming, fuel costs are reduced by as much as $1 million a year if current price level stay put. Assuming

Container Ships

US Port Congestion Hides Deeper Issues

Ports on the U.S. West Coast are currently suffering from chronic congestion, but are there deeper issues affecting their performance?   Drewry’s new report Container

Hamburg Cargo Volumes at Record High

Seaborne cargo throughput of 110 million tons in the first nine months sets new record for Port of Hamburg    With total throughput of around 110 million tons,

Rates Increase Boosts Diana Containerships Q3 Income

Diana Containerships Inc. reported net income of $1.4 million for the third quarter of 2014, compared to a net loss of $0.7 million for the respective period of 2013.

Marine Power

An Efficient Addition to a Strong Fleet

Cvitanovic towing of Belle Chasse, Louisiana has taken delivery of a fourth vessel for its fleet of highly efficient Lugger-style tugs. Built at the Rodriguez yard in Bayou LaBatre,

US Orders Trawler with Common-Rail Technology

Tier II-compliant 32/44CR technology to deliver fuel efficiency, low emissions and improved productivity   MAN Diesel & Turbo has received an order for an MAN

Sea Star Line: Equipment Replacement Plan on Track

Company Receives New Refrigerated Containers and Places Order for New Genset Equipment   Sea Star Line, LLC began receiving the first of its new 100 40’ and 45’

 
 
Maritime Careers / Shipboard Positions Maritime Contracts Maritime Security Navigation Offshore Oil Pipelines Ship Electronics Ship Repair Ship Simulators 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: 0.2478 sec (4 req/sec)