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 May 2015 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Fuels & Lubes

Crowley’s 2nd LNG ConRo Ship Ahead of Schedule

Shipbuilder VT Halter Marine, Inc. announced construction has started early for the second liquefied natural gas (LNG)-powered ConRo ship, Taíno, for Crowley Holdings, Inc.

Overnight Cruise Ship Visits Suspended in White Bay

The New South Wales (NSW) Port Authority has suspended all overnight cruise ship visits to White Bay until the NSW Environment Protection Authority (EPA) has regulated

Fluxys LNG Launches Zeebrugge Capacity Consultation

Belgian gas infrastructure operator Fluxys said on Thursday it was launching a market consultation to assess demand for additional capacity at the Zeebrugge liquefied natural gas terminal in Belgium.

Container Ships

Crowley to Manage 4 Jones Act Ships for Pasha

Crowley Maritime Corp.’s ship management group has been awarded a new contract with Sunrise Operations LLC, a subsidiary of The Pasha Group, of San Rafael, Calif.

Matson Completes Horizon Lines Acquisition

Matson, Inc. has completed the acquisition of Horizon Lines, Inc. which includes Horizon's Alaska operations and the assumption of all non-Hawaii business liabilities.

Crowley’s 2nd LNG ConRo Ship Ahead of Schedule

Shipbuilder VT Halter Marine, Inc. announced construction has started early for the second liquefied natural gas (LNG)-powered ConRo ship, Taíno, for Crowley Holdings, Inc.

Marine Power

New Power Optimization Solution for LNG Carriers

NAPA and DSME launch tailored NAPA-DSME Power Solution for LNG carriers; leading LNG carrier shipyard offers specialized performance monitoring solution   South Korean shipbuilder,

New Ship Continues Atlantic Offshore's Fleet Modernization

Atlantic Offshore Rescue will unveil the third new vessel in the past 12 months as part of its fleet modernization program, representing an investment totaling $458 million.

Iran, Oman Sign Maritime Agreement

Iran's Mehr news agency said that Iranian Foreign Minister Javad Zarif and Omani Foreign Minister Yusuf bin Alawi have announced that the two countries have agreed

 
 
Maritime Careers / Shipboard Positions Naval Architecture Offshore Oil Pipelines Pod Propulsion Port Authority Ship Repair Ship Simulators Shipbuilding / Vessel Construction Sonar
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: 0.0868 sec (12 req/sec)