The operator of a 95,390 gross tonnage container vessel was concerned that its existing cylinder oil was not providing sufficient protection to its fully de-rated 47,430 kilowatt MAN S90ME-C8.2-TII engine.
On-board field trials conducted by ExxonMobil engineers aimed to identify the optimum cylinder oil and feed rate for the engine, which was especially susceptible to cold corrosion due to being de-rated. Trials using Mobilgard™ 5100 found that the 100 BN cylinder oil provided the necessary protection at a reduced feed rate.
Sweep tests on the engine, which operates on heavy fuel oil (HFO) with a high sulphur content of 3.4 per cent under loads of between 31 and 36 per cent, indicated acceptable wear levels were achieved down to an Adaptive Cylinder oil Control (ACC) factor of 0.23 for Mobilgard 5100. This delivered a feed rate of 0.7 g/kWh, down from the pre-trial rate of 1.2 g/kWh – a saving of 40 per cent.
Additional benefits included enhanced engine cleanliness and an associated reduction in maintenance and downtime.
Find out how we can help optimise your vessel’s performance and reliability by contacting an ExxonMobil representative.
This case study is based on the experience of a single customer. Actual results can vary depending upon the type of equipment used and its maintenance, operating conditions and environment, and any prior lubricant used.