Nor-Shipping: Shipowners and operators must optimise engine feed rates or risk engine failure

50% of vessels are operating at feed rates that are not optimal, leaving shipowners and operators at risk to engine problems associated with cat fines and cold corrosion.

In a study of 400,000 oil samples, ExxonMobil found that 50% of engines were not operating at optimised feed rates, while 43% showed signs of catastrophic cat fines issues, and 15% indicated cold corrosion.

These figures highlight the potential engine problems shipowners will face if they continue to operate with less than optimised feed rates, according to Iain White, ExxonMobil Marine’s Global Marketing Manager.

The major problem is that owners and operators are just not aware of the risks associated with over and under lubrication oil feed rates, White tells fathom-news.

They are surprised when their engines function incorrectly, or at worst, become completely inoperable, because they have not monitored cylinder condition.  White believes that owners and operators do not realise the seriousness of over or under lubricating their cylinders.

What happens when over lubrication occurs? The green zone shows the engine to be operating well. However, the engine becomes over lubricated and operates less efficiently, represented by the diamond shapes in the pink zone. The total base number (TBN) is high and the iron is low as a result of too much oil. Reducing the feed rate would reduce the TBN to bring engine performance back into the green zone. These results are produced automatically by ExxonMobil’s cylinder condition monitoring programme. Without the monitoring these figures would be unknown and engine problems would arise with no warning.

At the current time ExxonMobil has around 400 engines monitored on its Cylinder Condition Monitoring programme, a low number for the population of slow speed engines that should be monitored. White attributes this to a lack of awareness in the industry and a lack of recognition for the problems that not optimising feed rates can cause.

There is no indication at all that there is a problem until either the engine stop functioning correctly, or the results of the monitoring tests show, White reveals. This is why it is so important to monitor but yet shipowners and operators still do not see the reason to do so.

Fathom-News
editor@fathom-mi.com

 

 

 

Share article:

Dedicated topic pages >>

Other news >>

STAY INFORMED

Stay On Top Of The Transformation Of The Shipping And Maritime Sectors With Our Weekly Email Newsletter.