Parker Kittiwake announced a breakthrough in onboard cold corrosion testing with their new portable test kit. In less than five minutes per test, Parker Kittiwake’s Cold Corrosion Test Kit monitors specific levels of corroded iron in used cylinder oil.
The oil used to lubricate the cylinders of large 2-stroke marine diesel engines has to contend with high temperatures and acidic products formed during the combustion of sulphur-rich bunker oils; for this reason cylinder oil is used on a continuous loss basis.
In recent times ship operators have taken to running engines at reduced speeds (so-called slow steaming) as a means of improving fuel consumption. Unfortunately slow steaming is accompanied by a drop in engine temperature which allows acid to build up on the cylinder liners thereby promoting their “cold corrosion”.
The iron compounds formed by this process are then flushed from the engine by the cylinder oil. This is leading to excessive liner wear, requiring expensive replacement. The iron found in used cylinder oil samples typically exists in various forms, each one having its own particular properties.
For example, metallic iron particles worn off the cylinder liner by cat fines exhibit strong ferromagnetism and may be detected using the Parker Kittiwake LinerSCAN. On the other hand, compounds such as iron sulphate and rust, which are formed during the combustion process by reactions involving the cylinder liner, cannot be detected magnetically.
One way of mitigating the effects of cold corrosion is to increase the scrape down oil feed rate. Not only does this increase the use and therefore cost of the oil used, over lubricating can have a detrimental effect due to fouling of the rings and calcium deposit build up. Knowing the exact operating conditions and wear mechanisms within the cylinders allows fine adjustment of the feed rates to minimise wear and reduce costs. Engine OEM’s have recently issued service letters giving guidance as to acceptable levels of corrosive wear.
Parker Kittiwakes patented new Cold Corrosion Test Kit is a quick, simple to use chemical test that provides an accurate measure of the parts per million (PPM) value of Fe2+ and Fe3+ compounds in used scrape down oil. Rather than simply giving a figure for the total iron (including metallic compounds), which other tests provide, knowing the specific PPM of corroded iron allows informed decisions to made in adjustments to feed rates and the BN of the oil used.The quick test (<5 minutes per cylinder) allow rapid analysis of the whole engine.
Source: Parker-KITTIWAKE
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