Lube-Tech
of the following: micro-dieseling, electric static spark or electric static discharge – all in which contribute to varnish formation in a system. Micro-dieseling will form abrasive carbon molecules that can contribute to the increase in wear. Making sure the proper anti-filtration system is installed, also ensuring the system is properly grounded can alleviate these issues. The patch can also appear to have a greyish/ brownish tint.
PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
No.140 page 6
and Blue on the colour scale. Similar to a*, the b* value has the same colour range of -100 to 100 with the negative value being more on the blue part of the scale, whereas a positive value will be yellow. The b* value can indicate sticky deposits are likely being formed, these can adhere to abrasive deposits and cause an increase in wear. The b* value can also help indicate if wear is being generated. Gummy-like deposits will form at a more advanced stage of varnish and immediate action is highly recommended to prevent future failures.
The L*a*b* values, along with each MPC value, can be correlated to provide a better understanding of the severity of the varnish in the system and what can be the cause and/or oil degradation that is causing varnish to form. Understanding these values will also help identify the root cause and mitigation needed. In the past, some of the most severe cases of varnish had to be removed utilising more than one type of varnish removal to completely clean a system, increasing costs.
Figure 12 (provided by Xrite Patone)
a* (Green and Red) the a* value detects the green and red on the color scale. The difference between this value and L* is that the colour range can range from -100 to 100, a negative value will favour green on the scale, and a positive value will favour red on the scale. The a* value can indicate the EP additives are decreasing and/or sludge corrosive particles are reacting and becoming catalysts, further impacting the formation for varnish. If using a turbine oil formulation with EP additives, the a* value should be closely monitored to help indicate any depletion of additives and it can indicate wear in the system which can act as catalyst to further the formation of varnish. b* (Yellow and Blue) the b* value detects the Yellow
In recent years, the development of filtration systems, additive/cleaners, ion exchange or formulation changes have all proven themselves to be effective, decreasing costs overall. That is why it’s important to understand the type of varnish in the system to help decide which method of mitigation would be the most effective. It’s recommended to reach out to your equipment OEM, fluid OEM, and even filter OEM to see what possible solutions they offer for varnish mitigation. Our overall goal is to ensure we are providing customers with the root cause of the formation of varnish and a better understanding of the condition of the machine’s health.
LINK
www.polarislabs.com
LUBE MAGAZINE NO.169 JUNE 2022
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