Diesel corrosion

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ZMiller
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Re: Diesel corrosion

Post by ZMiller » Sun Dec 22, 2019 12:26 pm

I have given up on saving and or pointing out integrity issues due to corrosion in vessels that store fuel. In all likelihood it is as with trying to refloat the Titanic, to late to reverse the damage. There are opinioned experts all along the visible resolution path spectrum. The problem being nobody yet can see a whole picture for resolution.

The recipe for this disaster is defined by changes in storage tank Use and Regulations without consideration of system operation change dynamics or consequences.
When you are dead it's likely you won't know it. It could be difficult for others. It's the same if you are stupid.
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PatSmyth
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Re: Diesel corrosion

Post by PatSmyth » Sat Feb 29, 2020 1:54 pm

Just catching up on the posts.

Regarding Re: Diesel corrosion
Unread post by CherokeeUST » Mon Sep 16, 2019 11:13 am
Ethanol is not the cause of corrosion???

Ethanol is mentioned 50+ times in the 2016 EPA corrosion report. One simple possible reason that trace ethanol is found in ulsd biodiesel blends is that both biodiesel and ethanol are polar molecules, so will be attracted to each other. If so, there should be trace biodiesel in gasoline blended with ethanol. Has anyone looked for biodiesel in ethanol blended gasoline?

A new paper has just been released that monitors corrosion in B20 storage over a years timeframe. This is the first long term, in situ study, and shows the increased levels of MIC over time. It is a very good read. I'm interested as it ties in water and MIC. Dry the fuel, control the MIC. Two ways of control is removal of water, with SAE J1488 filtration, and prevention of water absorption with nitrogen blanketing. I understand that water can also be removed using heated nitrogen.

This latest paper (Feb 20 2020) studied 6 tanks at two United States Air Force (USAF) bases for a year. It is coauthored by Dr. Bradley Stevenson, Associate Professor of Microbiology, Dept. of Microbiology and Plant Biology, University of Oklahoma.

This peer reviewed paper was just published in Frontiers in Microbiology, "a leading journal in its field, publishing rigorously peer-reviewed research across the entire spectrum of microbiology."

https://www.frontiersin.org/articles/10 ... 00167/full

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CherokeeUST
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Re: Diesel corrosion

Post by CherokeeUST » Wed Mar 04, 2020 7:53 am

Thank You Pat. Nice report on B20.
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ZMiller
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Re: Diesel corrosion

Post by ZMiller » Wed Mar 04, 2020 7:57 pm

A doubling of a nitrogen mass flow drying diesel (Hennery and Fick's laws) cuts drying proportionally in half the time. Heating to say 60c forgoes the need to increase mass flow. An example being water at 500ppm could reasonably and predictably be groomed down to say 80ppm. Depending on the percentage of bio diesel blended in the last 80 to 40 ppm at the initial mass flow is tough to bump out. While between 40 and 80 ppm might be marginally acceptable it has been found that the same mass flow at 60c greatly decreases the drying time. Determining the polar bonding wall would depend on knowing the blend percentages.

Interestingly if one knows the blend percentages and the nitrogen mass flow temperature is gradually increased the the ppm reduction curve to less than 20 ppm can be seen more or less as a straight line.
When you are dead it's likely you won't know it. It could be difficult for others. It's the same if you are stupid.
"Tact is the ability to tell someone to go to Hell in a way that they will begin looking forward to the trip"

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