Internal coating for ethanol tank

[PAN]

I recently use epoxy phenolic (DFT 100 microns x 3 layers) for ethanol tank. Tank material is plain carbon steel. I will have another project for ethanol storage tank again. Do you have other recommendation for coating system which is more suitable?

 

[MJCronin]

PAM

Try this link:

http://www.bridgeportchemical.com/Current Docs/New/SHELL.pdf

The recommended product is "Glass Armor" from Bridgeport Chemical - 40mils thick

If Shell oil has chosed this product, it should be good enough for you...

MJC

 

[rustbuster1]

It's dicey for MJC to suggest a specific coating from more than 3 years ago because so many product formulations (and the companies that produce the coatings) have changed dramatically in the last few years.
Also I would like to hear more on the 100 micron DFT 3 coat product PAN used - that would be a precision application or perhaps it's 4 mils per coat.
Ethanol is no big deal for high performance polyamide epoxy coatings up to 120F, but would it not also be easily handled with an Inorganic Zinc primer?? That should be very cost effective and applied in only one coat.

 

[PAN]

rustbuster1,

The coating will be in the internal floating roof tank. Some manufacturers recommend inorganic zinc (DFT 100 micorns x 1 layer) as you pointed out. In my understanding, inorganic zinc primer requires better surface preparation (SA 2.5 to SA 3) compare to epoxy phenolic. Due to the tank is existing tank, it may be more difficult to control the quality of surface preparation. Moreover, 1 layer thickness of coating is new for my company standard. However, I will consider this coating system in my next project.