Just a couple of notes I talked to my engineer Friend John today about the Black coatings covers on the Bottle House incoming tanks. I told him exactly what I saw when I looked at them this summer and I asked why this cover was only used on the Incoming Tanks at the end of the 1966 Bottling House. His his best guess was the following not knowing the exact process.
Here is what I saw when I looked at the covers.
The covers were black on the outside and were made of Rubberized Asphalt Pitch , I told him the Inside was a sort of Yellow Red and flexable and here is how they worked and what they were on those tanks for he speculates.
John said the outside coating was made of a combination of Asphalt Pitch and rubber coating, to protect the internal fiberos insulation from UV degridation.
The Coatings Purpose apeared to be, to maintain a stable Liquid temporature for the Whiskey and to Minimize the Generation of Condensation which could Dilute and contaminate the Process batch of the types of Whiskey in the tanks.
This would better control Process Quality throughout external outside temperature variations ie summer , winter temporature extrems.
Dave Z
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It Seems All the Nicest People Drink Old Hickory
America's Most magnificent Bourbon


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