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Thanks for all input. Very helpful.

I don't recall what I entered in the search text but there is a company called "Arrow Pneumatics" in Illinois that apparently sold this technology to another company in New Jersey. I would have to do another search to find again.

A follow up question to my previous post: During an internet search I saw a company that makes microwave desiccant dryer units. They claim less energy and purge air useage. Any knowledge or experience with these? Is this new unproven technology?

Our plant has heated desiccant dryers for instrument air. The desiccant comes in small spheres but is disintegrating into powder and clogging the after filters. Heating elements are failing due to corrosion of the tube shields. How are these two problems related?

Oldestguy, I will check on the temperature difference. There are no salty soils or substances involved but interesting information. Rain coming down the sides was one of my first thoughts before we went and looked. However, the bottom 8" of the perimeter is sealed with an industrial coating...

We may try the standpipe. The pipes are for leak detection.

Thanks for the reply. How would a portion being in a cut affect the situation?

I do structural consulting work for chemical company. A couple of their large storage tanks have double bottoms separated by a 4" void filled with sand. The reason there are double bottoms is the original floors were found to be corroding and now probably even has holes in them. Leak detection...