So this is a "chocolate" centric question I've had for a while -
I've been told a few billion times that water and chocolate is a bad combination. I've said it a few billion times. When we did our annual tank clean out we did not clean so much as scrape empty, let sit over night, and look in with a flashlight. Our mechanic (and our other site's mechanic) are vehement that if there was a leak in the water jacket "you'd know right away" because "water and chocolate don't mix".
When we were doing our annual capex stuff, I requested $$ for pressure testing the double jackets. Apparently we can't do this because none of them are pressure rated, and pressurizing them will cause them to burst. Again, I was assured this was just fine because if water hits chocolate, it will turn the chocolate black and solid, and cause the resulting mix to clog the filters or self seal the hole. Then the other site's mechanic said "Try it! Just put some water in some chocolate and see how it turns into a black lump."
I happened to have some water and some liquid chocolate around, so I put it in a sample cup. It did not harden or turn black. I made chocolate mousse. Actually adding water to it only thinned it and kept it from solidifying. So I find it hard to believe that a pin hole leak would be instantly detected in a giant tank of chocolate.
A few questions :
If money and time were infinite, would it be ideal to clean these out with a wet clean and let it dry?
We're doing to be installing some new tanks (hooray), isn't there usually a wet clean after installation?
We have a chance in April to scrape the tanks down again, and this time I want to dye the water so if there is a leak it will be easy to see after sitting over night. Has anyone done this? Does anyone have double jackets that they can not pressure test?
Is visual inspection during an annual scraping an adequate control for leaking double jackets? I understand the risk side of the risk assessment (leak = micro risk + reduced quality), but I'm not fully confident in that as a control.