We have an outdoor storage tank for 40% ferric chloride solution. Looking at various MSDS, I have seen freeze point of ferric chloride solution listed from -10C to -50C. If -10C, we would need some heat tracing, but probably don't have to worry about it if it is lower. So which number is right and are heat tracing generally required for Ferric Chloride storage tank? The design outdoor temperature is 0F.
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