We recently built an outdoor, open top, non-insulated, non-heat traced API650 Stainless Steel tank. Shortly after completion, the owner asked the design firm if it's ok that 1ft water will freeze during winters since the tank's lowest drain nozzle is a foot off the bottom (no sump, no sloped bottom, no flush nozzle). Now the design firm is asking us that question, or what is a safe depth of water that can freeze at the bottom of a tank. I've scoured my resources and can't find anything that might answer this question, any help would be appreciated.
The tank is infrequently used, only when other tanks are having maintenance done. So, it sits -almost- empty for long periods of time.
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