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"Dan White" wrote in message ... "spiral_72" wrote in message oups.com... Actually, yea..... I thought about that. I really don't know what to expect. I would suppose a material could be brought to a low enough temp causing that material to become brittle. Water, plastic, chewing gum, lots of stuff becomes brittle at a low enough temp. Any idea what that temp is for steel? I haven't looked that up -- maybe it can be found by googling. It probably depends on the type of steel, although they might all be in the same neighborhood. I checked on dry ice the other day and I think it sublimes at -78.5 deg C at atmospheric pressure, and warmer at higher pressure, but you'd need an equilibrium diagram for that. -78.5 C should be the worst case though. dwhite Dodge the whole embrittlement problem by putting down a layer of 1/4" - 1" thick styrofoam between the dry-ice and the base of the tank. It should not affect the volume capacity significantly, but it will keep the steel at a reasonable temperature. It will slow down your melt rate quite a bit, but that's probably not a bad thing anyways. You could use a ceramic or hard plastic insulator too, but I'd be concerned about the additional shrapnel when the tank explodes ;-) Joe |
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