[img http://res.cloudinary.com/engi
[img http://res.cloudinary.com/engi
(OP)

I have seen one of the datasheet for cryogenic vessel which specifying the vessel shall be designed for Allowable temperatures of -196 Deg C as the minimum and -20 deg C as the maximum.
I beleive that this implies the vessel can withstand with a lowest temperatue of -196 deg.C and maximum temperature of -20 deg.C.. please suggest me whether my understanding is correct or not If my understanding is correct , then it means that the vessel can not withstand a temperature which is higher than -20 Deg.C.. then how we can do the fabrication and keeping of the vessel before commissioning at ambient temperatures which is for sure higher than this -29 Deg C.
once we are filling the vessel with cryogen the vessel temp will reduces to very low values say -196 Deg C.. but still doest it make sense to consider the maximum allowable temperature as -20 deg c for the design ??.. please clarify my doubt ..





RE: [img http://res.cloudinary.com/engi
After all, how would you load it and pressurize the inner vessel unless it was cold?
As a practical mater most of the materials used for this application would have similar properties at 50C and -50C, that is why they are used for such tanks.
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P.E. Metallurgy, Plymouth Tube
RE: [img http://res.cloudinary.com/engi
It seems that you are suggesting that the Vessel cannot be fabricated or tested which is rather silly!!!
RE: [img http://res.cloudinary.com/engi
RE: [img http://res.cloudinary.com/engi
Your scenario is likely that the design info was stated with a max temperature of -20°C so they never bothered finding out the actual upper limit for the vessel.
Thanks,
Ehzin
RE: [img http://res.cloudinary.com/engi
TTFN (ta ta for now)
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