So the 180L dewar comes with a withdrawl device?
"Running an insulated" tube might become alot harder then you think.
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IF you bring in your own dewer, the charge works out to 5/6 USD per liter because they first have to chill down the unit and that wastes product ... umm sure..
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And this is 100% the case, you bring in a room temp dewar it can take more then a few liters to chill it down.
Normally it's about 15% of carrying capacity (A 100L dewar might take 15L to chill)
And they charge you by the size of your dewar, so they're loosing quite a bit of money there.