Originally Posted by
bthom
I'm not completely understanding the idea but any more details would be greatly appreciated.
@aenigma
As far as I'm aware you shouldn't have to pay shipping if you're willing to wait long enough. I have no association with Airgas other than work purchases, but based on that the area rep should be able to get one sent at no cost to one of their regular stops assuming the rep can find a cyl with the right part number to shuffle around. At work we get direct shipments of the regular stuff (nitrogen, oxygen, argon, etc), but a normal stop would also be a local welding shop.
By "pure" I'm guessing they quoted CP grade (chemically pure).
That's very interesting you have a static offline pressure of 150psi. That would mean your system has enough refrigerant to operate but isn't completely 'saturated' (I'm sure there's a more correct term). If you were to keep pumping n2o into it, it should saturate at around 700psi and then some of it would turn to liquid at some place within the system. That wouldn't happen with ethylene at room temp. I can see the advantage of having a buffer tank so that a minor +/- in refrigerant charge doesn't make as much of a difference and makes the whole system less sensitive to a slight over/undercharge.
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