Casanova Posted May 11, 2016 Share Posted May 11, 2016 Hi everyone! I'm going to get my first dewar soon (probably a new one, with warranty, about 20lt capacity) but since it will be stored inside my house (home office), i want to know from experienced guys here if there is any tips about pressure/valve problems (is it going to explode?! LOL ), properly storage, how much ln2 do i need to keep in it for future refill etc...? Thanks in advance Quote Link to comment Share on other sites More sharing options...
newlife Posted May 11, 2016 Share Posted May 11, 2016 Bone dry should be fine for refill and only safety thing I can think of is if you leave it in a confined space for a long it can case suffocation due too high nitrogen content in the air Quote Link to comment Share on other sites More sharing options...
zeropluszero Posted May 11, 2016 Share Posted May 11, 2016 depends entirely if its pressurised or not. if its not - no danger. if its pressurised, need to ensure it has "blow off" valves and that they're working. Quote Link to comment Share on other sites More sharing options...
Guest barbonenet Posted May 11, 2016 Share Posted May 11, 2016 Hi everyone!I'm going to get my first dewar soon (probably a new one, with warranty, about 20lt capacity) but since it will be stored inside my house (home office), i want to know from experienced guys here if there is any tips about pressure/valve problems (is it going to explode?! LOL ), properly storage, how much ln2 do i need to keep in it for future refill etc...? Thanks in advance take 35l, or u will regret ! Quote Link to comment Share on other sites More sharing options...
GtiJason Posted May 11, 2016 Share Posted May 11, 2016 Mine is pressurized and is kept indoors in spare bedroom, it has a relief valve that is one way and opens when pressure is over 5 psi. It also has a cable connecting to the dewar handle in case of failure, the top is just a compressed rubber stopper and will pop off way before there's enough pressure to pop the dewar itself. Very convenient but needs to sit a day before pressure is built up enough to pour, but if I'm looking to use right away I just ditch the top and pour by tipping. Mine also has a gauge to show the psi and the valve can be pulled out a bit to relieve pressure or removing the top Quote Link to comment Share on other sites More sharing options...
Casanova Posted May 11, 2016 Author Share Posted May 11, 2016 Mine is pressurized and is kept indoors in spare bedroom, it has a relief valve that is one way and opens when pressure is over 5 psi. It also has a cable connecting to the dewar handle in case of failure, the top is just a compressed rubber stopper and will pop off way before there's enough pressure to pop the dewar itself. Very convenient but needs to sit a day before pressure is built up enough to pour, but if I'm looking to use right away I just ditch the top and pour by tipping. Mine also has a gauge to show the psi and the valve can be pulled out a bit to relieve pressure or removing the top Thanks everyone for the tips. What is your dewar model? I didn't get this: "It also has a cable connecting to the dewar handle in case of failure.." How does it work? Quote Link to comment Share on other sites More sharing options...
Splave Posted May 11, 2016 Share Posted May 11, 2016 (edited) ^if it for some reason was to fail and shoot the top off it wouldnt get lodged in his ceiling and would be retained by the handle. I have 3x30L dewars and 1x50L with withdrawal device. The 30's maybe lose 1/4 of a liter a day, the 50 loses about half a liter a day. If I could do it again I would have all 30L dewars. you can pour them off the floor or set them on top of a chair to pour them once they are half empty. they just lose a lot less than the 50L with top does. Edited May 11, 2016 by Splave Quote Link to comment Share on other sites More sharing options...
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