Dewar safety tips

[Casanova]

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

[newlife]

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

[zeropluszero]

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.

[Guest barbonenet]

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 !

[GtiJason]

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

 

 

[Casanova]

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?

[Splave]

^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