Originally Posted by Red5
Hey guys. General LN2 question, I hope this is the right spot to ask.
I've done some CPU LN2 benching previously but am soon going to be doing CPU and GPU together. I have read this requires a lot of LN2 so I have been researching renting a tank from Airgas, probably 180L.
My question is that I see they come in many different pressures (22psi, 35psi, 50psi, 230psi) and I'm not sure which would be ideal. I will be dispensing LN2 from the large tank into a 10L dewar, then to thermoses for pouring. I assume that I want the lowest pressure possible for my uses, so the 22psi but I haven't dealt with the larger tanks in the past and any advice would be great.
Also, I noticed they come in grades (food grade, medical grade) and I assume I should just get whichever option would be cheapest, is this the right thinking?
Thanks in advance!
My tanks come 22 psi, today I got a 35 psi tank but the guage only says 20 psi, stupid place sent me 160 instead of 180. For me it's better because it becomes cheaper when you get 180L, so what I did was find 4 really cheap dewars on ebay.
So I can use 2 dewars on the weekend and then fill up my 4 and I can empty 180L in a weekend and return to the welder without paying rental and usually still have 4 full tanks.
The problem with a 10L dewar when doing cpu and gpu is that it will go so fast and you would have to take a break to refill the 10L tank, which isnt good. But like Mike said depends on platform. Like some older platforms and like my i3/gt 710 setup or i3/rx460 setup or g92/g80 gpu's, 10L might do ok.
I found a hose on ebay for like $60 so I never get charged for that now, it's lasted fine for almost 2 years.
Also ask for industrial grade, you dont need medical or food, which is cleaner and more purified.
It really depends on what they charge rental for the 180L, but it also wouldnt be convenient to drive there and only fill up 10L everytime, so big tank is probably best option.
I also never use a phase separator on end of hose and works fine. If they have a couple small dewars you could borrow that would be best, like 20-30 liters My welding place did that for me a lot.