Needs more safety! Commercial full pressure handling tubing starts at 0.049 to accomodate stress at fittings and thermal cycling. Don't think I'd be comfortabl

Needs more safety! Commercial full pressure handling tubing starts at 0.049 to accomodate stress at fittings and thermal cycling. Don't think I'd be comfortable next to 1/4" / 0.035 at full pressure after forming like that! Fittings deserve a mention, they're specialized. LN storage needs more than a mention. An all-stainless thermos can work, but if you've made it this far you can afford $150-200 for a real LN dewar. Source: Dad worked at an air liquefaction plant and is full of usually hilarious stories about gas handling done wrong.