Quote:
Originally Posted by RoboChair
2 liter bottles are good to about 120psi before failure, 20oz is probably a fair bit higher. You can do some destructive tests first. I would suggest clear polycarbonate tubing which you can buy from McMaster as you can use pipe fittings with it.
Alternatively just use a long piece of clear hose.
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I too was thinking along these lines. Most safety standards with regards to pressure vessels want a 2.3 Safety factor, so if the burst pressure is 120 PSI, then filling up to 50 PSI would be the responsible thing to do. I know for water rocket competitions, a lot of folks regularly fill them to 70 PSI (about a 1.5 SF).
The stresses should be lower on a 1 liter bottle which may be able to get a higher rating.