# how much pressure can a 2-liter soda bottle take?

Basically, if I released CO2 into the bottle, how much pressure can it take before it explodes if external conditions are at 1ATM and ~70F?

And how much pressure is safe to fill it without fear of explosion (safety limits).

This is an empty standard coke/sprite type bottle.

Relevance

You would have to do a bit of research: You need to know the dimensions of the bottle: Diameter and wall thickness.

You need to know the plastic it is made from and the corresponding tensile strength (yield) of the material. Then you can update these calculations:

Assuming that the diameter of the bottle D=5 inches, wall thickness t = 0.025 inches, and the plastic has a yield strength of 5000 psi:

The hoop stress in the wall of the bottle = PD/2t

The longitudinal stress in the wall = PD/4t

For this pressure vessel situation, those 2 stresses are orthogonal and and the principal stresses s1 and s2, the von mises failure theory suggests that the stress levels are acceptable if: sqrt(s1^2 - s1*s2 +s2^2) < yield, so:

sqrt((PD/4t)^2 - (PD/4t)*(PD/2t) + (PD/2t)^2) < 5000

expanding and collecting the LHS =>

0.433 P D / t < 5000

Filling in the example numbers, P < 57.7 psi

And ofcourse with anything safety related, a safety factor should be applied in proportion to the risk severity. In this case an exploding bottle probably would not cause death, but could cause serious injury - A safety factor of 5 is likely appropriate... thus, assuming the example numbers are about right, you should not pressurize to more than 57.7/5 = 11.5 psi (this is delta compared to 1 ATM)

• Anonymous
4 years ago

Soda Bottle Pressure

• 4 years ago

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You can test for this, but when you do - use water or some other liquid. It is incompressible, and the pressure will be relieved by the smallest change in volume once the bottle cuts loose.

If you do this testing with a gas, you are compressing a big spring, and the resulting release of energy when the bottle fails will be large.

• Anonymous

you cant pressure test it withour the right fitting on the top.

My guess is 75PSI as it is recycled plastic.

We did a test on Recylcled plastics and the results were averaged out at this in 2004