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How much psi can these objects hold... Answered

How much psi can a:

1. Coke Bottle
2. PVC Pipe
3. Metal Pipe

safely hold?

Is there a formula that I can use to calculate any vessel's psi capacity?
Thank You!


1. I would only take them to 110PSI generally. Most premium brands use good quality materials and have reasonable seams. I have taken bottle to 150PSI no problems, yet have them fail at as little as 90PSI. Age and fatigue play a role too.

2. PVC pipe is not designed for pressure. Don't use it for  things it is not designed for. PVC cracks and shatters under high pressures. It may fail with as little as 130PSI.

Use pressure rated pipe, with a pressure rating spec on the side. Look up the relevant code to clarify its rating.

3. There are too many types to go through... A few....  These will vary depending on gauge.

Copper - 800PSI

Seamed Hot dipped gal- 1100PSI

Stainless seamed- 1100PSI Drawn- 2500PSI

A PET bottle may be good for 100 PSI, what the tubes hold depends upon their dimensions. There may be a formula, but it will be horrendously complicated if it covers any vessel.


I suppose it would also depend on the thickness of the walls of each container.

Also the shape ,method of construction, exact grade of material etc.


A PET bottle is 100 PSI it's an industry standard, I looked it up one time.

So did I, but without going back to check I didn't want to be absolute on it. Thanks for reminding me of that.



8 years ago

PVC  piping is often used for pneumatic spudguns, try googling "make pvc pneumatic spud gun" they will be likely to mention safe pressures, it also varies form the type of PVC pipe it is.

I have made a few spudguns from copper piping (22mm) these have been pressurised to 200psi, the chamber was maybe about 2feet long.

good luck, and stay safe from shrapnel!

.  The maximum working pressure and/or minimum burst pressure for the piping should be easy to find on the 'Net - Google is your friend.
.  Not sure where you would find the safe working pressure of a Coke bottle, but Goggle ought to be able to put you on the right track.
.  You should be able to find formulae for "regular" shaped containers (pipes, spheres, &c) made of common materials on the 'Net, but, as lemonie points out, calcs for any shape get out of hand fast.