Quote Originally Posted by Gasbot
Hello guys,

I'm in need of a bit of help from the collective. I've got a pair of old CO2 bottles (4 outside dia ones) which oddly enough fit perfectly into my chassis. The newer shorter fatter CO2 bottles simply won't fit into the space I have available. I would like to get my hands on some new bottles but I don't think they are available to buy any more. To my untrained eye my bottles look good (there is some cosmetic damage in the paint) but they are well out of their test date, so my questions are:
2. Can I get these bottles hydro pressure tested and certified by a local workshop?
If a bottle is 20 years old, nobody will recertify.

1. Does anyone know where I can get hold of 4 dia CO2 bottles for reasonable money?
Doubtfull. Last time I bought 2 new bottles with screw valves I coughed up £120 each.


But assuming the worst:
3. Can I manufacture my own cylinders and get them tested (I'll use the valve & burst disk etc from the bottles)
Yes, but no firm will certify a welded mobile storage bottle.
Maybe if you have the welds seperatly certified by Rntgen pictures, and have the certification sheets of the used material.

And even then, there is a small problem.

9.3 Cylinders
The compressed gas shall be stored in a commercially manufactured gas cylinder of appropriate design,
specification and certification. Except where the maximum storage pressure is less than 50psi (3.4bar).
Some events may have further restrictions on bottle sizes/ weights used, please contact the event organiser
for clarification.