[Phyrxes]

To get permission to build and use ours we had to get the okay from not only the building principal but also "Risk Management" or what ever your school division calls the department that handles safety and security.

We made sure that our plans and materials usage met or exceeded OSHA specifications for containing compressed gasses.

Everything that contains pressurized gas is either commercially produced and rated to a pressure far exceeding what we are putting it or is soldered metal pipe. The only plastic pipe we ended up using was the barrel.