I have made a couple of Stirling engines and one steam engine, I test the boilers with water pushed by compressed air, no way would I use compressed air to test joints :O. Apparently there is a silicon you can buy that alot of people use inside metal tubes for pyro work, the only down side is they are thing and need changing now and then.
As a one off and considering the smallish amount of material I will leave the PVC with a sleeve added for now, when I do the charcoal I might swap to copper coated on the inside with something, not too sure yet, steel would be ok for bio beds. Copper I like working with but copper and some microbes are a bad mix as the copper is toxic to them, Brass would be great but chances of finding a brass pipe 4" diameter and 2 feet long are the same odds as finding a girlfriend that understands sheds and shed time.
Anyway back later as I have roofing felt to do on my shed and a new chair to install
, I wanted a balcony this year but never got around to it
I might post a pic later of my shed
As a one off and considering the smallish amount of material I will leave the PVC with a sleeve added for now, when I do the charcoal I might swap to copper coated on the inside with something, not too sure yet, steel would be ok for bio beds. Copper I like working with but copper and some microbes are a bad mix as the copper is toxic to them, Brass would be great but chances of finding a brass pipe 4" diameter and 2 feet long are the same odds as finding a girlfriend that understands sheds and shed time.
Anyway back later as I have roofing felt to do on my shed and a new chair to install
I might post a pic later of my shed