That size, possibly a modified Schreckling gas turbine **LINK**

If the heating gas bottle size, then a Chastain style iron melting furnace: **LINK**

May be useful one day.

Regards,

Richard.

If you are worried about residual gas you can pump in water which gradually pressurises the remains, then let that out and repeat until 100% water then reverse with plain air to expel the water. It will then be damp inside so you must cut it up not use it as a pressure reservoir that will rust internally. Seem to often be used as basis for woodstove but really to thin to risk for that. Maybe ok as chimera outside.

Going slightly off the subject of your bottles. But still on gas bottles .

Our local scrap yard cuts in half the BOC acetylene bottles. Welds on 2 handles & flogs them as post  rammers.

I bought one without handles & have sliced off 3 – 3/4" lengths 5.5"  diam for rims for the front wheels & flywheel of my traction engine. They have 1/4" thick walls & I have enough for another 10 .- cost me a tenner.

Re calor gas bottles I have a small one ready to cut up, once i get the remaining gas out, & will cut it to give the rims for my rear wheels ( 10" diam).

Edited By Sam Longley 1 on 27/01/2017 13:30:38

Hi PaulR, these probably come under the Control of Pollution (special waste) Regulations 1980, so be careful where you dispose them and they may not be accepted at a scrapyard, pressurised containers and all that. Do you know if B&Q will dispose them or not?

Regards Nick.

A problem with reusing these 400g bottles is that they have essentially a Presta-style valve (like a high pressure bike tyre) in the top, with a stalk on the screw-on fitting that pushes it down. It only has a very small aperture which is fine for the intended purpose but would make it very hard to flush out or actually reuse as an air reservoir. You have to take this out which involves a bit of drilling, and though I was happy to do that on an empty oxy bottle I wouldn't be so cavalier on an empty propane one. Also the hole in the screw-on valve is tiny, so that needs a lot of modification (i.e. butchering…) to be usable. I'll post a photo when I get a chance. If you could get the valve out there's about a 6mm hole into the bottle, so one could fill with water through a thin tube to dsplace the rest of the gas.

Well they must have a death wish as acetylene bottles contain acetone as the gas is dissolved in this!! I wouldn't cut up an acetylene bottle for all the tea in China.

If you want to clean out a propane bottle you need to fill it to the brim with water which will push the gas out as it is a welling gas and is heavier than air.

WEEEEEEEEEEEEEEEE regs? they may well have to dispose of them same as batteries if you sell them.