Thanks all!
Doesn't that invalidate household insurance?
Yes, seems that's correct, hadn't realised the pressure was so much less.
So apart from the possibility of freezing the propane, would there be a problem leaving the cylinders and regulators out in the open? Seems the simplest method...
I use oxygen and propane occasionally in my garage (part of my house).
Not that happy having the propane there, even with flashback arrestors on the regulator.
I'd like to drill a hole through the cavity wall and stick the propane at least outside, but not sure how's best to do this, where to...
I'm planning to make a batch (50-100) of motorcycle sump-guards / bash-plates from 5mm plate.
Data sheet on 5083 says 'not recommended for use in temperatures in excess of 65 °C'. Possibly on rare occasions (stuck in traffic on a hot day etc) this could be exceeded locally, though not probably...