Bottled gas up again

[GeoffH]

3 hours ago, bastonjock said:

To check them properly  you need an ultrasonic probe , there isa minimum wall thicknesses required to maintain the integrity of the tank  ,also annually  the valve shoukd be removed and an internal inspections carried out ,any corrosion can be removed using steel ball beatings  and a machine thar rotates thr cylinders 

 

That sounds like a fairly intensive safety inspection program (and to be admired as such), I confess to not knowing what safety inspections are done on the bottles we use.