Posted By Salus Hi James, 0xygen stored should be at least 3m's away from any acetylene / LPG vessels. LPG Regs / the min separation distances for storage of 400 to 1000 kgs of LPG is a max of 3m's to any boundary building or fixed ignition source. I would only have on site as much as I would use for the day, if known. if you cannot accommodate these distances then I would advise as far away as posible,protect by a fence, heras is OK, protect from weather, ensure floor is level and compacted,display signage "no smoking" etc and set up procedures at induction to make all aware. If space is restrictive cover over with fire resisting sheet,set up a permit to work and monitor. Best is to remove the storage vessels before any hot work commences hope this is of help

Posted By Kevin Drew James, I have to disagree with some of the advice from Salus. The minimum separation distance between oxygen and acetylene cylinders is NIL. In my experience LPG doesn't often get used for welding. If it did the minimum separation distance would be 3 metres. Between cylinders and "smoking, naked flames, sources of ignition and heat sources" the minimum separation distance for acetylene is 3 metres and for oxygen its 1 metre. The advice for LPG is valid but do you have >400 kg of LPG? For 400 kg the minimum separation distance is 1 metre. All of this information is availble in the British Compressed Gases Assosication Guidance Note, GN 2, Guidance for the Storage of Gas Cylinders in the Workplace. Hope this helps. Kevin Drew