Posted By Richard_Sams
Can anyone tell me if sparks are created or sufficient heat generated when saw cutting concrete that would present a significant risk when carried out 5 to 10 metres from flammable gas bottles?

Posted By Chris Packham
Surely, if the gas bottles are not leaking then any sparks will simply impact on the metal outer surface. It is highly unlikely that the heat from the sparks could heat up a bottle to the point where the gas pressure would cause it to burst. Thus the risk of fire must be limited to the effect of the sparks either on the paint on the bottles (unlikely) or on any other flammaable material nearby (much more probable).

Of course, if the bottles are leaking, or are connected to equipment with hoses that might be damaged by the sparks, then this is a different situation.

Chris

Posted By Bob Baynes
If the saw is elecrtrically powered, it will be generating some sparks internally at the brush - commutator interface. Some sparks exist fleetingly or are hidden beneath the blade, at the bottom of the cut. It is possible for gas to be pulled in there and be ignited. Just what is in those bottles? How many are there? What are they being used for? If they have a gas welding or burning torch attached and are being used, you are not adding much to the risk. If they contain hydrogen either stored or manifolded for supply elsewhere I would not go near them with any potential source of ignition. There are an infinite number of possibilities here. I suggest you contact the gas supplier who will be able to advise you as to the correct procedures to use.