Within the last 6 months my department has responded to 2 structure fires where home health care oxygen cylinders have exploded. In one case we were aware of the existence thru home owner reports and went defensive early due to the extent of fire in the structure. When the tank failed it was a violent explosion but resulted in no injuries. The last incident involved a tank in the garage that exploded violently and unexpectedly resulting in minor injuries to 5 firefighters. We are trying to establish a marking/notiifcation system for home health care oxygen so that we can avoid the possibilties of more disasterous consequences. Anyone else have experiences or procedures in place??