Although temp will increase the pressure inside the tank, there are a few things that will give you some comfort:
1. The tanks are over-engineered - as the article states. I don't know about CO2
tanks for fire extinguishers, soda machines, etc. But in hospital settings, the CO2
tanks are one & the same, they are differentiated by the threading on the neck so only a specific regulator will fit. At any rate, the tanks are rated at over 2000 psi (O2
tanks operates at 1600 psi). This is far higher than what the CO2
will reach with normal ambient pressure. <There should be a DOT number stamped on your tank. There should be a max. temp rating in that number. So you can sleep at night, you might just check the number & make sure it is higher than the max CO2
2. Most tanks have a pressure relief valve to prevent catastrophic failure.