If you're going to be using them within the same day, it's fine to leave them at operating pressure, but it is best to shut everything off (tank valves off first) and purge your hoses and regulators. Once you're done for the day, just open the valves on the torch one at a time until you can't hear any gas flow, close them back up, then close up your regulators to prevent any regulator shock when you next open up the tanks.

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