If you have ever taught a LOTO course, you know that you will always get the questions… “Is ___ psi a hazardous energy source?”. Regardless of the gas’s inherent hazard(s), we should always answer by saying “Zero = Zero,” and in LOTO, we are required to achieve a zero energy state.
So, any psi of a gas is a form of energy; trying to define it as non-hazardous when it is anything above ZERO psi is a non-argument regarding safety.
However, I always use real-life examples in my training and walk the class through some scenarios, and in my courses, I can almost guess how these will be answered.