Perhaps you and
@KDAD are reading a different thread or you both need to work on your reading comprehension skills as I never once said the tank was flying around the shop. The tank DID NOT just tip over. Had it tipped over it would have been impossible to damage the knob and valve stem. There was nothing else near it that it hit. The tank was off the ground sideways and landed on the knob. A failed flip is the best way I can describe it.
Apparently you two think compressed gas is no big deal, but I wonder if you have small children or are willing to put YOUR face next to a burst disc letting go. I recall a recent thread on here where either a valve o ring extruded or burst disc let go at night and the op was in his garage trying to find the source among tanks and consequently put his hand in front of the gas escaping and it basically tattooed air into his hand and under his skin.
that is not what he is saying, he is saying that the damage (other than your valve) was the gas escaping, and it is not as dangerous as it may appear to somebody who has never experienced a burst disc failure.
That said, there is real danger, hearing, gas could blow something into a eye, gas could get a eardrum etc. The falling tank is a very real danger as well, because it isn't just falling, it has energy beyond weight and gravity behind, especially to a toddler.
The shop (and parents) should NEVER let children around he tank fill station, in fact in many places it's illegal to have kids around them under 16. Florida has laws regards that BTW.
My 10 year old has a literal office in my building and likes to hang around here, but the warehouse and fill station are off bounds, and she knows it.
When a burst disc goes, move away and stay away until there is no sound of gas escaping. The tank filler (who is supposed to be there while filling the tank, not wandering around the shop) should immediately shut down filling and vent the panel..and move away. Not futz with the tank. You may think it is a burst disc, it could be something else and potentially go boom. Also as you pointed out, gas under 3000psi of pressure will not just tattoo skin, it can do some really bad cutting as well