As I mentioned previously, I have two acetylene tanks, 145 CF and 397 CF.
So I bought some O/A kit that includes a regulator, among other things.
Here's something that concerns me: the 397 CF tank, seems to leak acetylene from the seal between regulator and tank. The symptom of it is that the high pressure gauge shows pressure that declines relatively rapidly if I close the tank valve. I would say most pressure is lost in one minute. This makes me concerned since acetylene is explosive.
Here's my findings:1) Quick pressure loss with tank valve opened and then closed, happens on the 297 CF tank
2) it does not happen with the 145 CF tank, or at least it is extremely slow3) The rate of loss on 397 CF tank seems to depend from how tightly I tighten the connecting nut. The tighter, the slower is the leak. I am not sure how hard I can push that brass nut, but my guess is not too hard. I used perhaps 50 Ft/lbs or so of force.
Any thinking on this. Thanks.