: : I would just call crossfire or pmi and ask them what the story is. All of the "facts" above contradict what I was told in the past. Who is right? Who knows. But my 3000 tank has a 5000 disk and my max-flow 4500 has a 7500psi disc. Neither one has ever failed or blowed up in the trunk of the car, so I am happy. : : : : : *Just a clarification on 3000 psi. These tanks are tested to 5/3 rated pressure which is 5000 psi. not 7500#
: : : : : Hydro2go
: : : I think your mistaken because you wouldn't have a burst disc rated to the tested pressure of the tank(You say 5000).A system like that would be useless.What good is a burst disc,which is a SAFETY Feature be set at the maximum safe pressure of the tank.Would it not make sense to set it a little lower than the max pressure because if it did fail you would have absolutely no margin of safety before the tank blew up.That is why all burst discs are set at a lower pressure than the maximum safe pressure of the tank.There is not a burst disc that I have heard of that is set to the same pressure as the max pressure of the tank.(Not the rated pressure).I hope I explained this right and if you can find a tank that has the burst disc the same pressure as the max pressure(not rated pressure)I would like to know who makes it.Maybe check your facts again.
: ** Actually I did check and verify that the burst discs are set at test pressure. However this is not fail pressure because most tanks have a 4:1 safety factor built in. I would personally prefer to have a lower burst disc pressure for safety while filling but the CGA sets the rating not the manufacturer.
Odd. In my recent airsmithing certification class, we were told that the burst disk should be rated lower than the maximuum pressure of the tank (5/3 rule as you mentioned). For 1800psi CO2 tanks, this meant 3K burst disks. However, we were also told that the burst disk rating system was in transition--since the 3K burst disks actually blew out at 2200psi...
Maybe there is something similar going on with the higher rated burst disks for HPA?
The burst disk on my new CenterFlag Hyper Flow tank/reg combo does not have it's rating stamped on it. :-/
I would expect that so long as you were over working pressure by a reasonable and under max rating, you would be good to go when doing replacements. Though of course, you will have to deal with the tanks that are new and have the higher pressure rupture disks as is.
=RT=
(It really surprises me at times how ignorant people in this industry are of the dangers of high-pressure gasses and vessels. Like the people who keep talking about the "cradles" to flip over bulk CO2 tanks so you don't "waste any CO2". *shudder* Can you say "rocket"?)
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