Faber steel 120s

[Zero]

Ever seen a tank go pop or one that has? Not a pretty site and i wouldnt want to be around when it goes. Kinda turns you off asking for big fills. I dont know about the rest of the world but our tanks in Oz have to have burst disks and they are a life saver. When they go they scare the sh*t out of everyone around and spray water out of the tub all over the place but most of the time no ones lost a limb or life. I have seen the results of an overfilled tank that was left in a shop that got hit by the afternoon sun. Burst disk blew and the tank went through the glass doors it was next to. No one got hurt and it caused a bit of damage but still way less than the tank going off.

Matt

[Packhorse]

I have seen the results of an overfilled tank that was left in a shop that got hit by the afternoon sun. Burst disk blew and the tank went through the glass doors it was next to. No one got hurt and it caused a bit of damage but still way less than the tank going off.

Matt

My question is what would have happened if the tank didnt have a burst disk. My guess would be.....nothing.

It takes a doubling of ABSOLUTE temp to double the pressure in a tank.
So if the tank had 300bar in it from an over fill at 20degC the tank would have to reach 180deg C or so to get to 400bar. I very much doubt a good condition tank would rupture at 400bar. I also doubt it would pass to many more hydros.
My understanding of burst disks is that there were more designed for liquified gas cylinders and for protection from tanks in fires. Europe do not use them for scuba.

[bgbill]

I have several Faber LP 120's that I regularly overfill, and have never had a problem, I have filled them to 3800 psi.

I have friends that have Fabers that get filled to 4200 psi, and never had a problem.

The tanks are tested to 10,000 cycles at 4,000 Psi before failure, I seriously doubt anyone is going to ever fill a tank anywhere near 10,000 times.

The tanks when they are cycled are done hydraulically, and very quickly, which I think would cause more stress in them.

The greatest chance of a tank failure is when it is being filled (that is why I have my wife fill my tanks ), so I can't see anything wrong with a dive shop not wanting to overfill a tank.

I would never, never, never overfill an aluminum tank.