LP tanks & plus ratings

[pants!]

I haven't had the balls or the burst disk to go that high with mine. I understand in the UK, these same Faber tanks are used at 4500psi on a regular basis.

This is incorrect.

Similar tanks (not identical) are rated for 232 bar, or almost 3500 psi. Not 4500.

 

[SDAnderson]

so you mean when I fill mine to 4 grand they are hold a lot.

Sometimes, how much is less important than how...reliably. Of course, if I had access to a compressor that could handle that load, I might think differently.

 

[RDP]

This is incorrect.

Similar tanks (not identical) are rated for 232 bar, or almost 3500 psi. Not 4500.

My comment about 4500psi came from the response a tech person from Faber sent me. Perhaps, I understood him incorrectly. I don't plan on pumping my tanks up anywhere near that anyway.

If you were refering to my math on the 4000psi in a LP95+ being incorrect. You might want to check again. (baseline .036 x 4000 = 144).

 

[pants!]

My comment about 4500psi came from the response a tech person from Faber sent me. Perhaps, I understood him incorrectly. I don't plan on pumping my tanks up anywhere near that anyway.

If you were refering to my math on the 4000psi in a LP95+ being incorrect. You might want to check again. (baseline .036 x 4000 = 144).

I edited the quote to make it more clear what I was referring to. Your math was fine.

Please post the response from Faber.

 

[RDP]

This was a common problem “in the old days” when your steel 72 would lose its + rating – 72 doesn’t sound that much different than 80, but when you dove with your AL80 buddies with your non-+ rated 72, it was actually about a 65...

Roak

Yeah, that can be a bummer. I didn't want to confuse my original question with the losing or keeping of the + rating at hydro discussion. I saw quite a bit of discussion on that in another thread.

 

[Leadking]

Use a search for "tank overfill" on Scubaboard and read all the comments

Every tank design by every manufacturer must pass a minimum of 10,000 hydro cycles without fail (6-10 times a minute until fail, new cylinder without corrosion or fatigue issues) as required by DOT
Faber makes no tank greater than 7 inches that can take 4000 psi under any regulation anywhere in the world

U.S.tensile strength (105,000-125,000 psi) is not the same as European tensile strength (135,000-155,000 as required by EN 1964 part 1 and ISO 9809 part 1) and I have test data that shows Faber cylinders delivered to us show a tensile strength of 115,000-123,000 psi (as required by DOT)

 

[Creed]

This was a common problem “in the old days” when your steel 72 would lose its + rating – 72 doesn’t sound that much different than 80, but when you dove with your AL80 buddies with your non-+ rated 72, it was actually about a 65...

Roak

Damn. I have the opposite problem. My 72's almost always end up overpressurized. I just checked the tank I got filled a few weeks ago. It was at 3000psi. I am not particularly worried that they will blow, but I am kind of concerned that they don't bother to check the tank's proper pressure. What else might they skimp on, if they ignore routine issues like this? Of course, I have also never been asked for a C card for air fills or gear rental.

 

[roakey]

Damn. I have the opposite problem. My 72's almost always end up overpressurized. I just checked the tank I got filled a few weeks ago. It was at 3000psi.

I'm talking about fills in the "old days" too. When I was thinking about buying my first cylinder, the consensus was "Don't buy one of those new AL80s because no one can pump to 3000 PSI!" My how times change…

Roak

 

[Atticus]

I'll second what others have said - an LP95 holds its rated volume at 2640. When you lose the + rating you get less than 95cf.

 

[DepthCharge]

Hell yeah, about 144cu.ft. each! I haven't had the balls or the burst disk to go that high with mine. I understand in the UK, these same Faber tanks are used at 4500psi on a regular basis.

What the hell is a burst disk? :laughing: