over fill a low pressure steel tank?

[g1138]

First of all, the hydro for an LP120 is 4000psi, not 4400. 2400 x 5 / 3.
Secondly, a 120 at 3000 is not 170cu' it's 136cu'
Thirdly, i'd put 4k in that tank without blinking an eye, too...

My example was with a Faber LP120 which fills to 2640psi. I don't see anything wrong with my math.

 

[Superlyte27]

the 2640 is with the + rating, but the actual fill pressure on that is 2400.

 

[HonuDiver1059]

I guess that's why I own a pair of old steel 100Lp It's not to hard to find a shop that that won't fill them to at least to 3500psi. I guess in the Great Pacific Northwest we just call more bottom time/more fun!! You do know that the US DOT governs the working pressure of these vessels and in most of Europe these same tanks are filled to working pressure 4000PSI.

 

[g1138]

the 2640 is with the + rating, but the actual fill pressure on that is 2400.

Wouldn't they fill it 10% higher in hydro as well, to justify the + stamp?
I'm splitting hairs really. I didn't realize that till later.

 

[aquaregia]

Wouldn't they fill it 10% higher in hydro as well, to justify the + stamp?
I'm splitting hairs really. I didn't realize that till later.

The plus rating is based on elastic vs permanent expansion, rather than running the hydro at a higher pressure.

 

[kwinter]

There's nothing wrong with cave fills, at least the reasonable ones. I don't like pushing LP tanks past 3200 or so. I always found it amusing during my cave training that every single aspect of the training was dedicated toward safety..... except tank pressure.

The bigger question I have about whether you should buy those tanks ($200 is not really a great price, but isn't ridiculous either) is how tall your friend is. I used to dive with those tanks. I'm about 6 feet tall and they hit my legs when I kicked. The tanks are huge and heavy. Make sure they can be handled comfortably before buying them. Mine are now used only for banking oxygen.

 

[LiteHedded]

There's nothing wrong with cave fills, at least the reasonable ones. I don't like pushing LP tanks past 3200 or so. I always found it amusing during my cave training that every single aspect of the training was dedicated toward safety..... except tank pressure.

The bigger question I have about whether you should buy those tanks ($200 is not really a great price, but isn't ridiculous either) is how tall your friend is. I used to dive with those tanks. I'm about 6 feet tall and they hit my legs when I kicked. The tanks are huge and heavy. Make sure they can be handled comfortably before buying them. Mine are now used only for banking oxygen.

because there's no impact on safety

 

[Wookie]

Burst disc? Why use that when a piece of lead crammed in the burst disc port will do nicely. I mean, if you're going to ignore the designing engineers safety recommendations, go for it. Don't be a pussy.

 

[LiteHedded]

Burst disc? Why use that when a piece of lead crammed in the burst disc port will do nicely. I mean, if you're going to ignore the designing engineers safety recommendations, go for it. Don't be a pussy.

im no pussy. mine are all steel

 

[Superlyte27]

My burst disks are 5250's. That works great for 4k fills.