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I have a friend whom wants to buy a steel 120 L.P. used, but in hydro & visual. The selling owner runs a scuba shop and said he had een over filling the tank. He says steel tanks don't stretch much and if one fillis the L.P. to 3000 lb you get almost 170cuft of air. I thought the neck of the tank could be damaged by this over fill, he says not to worry. He wants $200.00 for the tank, should my friend buy it? Thanks for your opinions!!
Tanks get filled to 5/3 their working pressure during hydro, so a Faber LP 120 with working pressure of 2640psi will be filled to 4400psi during hydro.
What the owner did is often called a cave fill, some cave divers will do that for the extra gas. The tank should be alright, I personally don't like to fill LP's that high just based on principle of the posted working pressure, but it's not something that's going to make that tank explode on it's own.
You could suggest to take the tank in for another visual at your expense. If it passes you pay the $200 minus cost of visual. Just a suggestion if your friend really wants the tank at that price.
I don't know enough about tank buying to tell you if you're getting a deal or not.
Overfilling LP tanks is perfectly fine (from a pragmatic point of view). I've got a set of 104's thats older than I am (not that I'm very old, I'll leave that to Litehedded) thats been overfilled from day one. You've got nothing to worry about there. If it looks good on the inside, the threads are in good shape, and it passed hydro, go for it.
Now, I would worry about being able to swim up that heavy azz tank from the bottom if your BC failed. That might be an interesting experience for you. Check out the concept of a 'balanced rig'.
...and the days go by, water flowing under ground, into the blue again, into the silent water, under the rocks and stones, there is water underground... - talking heads
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...
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