Quite an informative and at times entertaining post. Great thing about SB.
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over fill a low pressure steel tank?
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Six Feet Under
Contributor
I overfill my steel doubles on a routine basis. The HP100's somehow got pumped up to 3900 last time (and then were stored in a hot garage, so I'm kinda lucky they didn't blow the disks I'm thinking) without the fill guy noticing. Last time both sets got filled to 3000psi... not worth the effort driving 45 minutes to get fills to make sure I have gas when I arrive at the dive site if they're gonna be 200-600psi short!
If I fill a set of LP80's (rated 2460) to 3200psi, I get 208.2 cubic feet of gas on a fill. Filling the HP100s (rated 3442) to 3600psi, I get 209.2 cubic feet of gas.
I'd like to move to LP85's across the board - they're a little longer, which I think would help my trim (I have a long torso and the 80s and 100s I have now are short, leaving me head-heavy), and hold near the same amount of gas when filled to 3200psi.
He is, isn't he? I was just by there dropping off some AL30's I sold this past weekend but unfortunately he wasn't there.
If I fill a set of LP80's (rated 2460) to 3200psi, I get 208.2 cubic feet of gas on a fill. Filling the HP100s (rated 3442) to 3600psi, I get 209.2 cubic feet of gas.
I'd like to move to LP85's across the board - they're a little longer, which I think would help my trim (I have a long torso and the 80s and 100s I have now are short, leaving me head-heavy), and hold near the same amount of gas when filled to 3200psi.
He is, isn't he? I was just by there dropping off some AL30's I sold this past weekend but unfortunately he wasn't there.
olphart
Contributor
I got a pair of LP85's with the idea of getting them filled to 3000 or so..Ha! No one around here will over fill them. 
Basking Ridge Diver
Contributor
Can you explain your formula or was that a typo?
(Actual Fill/Rated Fill * Rated Volume or (3200/2640)*80 = 96.96 cu ft)
** 2400+10% would be 2640 at 80 cu ft **
Doubles would still only give me 193.92 cu ft.
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Your hydro guys are wrong.
Since the thread Scuba Cylinder explodes in the AI, which as you know I participated in, I've been doing a ton of investigations which I'll start another thread on soon.
However, as stated in that thread. A hydo test stretches the tank - The tanks can only stretch so far, and must then return back to dimension. This dimension is greater than the starting size. The tanks never go back to their original size.
Six Feet Under
Contributor
I said 2460, not 2640
Basking Ridge Diver
Contributor
Which tank is 2460 with 80 cu ft?
Most are 2400 with 10% that I am familiar with..
Scuba Cylinder Specification Chart from Huron Scuba, Ann Arbor Michigan
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Bob DBF
Contributor
Post a picture of it beside a Al 80, with closeups of the neck stamps and I'm sure we can sort it out.
Since, until recently, the tank size was not stamped into the neck, it is easy to get bad info on tank size. I had a friend get a couple of Faber mid pressure tanks that turned out to be 72's rather than the 80's that he was sold. The same could happen with pressure if the neck stamps were unclear and/or one was directed to the wrong numbers.
Bob
Since, until recently, the tank size was not stamped into the neck, it is easy to get bad info on tank size. I had a friend get a couple of Faber mid pressure tanks that turned out to be 72's rather than the 80's that he was sold. The same could happen with pressure if the neck stamps were unclear and/or one was directed to the wrong numbers.
Bob
I think you are being too picky on the comment for its intent. I over fill my tanks. they recover lets say 99.9 % of the expansion. for lay people they recover fully. The over filling and reduction of the 10.000 fills i got from faber them selves, not the hydro guys. I dont think there is anyone that believes that anything is possible of FULL 100% absolute recovery. That conversation with the hydro guys was started because of attempting to get a + rating on hte tank. They said they do not do + stamps. Apparently the + is a scuba thing and they don't do them, as their main business is not scuba tanks.
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