low, mid and high pressure steel cylinders....
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There are alot of steel tank sizes made, so here is part of the information you are looking for.
Low pressure tanks 2400 psi with a + rating to 2640 psi. common sizes lp85, lp95, lp120 cu ft.
medium pressure 3180 with a + to 3498 psi and 3442 rated tanks. common sizes 80, 100, 120, 130 cu ft.
high pressure 3500 psi common sizes 100, 120 cu ft.
Here is a link to some tank specs that may help you .
Scuba Cylinder Specifications from Tech Diving Limited - 928-855-9400
Good luck,
Jim Breslin
Low pressure tanks 2400 psi with a + rating to 2640 psi. common sizes lp85, lp95, lp120 cu ft.
medium pressure 3180 with a + to 3498 psi and 3442 rated tanks. common sizes 80, 100, 120, 130 cu ft.
high pressure 3500 psi common sizes 100, 120 cu ft.
Here is a link to some tank specs that may help you .
Scuba Cylinder Specifications from Tech Diving Limited - 928-855-9400
Good luck,
Jim Breslin
SparticleBrane
Contributor
Just to add to what was said above -- several decades ago, steel tanks were rated to 2250 + 10% = 2475. Some even older than that were rated to 1800, I believe.
The 2250 tanks are more than likely steel 72s, there are a zillion that are still in service, and you can get them cheap more than likely.
The 2250 tanks are more than likely steel 72s, there are a zillion that are still in service, and you can get them cheap more than likely.
Without getting into the whole "mid v. high" debates with old 3500psi tanks, nowadays 3442psi tanks are considered high pressure.
Generally, only steel tanks are categorized as high or low pressure. The tricky part about low pressure steel tanks is that their capacity is including a 10% overfill, which is qualified with a "plus rating" during hydro. So an LP80 holds 80cuft of air at 2640psi, even if the tank can lose its plus rating in a subsequent hydro and then be rated to only 2400psi. At 2400psi, that LP80 only holds 73cuft of gas.
Aluminum tanks aren't designated as low or high pressure, but typically are rated to 3000 (or rarely, 3300) psi.
Generally, only steel tanks are categorized as high or low pressure. The tricky part about low pressure steel tanks is that their capacity is including a 10% overfill, which is qualified with a "plus rating" during hydro. So an LP80 holds 80cuft of air at 2640psi, even if the tank can lose its plus rating in a subsequent hydro and then be rated to only 2400psi. At 2400psi, that LP80 only holds 73cuft of gas.
Aluminum tanks aren't designated as low or high pressure, but typically are rated to 3000 (or rarely, 3300) psi.
Yep, that's exactly it: the way tanks are named in the US, the named capacity is "at rated pressure."
The tank sizes will be different. By their nature, high pressure tanks will have less absolute volume than low pressure tanks (they squeeze the same amount of air into a smaller space). Usually that means is they'll be shorter, or narrower, or the walls will be thicker, or they'll be made of heavier, stronger alloys that withstand more pressure (but with materials today, maybe they'll be made of lighter, thinner alloys than LP tanks). But as a general rule, an HP tank will be noticeably smaller than an LP tank at the same rated capacity.
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