NWGratefulDiver:
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High Pressure vs. Low Pressure Steel?
- Thread starter raposarose
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The Fresh Prince
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Also, if you are interested in using steel cylinders for many years, avoid chronic overfills. It's not a short-term problem, but over the course of years your cylinder walls will lose their elasticity ... which will cause them to eventually fail hydro. Avoiding overfills minimizes this as a potential issue.
... Bob (Grateful Diver)[/QUOTE]
Hmmm, as the PST's are rated for 10000 fills to hydro pressure, not sure what you mean by this. If I get that many dives on my cave filled tanks, I will be in Nirvana.
... Bob (Grateful Diver)[/QUOTE]
Hmmm, as the PST's are rated for 10000 fills to hydro pressure, not sure what you mean by this. If I get that many dives on my cave filled tanks, I will be in Nirvana.
OP
raposarose
Guest
Thanks everyone for all of the information. It's quite helpful, though having more options and understanding the set of trade-offs more still makes it not totally easy.
Right now the best sounding tanks for me are the (along with what I gather are advantages/disadvantages):
PST E7-100 -- Smaller profile and weight than LP 100, downside is maybe I won't get full fills, negatively buoyant when empty
Faber 100 -- Better chance of full fills, same size as aluminum 80, low pressure may be easier on equipment, very negatively buoyant
PST E8-119 -- Even with less than a full fill still yields plenty of air, same profile as the Faber 95, disadvantage is that it is the heaviest of the three and most expensive.
Ok, so I am narrowing down on a choice. Is it just personal preference for these trade-offs now, or does anyone think I am should eliminate one of these options? Maybe the 119 is overkill... The whole debate about which is more likely to rust on the inside that I found while poking around elsewhere was a bit dizzying...
Thanks again!
Right now the best sounding tanks for me are the (along with what I gather are advantages/disadvantages):
PST E7-100 -- Smaller profile and weight than LP 100, downside is maybe I won't get full fills, negatively buoyant when empty
Faber 100 -- Better chance of full fills, same size as aluminum 80, low pressure may be easier on equipment, very negatively buoyant
PST E8-119 -- Even with less than a full fill still yields plenty of air, same profile as the Faber 95, disadvantage is that it is the heaviest of the three and most expensive.
Ok, so I am narrowing down on a choice. Is it just personal preference for these trade-offs now, or does anyone think I am should eliminate one of these options? Maybe the 119 is overkill... The whole debate about which is more likely to rust on the inside that I found while poking around elsewhere was a bit dizzying...
Thanks again!
OP
raposarose
Guest
I just ordered the PST E7-100. Thanks for all of the input! It was hard to find one of those in stock somewhere. I am looking forward to getting it, then getting out and diving it! The overall weight/buoyancy characteristics and the finish of the E7-100 are what convinced me to go for that one. Plus, I don't have to readjust my straps if I go somewhere with only Al-80s.
Cheers,
Cheers,
Good moveraposarose:
I bought 2 E-7's a while back and they've been great. I went wreck diving in NC, deep dives and was coming up with a 1000 psi. after some decent dive times. The boat guidlines were to dive the rule of thirds so these tanks were perfect.
I'm sometimes getting 2 dives a tank on local / shallower dives. Plus 6# or so off the belt. All good. Glad I bought 'em when they were still relatively cheap.
c555
Contributor
I have 2 worthington x7-hp 100. They are shorter than 80's and hold more air. The one problem is I usually don't get a full fill when it's cooled, but at 3000 psi I still have about 87 cf. The next tanks I get will probably be low pressure because it is easy to get a fill and they can be overfilled a little.
wmspdi:
How does a 19 inch pony ride? Doesn't your pony get gittery at those depths? Mine get spooked when a snake crawls through the pasture and they are 16 hands.
WediveBC:
Are you disputing it?
Filling to hydro pressure (3457 or whatever on the E-series) is not overfilling. Filling a 3500 psi rated tank to 4000+ psi is definately shortening the life of your tank.
CD, you just responded to a post almost 2 years old
limeyx
Guest
Hmmm, as the PST's are rated for 10000 fills to hydro pressure, not sure what you mean by this. If I get that many dives on my cave filled tanks, I will be in Nirvana.[/QUOTE]jjsteffen:
I thought it was that (by design) they were supposed to *fail* at around 10,000 fills at hydro pressure. Also, they are not held at that pressure for very long during the testing.
That said, I dont see a huge problem overfilling an LP to say 3000 hot. The original poster said *chronic* overfilling -- which might mean different things to different people.
limeyx
Guest
raposarose:
I use the PST E7-100, LP80 (same size just LP instead of HP), Worthington X8-119 and they are all fine tanks. If you want to beach dive, the 119 might be a bit much to carry, but I dont seem to have any huge problems with it.
I try to avoid painted tanks if I can, and all the fabers I have seen are painted.
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