Scared Silly
Contributor
To whit, a very good example of cylinders that can not be re-hydro'ed are the old round bottom AL cylinders. I can not remember who made them but they are no longer commercially serviceable.
Tanks...which ones can't be re-hydro'ed?
- Thread starter Hemlon
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captain
Contributor
Again we are missing the intent of the regulations. The old Navy round bottom tanks can be hydroed and if they pass they can be used as long as it is not "in commerce". The regulation are all about the transportation of hazardous materials and the container the material is carried in. If the container doesn't have a DOT specification it can't be used "in commerce".
captain
Contributor
Again we are missing the intent of the regulations. The old Navy round bottom tanks can be hydroed and if they pass they can be used as long as it is not "in commerce". The regulation are all about the transportation of hazardous materials and the container the material is carried in. If the container doesn't have a DOT specification it can't be used "in commerce".
Just as the scuba industry has accepted the VIP as an industry standard so have they accepted the DOT regulations even in particular instances where they don't necessary apply.
Nothing in DOT regulations requires you to have your personal tanks hydroed but if you can't fill them yourself then you have to meet the scuba industry accepted DOT standard to have them filled just as you have to meet the yearly VIP standard which is not a DOT regulation.
Know anybody who has a set set of the Navy round bottom twin 90's they want to sell.
Scared Silly
Contributor
We are probably picking nits here as I think we are saying the same thing. Perhaps the first, if a cylinder is not used in commerce a hydro is not needed. This may not be smart but ...
Second, what would a hydro shop do if presented with such a cylinder? Would they perform the hydro? If so would they mark it? I do not know.
Second, what would a hydro shop do if presented with such a cylinder? Would they perform the hydro? If so would they mark it? I do not know.
captain
Contributor
I would simply ask them to test it and tell me if it pass or failed. I don't need the stamp and they may not want to stamp it, I just want to know that it passed.
matt t.
Contributor
My statement was based on my limited knowledge and experience that any average diver may run into. I'm not aware of any SP or E-series tanks that the permit hasn't been renewed for, and I'm also not aware of any composite scuba tanks that are past a 15 yr wear date. If you can point me any examples I'd be interested for my own education. Thanks
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My statement was based on my limited knowledge and experience that any average diver may run into. I'm not aware of any SP or E-series tanks that the permit hasn't been renewed for, and I'm also not aware of any composite scuba tanks that are past a 15 yr wear date. If you can point me any examples I'd be interested for my own education. Thanks
I am pretty sure Walter Kidde's SPs were never renewed. AL80s made by them under a SP may not be used in commerce, nor re-hydroed. However they also made some AL80s to the 3AL standard and those are fine.
Norris let their HP exemption expire last year (or maybe 2007) by accident and boy did they catch h*ll for that since some cylinders got condemned by hydro facilities before anyone realized it.
Anyway the point is, having a SP or E expire is not that rare.
matt t.
Contributor
rgdodson54
Registered
Back in the '70s there were some fiberglass tanks that had expiration dates on them. They could not be HYDROED. I doubt you can even find any today. If I was looking for used tanks, I'd go with steel. Make sure it's in HYDRO and most importantly have someone do a VIP just to make sure there isn't any rust. I use 100 cuft 3500 psi steel tanks, made my pressed steel tanks.
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I have never seen a Norris tank or a Walter Kidde tank in 10 years of diving. Thanks for the examples though. I guess in some areas it's not as rare as I would have thought. Thanks!
Norris made a fair number of 72s back in the day. They left the scuba cylinder business with the rise of the AL80. They returned and started making steel E9795 tanks a couple years ago about the time PST crashed and burned.
Walter Kidde hasn't made a scuba cylinder in a decades+.
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