How do these steel tanks look?

[Keith.M]

Correct, of course there is no such such thing as premixed NITROX. NITROX means a mixture of O2 and N2 that is used for breathing. The term has nothing to with how it is made. NITROX can be made by PP blending, via continuous blending, or from a membrane system. All of which can then be banked.

Overall both stickers are BS and just another example of the piss poor self regulated scuba industry when it comes to cylinders.



Actually not, as there is no standard for the filling an non O2 cleaned cylinder with banked nitrox. Yes many shops do it, yes they get away with it, but there are safety issues.


For the OP. IMHO the cylinders are worth at most $200 each. There is no plus rating on them as there are 3442 or 3500 psi cylinder.

I am pretty sure you knew what I meant.

But yes, I guess some shops do and some shops don't. The only shop I know that has banked 32 does...

Thanks Jim, I did not notice how the sticker had the two seperate distinctions. One side of O2 cleaned and the other for premix.

 

[Dr. Lecter]

IIRC Asahi cylinders are 3500psi cylinders which mean 7/8" UNF thread and 300 bar DIN only valves. So you can not put a 3/4 NPT valve on them and use a yoke reg.

Looking at the picture of them side by side, I'm confident they're both the same neck diameter and that neither one is 7/8".

 

[halocline]

I wouldn't buy those tanks for $750. Can you really sell what you have for that amount, or is that wishful thinking? As scared silly pointed out, there are valve issues with the old genesis 3500 PSI tanks, and at least one of these appears to be that. I did see TP 5250 which indicates a 3500 PSI tank with a special permit for 150% hydro pressure rather than the 3AA standard of 5/3 test pressure. I'm not sure but I think that's what the old genesis tanks were.

What might be worth $750 IMO would be three faber or worthington HP100s, the special permit tanks with 3442 PSI service pressure, in excellent condition. Those tanks are versatile, don't weight too much on land, and are only a couple of pounds negative empty. And they can take any standard valve or manifold. But other than that I'd probably walk away, unless what you have ain't selling anyway.

 

[Scared Silly]

Looking at the picture of them side by side, I'm confident they're both the same neck diameter and that neither one is 7/8".

Could be but I have never known the Asahi to be anything but 3500 psi thus 7/8" 14 UNF cylinders. Also I noticed that XS Scuba is making their safety hand wheel value for 3/4 and 7/8 cylinders:XS Scuba Valves. So certainly possible that the seller replaced with both sizes of valves.

Regardless something for the OP to know about and to check for them self.

 

[Dr. Lecter]

Could be but I have never known the Asahi to be anything but 3500 psi thus 7/8" 14 UNF cylinders. Also I noticed that XS Scuba is making their safety hand wheel value for 3/4 and 7/8 cylinders:XS Scuba Valves. So certainly possible that the seller replaced with both sizes of valves.

Regardless something for the OP to know about and to check for them self.

Interesting that these "[FONT=Verdana,Arial,Helvetica,sans-serif]7/8" - 14 UNF small" valves XS is offering are 4350psi rated while the old Genesis 7/8" valves are 3500psi. Are they really the same valve threading? If so, I need to get some non-angled valves that will fit my old Genesis HP100s [/FONT]

 

[KD8NPB]

Could be but I have never known the Asahi to be anything but 3500 psi thus 7/8" 14 UNF cylinders. Also I noticed that XS Scuba is making their safety hand wheel value for 3/4 and 7/8 cylinders:XS Scuba Valves. So certainly possible that the seller replaced with both sizes of valves.

Regardless something for the OP to know about and to check for them self.

We get Asahi from Cramer-Decker.

Their new cylinders are 3442 psi w/ 3/4 NPSM threads.

 

[Scared Silly]

Interesting that these "7/8" - 14 UNF small" valves XS is offering are 4350psi rated while the old Genesis 7/8" valves are 3500psi. Are they really the same valve threading? If so, I need to get some non-angled valves that will fit my old Genesis HP100s

Something that I have been impressed by with XS Scuba is that they are making valves for old 1/2 tapered cylinders as well as 7/8 UNF cylinders. While I have no need for either it is nice to see them being made to modern standards.

We get Asahi from Cramer-Decker.

Their new cylinders are 3442 psi w/ 3/4 NPSM threads.

Thanks good to know. I am used to seeing the Sherwood/Genesis versions which are all 3500 psi.

 

[uncfnp]

MrChen, all other issues aside, that's just too much for these tanks if your trade is a realistic value. For comparison, I paid 400 for 2 much newer and near pristine condition Asahi HP 80 tanks from my LDS. They are great tanks but do average about 2 lbs more negative than comparative Worthingtons.

---------- Post added December 5th, 2013 at 11:22 AM ----------

Another bit of unsolicited advice. Buy the tanks you really want, even if you pay a few more dollars. I know you have been looking for that great deal but if you only plan to own a few tanks, make your purchase count.

 

[MrChen]

I appreciate all the great feedback. I knew you guys would come through . The wealth of knowledge and willingness to share it on this site is awe inspiring.

I should be able to get anywhere from $650-$850 for my item. I'm going to decline the offer.

 

[WB2GLP]

Tanks were hydro tested at Hydro-Stat, Inc. in Deerfield Beach, FL 33441. You shouldn't have any issues with testing in the future if you take them back there.

Speaking of the future...are the tanks marked with SP 12079? If so, you may want to check with Catalina Cylinders to see if they plan on renewing the special permit since it expires January 31, 2014. It's been renewed in the past several times and it may be again. I don't know. Just throwing that out there.

You will always have that special permit as a potential game changer in your future should you buy these tanks. Without a current special permit, they can't be re-hydro tested.