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Scuba Forum / General / July 2007Creating Cascade System
There's a local company that is going out of the helium supply business and they have a few tanks that are out of hydro that they are liquidating... Some are 244 cu-ft and others are 300 cu-ft... They have some smaller ones too... If someone was wanting to create a cascade system for filling tanks (either He or O2), what would be the best number of tanks to have for the particular gas in question? If someone was wanting to create a > cascade system for filling tanks (either He or O2), what would be the > best number of tanks to have for the particular gas in question? You gonna do Helium? Catch me, I've just fainted....... > If someone was wanting to create a > [quoted text clipped - 4 lines] > > Catch me, I've just fainted....... That explains why the seismograph jumped in Virginia. >> Catch me, I've just fainted....... > That explains why the seismograph jumped in Virginia. Either that, or it registered the reason he's asking....... > If someone was wanting to create a > > cascade system for filling tanks (either He or O2), what would be the [quoted text clipped - 3 lines] > > Catch me, I've just fainted....... Major palpitations... > You gonna do Helium? > > Catch me, I've just fainted....... The tanks are currently for helium, but I might replace the CGA-580 valves with the CGA-540 valves for O2... It's also possible that my gas supplier will swap out the tanks even for prefilled O2 tanks... I have a smaller O2 tank that I use for night flying or flying at altitude... Being able to refill it from larger tanks would be cheaper... There's also the case when some metal needs cutting and I can hook up an oxy-propane rig with the equipment that I already have on hand... Or maybe I just want to add more N2 to the mix to get a better narc... <evil-grin> Maybe a bit of Argon to take the edge off? Seriously though, I see them as more likely to be used as O2 tanks, but considering the price, I might get some for helium tanks also... Of course, the only place close that might see any benefit in the use of helium would be a deep dive at Lake Travis, but considering it is cold, dark, and doesn't have that much to see, I don't see that as being much of an enticement... No matter what gas I'm going to be using, it still becomes an issue of refilling smaller tanks from a series of more economical larger capacity tanks... >If someone was wanting to create a >> cascade system for filling tanks (either He or O2), what would be the [quoted text clipped - 3 lines] > > Catch me, I've just fainted....... When I first read that, I saw farted. And thought BFD.  Signaturedillon Broadway Photo sucks. Ask me why. On Jul 14, 5:29 pm, Grumman-581 <grumman...@DIE-SPAMMER-SCUM- gmail.com> wrote: > There's a local company that is going out of the helium supply > business and they have a few tanks that are out of hydro that they are > liquidating... Some are 244 cu-ft and others are 300 cu-ft... They > have some smaller ones too... If someone was wanting to create a > cascade system for filling tanks (either He or O2), what would be the > best number of tanks to have for the particular gas in question? Best number of tanks is always one more than you have. Ideally you'll want the a ton of volume in LP and less in HP. Brian Edmonton, Alberta > Best number of tanks is always one more than you have. > > Ideally you'll want the a ton of volume in LP and less in HP. I believe that the tanks are 2500 psi service rated... I believe that the company wants $40 for the 300 cu-ft tanks... Since they were helium tanks and since helium tanks probably are used mainly for balloon stores, I don't see them as having been abused much... Probably kept inside their entire life... I'm going to stop by his company on Monday to take a look at 'em... Even though they're out of hydro, my gas supplier will likely just swap them out for his current tanks anyway... I can probably even get him to do an even swap for an O2 tank of the same size since it's just the valve that is different... > > Best number of tanks is always one more than you have. > > [quoted text clipped - 10 lines] > O2 tank of the same size since it's just the valve that is > different... If they are 300 cu ft tanks, the are likely T bottles, and should be rated to 3500. > There's a local company that is going out of the helium supply > business and they have a few tanks that are out of hydro that they are > liquidating... Some are 244 cu-ft and others are 300 cu-ft... They > have some smaller ones too... If someone was wanting to create a > cascade system for filling tanks (either He or O2), what would be the > best number of tanks to have for the particular gas in question? 7,206. Failing that, however many you can afford to own and keep charged. (More is better but there are limits... ;-) -- John Eells > 7,206. > > Failing that, however many you can afford to own and keep charged. > (More is better but there are limits... ;-) Damn, he's only got about 70 of them... Guess I'll have to make do... <grin> > There's a local company that is going out of the helium supply > business and they have a few tanks that are out of hydro that they are > liquidating... Some are 244 cu-ft and others are 300 cu-ft... They > have some smaller ones too... If someone was wanting to create a > cascade system for filling tanks (either He or O2), what would be the > best number of tanks to have for the particular gas in question? The question is not precise enough, but... All depends how much do you use. If you run a dive shop with 20+ TMX divers filling their tanks with you every day, perhaps you would need much more, but normally between 3-5 should be reasonable. First you should calculate your needs in volume of the gas you will use. Second you take into consideration that making a cascade with less than 3 tanks has limited sense, because if you have less than 3, than too much of the gas is wasted. If you have more than 5 and you don't have that big demand - it is going to be too expensive (especially in case of helium). This is applicable also in case you want to have a air or nitrox "bank". I have seen a "bank" made of 3 tanks, but also the one having about 10 (with 2 huge compressors). The other matter to consider is if you want/have to "own" your tanks or you can "rent" them. Once you drain one, you give it to the filling station and get a new full one instead. If you "rent" the tank, you simply give the empty one to the filling station and get the full one in return. If you "own" you would either have to go to the fill station 2 times: first time to drop one empty tank, second time to colelct it full or consider to have at least one tank spare and have one of your tanks all the time "being filled" in the filling station, so you can collect it when you bring them an empty one. All depends how far you have to ge to the filling station, what is the cost of the tank, etc. Hope it hepls. BR Shrek > The other matter to consider is if you want/have to "own" your tanks or > you can "rent" them. Once you drain one, you give it to the filling [quoted text clipped - 6 lines] > you bring them an empty one. All depends how far you have to ge to the > filling station, what is the cost of the tank, etc. I snipped information that probably was pretty good in order to get to this part. I don't have an O2 or He bank, but I do have an Oxyacetylene Welder. I own my own tanks, both oxygen and acetylene. The process, for me, is not as you describe it. Just like those that rent tanks, I drop mine off and pick up a full one. The gas provider completes paperwork at that time to transfer ownership of my tank to him and his tank to me. I leave with a different tank that I now own. There are two advantages of owning the tank, at least in my experience. First, and primary, I can take my tank to any gas provider I choose rather than being constrained to return it to the company that owns the tank I'm using. Second, there's no time period during which I have to use the gas without incurring an additional charge. Owning tanks works best for me. YMMV. Lee <snip> I had contacted the owner of the store on Saturday... He said that the store would not be open until Monday and I could stop by and check out the tanks at that time... I drove over there this morning... He said that none were available now since someone had sent him and email offering to buy all the tanks from him a bit earlier this morning... If the guy doesn't show up with the check by Wednesday, he said that he would call me... Bummer... > <snip> > [quoted text clipped - 5 lines] > If the guy doesn't show up with the check by Wednesday, he said that > he would call me... Bummer... Should have just said, "Tanks but no tanks". > <snip> > I had contacted the owner of the store on Saturday... He said that the > store would not be open until Monday and I could stop by and check out [quoted text clipped - 3 lines] > If the guy doesn't show up with the check by Wednesday, he said that > he would call me... Bummer... I'll say. By the way, if you're going to leave "Lee Bell wrote" in the post, please be sure there's something in it that Lee Bell actually wrote. 8^) > I'll say. By the way, if you're going to leave "Lee Bell wrote" in the post, > please be sure there's something in it that Lee Bell actually wrote. 8^) I just left it as an indication that I was replying to your post... Can't really claim that I didn't trim... <grin> |
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