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Old July 12th, 2008, 03:37 AM   #1 (permalink)
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50 pound CO2 tank

We fill our own CO2 tanks at home, I have the special scale and refill station, we rent the tank from our local welding supply business, 5 year contract for about $125.00 and it costs about $31.00to get the tank exchanged, we use the siphon tube tanks.
Did a lot of reading on how to fill these tanks safely. The question I wanted to ask is how much CO2 can you get out of a 50 Lb tank, the guys at the welding shop that sell us the tanks refills claim 40 to 45 lbs, that is hogwash, theres no way to get that much out, unless were doing something wrong.

I chill the tanks, 9oz, 14 oz, 20 oz etc. in the freezer for at least 3 hours before filling, I use a digital scale that is accurate to 1/10th of an ounce, when the tank is new it fills like a charm of course, but after I get down to about 25 to 30 lbs of CO2 used it no longer will fill the tanks more then just a few ounces, example a 20 oz. will only go as high as 8 ozs max.

And after endless reading about it on the net I still haven't a straight answer, some say 30, 40 or 50 lbs you can get out of the tank, even the guys at the welding shop can't agree, they are going by the CO2 dispensers that are used for pop machines, open ended tanks that are not pressurizing another tank to fill it, there is an issue of pressure to deal with and when the big tank gets too low it no longer has the pressure needed to fill the tanks to capacity anymore, once the two tanks equalize the transfer ends no matter how much you chill it.

That is my finding, because after 5 tank rentals I can only get on average 30.5 pounds of CO2 out of the tank before it gets to the point where I can only put 8 ozs in a 20 oz tank or 3 ozs in a 9 oz tank, I have tried both cooling techniques, putting in a couple of ounces before filling, blowing it out to chill the tank and leaving it in the freezer for about 3 hours, I have better luck from the freezer at filling and I don't waste the 2 to 3 ozs to chill the tank.

So to cut this long post short, what I'm asking is has anyone out there found this to be true, do you get the same results, I know my rental tanks are full when we get them, the tare weight on the tanks are usually 104 to 109 lbs empty, and when I weight them it shows 50 to 52 pounds heavier then that, so I'm losing about 25 pounds everytime I return a tank, and I weight it and that is about what it weighs over the tare weight before I turn it in.

I know I could get more out of it as long as I'm willing to put up with a 20 oz tank only having 8 ozs in it, I could fill alot more tanks that way, but when your running Tippmann 98 customs with response triggers and cyclone feeders at full auto it don't take long going thru a tank in a woodsball battle

So any help or links to explaning this would help, as of yet no solid answer, I know there is alot of variables when it comes to CO2 but 25 lbs is quite alot of variables, it has to be a pressure issue, I mean if you have a air tank that has 20 psi in it and you go to fill a tire that needs 30 psi to be full, your not going to go beyond 20psi. Oh and for the record I only fill our tanks to 2ozs below the rated capacity for safety and to cut down on the chance of getting liquid CO2 in the markers, it still happens but not as bad, next investment, expansion chambers

Thanks for your help.
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Old July 12th, 2008, 04:02 AM   #2 (permalink)
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I know they make pumps to pump the liquid co2 out of the big tanks into the little tanks, but i think they're sort of expensive. ....then again i've never actualyl filled a tank myself.

Here's another idea. your siphon tube may either not be long enough or have a leak inside your big tank. That would account for the "partial" fills that you can get multiple times. It's actually pulling the gas from the big tank instead of the co2.

The coke guys use the gas anyhow so they won't see a difference. They don't use liquid co2 to carbonate soft drinks so they have no need to pull co2 out in liquid form. that's why they're not seeing a problem
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Old July 12th, 2008, 04:19 AM   #3 (permalink)
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I know they make pumps to pump the liquid co2 out of the big tanks into the little tanks, but i think they're sort of expensive. ....then again i've never actualyl filled a tank myself.

Here's another idea. your siphon tube may either not be long enough or have a leak inside your big tank. That would account for the "partial" fills that you can get multiple times. It's actually pulling the gas from the big tank instead of the co2.

The coke guys use the gas anyhow so they won't see a difference. They don't use liquid co2 to carbonate soft drinks so they have no need to pull co2 out in liquid form. that's why they're not seeing a problem
WOW Thanks for the quick reply, pertaining to the leak inside my big tank, that could be a possibilty if it was the same tank I was using, but when I run out of CO2 I get a new tank, they take the old empty one and give me a new full one, they don't fill my tank for me there, it's just an exchange service, so they would all have to have leaky tubes or too short of tubes.

I agree on the coke guys not seeing a problem, none of them at the welding shop are paintballers, but they sure are interested in starting after I talk with them awhile
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Old July 12th, 2008, 01:11 PM   #4 (permalink)
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I am trying to remember, but when I first got my CO2 tank(50lbs also) we either had a syphon or a non syphon tank, and it did the same thing. So I will look into it, you may need a tank without the syphon tube.

But, you can also try turning the tank on its side. This will help the liquid CO2 go down.


About how many 20oz tanks are you filling with one tank?
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Old July 12th, 2008, 03:23 PM   #5 (permalink)
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I am trying to remember, but when I first got my CO2 tank(50lbs also) we either had a syphon or a non syphon tank, and it did the same thing. So I will look into it, you may need a tank without the syphon tube.

But, you can also try turning the tank on its side. This will help the liquid CO2 go down.


About how many 20oz tanks are you filling with one tank?
Hi,you must use a tank with a siphon tube, that is what I use, it's a pressure issue with the tanks, as for how many tanks I get filled with one, I fill all different types and sizes, but I keep exact count on all the ozs I put in and I don't waste CO2 charging the tanks and then flushing them to get them cold first, I pre-chill them in my freezer for 2 to 3 hours, they get colder then the 2 to 3 oz blast the fill shops give them, so no CO2 is wasted, now getting back to how many tanks I can fill, I will give the ozs I get out of the tanks.

1st tank: 488 ozs
2nd tank: 486 ozs
3rd tank: 395 ozs
4th tank: 490 ozs

Now I can get more out of the 50lb tanks then what is listed but as I said before I don't want to play with a 20 oz tank with only 8 ozs in it.

I am going to try an experiment and have the bottles in a small ice cooler as I fill them, I will tare out the whole set-up on my scale and then fill as normal, cause I know if you keep the temp low it fills better, even though my tanks are pre chilled and real cold, frosted so to speak when I fill them

Thanks for your time, I won't invert the tank to fill them, you get all the crud from the bottom of the tank in your tanks and guns, and beside unless I get a tank without a siphon tube then inverting them would only allow gas to enter,not liquid, I'd have to get one with no siphon tube and I would not want a 150+ pound tank inverted with the possibility of busting the valve off and sending a 150 pound rocket thru my house Safety first.

You need a certain amount of pressure to be able to force the CO2 out of the big tank, up the siphon tube and into your tank, works great when filled, no troubles, even on a warm tank, but when you start getting down below 20 to 25 pounds used then the pressure in the big tank is not enough to push the liquid properly into the smaller tanks, once the smaller tanks equalize with the pressure in the big tank nothing will transfer, even if you counld invert the big tank, you need a difference in potential to make the liguid transfer possible between tanks, if they equalize then it's done, it's over.

My main question was: did anyone on here run into the same thing as me, maybe it's normal for this to happen around 25 to 30 lbs of Co2 usage in these tanks, that is what I'm trying to find out, the welding shop guys claim I should be able to get at least 40 pounds out, no way, they are going on the assumption that it is open ended, like a pop dispenser, sure then you'd empty the tank totally, but when you are pressurizing another tank with a tank then it stands a reason to transfer liquid from one to another or a gas you need to have one with more pressure then the other otherwise no transfer takes place. And when the tank gets down to 20 pounds or so left in a 50lb tank the pressure might be low enough so as not to allow a proper total fill of a 20 oz or any oz tank, this is what I'm trying to fin out.

Just like when you get low on CO2 in your marker, the paintballs don't go as far, the pressure drops off enough that my response trigger resumes single shot fire and sometimes the cyclone feeder won't cock, I have to do it manually, but that is normal on the stock Tippmann cyclone feeder, it does that at around 450 to 350 psi, they have kits that modify the cyclone feeder and have proven that they allow it to operate down as low as 150 psi or so, but thats another subject, don't want to sidetrack here, just providing an example of what happens when pressure drops off in CO2

Anyhow thanks for your reply, but looking for links to my questions or from someone actively filling thier own tanks with 50lb units, wondering what they get out of them, I know they have CO2 fill units that are pressurized filling staions to get the CO2 in better but they are too costly for a basic home operation like ours, even as I lose the 20 to 25 lbs, it's still cheaper to do it this way, but I'd still like to know if I'm doing something wrong or if there is a trick that would help me get more out of each tank.
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Old July 12th, 2008, 03:31 PM   #6 (permalink)
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there should be no reason to chill the tanks before filling them as far as I can see. A temperature difference may helpa bit thouhg.

I still think youre' either got a siphon tube that's too short or you need a co2 pump.
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Old July 12th, 2008, 03:48 PM   #7 (permalink)
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there should be no reason to chill the tanks before filling them as far as I can see. A temperature difference may helpa bit thouhg.

I still think youre' either got a siphon tube that's too short or you need a co2 pump.
I wouldn't doubt about the siphon tube being too short, but I get a new tank each time I go to exchange one, could they all be too short? I guess they could seeing as I'm getting them all from the same company, and I would love a CO2 pump setup but too much money for meBut the guys that rent me the tank say the tube is about 4 to 6" off the bottom of the tank, but then again they are the same guys who think I can get 50lbs of CO2 out of them.

And I do agree on not really having to chill the tanks, but when I fill a warm tank, it will fill it but not as easy, when it comes out chilled, the CO2 goes in fast, real fast, and when the tank gets low and it's at room temp, forget about filling it with a low bulk tank, but you put that same tank in the freezer for a couple of hours and WHAM it takes in about 8 ozs. I figured I'd throw WHAM in there for an effect
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Old July 12th, 2008, 03:58 PM   #8 (permalink)
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Well I have been filling them for about 4 or 5 years, so I know a little bit about it.

We get at least twice the amount of fills you do. We usually get around 35-40 20oz fills before we exchange our tanks. And they are all good fills. According your your numbers you get about 25.

Our first tank didn't have the siphon in it, so we only got around 20 fills out of it, which is why I thought you had the wrong type of tank. So all I can tell you is continue to chill the tanks. As for the inverting part, don't say it will not work if you don't try it.

Also, remember not to get the tanks too cold. You can freeze up the pins and waste a whole small tank.


Martix, the reason for chilling the tanks is when you fill a hot tank, the first burst of liquid CO2 you put in the tank expands, and results in less liquid in the tank. So Goldplanner, if you don't have time to chill them with a fridge/freezer, make sure you tell the people using them not to completely empty their tanks. That way when you let the air out before refilling it, that chills it also.


Question, how do you transport the tanks? And what temperatures are they kept in?
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Old July 12th, 2008, 04:16 PM   #9 (permalink)
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Well I have been filling them for about 4 or 5 years, so I know a little bit about it.

We get at least twice the amount of fills you do. We usually get around 35-40 20oz fills before we exchange our tanks. And they are all good fills. According your your numbers you get about 25.

Our first tank didn't have the siphon in it, so we only got around 20 fills out of it, which is why I thought you had the wrong type of tank. So all I can tell you is continue to chill the tanks. As for the inverting part, don't say it will not work if you don't try it.

Also, remember not to get the tanks too cold. You can freeze up the pins and waste a whole small tank.


Martix, the reason for chilling the tanks is when you fill a hot tank, the first burst of liquid CO2 you put in the tank expands, and results in less liquid in the tank. So Goldplanner, if you don't have time to chill them with a fridge/freezer, make sure you tell the people using them not to completely empty their tanks. That way when you let the air out before refilling it, that chills it also.


Question, how do you transport the tanks? And what temperatures are they kept in?
Don't get me wrong I believe they will work if you invert the tank, but the crud at the bottom of the used tanks will get you into trouble someday, and I would love to get the fills out of it that you do.

My bulk tank is stored at room temp., I'm in wisconsin so you know it gets hot and muggy, and we don't have AC so keeping the bulk tank cool is not an option if that is neccesary? I transport them on their side, and store them upright.

And don't take my posts as hostile to your posts, no hostility meant, nor any questioning of your post meant, but what makes your setup do that many refills and mine not, if you list in detail what you do maybe I can compare. Remember I'm assuming I'm doing something wrong or missing something here, so if you have 5 years of filling experience you should be able to solve my troubles, it would be a dream come true to get that many refills out of the bulk tank.

Do you weigh your tanks when they are empty,or shall I say when you return them to see how many pounds over the tar weight they are at? you say you get about 40 20oz fills out of your tank, do you fill your 20oz tanks to 20 oz or what?? Cause if you do that means you get about 800ozs out of your 50lb tank, assuming 16ozs to a pound comes too: 50 pounds exactly, I don't know how you can get the whole 50 lbs out of a tank, the law of difference of potential would be? I personally don't think you can get 50lbs out totally, if that was possible then you could fill a car tire to 30 psi with a 10psi tank. If you do get 50lbs out please let me know how, I want to get that too it would be great and my cost per oz of CO2 would even be cheaper
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Old July 12th, 2008, 05:58 PM   #10 (permalink)
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Keeping the tank cool is important to keep the CO2 a liquid... Which fills the tanks better.

Not trying to cover myself, but the numbers 35-40 20ozs was a lie, I apologize, there were some 12's and 16's in there also. Of course, we did this the first few times, we kept a chart. Listing what tanks we filled, how many times. I will try to find that for you and see how it compares. But I remember we filled 35-40 tanks.


I must confess, since then, we do not keep track of fills, or even weigh the tanks we fill. We just fill them up as much as possible. Repeat, until the tank gets low. We can usually get three days off of it. About 12-14 fills per day. Then it starts getting low.

I must confess, it has been a few months since using it, so let me think about it and I will try to think of other things that keep you from getting so few fills. But, the tank being warm will definitely make you get less fills. I would actually say that is the main reason for so few...
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Old July 12th, 2008, 07:23 PM   #11 (permalink)
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Keeping the tank cool is important to keep the CO2 a liquid... Which fills the tanks better.

Not trying to cover myself, but the numbers 35-40 20ozs was a lie, I apologize, there were some 12's and 16's in there also. Of course, we did this the first few times, we kept a chart. Listing what tanks we filled, how many times. I will try to find that for you and see how it compares. But I remember we filled 35-40 tanks.


I must confess, since then, we do not keep track of fills, or even weigh the tanks we fill. We just fill them up as much as possible. Repeat, until the tank gets low. We can usually get three days off of it. About 12-14 fills per day. Then it starts getting low.

I must confess, it has been a few months since using it, so let me think about it and I will try to think of other things that keep you from getting so few fills. But, the tank being warm will definitely make you get less fills. I would actually say that is the main reason for so few...
As for us, the only reason we keep track is because we want to see what we are spending per exchange of tank.

Here is how we fill the tanks:

we have a dual valve refilling station, and a bench scale not a fish scale that is accurate to 1/10th of an ounce, so it is very accurate.

1. Tank is pre-chilled in freezer, usually 2 to 3 hours, no problem seeing as we have (10) 20 oz tanks, (8) 9 oz tanks on hand and never run out of full tanks

2. Hook tank up to fill valve, main bulk tank valve is off, so is bleed valve and fill valve, after tank is hooked up we bleed off any CO2 remaining in the tank by turning the pin valve depresser knob down and then opening the bleed valve until tank is completely empty, that flushes the tank and further chills it.

3. Then we close the bleed valve, scale is on and we put tank on scale, wait till it is stable then zero the scale to show all zeros, we tare it.

4. Then we open the main valve on the bulk tank, the fill valve is still closed at this point, now the bulk tank valve is wide open, scale is zeroed, and tank is ready to be filled.

5. Now we slowly open the fill valve and watch the scale, it will fill fast when it's that cold, I mean 18 ozs in just a few seconds or so, the scale will climb to whatever you allow it to, we stop at 18ozs, then close the fill valve, we don't close the main valve on the bulk tank at this time if were gonna fill more tanks.

6. Now after the fill valve is closed we have to bleed the line going to the filled tank so we turn the pin valve knob clockwise until it stops then give the CO2 tank a 3/4 turn counterclockwise to be sure the pin valve is closed, then we open the bleed valve lever and the CO2 in the line to the tank is released at which time you can remove your CO2 tank without damaging the o-ring.

7. this whole process from start to finish takes no longer then about 2 minutes max.

We use the dual valve fill station, there are single valve ones out there but the dual works nicer for us, that way you don't have to open and close the knob on the main tank as your filling. And we keep track of the size of the tank filled and exactly how many ozs went into it, the only waste would be in the line to the tank as you depressurize it before removing the tank and that is minimal.

We do this everytime we fill the tanks, the bulk tank must be warmer then the fill tank for the proper liquid transfer can take place, so they say, and that seems to be the fact as I find it by doing it that way.

And come to find out, my welding supply outfit only supplies medical grade CO2 so the trash in the tanks would not be the same issue as commercial grade CO2 that has impurities in it, that is what I was told by them, but remember these are the same guys that said I can get 50 lbs out of a 50lb tank.

My logic may be wrong here but if you look at the two tanks, one has 2 lbs left in it, the other is empty, you hook them up, now naturally the higher pressure from the other tank would go into the tank with no pressure, up to a point that is, as soon as the low pressure tank reached 1 pound of pressure both tanks would equalize and nothing would transfer, so how can one expect to fill a 20oz tank to capacity if there is not enough pressure in the bulk tank to push that in? As soon as the small tank reaches the pressure of the big tank they would equalize and nothing would move, granted probably if you rechilled the tank you might get a bit more in the small tank but not much, I have tried that

I hope this can be figured out so that others may read this post if they too are going to fill thier own tanks and run into the same troubles. Thanks for your time toXic I appreciate it

Oh and I should add, when we fill the tanks to 18ozs we get about 1000 to 1300 shots from the tank, and since I have added the response trigger and cyclone feeder to my Tippmann98 I see no difference in CO2 usage like some people claim, cause as Tippmann says on their site the blowby gases that are nromally wasted in the marker are what is used to run the response and cyclone feeder systems.

And that is how we do it, if someone sees something wrong in that let me know please, I have only been refilling for 2 seasons now, and we usually only play woodsball 3 months out of the year here, the bugs get so bad sometimes that you are almost tempted to start firing on them Deerflies, Knats, Horseflies, Mosquitos, you name it we have it here is Wisconsin!!
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Old July 12th, 2008, 07:32 PM   #12 (permalink)
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.

I must confess, since then, we do not keep track of fills, or even weigh the tanks we fill. We just fill them up as much as possible.
I just re-read your post and seen this part of it and I cringed when I read it, How can you make sure you don't overfill and blow a burst valve? Or even be sure your getting the proper fill by doin this.
You must weigh them to do it safetly, and to keep track of how many ozs you used, maybe your only getting what I'm getting to out of the tank, how will you know unless you are weighing them and keeping track of the ozs used, like I said I average 480 ozs out of a 50lb tank, I could get more but they would not be full fills as said before, so that average is only because I refuse to keep "milking" the tank to get what is left and have a whole bunch of half empty tanks around. And of course that total amount don't include the wasted CO2 that is lost in the bleeding of the tank line before disconnecting it, that would be less then 1/2 an ounce I'm sure per tank.
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Old July 13th, 2008, 02:44 PM   #13 (permalink)
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I typed that out twice, the first time I made sure to put in a warning not to do it. Do as I say not as I do type of thing...


But I must apologize about most of my posting yesterday, I have a tendency to enjoy posting when I have hardly no sleep. I woke up friday at around 9am and didn't sleep until last night around 11pm. So I wasn't thinking with a clear head. So here is better help.

Here are the actual numbers we had after getting the correct, siphon tank.

13 9oz's = 117 ozs
3 12oz = 36 ozs
9 16oz = 144 ozs
17 20oz = 340 ozs

Which totals up to 637 oz's these were decent fills(it was when we were weighing them). Your average is around 465, so thats a decent bit more. about 9 more 20oz tanks.

I looked over your steps for filling the tanks, and you use the same system we do, and do it exactly as us. My only thought of why you are getting less fills is the tank being kept in a warmer temperature. I am no expert in air, and things like that, but from my thinking, you can have a full tank a little warm. Such as first getting the tank. Because it is full, the CO2 has less space to expand to, so it stays(most) stays liquid. But after using it, if it is warm, every time you fill a tank, you lose the liquid CO2 in the tank and it expands in the tank. Like I said, I am no expert on it, but that seems plausible to myself. Which is why we keep my tank in my basement at all times. It never gets over 75*.

Other than that, I am unsure, unless it could be something with the Medical grade CO2. Ours is the nasty comercial stuff. I hope that helps though...
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Old July 13th, 2008, 03:39 PM   #14 (permalink)
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Thanks toXic for posting your fill totals and taking the time to do that It could be that it's because we store the tank in a warm area, and as it gets lower on CO2 more gas may form to replace the liquid part of it thus giving us less refills.

That seems to make sense, I have no way of chilling the tank, it would be nice if I could just put it in the refrigerator for a short time, not too long just a short time, but my wife would kill me if she seen that, and besides my refrigerator is not big enough

I will try that getting the big tank a bit cooler somehow, cause when I come to think of it I seem to get more out of a bulk tank when were fillig tanks at the cooler part of the year, so that could be it, I'm hoping

Once again thanks for your time, I appreciate it.
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Old July 13th, 2008, 06:29 PM   #15 (permalink)
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No problem. Sorry for the rambling yesterday though.

I guess just try to keep it as cool as you can. If its outside always keep it in the shade Your not getting that much less than us. Question though, you said you have a 5 year contract, do you have to pay $125 every year? or just once? Our tank is through Airgas, but we have a friend that hooked us up with a tank. Our price is $75 a year and $15 per fill. But due to high gas prices and such, we just received a letter it may increase a little bit.
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Old July 13th, 2008, 10:54 PM   #16 (permalink)
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No problem. Sorry for the rambling yesterday though.

I guess just try to keep it as cool as you can. If its outside always keep it in the shade Your not getting that much less than us. Question though, you said you have a 5 year contract, do you have to pay $125 every year? or just once? Our tank is through Airgas, but we have a friend that hooked us up with a tank. Our price is $75 a year and $15 per fill. But due to high gas prices and such, we just received a letter it may increase a little bit.
Yea it's $125.00 for 5 years total, not per year, and it costs $31.00 to fill the tank or shall I say exchange it for a full one, you can rent it per year, I forgot the costs but it turns out to be alot cheaper to rent it for 5 years.

We get ours from Praxair, we don't get drop off service, we have to pick up the tank ourselfs, we live up in the woods so it is a roundtrip of 65 miles to get it, but it's no problem because we usually plan a trip to do other things that day when we go to get an exchange.

I would never go back to having someone else fill our tanks, it's nice knowing that your able to fill your own if you run out, especially when we live so far from filling stations that do it.
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Old July 14th, 2008, 12:38 PM   #17 (permalink)
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Dang that's a pretty good price. I would look into trying that, but I am slowly converting everyone around here to use HPA. Since I get it filled for free.
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Old July 15th, 2008, 02:21 AM   #18 (permalink)
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after reading sevaral posts on filling and this complete conversation tanks work on the theory of basic gravity Hydraulics

just to throw this out there take it as you will

You will never exceed 800oz out of a 50# tank (or 40 20oz fills 16oz per pound) and because as co2 gets warmer it turns in to a gas as more liquid is pulled from the tank there is more room for gas to form.

as you have previously stated the anti-siphon tube sits 4"-6" from the bottom of the tank as i don't have the time to get the statistics of a 50# tank ie height of tank, liquid fill height, in side diameter of tank actually volume/weight of co2@ x pressure i will not quote any amount of statistics just facts that i know from previous research and things i learned in school.

First thing you guys need to forget and ill probably repeat it several times
You are removing gas/liquid for one tank to the other by volume not weight.

If tank a (50#) is half empty there is no possible way to fill tank B (20 OZ) more than half full basic Hydraulics so if you have a half full 50# tank filling a smaller 20 oz tank you will not get more than 10oz in the 20 oz tank.

this is not how ever true if you freeze the smaller tank because as the tank/air in side the tank is cooled the air pressure in side the tank is reduced creating a small amount of negative vacuum pressure sucking more liquid out of the larger tank.

in response to inverting the 50# tank this will not help first of all because you are not actually filling by weight but by volume. weight of the liquid/gas co2 is only used a measurement because it is a lot easier to fill the tank by weight then pressure.

second the tank has an anti-siphon tube in it so if you invert the tank you are moving the liquid to the top of the anti-siphon tube/valve eliminating the reason for anti-siphon tube in the first place.

just to simplify things
the anti-siphon in your 20 oz tank eliminates the liquid co2 from entering the marker creating hot shots.
However the anti-siphon tube in the 50# tank is designed to pull the liquid co2 out of the bottom of the tank and fill the smaller tank with the newly acquired liquid.


now on to the coke company they don't use a anti-siphon tube in there tanks because first the liquid co2 would freeze the pop destroying the dispenser as the water in the pop expands and 2 the co2 is simply to create a fizzle in the pop creating the flavor we all know and love (everyone hates flat pop and beer.

if you disagree with anything let me know as i am add sorry for jumping around so much...


here is a simple description of what is going on in side your 50# tank
except
replace the piston with gravity

The transmission of forces from point to point through a fluid to the transfer of liquid from a point of higher concentration to one of lower concentration
HowStuffWorks "How Hydraulic Cranes Work"

i hope this helps SORRY IT IS SO LONG

Last edited by jgilk1 : July 15th, 2008 at 02:50 AM.
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Old May 15th, 2009, 11:58 PM   #19 (permalink)
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Wink Inverting my Refill station

Ok, so Ive been trying to find out how to properly fill my co2 tanks and i noticed this site. lots of good info. But i noticed you all were using siphon tanks and i just wanted to mention that i have a welder at my shop and it has a non siphon tank. so i finnally realized that was a problem for my refilling for paint ball. So instead of getting a new tank, I welded a holder that goes into my reciever on my truck. so once im on the field i just drop it in and my tank is inverted ,( if you can imagine a heavy tank floating over the ground) It scary! but it works amazing!
Now Im gonna try to see how many refills i can get with an inverted tank and If ya'll are interested Ill post it up and let ya know!
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Old May 16th, 2009, 12:06 PM   #20 (permalink)
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haywardrobin,

Are you going to use a scale to measure the Oz's you put into the tanks? I usually put about 18 to 19 Oz's in the 20oz tanks and about 8 Oz's in a 9 oz tank.
A good accurate scale helps And the only bad thing about inverting a big tank is of course like you say dangerous but also all the scale and rust and grime that is on the bottom of the tank will now be forced out of the inverted tank into your cylinders and ultimately into your paintball marker.

And for all you out there that fill your tanks yourselves and for all of you that are planning too a HEADS UP from my Co2 supplier, if AL Gore's, the ozone mans plans come to pass we will no longer be able to fill our own tanks due to the Co2 being bad, which it is not, it's the big lie being told to us all about it, 30,000+ scientists are suing or going to sue Al Gore for not allowing their side to be heard on the subject, theres no global warming like they say, the warming is normal and we need more C02 not less, so I say lets play more paintball

Anyhow not wanting to get political here, please let us know how many fills you get, I'm interested as always
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