Leaky 20 lbs co2 tank ? - The Planted Tank Forum
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post #1 of 18 (permalink) Old 06-21-2007, 03:12 PM Thread Starter
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Leaky 20 lbs co2 tank ?

ok so my co2 has been running on my 75 gallon almost 24/7 since i bought it . THe pressure was orriginaly 800 and now it is 100 ? so thats like an entire 20 pound co2 tank gone in 4 months ? Secondly it took until about a week agao to get to about 400 psi so i thought ok it will last about 4 months ( since 800-400 took 4 months as well. after one week the pressure has gone from 400- 100 so I think there must be a leak and im leaving to go to my cottage for the summer so it will deffinatly run out before i get back. Further more it took like 3 months to get from 800 to 600 so i think the leak must have slowly gotten bigger. if anyone can help me that would be great... its a rental tank and its an aquariumplants.com best regulator. Thanks


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post #2 of 18 (permalink) Old 06-21-2007, 03:39 PM
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No, I don't think it has gotten bigger. You probably DO have a leak though, since I'd imagine a 20# tank would last much longer than only 4 months.

My tank took a year to go from 900 to about 300-400, and then only a week or two to drop very quickly. It has to do with the dynamics of using up all the liquid CO2 and then having only gaseous CO2 left in the tank.

I'd go refill that tank ASAP since you're probably close to an end-of-tank dump which could kill your fish/livestock.
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post #3 of 18 (permalink) Old 06-21-2007, 05:41 PM
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epic is right. As long as there is still liquid in the CO2 tank the pressure will be constant. Once the level gets low enough the liquid will have turned all into gas and as you use it up the pressure will start to drop. You probably do have a leak though somewhere in your lines as I have a 10lb tank on a 120gal tank and it lasts more then 4 months.

Try taking some soapy water and slathering it over the connections. It will start bubbling where the leak is.
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post #4 of 18 (permalink) Old 06-21-2007, 08:24 PM
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I have to replace my 5# can about once a month...so this doesn't seem wrong to me...but then again it all depends on how much CO2 is being used all the time. I guess in 4 months I go through 20#'s of CO2...but that's in 5# incriments....?????

I would check for leaks...or have the rental place check for leaks.

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post #5 of 18 (permalink) Old 06-21-2007, 09:52 PM Thread Starter
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yeah im taking it back to them hopefully ill get a discount on the new tank if it has a leak. ITs too bad there open monday to friday 7-5 though not the greatest hours.


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post #6 of 18 (permalink) Old 06-21-2007, 09:57 PM
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For a situation like this, would a soap-water leak check work? Or would the tank be leaking too slowly for this method to be effective?


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post #7 of 18 (permalink) Old 06-21-2007, 10:41 PM
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For a situation like this, would a soap-water leak check work? Or would the tank be leaking too slowly for this method to be effective?
Yes it will work. I've done it with a 2L Pepsi bottle, so I see no reason why it shouldn't work on a metal canister.

Is Windex the other thing people like to use to check for leaks? I know it is a cleaning product but don't remember exactly which one.

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post #8 of 18 (permalink) Old 06-21-2007, 11:03 PM
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My 20 lb tank lasted 4 months. Just refilled it. It's for my 125 gallon. I am injecting via 2 diffusers. I think all the responses so far have been guess work. Only you know how much you are using. For instance, in my 20 gallon tank, I have a 10 lb that lasted 8 months, but my bubble rate is < 1 bps. In my 125 gallon I am using > 5 bps (>2 bps at each point), so obviously I am going to use a lot more gas. Do you know what your bubble rate is? If it's 1 bps and you use it up in 4 months, yeah, I'd say you have a leak. but if you are doing > 4 bps, then no, I don't think so.

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post #9 of 18 (permalink) Old 06-22-2007, 03:16 AM Thread Starter
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im doing about 5-8 bps about 15 hours a day so i could see it running out quickly but still this seemed a little too fast. My KH is like 3-5 constantly hell ive had my kh ( before co2 ) at 22 :O now with the discus i have to be a little more carefull. Anyways its down to 50 now and i cant get it filled till like thursday... I lowered to like 4 bps and im turning down my photoperiod hopefully it wont get too mucky!


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post #10 of 18 (permalink) Old 06-22-2007, 03:58 AM
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i was wondering how many people weigh their tanks before and after getting a refill just to make sure you are getting a proper fill?
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post #11 of 18 (permalink) Old 06-22-2007, 07:06 AM
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I weigh mine. I get them from the local welding supply place here. I just trade my empty tank in for a filled one. I subtract the tare weight from the total weight to see how full it is. So far, I haven't been cheated.

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post #12 of 18 (permalink) Old 06-22-2007, 02:56 PM Thread Starter
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Just to tell you guys KH straight from the tank reads 8 DGH so im suprised the co2 is fluxuating so much. i know overnight is a better reading but Well i havent had time to do that. any thoughts ?


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post #13 of 18 (permalink) Old 06-22-2007, 04:21 PM
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Quote:
Originally Posted by D.gilly View Post
...KH straight from the tank reads 8 DGH...
Hi D

I believe that you mean 8 dKH, right?

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post #14 of 18 (permalink) Old 06-22-2007, 04:43 PM
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i was wondering how many people weigh their tanks before and after getting a refill just to make sure you are getting a proper fill?
That's a good idea. I'm going to have to do it the next time I get a fill, which is soon, for the 10 lb tank in my 20 gallon.

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post #15 of 18 (permalink) Old 06-25-2007, 11:45 PM Thread Starter
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Just wanted to throw out another question the tank reads 0 but the co2 is still pumping away and has been for 2 days is this common ?


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