CO2 Tank

GreenStuff

Prolific Poster
Feb 11, 2005
62
0
6
Canada
Hi,
My CO2 tank guage was in the red this weekend, telling me to order more. So I removed it and took it outside and released what was left, which seemed to be a lot. With the valve fully open it went for almost a minute. (5lb tank)

How long do people tend to let their tanks run in "the red" before they get it re-filled?
 

JadeButterfly

Guru Class Expert
Jan 23, 2005
115
0
16
Re: CO2 Tank

when I notice my valve in the red zone (i only check like once a week)
I try to get it refilled within that week (whenever I'm free)...

I got a 10lb.
 

Ian H

Guru Class Expert
Jan 24, 2005
265
0
16
Shipley, West Yorkshire, UK
Re: CO2 Tank

I've read somewhere that if you run a tank near empty it can dump too much CO2 into the water. I certainly don't know this for a fact as I've only just started using my cylinder.

Ian
 

Tom Wood

Guru Class Expert
Jan 24, 2005
139
0
16
Kerrville/Austin, Texas
Re: CO2 Tank

Ian H said:
I've read somewhere that if you run a tank near empty it can dump too much CO2 into the water. I certainly don't know this for a fact as I've only just started using my cylinder.

Ian

Yeah well, we don't really want to go there again...

If you have a needle valve then it's okay to run the CO2 tank empty. What will happen is that there will be a small rise in the output pressure which will increase the bubble rate slightly. Unless the KH is borderline or you are running the tank at absolute maximum CO2, the increase won't be noticeable.

I have my CO2 line inserted into a submersible pump and can hear a little whoosh each time a bubble hits. Last night I heard no woosh, and sure enough the CO2 tank is empty. I never even noticed it until it was quiet. I've run CO2 tanks empty for years with no ill effect, as long as there is a needle valve to control the outflow.

TW
 

GreenStuff

Prolific Poster
Feb 11, 2005
62
0
6
Canada
Re: CO2 Tank

I took my tank in to be filled today and the guy told me that there would likely be about a 1/5 tank left when the guage indicated "time to refill".
 

GreenStuff

Prolific Poster
Feb 11, 2005
62
0
6
Canada
Re: CO2 Tank

Thanks. That's good to know. Next time my tank goes into the red I won't panic. I do have a needle valve on it so I'll let it run quite a bit longer now.
 

Gill Man

Prolific Poster
Feb 10, 2005
48
0
6
59
San Francisco
Re: CO2 Tank

I let me 20lb go to empty, but then, it was the weekend and I couldn't get a refill until Monday. I have an empty 10lb; I think I'll be refilling this one as well as an emergency backup.
 

AV8TOR

Junior Poster
Jan 23, 2005
30
0
6
69
Ohio
Re: CO2 Tank

A friend of mine works at a welding store where I get mine re-filled and he says that the red zone (re-fill) is indicated because that is where there is no more “liquid” CO2 in the tank. Yes there is pressure but not as concentrated as pure CO2. The pressure fall off is also faster below 400 psi.