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Old 02-03-2004, 01:34 PM   #1
dave_cool
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Hi
I'm getting ready to switch from a DIY to Pressurized system. I've got the regulator/needle valve/solenoid/bubble counter on order from Aquatic Store.com.......and called about a tank at the local welding supply. What is the normal tank pressure on a pressurized system? I just assumed it would be aroung 1200-1500 psi but the sales person told me that it is a 600 psi tank. Is this what any of you are using?

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Old 02-03-2004, 04:36 PM   #2
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I have no idea what my psi is on my 5 lb tank, but as long as you get a CO2 tank, it's gonna be the right one. Keep in mind that you're actually only pushing out something like 10psi of CO2 into the tank. That's why you needed the special CO2 regulator, AND a needle valve.
Good choice on the milwaukee...it's what I have, and it make the change to pressurized very very easy.
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Old 02-03-2004, 06:07 PM   #3
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Most 5 lb CO2 cylinders are usually going to read 700-900 psi when full at room temp (70 F). As long as the cylinder is certified to hold a full 5 lbs of CO2, then it should be able to withstand the pressure.
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Old 02-03-2004, 08:40 PM   #4
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Pressure in my 5lb is 900 psi when at room temperature. I got a bottle refill when it was 5 degrees and the pressure in the cold bottle was was 500 psi.

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Old 02-03-2004, 10:40 PM   #5
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Once the co2 bottle is in your house and at room temperature, the pressues - 800 - 900 lbs or so, depending on the exact pressure, will remain stable while there exists any liquid co2 in the tank. When the pressure starts to drop, it is time for a co2 refill.

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Old 02-04-2004, 03:57 PM   #6
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FYI

On the regulator there will be two gages, one that tells you the pressure in the tank (600 to 900 psi from what everyone has said), and one to tell you the outflow pressure. You need to adjust the outflow pressure to be around 20 psi so you can control the flow of CO2 to your aquarium using your needle valve.
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Old 02-05-2004, 07:16 PM   #7
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Quote:
Originally Posted by SCMurphy
FYI

On the regulator there will be two gages, one that tells you the pressure in the tank (600 to 900 psi from what everyone has said), and one to tell you the outflow pressure. You need to adjust the outflow pressure to be around 20 psi so you can control the flow of CO2 to your aquarium using your needle valve.
Interesting...I was told by Rex to open up the regulator all the way, then use the needle valve to dial it down to the bubble rate I'm after. I'm pretty sure my outflow pressure is 50psi...how 'bad' is this?
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Old 02-05-2004, 09:36 PM   #8
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I'm not sure what you mean by 'bad'.

As far as I know the tank valve should be open all the way but the regulator should step the pressure down (i.e. regulate the pressure) from the 600-900 psi in the tank to (I was told) 20 psi. I don't know if this is set in stone anyplace, but for my swaglock needle valves it makes it easy to adjust the bubble count from 5 per minute on up. I have a regulator that you set a screw(bolt?) and lock the setting with a nut. I also have a shutoff valve between the regulator and the needle valves so I can leave the tank be and still depressurize the system.

If your system functions happily at 50 psi maybe my informant was all wet.
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Old 02-05-2004, 09:47 PM   #9
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If you have full pressure on the needle valve, it will be hard to finetune your bubble rate. I can imagine that the full pressure is harmfull for your needlevalve. You should try to avoid high pressure directly on the NV.
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Old 02-06-2004, 12:23 AM   #10
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The valve on the tank should be open all the way. There should be another adjustment on the regulator, might even just be a bolt or screw that you can use to adjust the LOW side pressure.
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Old 02-06-2004, 01:47 AM   #11
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Thanks..............now I just have to figure out how to break the news to my wife about my new toys............. :?
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