Go Back   Aquarium Advice - Aquarium Forum Community > General Aquarium Forums > General Hardware/Equipment Discussion
Click Here to Login

Join Aquarium Advice Today
Reply
 
Thread Tools Search this Thread Display Modes
Please support our sponsors and let them know you heard about them on AquariumAdvice.com
 
Old 04-22-2008, 04:43 PM   #1
Aquarium Advice Addict
 
Join Date: Nov 2006
Posts: 2,254
Pressurized CO2 System

Okay, I've decided to look into a pressurized CO2 system. I am pretty sure I can get the pieces cheaper through my work. We do process applications for industrial and commercial companies.

1. CO2 tank.
2. Pressure regulator w/ upstream and downstream gauges.
3. Check Valve
4. Needle Valve
5. Solenoid Valve
6. pH Meter
7. Air tubing

The one piece I don't know if I can get any cheaper is the piece that will disperse the gas into the tank itself. What should I use?

From what I can tell, CO2 comes out of the tank, regulates down, passes through the solenoid when it's on (based on receiving power and not meeting pH in the tank), and then it's dispersed into the tank. What is the needle valve used for?

Thanks in advance for any help. If I get these parts cheaper, I'll see if I can help out people on these forums too with their own setups.
__________________

__________________

theotheragentm is offline   Reply With Quote
Old 04-22-2008, 05:17 PM   #2
Sliced Bread
 
neilanh's Avatar


 
Join Date: Dec 2006
Location: Northern Virginia
Posts: 8,482
The needle valve gives you finer control of the flow rate of the CO2 gas. Think of it as another low-side regulator, essentially. The addition of a bubble counter on the output of the needle valve is a way to guage how much flow you're getting.

As for diffusion, there's a ton of different methods that can be deployed. Usually, a tanks filtration method will help to dictate the best means for diffusion of the gas into the water column. One can go with an inline reactor if using a canister filter or a closed loop system, or a micro- diffusing airstone or "glass diffuser" can also be used. Others use a venturi system to blow the bubbles around the tank.
__________________

__________________
~Neilan
In the DC Metro Area? Check out GWAPA and WAMAS
neilanh is offline   Reply With Quote
Old 04-22-2008, 05:57 PM   #3
Aquarium Advice Addict
 
Join Date: Nov 2006
Posts: 2,254
I have a cannister. How do you diffuse it into the system when you have a cannister?

Where are you placing the needle valve in relation to the other pieces of equipment? What pressure are you looking for with the CO2 when you're dispersing it?
__________________

theotheragentm is offline   Reply With Quote
Old 04-22-2008, 06:44 PM   #4
Sliced Bread
 
neilanh's Avatar


 
Join Date: Dec 2006
Location: Northern Virginia
Posts: 8,482
Check out this link by Sparky on how to build an inline reactor

This picture shows the setup really well


The needle valve is the brass knob on the right directly connected to the bubble counter.

On my system, I run the regulator at a low side pressure of 30psi, then use the needle valve to adjust to the desired flow rate (measured in bubbles per second, or bps). Depending on tank size, method of diffusion, amount of surface turbulence, etc, will determine your bubble rate.
__________________
~Neilan
In the DC Metro Area? Check out GWAPA and WAMAS
neilanh is offline   Reply With Quote
Old 04-22-2008, 07:03 PM   #5
Algae Fighter
 
JustOneMore20's Avatar


 
Join Date: May 2006
Location: Birmingham, AL
Posts: 3,872
Send a message via MSN to JustOneMore20
If its a larger tank (I think you have a 55g, right?) then I suggest using an inline reactor or a powerhead. The inline external reactor would get it out of the tank, so might be worth looking into.

Also, you don't have to get a pH monitor/meter unless you just want to......its a luxury item and not a necessity.
__________________
~Kristin~
2 planted tanks: 40g, 20g ; 38g Reef tank
My links to pics: 40g breeder planted build, 40g breeder planted update, My 38g Reef Build

JustOneMore20 is offline   Reply With Quote
Old 04-22-2008, 08:12 PM   #6
Aquarium Advice Freak
 
warped1's Avatar
 
Join Date: Mar 2008
Location: South Philly, Pa.
Posts: 364
You guys don't mess around - I'm talking big leagues here
I never new so much could be involved with a tank
I'll be happy just to get my 36gal running with fake plants and drift wood - I could only hope that I - one day - have this kind of dedication and knowledge
__________________
warped1 is offline   Reply With Quote
Old 04-22-2008, 08:16 PM   #7
Sliced Bread
 
neilanh's Avatar


 
Join Date: Dec 2006
Location: Northern Virginia
Posts: 8,482
It seems like a lot, doesn't it warped? It's not that bad really.
__________________
~Neilan
In the DC Metro Area? Check out GWAPA and WAMAS
neilanh is offline   Reply With Quote
Old 04-23-2008, 12:47 AM   #8
Aquarium Advice Addict
 
Join Date: Nov 2006
Posts: 2,254
Let's see if I got this right. With that image you have there, the tank would be hooked up on the left side of the PRV. Then you're traveling through the solenoid and then upward into the bubble counter. Is that right?

What do these external reactors look like?

As far as the pH meter goes, I am pretty sure I can get my hands on them pretty cheaply, and it does add a bit of control.
__________________

theotheragentm is offline   Reply With Quote
Old 04-23-2008, 12:52 AM   #9
Sliced Bread
 
neilanh's Avatar


 
Join Date: Dec 2006
Location: Northern Virginia
Posts: 8,482
That's correct. The left guage is the high side, or tank pressure. Right guage is the low side controlled pressure. Through the solenoid (part with the cord), then through the needle valve and into the bubble counter.

In the link above, here's a shot from that DIY guide, showing what an external inline reactor can look like.


Nothing wrong with running a pH controller at all, it adds a bit of safety and takes away a lot of the need for tuning/tweaking the system, but adds the complexity of needing to maintain the probe and calibrations of the controller. Not a big deal on either route, just different techniques.
__________________
~Neilan
In the DC Metro Area? Check out GWAPA and WAMAS
neilanh is offline   Reply With Quote
Old 04-23-2008, 01:34 AM   #10
Aquarium Advice Addict
 
Join Date: Nov 2006
Posts: 2,254
How does the bubble counter work exactly? I assume it's filled with water, otherwise it would be impossible to count bubbles. I calculate the bubbles needed per second, and I just throttle down the needle valve until I reach that point? What constitutes a bubble? Is there a size?



This is the Drs. Foster & Smith ultimate setup, according to them. It looks so horribly cluttered, but let me see if I get this right. CO2 out of the bottle, through the regulator, past the solenoid when it's energized, through a needle valve, into a bubble counter, into a reactor (for dissolving into water), and into the tank. The pH meter feeds back to the controller, which tells when the CO2 level is saturated and cuts signal to the solenoid.

Instead of the reactor, could I just use something like this? Would this give me a fine enough mist of bubbles that I could place it under a small powerhead and have the powerhead further disperse it into the water?
__________________

__________________

theotheragentm is offline   Reply With Quote
Reply

Tags
co2, stem, system

Please support our sponsors and let them know you heard about them on AquariumAdvice.com

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
pressurized co2 system? xgarland77x Freshwater & Brackish - Planted Tanks 3 02-25-2009 06:17 PM
Need some help with my pressurized CO2 system An t-iasg Freshwater & Brackish - Planted Tanks 6 02-28-2008 02:47 PM
Pressurized CO2 system help JustOneMore20 Freshwater & Brackish - Planted Tanks 3 03-22-2007 06:00 PM
How did I do on my new Pressurized CO2 system? CGGorman Freshwater & Brackish - Planted Tanks 4 01-13-2006 10:31 AM
Pitfalls of a pressurized CO2 system? BrianNY Freshwater & Brackish - Planted Tanks 1 11-24-2003 09:30 PM







» Photo Contest Winners








Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -4. The time now is 02:49 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.