What is leak proof co2 tubing made out of? Is polyethylene tubing co2 leak proof? I would like to get some in town at all possible as Idon't want to order just one item and pay shipping. Thanks for any help.
Try submerging a piece of silicone tubing with CO2 flowing through it in the water. You won't see CO2 bubbles forming on the tubing. People who use silicone tubing don't find that they can't get CO2 up to the tank.
Try submerging a piece of silicone tubing with CO2 flowing through it in the water. You won't see CO2 bubbles forming on the tubing. People who use silicone tubing don't find that they can't get CO2 up to the tank.
Try submerging a piece of silicone tubing with CO2 flowing through it in the water. You won't see CO2 bubbles forming on the tubing. People who use silicone tubing don't find that they can't get CO2 up to the tank.
Tom Barr;30028 said:Still, chicken feed $, but hardly worth discussing further..........you could make more $ sitting here than you'd save![]()
Regards,
Tom Barr
The main issues are distance the CO2 travels, the thickness of the tubing involved, pressure is a huge factor and the temp.
One thing that might affect the answer is the value of the pressure inside the tubing.
Since the tube contains virtually pure CO2, if the loss is proportional to partial pressure difference across the material, that gives about 15 psi differential pressure. But, if the loss is proportional to the total pressure differential across the material, you get very close to zero pressure differential - the pressure should be roughly equal to the depth of the end of the CO2 tube in the tank water, a few inches of water or around 0.1 psi. The calculated loss for the two interpretations is obviously very different. I don't know which is the correct one.
And what types of diffusion per meter does one get at say 25 C and 1 psi?
Silicone tubing- 4’ long, at ~1psi pressure, 4mm inside diameter, 6mm outside diameter, and 3 bubbles/sec. flow rate of CO2 into the aquarium 24 hrs a day.
You would lose about 136cm3 of CO2 in 24hrs. Flowing 3 bubbles a second ~19440cm3 in 24 hrs, so that would be about 0.70% of your CO2 lost through the silicone airline.
So it's more for larger scale, higher pressure applications really
I think this shows clearly that CO2 leakage through the tubing itself can be a real issue at higher pressures (especially with silicone tubing), but under the conditions all of us will be using the tubing (1-2psi max) it is really a non-issue.
For any tubing after a needle valve (which cuts flow and creates a pressure drop) you would use the pressure required to push the bubbles down into the tank water and that's it, which would be 1psi for every 2.3' of depth the CO2 hose goes below the water surface. That pressure being so small is why this is really a non-issue for just about any setup that will be used for planted tanks. Most people only use tubing after the needle valve, so the pressure is always less than 1psi and often only a small fraction of 1psi.
And what types of diffusion per meter does one get at say 25 C and 1 psi?
Probably not much.
So it's more for larger scale, higher pressure applications really
A very likely planted tank type setup using silicone tubing-
Silicone tubing- 4’ long, at ~1psi pressure, 4mm inside diameter, 6mm outside diameter, and 3 bubbles/sec. flow rate of CO2 into the aquarium 24 hrs a day.
You would lose about 136cm3 of CO2 in 24hrs. 3 bubbles a second ~19440cm3 in 24 hrs, so that would be about 0.70% of your CO2 lost through the silicone airline.
I think this shows clearly that CO2 leakage through the tubing itself can be a real issue at higher pressures (especially with silicone tubing), but under the conditions all of us will be using the tubing (1-2psi max) it is really a non-issue.