SWG and Spa bubbler, Hydrogen and Air

[red-beard]

I was looking at the aeration threads to raise pH thread and looking at some videos on raise pH using aeration. One suggested using the spa bubblers. I can turn mine on even in pool mode.

But then a horrible thought. I am mixing air into my pool lines while the SWG is making chlorine gas and Hydrogen Gas. I'm not worried about the chlorine, since it has a high solubility. But the hydrogen mixing with air seems like a really bad idea. H2 has a flammability range in Air of 4% to 75%.

Thoughts?

 

[JoyfulNoise]

You’re fine. It’s not as much hydrogen as you think it is. The volume of air being forced into the jets is a lot more than the hydrogen gas. It also requires a detonation source such as a flame or an extremely hot spark … you got any spark plugs hanging around your spa??

 

[red-beard]

I used to work in/on hazardous gas classified areas. When I designed/designated a lot of equipment for coal gasification, I had to switch up to group B hydrogen as opposed to D methane.
Mixing air and hydrogen just seems bad. I'll run the calcs. You're probably right that the hydrogen air ratio is too low to worry about.

 

[JamesW]

If the cell produces 1.45 lbs per day of chlorine gas, then that is 657.7089 grams

Cl₂ is 70.906 g/mol.

So, that’s 9.276 moles Cl₂ and 9.276 moles H₂

H₂ is 2.016 g/mol.

So, you get 18.7 grams per day or 0.78 grams per hour or 0.013 grams per minute of hydrogen gas.

Hydrogen gas releases 34 kcal/gram (142 kJ/gram) (135 btu/gram) upon combustion in air.

So, in 1 minute, you get 0.013 grams of hydrogen gas, which contains 1.75 BTU.

That’s enough energy to heat about 800 milliliters of water by one degree Fahrenheit.

Even if you had a source of ignition, there won't be enough to create a problem.

 

[red-beard]

James, thanks for running the calculations. I feel a lot better about this.