fill time

[samdefloreal]

Not sure if that's been asked already but I was wondering if someone could tell me how to calculate the time it woud take to fill a 12l tank to 200 bar using a compressor that can do 100 litre per min

Many thanks

 

[Diver0001]

24 minutes

The volume of the tank is 12 liters. The pressure is 200 bar when full so 12*200 = 2400. 2400/100 = 24

Why do you need to know this?

R..

 

[Remy B.]

Be careful to not experiment with compressors that are not purposely made for filling tanks.

 

[glassbottom]

Be careful to not experiment with compressors that are not purposely made for filling tanks.

To expound on that. He means scuba tanks used for breathing gas (some people just use them for paintball etc).

These compressors are expensive, have special filters and oil etc so you dont get engine emissions (like CO) in the tank.

 

[samdefloreal]

Good evening gents
Many thanks Diver0001 for the equation - it's going to be very handy indeed. I am opening a fishing & dive shop and the compressor we got can do 100l per min, so I was wondering how long it would take to fill a 12l tank just so I know what kind of time is needed if I got 12 tanks to fill.

I won't be 'messing' about with compressors Remy B. Got a healthy respect for anything that's under pressure.

The compressor is a Lenhardt & Wagner, made for filling scuba tanks. Indeed these types of compressors are expensive glassbottom...

Another thing I was wondering...the compressor got two filling hose...can I fill two tanks at the same time ?

 

[claymore]

If you are going to be filling very many tanks regularly setting up a bank of storage bottles may be more practical than filling straight from a compressor.

 

[Diver0001]

Good evening gents
Many thanks Diver0001 for the equation - it's going to be very handy indeed. I am opening a fishing & dive shop and the compressor we got can do 100l per min, so I was wondering how long it would take to fill a 12l tank just so I know what kind of time is needed if I got 12 tanks to fill.

I won't be 'messing' about with compressors Remy B. Got a healthy respect for anything that's under pressure.

The compressor is a Lenhardt & Wagner, made for filling scuba tanks. Indeed these types of compressors are expensive glassbottom...

Another thing I was wondering...the compressor got two filling hose...can I fill two tanks at the same time ?

Normally you would invest in a few "50 liter" (12,000 cf) tanks and set them up as a "buffer". That way the compressor fills the buffer and the buffer fills the tanks. This would allow for filling multiple tanks a little quicker, which is why people do this.

Filling multiple tanks from one fill panel is possible. If the tanks do not have equal pressure (which they never will) then what will happen is that first the pressure will equalize between the tanks (filling one tank from the other one until the pressure in both tanks is the same) and then both will fill from the compressor after that. Naturally, all equations about fill times will be times 2.

R..

 

[RayfromTX]

If you plan to do this, you have literally dozens of questions you need to ask and things you need to learn. Enjoy the journey. It may seem simple but it really isn't. Filtration, moisture, analytic testing, fill rates, liability, and what are you putting your compressed air on top of. Can you test to know if someone just handed you cylinder partially filled with pure oxygen so you can top off their tank of nitrox? Do you know what the risks of that are? Lots of fun stuff to learn. Be careful. If you make a mistake, really bad things can happen. I bought a fill setup over a month ago. I've been tweaking and studying ever since and I'm almost ready to fill some cylinders and have the air tested. Wish me luck.

 

[DogDiver]

Wow, you are asking these type of questions and you plan on commercially filling scuba breathing cylinders. WOW!!!
I haven't seen any of your questions about having the gas/air certification tested.
Glad you are overseas and not North Florida.

 

[samdefloreal]

If you are going to be filling very many tanks regularly setting up a bank of storage bottles may be more practical than filling straight from a compressor.

Bingo...just what the doc ordered last night as i could not sleep and kept poking my nose around to find out more and indeed...cascade storage cylinders is the way to go