Baby co2 filling setup?

[Skoad]

Just was thinking...

I recently got a 3.5 oz co2 tank. Now this the ONLY sized tank I can use with my setup (pictures to be released at a later date). Now I have access to a lot of 20 oz tanks. I was wondering is there a way i could set up a mini-fill station that i could fill the 3.5 off of the 20's?

[magmanl337]

http://rap4.com/os/product_info.php/cPath/22_157_70_56/products_id/272

It costs $40, but you can easily make it from buying two remote lines from ebay cheap and attaching a stainless steel hose between the two.

[trains are bad]

make the big tank into a siphon tank or just hold it upside down.

[Skoad]

ok, i thought i could do that but wasn't sure if it needed to be regulated.

So can i just straight fill like that and don't need to worry about busting the 3.5?

Edit: So wait, alls i need is basically 2 on/offs and a SS hose?

[TheTramp]

ok, i thought i could do that but wasn't sure if it needed to be regulated.

So can i just straight fill like that and don't need to worry about busting the 3.5?

Edit: So wait, alls i need is basically 2 on/offs and a SS hose?

Yup, just turn that 20oz upside down (or install a siphon tube) and you'll be all set. You can't over pressurize the 3.5 because as soon as it it full it won't take any more liquid unlike HPA.

Remember to chill the 3.5 first and shake it as you fill it.

Also, screw both thanks in, close the 3.5's on/off THEN close the 20's on/off.

[Skoad]

ok, so no need to weigh.

and what do you mean by "chill"

[MarkM]

Yup, just turn that 20oz upside down (or install a siphon tube) and you'll be all set. You can't over pressurize the 3.5 because as soon as it it full it won't take any more liquid unlike HPA.

Remember to chill the 3.5 first and shake it as you fill it.

Also, screw both thanks in, close the 3.5's on/off THEN close the 20's on/off.

Not true and dangerous as far as the over filling is concerned with a chilled 3.5oz bottle you can put a lot of liquid CO2 in without any great problems. To not weigh a bottle is asking for trouble...ultimate pressure is approx 800-900 psi (properly filled) but with such a small tank I wouldn't like to risk it (over filling) as burst discs are not always at the pressure they should blow at...keep to what it is supposed to filled at. So always weigh the tanks. A friend of mine nearly died when 20oz tank valve failed and it left him with over 30 stiches in his head...this was with a weighed tank with the correct amount of CO2 inside...overfilled he wouldn't have been still with us.

ok, so no need to weigh.

and what do you mean by "chill"

Chilling a CO2 tank is the same for all tanks that use CO2 you fill as much as you can (when warm) and then dump this partial fill of CO2 this will chill the tank so that it accepts CO2 in it's liquid form easier.

[Thordic]

Get a digital fish scale that will weigh 3 ounches accurately.

Tare it to the weight of the empty tank + hose/etc.

Then fill.

[Skoad]

ok, so weigh it is :P

wonder how many fills i will get out of a 20oz after chilling

[TheTramp]

Not true and dangerous as far as the over filling is concerned with a chilled 3.5oz bottle you can put a lot of liquid CO2 in without any great problems. To not weigh a bottle is asking for trouble....

You're right. I guess I'm just used to filling 12 and 20 off of a 15lb tank and I can bairly get a complete fill (I have used a scale many time) so I don't really worry about it.

But you're right. Better safe that VERY sorry.

[magman007]

i thought 3.5 tanks werent based on weight? they were based on the amount of liquid they could hold. i thought this was true with anything below 5 oz's please correct me if im wrong

[jewie27]

The problem with that setup is that you are not weighing the bottle while filling. All Co2 cylinders must be filled to their proper weight, i.e. 5 oz, 9oz, 16oz, or 20oz and so on...

I fill cylinders at work almost every day.

[Skoad]

good question magman, that would change things.

Anyone know?


also I know they are exempt from DOT retesting, wonder why that is?

[jewie27]

good question magman, that would change things.

Anyone know?


also I know they are exempt from DOT retesting, wonder why that is?

That is false. All Co2 cylinders need to be hydro tested every five years.

To weigh the cylinders, use a digital fish scale.

[trains are bad]

false. Cylinders under 2" diameter are exempt.