Nitrous tank freezing before filling

[shmuggums90]

Hey all -
Does everybody freeze their tanks prior to refilling? Am I the last to hear of this? Or is my fill shop high? Seems like pressures would be higher if filled at freezing?
Please - freeze or no freeze?

 

[swordfish]

We always put ours in a cooler full of ice or the fridge before we fill them.

jeff

 

[shmuggums90]

So is this to squeeze more juice in the bottle? Would the room / outside temperature make the bottle pressure be too high?

 

[4g64GST]

it wold help more in the winter when bottle pressure would be lower, having the extra in would help. but freezing ,filling and then going out in 100 degree weather would mean a lot of purge or you would lean out.


just get a bottle heater and dont worry about it. just my .02 worth

 

[rforres]

maybe ur shop doesnt has a n2o pump and they are "gravity filling", then the bottle has to be cold .

 

[CJCAVITT]

every shop i ever use to fill my nitrous chilled the bottle before filling

 

[JohnTSI]

I have never seen a shop not freeze a bottle befor filling it.

 

[Chuck_3]

mine would sit in my close to empty freezer

 

[DSMJim]

I have had my bottle filled at 15 different shops (including the one where I work and I fill other people's bottles) and never heard of freezing the bottle before filling it.

In regards to "gravity filling" is this what people are seeing when their bottle is filled? A typical nitrous transfer station has an air line hooked up to it and when filling the bottle makes a really loud and heavy CHA CHA CHA CHA CHA type sound. It's like a valve opening and shutting hard with compressed air flowing through it. The more your bottle is filled up the slower the noise gets. After your bottle is full it should be pretty damn warm as well from the gases changing from one bottle to the other..

I wonder if places freezing the bottle are doing it only because the bottle gets so warm and they are afraid of the releif valve blowing open?

 

[Chuck_3]

the guy who filled mine said right now since its kind of cold i can fit about 7lbs in your 10lb bottle but if you drop it off and let me freeze it for 2hours i can get 10lbs in there easily and everywhere they take it they tell me if you freeze it we can get more N20 in the bottle...so to save the wait i kept it in my freezer

 

[NosLaser]

It's very common practice to freeze the bottle before filling it. It creates a low pressure area and allows more nitrous to be put into the bottle. It isn't uncommon to squeeze 12 pounds of nitrous into a 10 pound bottle.

Regards,

 

[rforres]

from my understanding, some places choose not to have the nitrous filling stations, if u have a frozen 10lb bottle and a room temperature tank, when the small frozen bottle valve is opened it sucks n2o from the larger room temp tank. some friends were explaining this to me as they were going to buy nitrous in bulk but not the filling station.

 

[DSMJim]

It's very common practice to freeze the bottle before filling it. It creates a low pressure area and allows more nitrous to be put into the bottle. It isn't uncommon to squeeze 12 pounds of nitrous into a 10 pound bottle.

Regards,

This makes sense, however I can get 12lbs in my bottle without freezing it and have done so many times since I fill my own bottles at work. I'm still not sure how freezing the bottle does any good? It doens't fill faster nor does it allow more to be filled in, so whats the point? The air compressor helps pump it into the tank and it will pump up to over 12 lbs of nitrous in a standard bottle if you let it go long enough. The pump gets slow but it will do it. Believe me, been there done that (emptied in a night... )

 

[NosLaser]

Jim,

It actually does help the bottle fill if you don't have a pump on it. Just think about how pressures work. Just like in a boosted application, when intake air hits a closed intake valve, it's going to bounce back and go to the nearest low pressure area; your intake plenum if it's big enough, or the next closest is going to be the intercooler. With the lower pressure in the frozen bottle, the nitrous is able to get a more complete fill. Another big reason to freeze the bottle is that a lot of racers won't completely empty the bottle. If you go to fill a bottle (without a pump) and it has say a pound or two of nitrous in it, without freezing, the pressure in the bottle will be too high to get a complete fill; enter frozen bottle.

Regards,

 

[NX RuLeZ]

To all,

Chilling the bottle helps transfering N2O quicker as opposed to an ambient temperature bottle.The cool bottle helps keep gas temp down for a while allowing for more gas to be filled. Once you've nearly reached full capacity,( the last 2-3 lbs) transfered gas temp rises up and makes it much more time consuming.
Also if you fill up a bottle from empty, it is so much easier to fill it up comparing to say a bottle that has some left over gas in it..

Regards..
NX filling station(average ambient temp.28-32 deg celcius)

 

[Thomas91169]

colder gases are more dense and compressed, whereas hotter gases expand and fill up more space. frezzing the bottle would allow the gases to compress thus letting more nitrous in.

 

[86MCSS]

colder gases are more dense and compressed, whereas hotter gases expand and fill up more space. frezzing the bottle would allow the gases to compress thus letting more nitrous in.

Exactly. I have never seen a shop not freeze a bottle before filling. Different strokes for different folks

 

[GSGoinFast]

This makes sense, however I can get 12lbs in my bottle without freezing it and have done so many times since I fill my own bottles at work. I'm still not sure how freezing the bottle does any good? It doens't fill faster nor does it allow more to be filled in, so whats the point? The air compressor helps pump it into the tank and it will pump up to over 12 lbs of nitrous in a standard bottle if you let it go long enough. The pump gets slow but it will do it. Believe me, been there done that (emptied in a night... )

how much pressure is in your bottle when you put 12 lbs in a 10 lb bottle? arent you afraid of blowing that safety valve on the bottle?

 

[evil_eagle]

You ever grabed a bottle after it just got filled without frezzing it? Damn thing is hot as hell and the pressure is sky high right after filling it. I have seen people blow the holy hell out of there cars due to using the nitrous right after they just filled the bottle. Not a good thing.

It's much eaiser to fill the bottle when the bottle has been froze, some claim they can get more in the bottle if it is froze, others just say they would rather fill it froze due to the bottle getting hotter then shit. I had my bottle filled without freezing it and got it back right after and I was nervous about being around the damn thing as the bottle was really HOT! The pressure was like 1600psi

-Jake

 

[na90dsm]

i work with freon all the time and its somewhat the same. when we heat our bottles(in sunlight, flame is against the law) it raises the pressure in the bottle so we can get more freon into your a/c system.but in the same prespective if we get our bottles cold its harder for us to get it out of the bottle because the system has more pressure then the bottle so itll actually try to get the freon out of the system into our bottles.

just some info

 

[gotjuice01]

I fill bottles 5 days a week @ Dragway 42 in West Salem ,OH.I have an NX filling station,best on the market,when u chill a bottle down before u fill it , it keeps bottle psi down around 1100psi when it is completely full,(and yes,overfilled also),therefore u can go put the bottle directly back into your car and make another pass without purging half the N2O away or going lean.