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Old 08-29-2006, 02:32 PM   #1
mikeyflanx
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Air Temp

I was letting out the air in my new tank because I was going to replace my value pin and after a while the tank was getting cold I mean real cold as if I just pulled it out of the icebox. I just wanted to know if it was normal for that to happen because I never purged my tank before.
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Old 08-29-2006, 02:36 PM   #2
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if its Co2 then yes
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Old 08-29-2006, 02:37 PM   #3
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As molecules move faster, and are released out into the air, the air and regulator do drop in temperature. Next time, when your tank is filled, and you go to shoot, after a long bust of quick firing, feel your tank and the tank's regulator. You will feel that they are quite cold. - The cold does not affect the performance of the air.

Why is this? I am not entirely sure. Uziel will have more information to cover this.

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Originally Posted by pbsniper111
if its Co2 then yes
Look at his sig. It clearly says "Crossfire 92/4500 HPA HP."

In the thread itself, he says "air." CO2 is not air, it's gas. However, there are some O2 molecules in the CO2. C(carbon) + O2(oxygen)= CO2.
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Last edited by Charmed Life : 08-29-2006 at 02:41 PM.
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Old 08-29-2006, 03:03 PM   #4
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Someone pays attention in science class.
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Old 08-29-2006, 03:05 PM   #5
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Old 08-29-2006, 03:22 PM   #6
mikeyflanx
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Thanks charmed life for brief class session now I can rest easy... Lol really I thought this new guy at the scuba store filled it with co2.
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Old 08-29-2006, 09:44 PM   #7
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Ok, I cant explain this as scientifically as Charmed Life did, but here's the simple answer.
You know how you get your hpa tank back from getting filled, and its warm? Thats because air molecules heat up when they compress. Especially when they Rapidly compress, such as being forced into a tank under high pressure.
Now....in opposite, they cool, when rapidly decompressed under rapid expansion. Which, you are rapidly releasing them from compression, when you are emptying a tank by holding the valve pin down.

Very, VERY short answer is- yes, it's perfectly normal for a tank to get cold when you are letting the air out of it by holding the valve pin down.

Charmed- just read another one of your posts before this one. I'm impressed! So most definitely welcome back!
And from the looks of things, it would appear that both you and Uziel are doing a fine job of making the UK proud
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Old 08-29-2006, 11:30 PM   #8
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I remember when I used to make the long technical posts! Don't have quite so much time now, so I have to cut a few corners. As long as someone is providing the details though, it's all good.
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Old 08-30-2006, 01:51 AM   #9
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Just one tip: Use a disconnected ASA to remoce air, do not hold down the pin. Holding down the pin is more likely to cause damage and puts your fingers damngerouly close to the stream of venting air.
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