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Old 09-17-2012, 09:53 PM #1
TeacherCreature
 
 
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dry ice tank fills?

anyone ever experiment with this?
http://www.youtube.com/watch?v=DWcRD...=youtube_gdata
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Old 09-17-2012, 10:37 PM #2
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Lots of reasons not to consider this...
It would be way more expensive than than using a bulk cylinder of Co2 to fill a tank.
Takes way too long to fill then you still need to wait for the Co2 to sublimate into usable gas.
If it is cold out it may never get to full pressure.
If it is hot out you will lose much of your Co2 before you get it in the bottle.
Much more of a PIA storing solid Co2 than Gaseous Co2.
Way too easy to overfill.
loosening that seal every time you want to fill a tank is asking for a gas propelled missile to the face.
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Old 09-17-2012, 10:45 PM #3
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Well I suppose if you want to improve your chances of injuring, maiming, or killing yourself, that's a good way to do it.

It probably goes without saying that his method of valve installation/removal probably isn't an approved method. Cylinder valves have torque specs for a reason.

Speaking of torque specs, burst disks also have them. The amount of torque will impact at what pressure the burst disk ruptures. Install it too loosely and it won't rupture at the proper pressure.

Overfilling a CO2 tank can cause over-pressurization. This graph illustrates it best:

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Old 09-17-2012, 10:47 PM #4
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Old 09-18-2012, 09:24 AM #5
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I have seen it before. It is for the home soda machines. They have a special tank fitting on the bottles. You have to send them in to get it refilled and it is pretty expensive.
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Old 09-18-2012, 10:32 AM #6
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Obviously I was not suggesting his methods just opening the discussion of using solid dry ice as a fill instead of liquid. I am mostly interested in the cost saving benefits if any.
It would certainly eliminate the need for supply tanks fill station etc
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Old 09-18-2012, 10:48 AM #7
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Cost saving for consumers to fill their own soda stream tanks? Maybe, but probably not worth the hassle.
Cost savings for you to fill customers Co2 tanks? No way.

Storing Gaseous Co2 is easy and has no waste even after months of non use.
Storing solid Co2 is a pain in the butt and must be kept frozen or it will all just disappear.

Filling a tank with gaseous Co2 takes a few seconds. Removing your customers valves and filling their tank with solid Co2 will cause them to leave in disbelief and in danger.

The best way to save money on Co2 Fills is to not do them at all. Put your money into some extra air tanks and rent those out to customers that would normally use Co2.
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Old 09-18-2012, 10:51 AM #8
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That was kind of what I was thinking was the answer but I thought it was worth mentioning when I saw the video, not to mention that moment of cringing as he removes valve
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Old 09-20-2012, 12:47 AM #9
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Went to a tech conference with Tom Kaye and Bud Orr back in the mid 90's and listen to them talk about how they used to fill small cylinders with dry ice long before "constant air" was available..... both agreed it wasn't a good idea, haha
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