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Dukemeister
PostPosted: Thu Feb 08, 2024 6:34 pm 
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Location: Kingston, ON
Anyone know or have a reference to the safe operating pressure of a Sodastream CO2 cylinder?
I know CO2 liquid/gas are at equilibrium at about 1000 psi at around 90F, but I have always gone with a safe pressure of 1500 psi when filling a CO2 rifle (like QB78) with HPA; IIRC, there is usually a 1.8k psi burst disk on paintball CO2 cylinders. I may want to adapt a Sodastream cylinder to HPA, attached to a 800 psi paintball regulator, but I need to know how much I could safely (hand) pump up the cylinder - my plan is 1500 psi, and equip the fill valve part of the regulator with a 1.8k burst disk instead of the typical 5k burst disk.


Attachments:
sodastream HPA.jpg
sodastream HPA.jpg [ 245.78 KiB | Viewed 609 times ]

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McRobert
PostPosted: Fri Feb 09, 2024 7:24 am 
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Posts: 566
Location: East Of Hamilton
Duke my soda stream bottle has a test pressure of 250 bar (PH 250 bar) but it doesn't show a PW. On my other bottles the PW is 2/3 of the of the test pressure. PW 300 PH 450
250 X2/3=166 bar =2407 psi

I found this online to support my calculations https://www.spudfiles.com/viewtopic.php?p=390396

Edit: https://www.aliexpress.com/item/4000994188565.html?spm=a2g0o.productlist.main.15.561dDpH1DpH17D&algo_pvid=d733b4d9-9601-4ee9-82dd-00cc4b6d74cb&algo_exp_id=d733b4d9-9601-4ee9-82dd-00cc4b6d74cb-7&pdp_npi=4%40dis%21CAD%2148.02%2135.06%21%21%2134.87%2125.46%21%402101c59817074815255533003eef3a%2110000013252989468%21sea%21CA%214381166741%21&curPageLogUid=sJmeSQCfvDK0&utparam-url=scene%3Asearch%7Cquery_from%3A
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Daryl
PostPosted: Fri Feb 09, 2024 11:45 am 
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Location: P.G. B.C.
Soda Co2 0.6L Bottle Tank Cylinder 2200psi 15MPA High Compressed Bottle with Valve TR21*4

Interesting, Mac.

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Dukemeister
PostPosted: Fri Feb 09, 2024 11:52 am 
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Awesome guys, thanks. I should be safe even a t 2000 psi fill, with a higher rated burst disk of course. The thread in the sodastream is M18x1.5 and the TR21-4 is a CO2 standard, but not for typical paintball CO2 fittings and HPA tanks. I think there are screw on adapters to go from the TR21 to HPA fitting , but I think it's pretty easy and neater just to remove it from the tank and thread in a HPA Fill and regulater fitting. :D :drinkers:

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Dukemeister
PostPosted: Thu Feb 22, 2024 9:33 pm 
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Got all the parts together today, hand pumped now to 100 bar on my way to 160 bar - I've put about 300 pump strokes in so far. It looks like a winner!
<edit>Oh, forgot to mention, decided to go with a 80% nitrogen fill for the first cycle. :lol: :lol: :lol: :lol: :lol:


Attachments:
Soda HPA 1.jpg
Soda HPA 1.jpg [ 651.6 KiB | Viewed 442 times ]
Soda HPA 2.jpg
Soda HPA 2.jpg [ 354.72 KiB | Viewed 442 times ]
Soda HPA 3.jpg
Soda HPA 3.jpg [ 258.21 KiB | Viewed 442 times ]

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pistolero
PostPosted: Thu Feb 22, 2024 11:27 pm 
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Great discovery Duke
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McRobert
PostPosted: Fri Feb 23, 2024 7:24 am 
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Location: East Of Hamilton
440 strokes was my max with my hand pump. I ordered first Yong Heng compressor the next day.
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Dukemeister
PostPosted: Fri Feb 23, 2024 8:20 am 
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McRobert wrote:
440 strokes was my max with my hand pump. I ordered first Yong Heng compressor the next day.

I don't mind putting in the work, as long as I can reap the rewards.
In my younger day, I used to hand pump a 48 ci (786 cc) HPA bottle to 3000 psi. It was well over 1000 strokes. But I had one with a leaky regular and it leaked out 2x which lead to frustration; after that I ordered a 13 ci (210cc) bottle which is manageable - it has also leaked out a few times through the Foster fill check valve, but it fills in 300 strokes to 3000 psi so not such a piss off. The sodastream bottle is 600cc (37 ci) but I'm aiming at 2000-2200 psi so I should get it done in 500-600 strokes. Maybe I will get a compressor one of these days. :drinkers:

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South
PostPosted: Thu Feb 29, 2024 11:27 am 
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I have couple of such CO2 bottles. I had made a hydrotest up to 380 bar each of them. Bottles don't deformed. So I guess I can use them at 200-220 working pressure
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Dukemeister
PostPosted: Thu Feb 29, 2024 12:52 pm 
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South wrote:
I have couple of such CO2 bottles. I had made a hydrotest up to 380 bar each of them. Bottles don't deformed. So I guess I can use them at 200-220 working pressure

To be safer, maybe stay down at 200 bar, gives a better factor of safety. Since I'm hand pumping I stopped at 2400 psi, 166 bar - it's a challenge the volume is 0.63l.

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South
PostPosted: Fri Mar 01, 2024 3:09 am 
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My bottles are less volume - 280cc.
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Atlas_cn
PostPosted: Fri Mar 01, 2024 10:28 am 
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Location: Ontario
Ouch, didn't know we can use that--I believe it is sufficient for 500-600fps rifle/pistol, 2000psi should give about 150 or even more shot count. :idea:

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Atlas_cn
PostPosted: Fri Mar 01, 2024 10:31 am 
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Joined: Thu Feb 10, 2022 12:29 pm
Posts: 235
Location: Ontario
Dukemeister wrote:
McRobert wrote:
440 strokes was my max with my hand pump. I ordered first Yong Heng compressor the next day.

I don't mind putting in the work, as long as I can reap the rewards.
In my younger day, I used to hand pump a 48 ci (786 cc) HPA bottle to 3000 psi. It was well over 1000 strokes. But I had one with a leaky regular and it leaked out 2x which lead to frustration; after that I ordered a 13 ci (210cc) bottle which is manageable - it has also leaked out a few times through the Foster fill check valve, but it fills in 300 strokes to 3000 psi so not such a piss off. The sodastream bottle is 600cc (37 ci) but I'm aiming at 2000-2200 psi so I should get it done in 500-600 strokes. Maybe I will get a compressor one of these days. :drinkers:


Get a compressor--I used to use hand pumps, and fill an 300cc bottle will take 2-3 hours or more--as I usually punp 40-50 times then stop and wait till the pump to cooling down as the pump used to leak due to the high heat make an o-ring partially melt down(they are touch metals and getting extremely hot if you kept pumping in a higher speed.

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A Bunch of
495fps Springers/CO2/PCP
PAL Rated plinkers and target rifles
Finally get my PAL after 1 year waiting
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