Volume of Compressed Gas in a Cylinder
industry.airliquide.us
P1*V1 = P2*V2 ....
9 liquid liters at 2000 psi = 1224 liters at 14.7 psi ( ie atmospheric pressure)
1224 litres at 35 liters per min total flow = 34 min --- approx 17.5 liters down each of the two hoses.
--- though toward the very end --- when pressure really drops as bottle is almost empty- the flow will drop too when not adjusted ...
-if it is argon through an argon gauge - should still be approx correct / calibrated even on a cheap regulator / flowmeter
----- so you are correct and that other poster does not understand this simple gas law.
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Leaks :
Have you leak checked it ?
Hose seems too big / heavy / incompressible --- ie difficult to make a gas tight seal using a pipe clamp - so - the hose connections all look a little dodgy to me - especially the one to the gas cylinder.
The regulator/ flowmeter output flowing gas will be at an approx fixed pressure from the flow gauge - likely 50psi - for a 1/4 inch / 6mm inner diameter hose- this is higher pressure than a rock hard bike tyre.
Not sure the hose won't just blow off - but looks almost certain to leak at least partially ... Turn it on and see ... have you done this ?
Maybe it is ok ?
That kind of thread reinforced pvc hose is not very compressible - it is pretty rigid- and the "barb" coming off the regulator/flowmeter looks like a 1/4 in FLARE connector - not a proper barb connector -- so even with the hose clamp - I can't see this being very gas tight -- but maybe it is ok.
Pipe clamps can only exert very limited force -- especially the cheapo ones with open notched not just grooves in metal - try scandvik clamps
Turn it on - and wipe some soapy water with a sponge around the joint - bubbles ? yes / no ?
Without a tight joint here - and such long and big bore hoses your setup will not work -- gas will not flow out the end of such long and huge hoses.
Likewise for your splitter -- leaks - have you checked ?
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The other poster who mentioned tape is mistaken - it will not help you.
PTFE tape is for water joints - plumbers joints -- not gas lines
( I know they have special gas tape but it is a crutch and only for metal to metal)
--- and often makes gas joints even worse and anyway is for metal to metal joints ONLY.
Metal to metal joints are meant to have the metal deform and make a gas tight seal - plastering teflon tape everywhere does not usually help for gases.
You do not have metal to metal joints - you have a metal clamp trying to compress a hose against a metal barb --- adding more soft material in the sandwich does not help
You already have the compressible material there ( the hose ...) - covering the sharp barb threads with tape is counterproductive - bad idea ...
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Hose too big / heavy -- cannot tape to bag
Seems impossible also to pre-fill the bag before pulling it down over head - given thick heavy hose not attached to bag on the inside with tape ( would not hold it)
--- this means that quick loss of consciousness is not going to happen per PPH book
-- even trying to squish the bag while on your head - to remove all the air/oxygen when starting - with the hose in there -- and then pulling down over head -- seems like it cannot work -- hose will keep bottom of bag open at neck - so will have loads of air in there that you have to first exhaust or breathe/use up --- prolonging the entire thing
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--- what is to stop hose just falling down out of bag / slipping out under its own weight once consciousness is lost ?
Presumably you would be sitting up -- it is a heavy tube - gravity ... you might move around too ...
Are you going to tape it to your forehead/face / hair ? there is nowhere else above neck height ...
What keeps it in place ?
I cannot see that it will stay put - for absolute certain - this is not a game.
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Seems to be a big problem when can't get an adapter from large 1/4in ( or metric equivalent) flare type connection ( male or female ) from Co2 reg/flowmeter -- down to lightweight thin O2 tubing.
Some people do manage to get slightly thinner soft clear pvc tubing and just stretch / butcher it on to the 1/4 in ID regulator output --for a photo
- but unless it is as thick walled as yours - to take 50psi - it will not take more than 20 psi - per mfg spec - not enough -- so end up with a thick heavy pvc hose just like the one you have coming off the gas cylinder 1/4in ID / 3/8 in OD or bigger.
https://sanctioned-suicide.net/attachments/20200922_174753-jpg.45276/
https://sanctioned-suicide.net/attachments/img_20181023_183046831-1-jpg.2332/
https://sanctioned-suicide.net/attachments/img_20181021_090635-jpg.2253/
https://sanctioned-suicide.net/threads/inert-gas-cylinder-regulator-general-refresher-summary.30657/
Stuck ...
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Standard Argon/N2 regulators / flowmeters all have this problem - big heavy hoses -- and the supplier welding hoses with metal connectors on each end are even worse
Can't easily buy the medical type regulators with the lightweight thin 6mm O2 type tubing that can tape to the bag -- unless go to MDB.
Not otherwise sold to the public any more.
Can't buy a simple Medical twist N2 flowmeter/regulator meant to go with O2 type mini tubing
- unless pay Max Dog Brewing in Australia - $300+ - and wait 8 weeks - if customs do not stop it ( for definite in the EU they will - likely too in USA ) -- then what ?
( for a $40 part ... that is what the O2 one costs - freely available- but money is useless when dead so just pay up) - though they likely sell so few have to charge this to cover cost of having a human deal with it - and nothing else - single product
eg --
https://www.walmart.com/ip/EverOne-...ction-Brass-Sleeve/707584465?wmlspartner=wlpa
-- this $27 one for oxygen -- cannot buy the one for nitrogen if not a medical professional -- and the cylinder connection end is different by design for O2/N2
Note --- the MDB / other N2 parts will over read for Argon -- N2 meter set for 15l /min N2 will only flow 12 l/min Argon -- not enough - but can set it to 25l/min N2 which will give 30 l/min Argon
At least MDB are reputable - around for decades - with a genuine interest in helping people - with identifiable people there -- but the price is just so much - and the wait too long - and customs/delivery an issue too. At least it will work - just cannot be sure can get it through the mail.
Other reputable / real suppliers will not sell to non medical customers - eg WT Farley in USA
Other website sources -- not interested in profit taking resellers of cheapo $10 Alibaba untested / uncalibrated crap that could explode when connected to 2000 psi cylinder and take your eye out. And prices/shipping issues not much cheaper than MDB but without the reliability track record.
Or wake up brain damaged but not dead because flowmeter failed part way through or gave the wrong ( too low or too high) flowrate
This product is no longer available.
medeaselifecn.en.alibaba.com
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Any solutions on connnecting thin O2 tuning to std gas cylinder connections ? --- aside from unhelpful vague "find a barbed connector adapter" -- which is just restating the problem and not giving a solution.
OR --- how to hold thick / heavy hose inside thin fragile 19x 24 in ( approx 14 litre) oven bag -- to pre-inflate bag -- and then to keep it there afterwards ?
