locoboy
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| posted on 12/7/07 at 10:20 AM |
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Checking how full a gas bottle is?
I have stumbled accross 2 W size bottles of Argoshield Heavy at work, one with a regulator on it and the one dial is reading 0.35 bar.
Does this determine how full it is?
If so what is 'full' pressure?
If not when how do i find out how full they are?
ATB
Locoboy
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tks
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| posted on 12/7/07 at 10:48 AM |
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It will depend on the size.
If you would read 0 bar then there would be 20liters left, but because of the fact that it won't come out!
you could say its empty..
sow 0,35Bar is empty..
200Bar = Full for a big size cilinder.
dunno the W types...
Hope it makes sense...
also the pressure rise isn't constant with the volume of gas in the bottle sow twice the pressure isn't twice the volume.
in the end every drop of gas more will raise allot of pressure..
Tks
The above comments are always meant to be from the above persons perspective.
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asn163
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| posted on 12/7/07 at 11:45 AM |
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Hi,
As stated above, usual fill pressure will be 200 bar.
0.35 bar would be empty, the cylinder is probably fitted with a residual pressure valve to maintain a slight positive pressure to prevent ingress of
water etc. when "empty".
Simon
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Confused but excited.
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| posted on 12/7/07 at 03:38 PM |
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quote:
Originally posted by tks
also the pressure rise isn't constant with the volume of gas in the bottle sow twice the pressure isn't twice the volume.
in the end every drop of gas more will raise allot of pressure..
Tks
Wrong!
If the tempurature is constant (isothermal compression), then twice the pressure does equal twice the volume.
Basic schoolboy physics.....
If you compress a volume of gas quickly to half it's volume then the pressure will more than double, this is because of the rapid compression
raising the energy level of the gas. This is called adiabatic compression. It will however stabilse at twice the original pressure when it cools back
down to the original gas temperature.
Tell them about the bent treacle edges!
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lsdweb
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| posted on 12/7/07 at 04:18 PM |
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quote:
If not when how do i find out how full they are?
Easy. Open the valve and listen to the hissing. When the hssing stops you know how full it is (isn't!) Sorry - stupid reply!
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NS Dev
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| posted on 19/7/07 at 12:41 PM |
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.....................and all of this depends on the gas of course!!
If it is a compressed gas in there then all that holds true, but if you were talking about CO2, then that is a liquid in its bottle, and the pressure
stays constant (vapour pressure) until all the liquid has vapourised, then it starts to drop.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Peteff
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| posted on 19/7/07 at 01:10 PM |
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Don't worry,
there's loads in it 
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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