Also please let me know the estimated volume of air that can be stored in a steel vessel the size and thickness of an LPG cylinder without any danger of rupture.
-
That tank will have a maximum pressure rating stamped right on it.
Here's thre rub. Liquid propane doesn't behave the same as compressed air.
The air pressure increases a lot faster with a rise in temp. then the liquid propane.
If your talking about a standard hand carried propane tank, stay under 50 PSI to be safe,
and even then don't fill it in the shade and then leave it in the sun.
Here's thre rub. Liquid propane doesn't behave the same as compressed air.
The air pressure increases a lot faster with a rise in temp. then the liquid propane.
If your talking about a standard hand carried propane tank, stay under 50 PSI to be safe,
and even then don't fill it in the shade and then leave it in the sun.
-
LPG as propane has a vapour pressure that increases with temperature (like any gas) so any cylinder supplier would specify a cylinder that could cope with any normally expected temperature. If it's not stamped into the cylinder then the data in the link (41°C = 14bar) shows that you might expect that it could take at least 15 and possibly 20 bar.
Estimate the volume from the outside dimensions and the pressure that you can apply.
If you really want to use high pressures, eg from dive tank refill, then a hydraulic pressure test is the way to go.
Estimate the volume from the outside dimensions and the pressure that you can apply.
If you really want to use high pressures, eg from dive tank refill, then a hydraulic pressure test is the way to go.
-
whatever you do DO NOT exceed rated pressure, you don't want the shrapnel ripping off your head or anything right? otherwise its a function of pressure, volume density and temperature, can be calculated using ideal gas law:
[quote wikipedia]
The density of dry air can be calculated using the ideal gas law, expressed as a function of temperature and pressure:
ρ=p/(Rspecific*T)
where ρ is the air density, p is absolute pressure, Rspecific is the specific gas constant for dry air, and T is absolute temperature. // note: in kelvins
The specific gas constant for dry air is 287.058 J/(kg·K)
[/quote]
if you have the density you can calculate the mass of gas by multiplying it with your volume
for example, here is the formula, just replace temperature, pressure and volume
http://bit.ly/lSG22t
note, if you get a weird unit for result click "Use joules per kilogram kelvin of temperature instead"
mathematica confuses some of the units in the equation
note:
volume of gas in an enclosure is always volume of that enclosure
[quote wikipedia]
The density of dry air can be calculated using the ideal gas law, expressed as a function of temperature and pressure:
ρ=p/(Rspecific*T)
where ρ is the air density, p is absolute pressure, Rspecific is the specific gas constant for dry air, and T is absolute temperature. // note: in kelvins
The specific gas constant for dry air is 287.058 J/(kg·K)
[/quote]
if you have the density you can calculate the mass of gas by multiplying it with your volume
for example, here is the formula, just replace temperature, pressure and volume
http://bit.ly/lSG22t
note, if you get a weird unit for result click "Use joules per kilogram kelvin of temperature instead"
mathematica confuses some of the units in the equation
note:
volume of gas in an enclosure is always volume of that enclosure