Calculate KGs of CNG in cylinder

[wasrana]

Here is a method wtih which you can roughly calculate the ammount of CNG in your car's cylinder.

Boyle's Law
P1V1=P2V2

assuming that naural gas is an ideal gas at ideal temp.

P1=Pressure indicated on your gauge in PSI

V1=The capacity of your cylinder in liters which is usually between 50-60 liters

P2=14.6 which is atmoshperic pressure

V2=you will get liters of CNG at atmospheric pressure

Divide V2 by 1400 and you get KGs of CNG

Example:

P1=1400
V1=55
P2=14.6

V2=1400*55/14.6=5274 liters

V2=5274/1400=3.77 KGs

It might help calculating the milage!

[Decent_Driver]

Nice info.

[mn_akram]

brother but how could we know the atmospheric pressure it will be different under different conditions ? plz explain

[raoshahzad]

Here is a method wtih which you can roughly calculate the ammount of CNG in your car's cylinder.

Boyle's Law
P1V1=P2V2

assuming that naural gas is an ideal gas at ideal temp.

P1=Pressure indicated on your gauge in PSI

V1=The capacity of your cylinder in liters which is usually between 50-60 liters

P2=14.6 which is atmoshperic pressure

V2=you will get liters of CNG at atmospheric pressure

Divide V2 by 1400 and you get KGs of CNG

Example:

P1=1400
V1=55
P2=14.6

V2=1400*55/14.6=5274 liters

V2=5274/1400=3.77 KGs

It might help calculating the milage!

V2=5274/1400=3.77 KGs

is this 1400 is constant or is the PSI

[onlyfaith]

informative!

[Morani]

Hard to agree.. it gives info on volume, rather than weight or mass...

[alee1]

Hard to agree.. it gives info on volume, rather than weight or mass...

nothing is impossible.volume can be converted to mass
density=mass/volume
multiply volume with density u get mass
multiply mass with 9.81 n u get weight.
regards

[waqas34]

Here is a method wtih which you can roughly calculate the ammount of CNG in your car's cylinder.

Boyle's Law
P1V1=P2V2

assuming that naural gas is an ideal gas at ideal temp.

P1=Pressure indicated on your gauge in PSI

V1=The capacity of your cylinder in liters which is usually between 50-60 liters

P2=14.6 which is atmoshperic pressure

V2=you will get liters of CNG at atmospheric pressure

Divide V2 by 1400 and you get KGs of CNG

Example:

P1=1400
V1=55
P2=14.6

V2=1400*55/14.6=5274 liters

V2=5274/1400=3.77 KGs

It might help calculating the milage!

or may be you can just see the kgs of gas filled on filling station pannel:D:D:D...
come on man...the cylinder size mentioned on cylinder (40-45-55-60) is the volume of water (liter or kg) coz the density of water is 1g/cm3...now you want to compare it with the volume of gas for which you must know the density of gas...and at the end both volumes could'nt be compared coz they are different fluids:D...any way thanks for reminding me the old chemistry book

[tayyabbaig]

nice calculation info

[babarhyd]

or may be you can just see the kgs of gas filled on filling station pannel:D:D:D...
come on man...the cylinder size mentioned on cylinder (40-45-55-60) is the volume of water (liter or kg) coz the density of water is 1g/cm3...now you want to compare it with the volume of gas for which you must know the density of gas...and at the end both volumes could'nt be compared coz they are different fluids:D...any way thanks for reminding me the old chemistry book

Actually i was thinking the same thing, why not just see the panel at CNG Filling station and calculate your average.! +1

[waqas34]

Actually i was thinking the same thing, why not just see the panel at CNG Filling station and calculate your average.! +1

additionally the calculation method provided here is 100% wrong...you can calculate kg of gas filled in your cylinder (if you have enough time to waste) but surely it couldn't be calculated through this method...