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# Thread: Relation between Bars and Kgs

1. ## Relation between Bars and Kgs

What's the relation between Bars and Kgs? Calculations show the other results while filling some 6-7 Kg CNG shows 200 bar on the Pressure gauge.

2. Bar is specific volumetric unit of air pressure - kilogram is weight volume unit of any mass which can be contained in a vessel

what WE see on CNG station pressure meters (BAR in red) in black it is 200- 230 PSI

14.503 PSI (pounds per sq in) = 1 BAR - - 1 bar <= 0.98 kilograms

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when such high pressure is released in cylinder it starts to store when capacity is topped up the pressure sensor in dispenser cut-off the pressure stops the discharge and meter comes to halt.

3. bar and kg are two altogether different dimensions. bar belongs to pressure and kg to mass.
however while filling CNG more the bars on dial more the kg will be filled in cylinder.

4. Originally Posted by drift222
bar and kg are two altogether different dimensions. bar belongs to pressure and kg to mass.
however while filling CNG more the bars on dial more the kg will be filled in cylinder.

Correctly said..... There is no direct relationship between "BARs" and "Kgs". The more you can compress the gas the more you can fill in the cylinder.

The CNG dispenser actually measures the mass of the gas with the help of mass flow meter and it shows this value on its main display and the pressure gauge actually shows how much you can fill in the cylinder. If suppose at 150 Bar pressure 4 Kgs of gas can accomodate in the cylinder then at 200 Bar it may rise to 6 Kgs.

Regards

5. I dont know whether there is any relation between bar and kgs or not, but through my experience of CNG filling and consumption and continuous monitoring of guages I have come to a conclusion that in my cars CNG cylinder a kg equals 23 bars pressure. So when there is 180 bar pressure nearly 8 kgs or under 8kg gas fills in when there is 200 bar pressure nearly 8.6kg gas goes in and when there is 220 bar pressure than 9+kg gas goes in. I do not claim that these calculations are universal truth but they are spot on for my car.

6. you are confusing two different units of measure. The volume of gas is also affected by temperature.

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