How can I measure the amount of LPG gas remaining in a cylinder?

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  • 2 months ago
    Favorite Answer

    use a regulator having upstream pressure guage for fully filled LPG cylinder of known volume or else the weight. Record teh initial reading on the guage. As the LPG is consumed, the reading of pressure guage decreases and weight will decreases. Record that reading. Difference between the pressure readings or weight readings will tell how much gas is remaining.

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    • the comment by oil field trash is correct because liquid phase is inside cylinder. Use mass difference or liquid level difference for LPG

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  • roger
    Lv 7
    2 months ago

    pour  some hot water on the  tank.  You will see the line where the   liquid is inside.

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  • 2 months ago

    There should be a tare weight stamped on the collar of the cylinder.  Propane (LPG) weighs 4.25 lbs per gallon, so you should weight the cylinder and subtract its tare weight to determine the net weight of of the liquid gas within.  Then divide that net weight by 4.25 pounds per gallon to determine the gallons remaining in the cylinder.  If the cylinder contains liquefied natural gas (LNG), then divide by 5.66 pounds per gallon. 

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  • 2 months ago

    If you weighed the cylinder when it was full, and if you know what the original contents were supposed to be, you can weigh it now to see how much is left.

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