How To Properly Measure The Amount Of LPG Gas Remaining In A Gas Cylinder Before A Refill

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LPG worth (LW) is the amount of LPG gas that can be contained in a gas bottle. LPG Worth helps us to know the level of LPG gas that should be refill, so as to prevent overfilling. You can see the LPG Worth (LW) stamped on every gas cylinder bottles neck ring you see.

For a 50kg propane gas bottle, with details as follows:

Tara Worth (empty weight) => 50kg

Net Weight => 47kg

Scale Reading => 50kg (along with the gas bottle dimensions)

LPG Worth => 45kg

Water Capacity => 100.2 Litres

So, to get the LPG Worth, to know approximately how much of gas remnant in the 50kg tank - Tare Worth is subtracted from scale Reading.

50kg - ??? (let's assume the scale reading as 60kg).

LPG Worth will be 50kg (empty weight) - 60kg (scale reading) => 10kg (gas reminant). 

To refill the 50kg together with the 10kg gas reminant at the refilling site:

50kg (empty weight) - 10kg (gas reminant) => 40kg (LPG Worth)