- Written by Eric Hahn
LPG Conversions: Gas kg, Litres, MJ, kWh & m³
Also Pounds, Gallons, BTU, Therms & ft³
LPG Specific Gravity - Density
LPG Gas Consumption in Megajoules
Appliance Output in kWh
BTU to MJ Conversion
LPG Liquid to Gas Volume Expansion
Gas Bottle Tare Weight
Measuring LPG by Pressure
When LPG (propane) is stored in a gas bottle, it is under pressure.
The term “pressure” refers to the average force per unit of area that the gas exerts on the inside walls of the gas bottle.
The pressure is measured in kilopascals (kPa).
“Bar” is yet another unit of measure for pressure. 1 Bar = 100 kPa, so it is metric based but not an SI unit of measure.
LPG pressure can vary greatly based on temperature.
The level of fill in the gas bottle comes into play when the LPG is being used, as it affects the rate of vapourisation.
As LPG is a liquefied gas, the pressure inside the cylinder will remain the same from full to empty (after the last of the liquid LPG is used), then the pressure will fall quickly as the last of the LPG vapour is used.
The use of Pressure as a measurement in LPG use is very limited.
A steady Pressure only shows that liquid LPG is inside the cylinder, and not how much liquid is left.
In the US, pressure is measured in pounds per square inch (psi).
Psi is defined as 1 pound of force applied per square inch. As a comparison, 1 psi = 6.89476 kPa.
LPG (Propane) Conversion Table: kg, Litres, MJ, kWh & m³
Propane Conversions Table: Pounds, Gallons, BTU, Therms & ft³
For our friends in the USA:
Propane conversion values in US gallons, pounds, BTUs, therms and cubic feet.
Propane Gallons to Pounds: 1Gal = 4.23lbs
Propane Pounds to Gallons: 1lb = 0.24 Gallons
Propane Gallons to BTU: 1 Gal = 91,502 BTU
Propane Pounds to BTU: 1lb = 21,594 BTU
*Propane Gallons to ft3: 1 Gal = 36.38ft3
*Propane Pounds to ft3: (1lb = 8.59 ft3
BTU to Therms: 1 BTU = 0.000009993 Therms
Therms to BTU: 1 Therm = 100,067 BTU
45 kg LPG Gas Bottles
45 kg gas cylinder sizes are the most common size for home use
This is the size used for our Home Gas Bottle Exchange Service
They are also used with our Automatic Tanker Delivery Service
A typical installation has two 45kg gas bottles
Capacity: 88 litres
90 kg LPG Gas Cylinders
90 kg gas cylinder sizes are the second most common size for home use
This size is commonly used with our Automatic Tanker Delivery Service
A typical installation has one cylinder
90 kg is also used with our Underground LPG Gas Storage System
Capacity: 176 litres
210 kg LPG Gas Cylinders
210 kg gas cylinder sizes are provided for high volume use
Larger storage vessels are also available, when needed
Filling is via our Automatic Tanker Delivery Service
Capacity: 411 litres
Comments, questions or feedback?
The information in this article is derived from various sources and is believed to be correct at the time of publication. However, the information may not be error free and may not be applicable in all circumstances.