The Differences of LNG, CNG and LPG For Various Application

The Differences of LNG, CNG and LPG

The Differences of LNG, CNG and LPG

Natural Gas is component of energy needed for various application both in household and industry scale. There are 3 common commercial gas applications which are LNG (Liquified Natural Gas), CNG (Compressed Natural Gas) and LPG (Liquified Petroleum Gas). LNG and CNG are a natural gas whereas LPG is gas mixture produces as a residue from oil refining process.

Liquified Natural Gas (LNG)

LNG is a natural gas which is converted to liquid by cool it down to -161°C. During the melting process, natural gas must undergo purification to remove unnecessary content. LNG is a natural gas consist of 90% methane with some ethane, propane, butane and nitrogen.

LNG Carrier used to transport LNG

The volume of natural gas in LNG form is estimated 600 times smaller compared to its volume in NG form. Because of that, this form of LNG is possible to transport natural gas easily with large quantities anywhere including area that are not reached by pipeline.


Because of above properties of LNG, it can be used to operate equipment and machine that is sensitive and expensive. The danger of this product is it is flammable when it vaporizes and freezing. LNG Carrier can transport the LNG to terminal LNG which then kept in tank with atmospheric pressure. After being transported in this liquid form, LNG is then converted back to gas to be used.

Read on this: LPG vs LNG vs CNG: Understanding The Difference

Compressed Natural Gas (CNG)

CNG is one of the natural gases which consists of main composition which is methane taken from natural gas. Physically, CNG is a gas obtained from natural oil and also the first product that been separated along distillation process. This gas is made by compressing the natural gas to less than 1% of the occupied volume at standard atmospheric pressure.

CNG in Vehicle

CNG is a natural gas that undergoes compression with high pressure until its volume reach around 1/250 of NG gas volume.  By doing this compression process, it can transport more gas per unit volume tank vessel. CNG that had been supplies to the consumer must fulfill the specification requirement of commercial gas such as the maximum boundary water content and heavy hydrocarbon with the purpose to prevent condensation to happen.

This type of natural gas is ideal for vehicle because from the burning process, it will produce a lower percentage of greenhouse gases compared to gasoline and diesel. Besides, the cost for CNG is found to be 40% lesser than gasoline.

Liquified Petroleum Gas (LPG)

LPG is a natural gas that obtain as side product along the fractional distillation process of crude petroleum oil. LPG component consists of propane and butane or the mixture of both. The original form of LPG is liquid. LPG can easily be melted under pressure until it can be stored economically and transport in cylinder. The purpose of melting of natural gas to become LPG is to make it easier to transport it to user because of the volume of LPG is lower than the original gas volume.

Various size of LPG

LPG is very highly flammable and generated from renewable sources such as natural gas and oil production activities. Other than that, this type of natural gas is the sources of clean energy, affordable and energy efficient. Its high-octane value, increases the engine life, making it perfect for filling vehicle fuel.

LPG is maintained to remain liquid at room temperature until it kept in pressurized tank. As liquified gas, the pressure inside pressurized tank will not change until the last liquid LPG evaporates. Absorption and cryogenic process is some type of process that can be used to process natural gas until LPG product is produce.

Also check on this: What is LPG and Where its Come from?

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