CNG / LPG Rating  :      

Depending upon the fuel, Natural gas vehicles can be categorized into LPG & CNG. While LPG is acronym for Liquefied Petroleum Gas, CNG stands for Compressed Natural Gas.

Most consumers often use them as if they are the same, but their difference starts right from their state of existence. LPG exists in Liquid form, whilst CNG is in gaseous state. Both can be clubbed under Natural Gas Vehicles (NGVs’).  Driving a CNG or LPG car is as different as a Petrol Vs Diesel Car. Right from the outset i.e. their formation, distillation, storage and transportation are altogether different. The article digs deep into the technology behind the CNG & LPG.
Compressed Natural Gas (CNG) – A by-Product of natural gas

Compressing natural gas to less than 1 % of its volume, at natural atmospheric pressure, results in a CNG, which is then stored in the containers at about 3000 psi pressure. Hard containers with thick outer walls are required to store CNG gas due to it being in a high pressure state. This makes it costly to manage than the other gaseous fuels like LPG though it is significantly cheaper than the traditional fuels powering the mobility like petrol & diesel. As CNG require relatively larger space to store, natural gas is transferred to the distances in the form of LPG & then converted into CNG at respective stations.  

Liquidied Petroleum Gas (LPG)

It is predominantly methane CH4; in liquid form. It is odorless, colorless & non-toxic in nature. Due to its liquid form, it is relatively easy to transport. To put into perspective, it just takes 1/600th space when compared to natural gas. Therefore for the ease of transportation, LPG is very efficient & effective medium. However being heavier than air, there are many safety concern relating to LPG. It’s quite vulnerable to fire accidents in case of any leakages as unlike CNG it won’t evaporate, but get accumulate under the tank

Ready reckoner between CNG, LPG & OTHER FUELS

Environment Friendly
Cost Effective proposition
Future potential
Economic to Maintain
Lack of infrastructure facilities (Gas based filling stations)  across the country is a great barrier hindering their growth as an alternate fuel in India. Smaller storage capacity of their tanks limits their driving range, this along with limited filling stations is a big issue against them, Dual fuel car i.e cars capable of running on gasoline and CNG/LGP has managed to handle the driving range issue quite effectively today, a solution which has helped adding to the number of cars being driving on these alternate fuels.

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