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Compressed Natural Gas

Compressed Natural Gas (CNG) is a clean and environmentally friendly alternative fuel that is used primarily as a substitute for traditional gasoline and diesel in vehicles.

Compressed Natural Gas (CNG) compressors are vital components in the infrastructure supporting the utilization of natural gas as a fuel for vehicles. These compressors are specifically designed to compress natural gas to high pressures, typically ranging from 3,000 to 3,600 pounds per square inch (psi), enabling its storage in onboard fuel tanks of compressed natural gas vehicles.

CNG compressors come in various types, including reciprocating, rotary screw, and centrifugal compressors, each with unique characteristics suited for different applications. Reciprocating compressors, for example, are well-suited for smaller-scale operations and offer flexibility in handling variable flow rates, making them suitable for refueling stations with lower demand. In contrast, rotary screw and centrifugal compressors are often preferred for higher-capacity refueling stations due to their ability to handle larger volumes of gas efficiently.

Efficiency, reliability, and safety are paramount considerations in the design and operation of CNG compressors to ensure the seamless and secure refueling of natural gas vehicles. Regular maintenance and adherence to safety protocols are essential to uphold the integrity and performance of CNG compressor systems, facilitating the widespread adoption of natural gas as a cleaner alternative fuel in the transportation sector.

| Key Points About Compressed Natural Gas (CNG)


CNG is primarily composed of methane (CH4), which is the main component of natural gas. It contains few impurities, making it a cleaner-burning fuel compared to gasoline and diesel.


CNG vehicles typically have a shorter driving range compared to gasoline or diesel vehicles due to the lower energy density of natural gas. This means more frequent refueling stops may be necessary.


Natural gas is compressed to reduce its volume and increase its energy density, typically to pressures between 3,000 and 3,600 pounds per square inch (psi). This compression process allows for efficient storage and transportation of the gas.


CNG is lighter than air, so in the event of a leak, it tends to disperse upward rather than pool on the ground, which can enhance safety. CNG tanks are designed to withstand high-pressure conditions and meet safety standards.


CNG can be used as a fuel for a variety of vehicles, including cars, trucks, buses, and even some two-wheelers. Some vehicles are designed to run exclusively on CNG, while others can switch between CNG and gasoline/diesel using bi-fuel systems.

Conversion Kits

Some existing gasoline or diesel vehicles can be retrofitted with CNG conversion kits, allowing them to run on natural gas. However, these conversions should be done by certified professionals to ensure safety and compliance.


CNG refueling infrastructure includes compression stations where vehicles can fill their tanks. While the infrastructure is not as widespread as traditional gasoline and diesel stations, it is expanding in regions with a growing interest in CNG vehicles.

Environmental Considerations

While CNG is cleaner than traditional fuels, it is not emissions-free. The environmental benefits depend on the source of the natural gas and the efficiency of the vehicle.

| Advantages

Environmental Benefits

CNG is considered a cleaner fuel because it produces fewer emissions of pollutants like carbon dioxide (CO2), nitrogen oxides (NOx), and particulate matter compared to gasoline and diesel.


CNG is often less expensive than gasoline and diesel, providing potential cost savings to consumers and businesses.

Abundant Supply

Natural gas is widely available and is considered a domestically sourced energy resource in many countries.

CNG is considered a transitional fuel in the transition towards more sustainable and environmentally friendly transportation options, such as electric vehicles (EVs) and hydrogen fuel cell vehicles (FCVs). Its use can help reduce emissions and dependence on petroleum-based fuels, especially in sectors like public transportation and fleet operations.