Fuel consumption remains the most significant operational expense for truck fleets. By introducing a Compressed Natural Gas-Diesel Dual Fuel (CNG-DDF) option for 20 models, ISUZU is offering a strategic, cost-effective, and reliable solution in an unpredictable fuel market. The automotive application of CNG is well-established, with over 14 million Natural Gas Vehicles (NGVs) operating in 80 countries worldwide.
Understanding CNG vs. LPG
It’s important to note that CNG (Compressed Natural Gas) differs significantly from LPG (Liquefied Petroleum Gas). While CNG is composed of methane, LPG consists of propane and butane. CNG is typically used as a substitute for petrol or diesel in vehicles, whereas LPG finds use in industrial, refrigeration, agricultural, and catering sectors. CNG is lighter than air and disperses quickly, reducing the risk of ignition in case of a leak. Additionally, it produces fewer carbon emissions, making it a safer and more environmentally friendly option compared to LPG.
Proven Reliability
ISUZU Motors South Africa (IMSAf) has spent the past five years rigorously testing a fleet of CNG-DDF converted trucks, demonstrating their reliability. The dual-fuel system allows the diesel engine to operate with a mixture of diesel and natural gas, with a seamless switch to 100% diesel when needed. This flexibility ensures consistent performance without compromising engine power or trip times.
Environmental Benefits
The use of CNG in truck fleets offers several environmental advantages:
- Reduced Carbon Footprint: NGVs emit 20-25% fewer greenhouse gases and virtually no toxic pollutants.
- Lower Particulate Emissions: Cleaner combustion reduces particulate matter.
- Quieter Operation: Natural gas combustion is smoother, resulting in less engine noise.
- Extended Engine Life: Fewer carbon deposits lead to better engine performance and longer engine life.
- Improved Engine Oil Quality: Reduced carbon emissions help maintain the quality of engine oil.
Operational Efficiency
Operating a CNG-DDF truck is straightforward:
- A simple button press switches between dual-fuel mode and 100% diesel mode.
- The system automatically reverts to diesel when the natural gas cylinder is empty or if a fault is detected.
- Refueling with CNG is quick, avoiding the lengthy charging times associated with electric trucks.
- Driver training is essential to maximize the benefits of the dual-fuel system.
Safety and Performance
CNG is safer than many conventional fuels due to its non-toxic nature and narrow flammability range. It disperses quickly into the atmosphere in case of a leak and is equipped with an odorant for easy detection. The proven safety record of CNG makes it a superior choice for fleet operations.
Conclusion
With the cost of diesel fuel at R21.91 per litre and ongoing geopolitical tensions affecting oil prices, strategic fuel considerations are crucial. While the distribution network for CNG is currently limited to the Gauteng region, its environmental and operational benefits make it an ideal choice for municipalities and centralized refilling applications. The added tare mass of CNG cylinders and the need for chassis space make CNG-DDF conversions best suited for long-wheelbase models. ISUZU’s option for 20 long-wheelbase models offers significant advantages for fleet replacement planning, with tools like the TruckScience Axle Weight Calculator aiding in payload capacity calculations.
By embracing CNG-DDF technology, ISUZU is paving the way for a greener, more cost-effective future in the trucking industry.
