Is CNG safe for use in vehicles?

Yes. It’s a common misperception that the high-pressure storage of CNG makes it more hazardous than other fuels. The truth is, CNG fuel cylinders are significantly stronger than gasoline tanks. These fuel tanks are up to a half-inch thick and are made of steel or a composite designed to be stronger than steel and the valves are designed to protect the closed system and perform under the high pressure.

Leaks may also be on your mind. But, the truth is a natural gas leak is safer than any other motor fuel leak because it doesn’t pool on the ground like LPG, diesel, or gasoline. That’s because natural gas is lighter than air and will disperse quickly.

CNG also has a high ignition temperature, about 1,200 degrees Fahrenheit compared to about 600 degrees Fahrenheit for gasoline. And, it will only burn if it mixes with air and makes up exactly 5 to 15% of the composition. At less than 5% concentration, it will be too thin to burn. At more than 15%, there won’t be enough oxygen for it to burn. The high ignition temperature and limited flammability range make accidental combustion of CNG unlikely.

For even more information, we recommend watching this short video created by CNG Now, “The Safety of Compressed Natural Gas.

What is RNG?

Renewable natural gas (RNG), or biomethane, is a pipeline-quality gas that is fully interchangeable with conventional natural gas and thus can be used in natural gas vehicles. RNG is essentially biogas (the gaseous product of the decomposition of organic matter) that has been processed to purity standards. At ANG, we’re on target to source 100% of our natural gas from renewable sources before 2020. Fleets fueling with RNG can achieve near-zero carbon footprints.

How does RNG work?

As organic waste breaks down at local landfills, wastewater treatment plants, commercial food waste facilities, and agricultural digesters, it emits methane biogas. Methane is a powerful greenhouse gas that traps heat in the atmosphere, yet it’s often left to disperse into the air of our local communities.

To reduce greenhouse gas emissions and create a world with cleaner air, our industry has found a way to capture, clean, and convert the methane into Renewable Natural Gas (RNG). RNG is injected into the existing natural gas grid and dispensed to fleets at our CNG stations. Because it can be used interchangeably with conventional natural gas, fleets don’t have to make any operational changes or additional investments to fuel with RNG.

What’s the difference between biogas, biomethane, and renewable natural gas?
  • Biogas = a mixture of carbon dioxide and hydrocarbons, primarily methane gas, from the biological decomposition of organic materials
  • Biomethane = a biogas-derived, high BTU gas that is predominately methane after the biogas is upgraded to remove contaminants
  • Renewable Natural Gas = is biomethane upgraded to natural gas pipeline-quality standards so it can substitute or blend with conventional natural gas
If I use RNG, will it cost more than CNG?

No! RNG is CNG that comes from a renewable source. Switching to RNG is effortless and requires no additional capital or investment from fleets already using CNG.

How do vehicles perform on CNG?

There have been significant advances in CNG technology since its first introduction to the transportation industry. Today, natural gas vehicles run similar to gasoline or diesel vehicles with regard to power, acceleration, and cruising speed. Driving range is still slightly less than that of comparable gasoline and diesel vehicles; however, new designs include extra storage tanks which increase the range of larger vehicles.

In a recent case study done by Clean Cities and the U.S. Department of Energy, a company that had converted its fleet to CNG asked its drivers for feedback. One of the comments shared was, “Quiet, lots of power – plenty of power. There’s just no comparing one of these – a CNG truck to a diesel truck. I feel great about working for a company that’s gone CNG.”

Will my drivers notice a difference with a CNG vehicle?

Yes. For the better. Because CNG vehicles run cleaner, drivers have reported feeling healthier and having more energy because they no longer spend the day in diesel fumes. CNG vehicles are also safer, meaning drivers have more confidence getting behind the wheel. And, because CNG vehicles run quieter, drivers express an overall more enjoyable ride.

In a recent case study conducted by Clean Cities and the U.S. Department of Energy, an executive at a company that had converted its trucks to CNG said, “Drivers absolutely love the trucks. They love the fact that they no longer have to wear earplugs at work. They love the fact that the trucks are efficient. They don’t break down as often as their old diesels.”

And if CNG is new to your fleet, rest assured that our team will be by your side. We’ll work one-on-one with your fleet managers, trainers, technicians, safety coordinators, and drivers to make sure everyone feels comfortable, safe, and secure.

Is it easy to fuel a vehicle with CNG?

Yes. CNG vehicles are fueled with easy-to-use, pressure-sealed dispensers.

All of ANG’s stations are “fast-fill”. With high-pressure cylinders, we’re able to hold a large amount of fuel on site so you can experience a traditional fueling experience. At our stations, CNG is transferred to your vehicle in a matter of minutes.

In some instances, “time-fill” may be available. Time-fill stations compress the natural gas and distribute it directly to your vehicle’s onboard storage rather than storing it on site. This model is most often used for return-to-base fleets that park overnight and can fuel at a consistent time.

Will I save money running my fleet on CNG?

Yes. Historically, the average retail price of natural gas has been lower than the price of gasoline and diesel. And, even as diesel and gasoline prices drop, they remain unpredictable and unstable while natural gas is more consistent. Incentives are also available to reduce the cost of converting to or operating NGVs. At ANG, we offer a competitive fuel savings program so you can get the best value for your entire fleet.

Where can I find the closest CNG station to me?

Please visit our Station Map to find the closest ANG station to you. You can also visit the U.S. Department of Energy’s Alternative Fuels Data Center to search by zip code and even plan a route.

Are there tax credits, grants or incentives available to convert to CNG?

Our team closely monitors the latest funding opportunities available and is always analyzing the best options for our customers. If we determine there is a credit available and if your conversion qualifies, we’ll do what we can to help you benefit from it.

How do CNG emissions compare with gasoline and diesel vehicle emissions?

Compared with gasoline and diesel vehicles, those running on CNG can produce significantly lower carbon monoxide, nitrogen oxide, nonmethane hydrocarbon, particulate matter, and other toxic emissions, as well as greenhouse gas emissions. CNG fuel systems are also completely sealed, which means CNG vehicles produce no evaporative emissions. (Alternative Fuels Data Center, USDOE)

Aren’t gas prices going down?

Yes, oil prices have decreased in recent years. But they’ve also spiked multiple times in the same time period. Truth is, oil prices are unpredictable. With fuel being the largest operating expense of running a heavy duty truck (up to 40%), it’s becoming increasing difficult to maintain budgets.

And, as the chart from the American Gas Association shows, projections show that gasoline and diesel will remain more expensive than natural gas.

Where can I look for more information on CNG?

There are a number of government-sponsored and private research groups dedicated to educating business owners and individuals on CNG. You can always start by contacting us, but you may also be interested in some of these resources:

• U.S. Energy Information Administration

• Natural Gas Vehicles for America

• American Gas Association

• Northeast Gas Association

• USDOE Alternative Fuel Data Center/Natural Gas

• USDOE Clean Cities Program


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