Compressed Natural Gas (CNG)
Heritage Gas offers natural gas delivery service by using CNG trucking. Through CNG transport, Heritage Gas enables large energy users that are currently outside our pipeline distribution network to realize the benefits of natural gas.
Trucking CNG to areas that do not have natural gas access allows businesses to remain competitive, reduce energy costs, and maintain jobs during times of economic distress through the utilization of an affordable source of energy.
Heritage Gas is a Nova Scotian leader in CNG distribution and currently provides natural gas through CNG delivery to two industrial customers.
To find out if CNG delivery can help your business, please call us at 1-877-836-7427.
Compressed Natural Gas (CNG) Q&A
1. What is CNG?
CNG remains clear, non-corrosive, and retains that unique “rotten egg” smell, an odorant that is added by Heritage Gas. This odor makes it easier to detect a leak.
2. How is CNG made?
CNG is then depressurized to normal “pipeline” operating pressures, so the natural gas can be consumed for manufacturing or space & water heating.
3. How is CNG stored and transported?
4. Is CNG safe?
Several factors contribute to CNG’s safety:
- Flammability/Explosiveness – CNG has a high ignition temperature of 649°C (1,200°F), compared to gasoline at 316°C (600°F). CNG has a narrow range of flammability, requiring a concentration ratio of 5% to 15% of CNG in air. The high ignition temperature and limited flammability range makes accidental combustion of CNG very unlikely.
- Detecting Leaks – In its natural state, natural gas is odourless. As a safety measure, the gas is odorized with a chemical agent called Mercaptan (rotten egg odor) to provide a ready means of leak detection.
- Non-Toxic – Natural gas has no known toxic or chronic physiological effects (it is not poisonous).
- Cylinder Strength – CNG cylinders are much stronger than gasoline tanks. The design of CNG cylinders is subject to a number of “severe abuse” tests such as heat and pressure extremes, gunfire, collisions and fire. The systems are also fitted with valves and other safety devices to monitor and control leakage.
- Lighter than Air – CNG is lighter than air. Unlike other fuels such as diesel, petrol or propane, which are heavier than air, CNG does not pool on the ground and does not create a fire hazard, potential soil contamination, or pollution to waterways. If a CNG leak were to occur, the gas will disperse rapidly upwards into the atmosphere and dissipate.
5. What are the risks from CNG truck transport?
To add some perspective, bear in mind that we fill our cars and trucks with gasoline and diesel and use liquid propane to heat our homes and light our BBQ grills hundreds of millions of times each day — and serious safety incidents are rare. These fuels are routinely transported over provincial roads and, again, safety and security incidents are rare.
6. What if a truck is in a road accident and CNG starts leaking?
In the extremely unlikely event that one tank would be breached as a result of an accident, leaking CNG would dissipate rapidly into the air rather than pool like liquid petroleum fuels. Plus, because of the narrow range of conditions needed to ignite CNG and natural gas, chances for ignition are low compared with petroleum fossil fuels. CNG has a high ignition temperature of 649°C (1,200°F), compared to gasoline’s 316°C (600°F), meaning it’s harder to ignite. CNG has a narrow range of flammability, requiring a concentration ratio of 5% to 15% in air, also making it harder to ignite. Together, the flotation/dissipation, high ignition temperature, and limited flammability range contribute to the safety of CNG.
Under the Transportation of Dangerous Goods regulations, Heritage Gas has an Emergency Response Assistance Plan in place with skilled professionals trained to respond quickly to any incident involving CNG delivery trucks 24 / 7.
7. How do you know if CNG starts leaking from a truck?
A high pressure leak is also quite noisy. Smell and sound are quite dependable leak detectors for CNG.
All operators of facilities and trailers are trained to recognize and respond to these indicators promptly and will have methane detectors as part of their standard equipment.