What must be done if venting CNG to the atmosphere?

When venting compressed natural gas (CNG) to the atmosphere, it is essential to use a vent pipe or stack. This practice is critical for several reasons. First, venting through a designated vent pipe or stack helps safely direct the gas away from any potential ignition sources and minimizes the risk of accumulation in enclosed spaces. This is crucial since CNG is lighter than air and can disperse quickly if vented properly, reducing the risk of fire or explosion.

Additionally, utilizing a vent pipe or stack facilitates compliance with safety regulations and environmental standards. Proper venting ensures that the gas is released safely and effectively into the atmosphere without posing a danger to people, property, or the environment.

In contrast, venting in a confined space could lead to dangerous conditions, as the gas may concentrate and create an explosive atmosphere. Checking the fuel gauge or performing a vehicle inspection does not directly relate to the safe venting of CNG and is not a step involved in this process.