Why is Nitrogen used to push out gas?

Why is Nitrogen used to push out gas?

• A. It's used to cool the gas.
• B. It's an inert gas used to avoid gas-to-air mixture.
• C. It's used to increase gas pressure.
• D. It's used to react with oxygen

Answer: (B)

Nitrogen is used because it is inert and does not react with natural gas or with oxygen. When purging a line, you want to displace the gas and any air, creating a non-oxidizing environment so a potential leak cannot form a flammable or explosive gas–air mixture. Nitrogen accomplishes this safely, without cooling the gas, increasing pressure, or reacting with oxygen.

Nitrogen is used because it is inert and does not react with natural gas or with oxygen. When purging a line, you want to displace the gas and any air, creating a non-oxidizing environment so a potential leak cannot form a flammable or explosive gas–air mixture. Nitrogen accomplishes this safely, without cooling the gas, increasing pressure, or reacting with oxygen.