What is the maximum distance for a gas pipe run before needing a larger diameter?

The correct answer indicates that a gas pipe run may need a larger diameter if the length exceeds 50 feet. This is based on principles of gas flow and pressure drop within the piping system. As the distance of the gas run increases, the resistance to gas flow due to friction also increases. If the pipe diameter remains constant and the distance is too long, the pressure at the end of the line may drop to unacceptable levels, compromising the system's performance and safety.

Using larger diameter pipes reduces the resistance to flow, allowing adequate gas supply to reach appliances even at longer distances. Proper sizing is crucial to ensure that there is sufficient gas pressure and volume at the point of use, helping to prevent issues such as incomplete combustion or gas supply interruptions.

This understanding is essential for designing efficient and effective gas piping systems that meet safety standards and operational requirements.