What is the maximum diameter for threaded pipe used in fuel gas systems?

The maximum diameter for threaded pipe used in fuel gas systems is indeed 4 inches. This standard is set to ensure safety and efficiency in gas distribution within residential and commercial applications.

Utilizing larger threaded pipes can lead to complications, including difficulties in securing proper fittings and potential leaks. The standards surrounding fuel gas piping are designed to minimize the risk of leaks and ensure that gas is delivered safely to users. This limitation helps maintain a balance between adequate flow and manageable installation practices.

As such, adhering to this maximum diameter ensures that plumbers can effectively install and maintain systems without compromising safety or operability.