What is the minimum size of a dirt pocket diameter required for gas piping?

The minimum size of a dirt pocket diameter required for gas piping is specified to be twice the diameter of the pipe, but with an upper limit of 2 inches NPS (Nominal Pipe Size). This guideline is important to ensure proper drainage and to prevent any accumulation of sediment or debris that could hinder the performance of the gas piping system.

A dirt pocket serves as a collection area for any particles, moisture, or sediment that may enter the piping system. By having a diameter that is twice that of the pipe, there is ample space for any contaminants to settle without risking blockage of the line. The limitation of a maximum of 2 inches NPS prevents excessively large dirt pockets that could complicate maintenance procedures or take up unnecessary space.

In practical terms, this ensures both efficiency and safety in gas distribution systems, providing a balance between adequate drainage and manageable infrastructure.