What pipe type should not be buried underground?

The choice of pipe type for underground installation is crucial due to various factors, including material properties, corrosion resistance, and the environment in which the pipe will be placed. BI pipes, or buried iron pipes, are generally not recommended for underground use due to their susceptibility to corrosion when exposed to moisture and soil conditions. Over time, this can lead to structural failure, leaks, and potential contamination of surrounding soil and water sources.

Polyethylene pipes, on the other hand, are designed for underground use as they are resistant to corrosion, lightweight, and flexible, allowing for easier installation and adaptability to ground movement. Galvanized iron (GI) pipes can also be used underground but may require additional protective coatings to mitigate corrosion, making them less ideal than polyethylene options.

Therefore, the conclusion that BI pipes should not be buried underground is based on their vulnerability to corrosion, which could compromise the integrity and functionality of an underground piping system.