What is the minimum depth of underground piping required to be installed under railroad tracks?

The minimum depth of underground piping required to be installed under railroad tracks is typically set to ensure that the piping is adequately protected from the weight and pressure exerted by passing trains. A depth of 4 feet is specified because it provides a sufficient buffer to mitigate damage from surface loads, prevent disruption from potential changes in the ground, and protect the piping from freezing in colder climates.

Installing the piping at this depth helps to ensure the integrity and reliability of the fire suppression system, as it minimizes the risk of mechanical impact and environmental factors that could lead to leaks or failures. Furthermore, proper depth installation is crucial to meet safety regulations and codes that govern infrastructure near railroad operations, ensuring both the integrity of the fire protection system and the safety of rail operations.