What is the maximum vertical distance above the pipe required for pipe backfill?

The correct answer highlights the maximum vertical distance of 2 feet above the pipe that is typically required for pipe backfill in sprinkler fitting applications. Maintaining this distance is crucial for several reasons. It ensures that the pipe is adequately protected from external pressures and loads that may occur from soil settling or above-ground activities. Too much backfill over the pipe can lead to excessive weight, potentially causing damage or misalignment of the pipe.

Additionally, the specified distance helps to provide sufficient cover for the pipe, safeguarding it from environmental elements like frost penetration in colder climates. This is particularly important in Minnesota, where soil freezing can be a concern during winter months. By adhering to the recommendation of 2 feet, practitioners create a balance between ensuring the pipe is buried deep enough for protection while avoiding the risks associated with excessive backfill.