What must underground piping be protected against?

Underground piping must be protected against damage, corrosion, and stress on the pipe to ensure its longevity, safety, and operational integrity. Since these pipes are buried underground, they can be subjected to various external forces and environmental conditions. Damage can occur from accidental impacts, digging activities, or shifting soil, which can compromise the integrity of the piping.

Corrosion is a significant concern for any buried metal piping, primarily due to moisture in the soil and electrolytic reactions that can break down the metal over time. Protective measures such as coatings, cathodic protection systems, and careful material selection are crucial to mitigate corrosion risks.

Stress on the pipe can result from external forces such as soil movement or settling. Proper installation techniques and the use of suitable materials help ensure that the pipes can withstand these stresses without failure.

Together, these factors encompass the essential aspects of underground piping protection, making this answer comprehensive regarding the requirements outlined in the NFPA 58 code.