What type of pipe is commonly used for underground fire mains?

Steel pipe is commonly used for underground fire mains due to its durability and strength. Fire mains must withstand high pressures, which makes the robust nature of steel a suitable choice. It is resistant to the physical forces that may occur underground, such as soil movement and heavy loads from above, ensuring the integrity of the system over time.

Additionally, steel pipe can be effectively welded or mechanically joined, allowing for secure connections that are essential in fire protection systems. Its ability to withstand external corrosion can be improved with protective coatings or additional materials when installed underground. This makes steel a more reliable option compared to alternatives, especially in areas where the risk of mechanical damage or ground movement is a concern.

While PVC and copper pipes have specific applications in plumbing, they do not meet the rigorous demands typically associated with underground fire mains. Galvanized pipe, although sometimes used in other applications, may not offer the same level of reliability and durability under high-pressure conditions as steel does. Therefore, steel pipe is the preferred material for this critical infrastructure component in fire protection systems.