Underground fire main installation refers to the furnishing and installation of underground piping systems that deliver water from a municipal supply, fire pump, or storage source to a building’s fire protection systems—such as fire sprinkler systems, standpipes, and fire hydrants. These mains form the primary backbone of a property’s fire protection water supply.
When performing underground fire main installations, S&S Midwest Fire Protection will:
- Excavate, lay, and backfill underground fire-rated piping (typically ductile iron or approved HDPE).
- Install appurtenances such as gate valves, indicator posts (PIVs), hydrants, tees, restraints, thrust blocks, fittings, and
transitions to aboveground systems. - Provide flushing, hydrostatic testing, and disinfection as required by codes and local jurisdictions.
- Coordinate with civil contractors, utility providers, and the authorities having jurisdiction (AHJ)
- Ensure all work complies with NFPA 24 and applicable local standards.
Characteristics & Benefits:
Primary water supply pathway
Connects the source to all downstream fire protection systems.
Buried and protected
Installed underground to ensure reliability, freeze protection, and physical protection.
Highly regulated
Must meet strict requirements for depth, materials, joint restraint, valve placement, and testing.
Supports hydrants and building systems
Supplies both site fire hydrants and interior suppression systems.