Fire Protection System

Fire protection in buildings is usually split into two groups. Active fire protection takes action when a fire happens: detecting it, sounding the alarm, or discharging water or another extinguishing agent. Passive fire protection is built into the structure and works without being triggered, by keeping fire and smoke contained to the area where they started.

Buildings need both. Sprinklers control a fire, but fire-rated walls, floors and doors are what hold fire and smoke in one compartment long enough for people to get out and for firefighters to arrive.

A commercial building usually has several of these systems working together:

• Fire detection and alarm: smoke and heat detectors, manual pull stations, the fire alarm control panel, and horns, strobes or voice notification. Covered by NFPA 72.
• Water-based suppression: wet pipe, dry pipe, preaction and deluge sprinkler systems, plus standpipes and fire pumps. Sprinkler installation is covered by NFPA 13.
• Special suppression: clean agent systems for data and electrical rooms, kitchen hood suppression, and foam systems for fuel hazards.
• Portable fire extinguishers, covered by NFPA 10.
• Smoke control: stair pressurization, smoke exhaust fans and smoke dampers that limit how far smoke spreads.
• Passive protection: fire-rated walls and floors, fire doors, fire dampers in ductwork, and firestopping around pipe and cable penetrations.

In a typical commercial building, a smoke detector or a sprinkler water flow switch sends a signal to the fire alarm control panel. The panel sounds the alarm throughout the building and sends a signal to a monitoring station, which dispatches the fire department.

The panel also triggers other building systems. Elevators recall to a designated floor, smoke dampers and combination fire/smoke dampers close, air handlers shut down or switch to smoke control mode, and electrically locked doors on exit routes unlock. Sprinkler heads open individually when the heat at that head reaches its temperature rating, so in most fires a small number of heads near the fire discharge water.

Fire protection systems must be inspected, tested and maintained on a fixed schedule, and the results must be documented for the authority having jurisdiction (AHJ), usually the fire marshal, and for the insurer. Requirements for water-based systems such as sprinklers, standpipes and fire pumps are in NFPA 25. Fire alarm testing is covered by NFPA 72, and extinguisher inspection and maintenance by NFPA 10. Typical tasks include:

• Visual checks of control valves, gauges and sprinkler heads
• Fire pump test runs
• Main drain and water flow alarm tests
• Functional tests of detectors, pull stations and notification devices
• Monthly visual checks and annual maintenance of portable extinguishers
• Internal inspections of sprinkler piping for corrosion and obstructions
• Inspection of fire doors and fire dampers

Impairments matter as much as routine tests. When part of a system is out of service, jurisdictions and insurers expect an impairment procedure, which can include notifying the fire department and setting up a fire watch until the system is restored.

For each building, teams typically keep the locations of the fire alarm panel and sprinkler risers, device lists, inspection and test reports, deficiency and repair records, impairment logs, hydraulic calculations and as-built drawings. Fire marshals and insurers ask for this paperwork during inspections, so it needs to be complete and easy to find.

In a digital twin such as Syyclops, fire protection equipment can be located in the building model with its work orders and maintenance history attached, and compliance reports can be generated from that same data.