photo of a fire protection technician performing an inspection

Special Hazards Fire Suppression System Test and Inspection Services

All of the services ASSI performs are in accordance with the latest NFPA standards.

Special Hazard fire protection encompasses gaseous agents, clean agents, inert gases, water based, large dry chemical systems and more.

General Inspection Scope for Special Hazards Fire Protection

Clean Agent Systems: NFPA 2001, NFPA 12A

Fire Extinguishers: NFPA 10

Water Mist Systems: NFPA 25, NFPA 750

Fire Alarm Systems: NFPA 72

Dry Chemical/CO2: NFPA 17


  • Check the hazard area to determine if any changes have been made.
  • Check to determine if the tamper indicators are in place and if the systems have been tampered with.
  • Check the entire system for mechanical damage.
  • Disconnect the control head or pneumatic tubing from the agent cylinders.
  • Remove the cartridge from the control head and exercise the control head to ensure that it is functioning properly.
  • Check that the remote pull station is operating properly.
  • Conduct a visual inspection to determine that there is no damage to the detector or buildup of foreign debris.
  • Reinstall the cartridge and replace the control head cover and tamper indicator.
  • Inspect the cylinder pressure. Tap the gauge lightly to ensure that the needle is moving freely and has the correct operating pressure.
  • Determine if the nozzle blow-off caps are intact and undamaged and replace if necessary.
  • A detailed inspection report identifying that the system is in compliance and operational will be provided.
  • Affix a weather protected tag with a wire to the system identifying all required items per NFPA 17 and state and local codes.


  • Inspect as per the six month maintenance instructions above.
  • An operational/functional test of the detection system will be provided in accordance with the manufacturer’s instructions.
  • Disconnect the discharge piping from the agent cylinder.
  • Using compressed air or dry nitrogen, blow out the discharge piping and replace all nozzle caps.
  • Remove the cylinder to verify the fill weight.
  • Replace the carbon dioxide check.
  • Document our findings.

ASSI performs Special Hazards Fire Protection System Test and Inspections Services throughout the New England States of Massachusetts, New Hampshire, Rhode Island, Connecticut, Maine and Vermont