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Fire Detection Systems

Fire detection: Design Logic

The design of a smoke detection complies with the UNI 9795 Standard “Fixed automatic fire detection and alarm signals” (2013), the “Installation and construction Standards for automatic fire detection systems”, the UNI EN 54 and the EN 60849 (CEI 100-55) Standard – Electroacoustic systems applied to emergency services.

Depending on the application field, also the following regulations applying to specific sectors must be observed:

  • MD 22/2/2006 for offices
  • MD 18/9/2002 for hospitals
  • MD 19/8/1996 for halls used for public shows
  • MD 6/6/2005 for sport facilities
  • P.D. 30/06/1995 for libraries and archives
  • MD 14/7/2015 for hotels
  • MD 21/3/2018 for schools
  • MD 9/5/2007 for museums and exhibitions
  • MD 21/2/2017 for garages
  • MD 11/9/2010 for department stores and businesses
  • MD 21/10/2015 for subways
  • MD 28/2/2014 for camping places and touristic villages
  • DCPREV Note, file no. 1324 of 7/2/2012 for photovoltaic systems
  • MD 13/7/2011 for generator sets
  • K.D. 6/5/1940, no 635 for explosive environments
  • MD 31/7/1934 for mineral oil
  • Circular letter no. 74 of 20/09/1956 for storage areas for LPG tanks
  • MD 14/5/2004 for LPG deposits
  • PD no. 340 of 24/10/2003 for street GPL stations
  • MD 28/06/2002 for street methane gas stations
Purpose of a fire detection system

Fixed, automatic fire detection systems rapidly detect and signal fires. Fixed, manual signaling  systems emit a signal only after a fire has been detected by somebody. In both cases the fire signal is transmitted and visualized at a central/signaling control unit and possibly re-transmitted to a video surveillance central unit. Quick fire detection may save the life of many people and therefore correct design of fire systems is crucial.

The purposes of a fire detection system can be summarized as follows:

  • Detecting a possible fire as soon as possible
  • Helping evacuating people and removing objects as soon as possible
  • Implementing intervention plans
  • Introducing fire protection systems and other possible safety measures
Fire detection: Project elements
  • Addressable, analog fire detection central units, complete with batteries, in compliance with the UNI EN 54-2 Standard
  • Optical smoke detectors for standard rooms or thermo-speed detectors, in compliance with the UNI EN 54-7 Standard
  • Optical detectors/Linear detectors
  • Detectors for air ducts (on supply and return ducts), capable of stopping the ventilators of the air treatment units.
  • Signal repeaters for detectors installed in suspended ceilings and unattended rooms
  • Heat sensitive cables
  • Air suction and sampling systems
  • Alarm repetition panels
  • Optical and acoustic signaling devices
  • Manual alarm buttons
  • GSM module for remote transmission of failure and alarm signals; ethernet interface module
  • Electromagnets for releasing safety doors
Detection systems

The detection system must lead to the automatic activation of the following functions:

  • Automatic closure of the fire doors,  normally kept open, located in the fire-fighting area from which the signal has originated, by means of the closure devices.
  • Electrical deactivation of ventilation and/or air conditioning systems.
  • Closure of fire dampers located in the channeling of the ventilation and/or air conditioning systems in the area from which the signal has originated.
  • Remote transmission of the alarm signals to the locations pre-established in an internal emergency plan.

In all cases of crowded or high-risk places, emergency vocal alert systems  compliant with the UNI ISO7240 and the CEI EN 60849 Standard are provided; the people present are warned about the presence of hazards requiring  safe and controlled evacuation.

In view of the above, the smoke detection central unit is provided with an interface with the acoustic (loud speakers) evacuation system through a dedicated output. The sound diffusion system for emergency voice alert has a very important function: managing the evacuation of the whole building or part of it in the case of hazards and/or alarms in compliance with a plan established in agreement with the Head of Prevention and Protection of the organization.

The sound diffusion system for emergency voice alert consists of the following:

  • rack cabinet for managing the system. This includes the central units in compliance with the EN 54-16 Standards. Central units are provided with an integrated MP3 player, two outputs (line A and line B) for each amplifier, LCD display, integrated alarm message player, 230 VAc power supply with EN 54-04 internal rescuer and batteries capable of guaranteeing 24 hour operation in the standby mode and more than 30 minutes full operation in the case of power failure
  • Microphone in attended reception areas
  • Buttons for the activation of a pre-recorded emergency voice alert, complementing  each individual microphone point
  • Acoustic diffusors in compliance with the EN 54-24 Standard

A fire extinguisher system is installed inside technical rooms or particularly critical areas. The system is managed, controlled and interfaced with the fire alarm by independent interlocking in each individual room.  The system consists of the following:

  • Supervision central unit in compliance with the EN 12094-1:2004 Standard, control, command, signaling and management of the UDS-3N type.
  • Conventional buttons for activating/deactivating the switching off system in the case of glass breakage, yellow and blue colour, protection degree IP67
  • Wall key control with 2 positions for inhibiting the switching off system for maintenance purposes. Colour:  blue
  • Optical/acoustic panels with wall fixing bracket for internal signaling in the room, complete with polycarbonate film with the following writing “EVACUATE THE ROOM” and “KEEP OUT – SHUTDOWN IN PROGRESS”
  • Conventional, optical smoke detectors

Depending on the specifications, on the rooms to be protected and on their content, we offer the following systems:

  • Powder systems in compliance with the UNI EN 12416-2 Standard. They make it possible to rapidly extinguish fires using liquid or gaseous substances in areas where petrol is stored and boilers, LPG etc. can be found
  • Water systems, in compliance with the UNI 10779:2014 Standard for any situation
  • Gas systems, in compliance with the UNI-EN 15004 Standard. This could be, for example, CO2, Novec 1230, FM-200, Halotron, NAF S 125, Inergen for critical rooms such as vaults, central units, data processing centres, archives, substations, UPS rooms, battery rooms
  • Foam systems, in compliance with the UNI EN 13565-1:2008 Standard for very dangerous contexts such as petrochemical systems, refineries, offshore platforms and systems for the production of energy.
Fire Detection Systems
The detection system must lead to the automatic activation of the following functions:

  • Automatic closure of the fire doors,  normally kept open, located in the fire-fighting area from which the signal has originated, by means of the closure devices.
  • Electrical deactivation of ventilation and/or air conditioning systems.
  • Closure of fire dampers located in the channeling of the ventilation and/or air conditioning systems in the area from which the signal has originated.
  • Remote transmission of the alarm signals to the locations pre-established in an internal emergency plan.

In all cases of crowded or high-risk places, emergency vocal alert systems  compliant with the UNI ISO7240 and the CEI EN 60849 Standard are provided; the people present are warned about the presence of hazards requiring  safe and controlled evacuation.

In view of the above, the smoke detection central unit is provided with an interface with the acoustic (loud speakers) evacuation system through a dedicated output. The sound diffusion system for emergency voice alert has a very important function: managing the evacuation of the whole building or part of it in the case of hazards and/or alarms in compliance with a plan established in agreement with the Head of Prevention and Protection of the organization.

The sound diffusion system for emergency voice alert consists of the following:

  • rack cabinet for managing the system. This includes the central units in compliance with the EN 54-16 Standards. Central units are provided with an integrated MP3 player, two outputs (line A and line B) for each amplifier, LCD display, integrated alarm message player, 230 VAc power supply with EN 54-04 internal rescuer and batteries capable of guaranteeing 24 hour operation in the standby mode and more than 30 minutes full operation in the case of power failure
  • Microphone in attended reception areas
  • Buttons for the activation of a pre-recorded emergency voice alert, complementing  each individual microphone point
  • Acoustic diffusors in compliance with the EN 54-24 Standard

A fire extinguisher system is installed inside technical rooms or particularly critical areas. The system is managed, controlled and interfaced with the fire alarm by independent interlocking in each individual room.  The system consists of the following:

  • Supervision central unit in compliance with the EN 12094-1:2004 Standard, control, command, signaling and management of the UDS-3N type.
  • Conventional buttons for activating/deactivating the switching off system in the case of glass breakage, yellow and blue colour, protection degree IP67
  • Wall key control with 2 positions for inhibiting the switching off system for maintenance purposes. Colour:  blue
  • Optical/acoustic panels with wall fixing bracket for internal signaling in the room, complete with polycarbonate film with the following writing “EVACUATE THE ROOM” and “KEEP OUT – SHUTDOWN IN PROGRESS”
  • Conventional, optical smoke detectors

Depending on the specifications, on the rooms to be protected and on their content, we offer the following systems:

  • Powder systems in compliance with the UNI EN 12416-2 Standard. They make it possible to rapidly extinguish fires using liquid or gaseous substances in areas where petrol is stored and boilers, LPG etc. can be found
  • Water systems, in compliance with the UNI 10779:2014 Standard for any situation
  • Gas systems, in compliance with the UNI-EN 15004 Standard. This could be, for example, CO2, Novec 1230, FM-200, Halotron, NAF S 125, Inergen for critical rooms such as vaults, central units, data processing centres, archives, substations, UPS rooms, battery rooms
  • Foam systems, in compliance with the UNI EN 13565-1:2008 Standard for very dangerous contexts such as petrochemical systems, refineries, offshore platforms and systems for the production of energy.