Fire Alarm Systems
In accordance with the terminology of the new National Fire Prevention Rules adopted in Regulation 28/2011 (6th September) BM: automatic fire detection and alarm devices as well as automatic integrated fire-fighting devices.
The availability of properly designed and implemented fire alarm systems is particularly important in explosive zones and atmospheres. Only fire alarm devices applicable in the given zones may be used in certain explosive zones.
The installed automatic fire-extinguishing systems closely relate to the fire alarm systems. Therefore the relating design work is a complex activity demanding a comprehensive approach.
The fire alarm systems used in explosive atmospheres include applications where additional requirements specific to the given area must be also taken into consideration during planning e.g.:
+ Refinery area
+ Tank parks
+ Power plant zone
+ Base plants
+ Pumping areas
+ Propane butane filling stations
+ Fuel filling stations
+ Road and railway gas product loading and unloading plants
Basic components of the fire alarm equipment:
+ Fire alarm centre
+ Manual alarm devices
+ Automatic detectors
+ Communications (wired, wireless)
+ Acoustic alarms
+ Light signals
+ Transmission accessories
+ Power supply (basic, reserve)
The individual facilities are classified into fire hazard groups (A, B, C, D, E). The type of the applicable (required) fire-extinguishing devices depends on the classification. (Dry powder, foam extinguishers, water mist extinguishers, sprinkler systems etc.)
The operations of the automatic fire alarm and fire extinguishing devices closely correlate to each other. Therefore they must be handled as closely correlated systems and with the same approach. During the work, several related standards containing information not included in the National Fire Prevention Rules must be taken into consideration. E.g. gas extinguishing systems must be installed and serviced in accordance with Standard MSZ EN 15004-1 in Hungary.
Fire prevention is a complex field reaching far beyond the direct fire alarm and fire extinguishing system components. Proper gravitational or forced (mechanical) smoke deflection must be provided (e.g. with properly dimensioned dome-lights). Fire division closures must be designed that must be provided with special sealing if necessary (e.g. at cable passages).
The fire prevention devices must be periodically inspected and controlled for their operation during their lifetime. The supervision for fire prevention standard is performed strictly within a regulated framework. Frequency of the supervision: every 6 years, and – in the case of highly flammable and explosive or flammable or explosive rooms and open spaces – every 3 years.