What is Hazardous Area Classification
Zone 0, Zone 1,
Zone 2 System
Area classification is
a method of analyzing and classifying the environment where explosive gas
atmospheres may occur.
The main purpose is to
facilitate the proper selection and installation of apparatus to be used safely
in that environment, considering the properties of the flammable materials that
will be present.
In industries, it is crucial to understand and classify areas based on the
potential presence of hazardous substances to ensure the safety of workers and
prevent accidents.
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One common classification system used for this purpose is the zoning system, which divides a facility into different zones based on the likelihood of an explosive atmosphere being present.
The three main zones
are Zone 0, Zone 1, and Zone 2.
Zone 0 is the area where an explosive atmosphere is present continuously or for
long periods of time.
This zone is the most
hazardous and requires the highest level of protection for workers and
equipment.
Any equipment used in
Zone 0 must be specially designed and certified for use in such environments to
prevent the risk of ignition and subsequent explosion.
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Zone 1 is the area where an explosive atmosphere is likely to occur under
normal operating conditions.
Although the presence
of the explosive atmosphere in this zone is not as constant as in Zone 0, it is
still a high-risk area that requires precautions to be taken.
Equipment used in Zone
1 must be designed to prevent the ignition of hazardous substances and to
minimize the risk of explosion.
Zone 2 is the area where an explosive atmosphere is not likely to occur under
normal operating conditions but may occur occasionally due to abnormal
circumstances.
While the risk in Zone
2 is lower compared to Zone 0 and Zone 1, it is still important to take
precautions to prevent accidents.
Equipment used in Zone 2 must be designed to withstand the occurrence of an explosive atmosphere and to reduce the risk of ignition.
Proper zoning classification is essential for ensuring the safety of workers and preventing catastrophic accidents in industrial settings.
By understanding the
characteristics of each zone and implementing appropriate safety measures,
employers can create a safe working environment for their employees.
As per HSE UK, The most
common values used are:
- Zone 0: Explosive atmosphere for
more than 1000h/yr
- Zone 1: Explosive atmosphere for
more than 10, but less than 1000 h/yr
- Zone 2: Explosive atmosphere for
less than 10h/yr, but still sufficiently likely as to require controls
over ignition sources.
In conclusion, the zoning classification system of Zone 0, Zone 1, and Zone 2 plays a critical role in identifying areas with potential hazards and implementing necessary safety precautions.
By categorizing
industrial facilities into these zones and using equipment certified for use in
hazardous environments, employers can protect their workers and prevent
accidents.
It is important for all
personnel working in such areas to be aware of the zoning classification and
adhere to safety protocols to ensure a safe work environment for all.
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