Zone 0 :- Harmful & Toxic gases are always present in NORMAL conditions.
(Also known as Brown Field)
Example :- 30 meter radius of live flare
Zone 1 :- Harmful & Toxic gases are occasionally present in NORMAL conditions.
Zone 2 :- Harmful & Toxic gases are present in ABNORMAL conditions.
Example :- In case of live pipe rupture
Unclassified :- Area free from Harmful & Toxic gases
I hope, you understand about Zone Classification.
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HSE STUDY GUIDE