If the standard IEC 60079-10-1 is taken into consideration, hazardous area shall be classified as below;
ZONE 0 : In this zone, a flammable atmosphere is continuously present, or for long periods or frequently.
1000 <= 8760 hrs per year
ZONE 1: In this zone, a flammable atmosphere is likely to occur during normal operation occasionally.
10 <= 1000 hrs per year
ZONE 2 : In this zone, a flammable atmosphere is not likly to occur during normal operation, but if it does, its duration for a short period only.
0<= 10 hrs per year
Flammable Liquit Storage Tank:
a = 3 mt from vent openings
b = 3 mt above the roof
c = 3 mt horizontally from the tank