Forklifts using in Chemical Industries, Energy production, Sewage Disposal, Gas supply, Spray painting, Refineries, etc. Will need to have explosion proof function. So how to idenfy the grade in different areas?
Area Classification
Zone 1:
A place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapor or mist is likely to occur in normal operation occasionally.
Zone 2:
A place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of gas, vapor or mist is unlikely to occur in normal operation but if it does occur will persist for a short period only.
Zone 21:
A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur in normal operation occasionally.
Zone 22:
A place in which an explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but if it does occur will persist for a short period only.
Definitions for Zone 0 and Zone 20 are not shown as forklift trucks would not be allowed to operate in such areas.
Gas groups and Temperature Class
All trucks will be supplied to be suitable for Gas groups IIA and IIB and with temperature limitation to Class T.3 200 °C, unless otherwise specified.
Temperature Class:
T1 Maximum surface temperature 450 ℃
T2 Maximum surface temperature 300 ℃
T3 Maximum surface temperature 200 ℃
T4 Maximum surface temperature 135 ℃
T5 Maximum surface temperature 100 ℃
Note: the only material rated T5 is Carbon disulfide. T6 (85 ℃ is not applicable).
Gas Groups:
IIA Surface industry, representative gas Propane and Acetone.
IIC Surface industry, representative gas hydrogen.
Further information on the flashpoint, vapor density, flammability range, auto-ignition temperature and gas group of materials can be found in the relevant sections of Chinese standard GB3836.
