What is the classification of hazardous area?

What is the classification of hazardous area?

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.

What is gas group IIA IIB IIC?

– Group IIA—Atmospheres containing propane, or gases and vapors of equivalent hazard. – Group IIB—Atmospheres containing ethylene, or gases and vapors of equivalent hazard. – Group IIC—Atmospheres containing acetylene or hydrogen, or gases and vapors of equivalent hazard.

What is gas group IIB H2?

With gas mixtures, the gas group should be considered as IIC or IIB+H2 where a gas mixture includes 30 % or more of hydrogen by volume unless other specific data is available. The temperature class should be taken as the lowest ignition temperature for any gas exceeding 3 % in the mixture.

What are the 3 zone classification?

For gases, vapours and mists the zone classifications are recognised as Zone 0, Zone 1 and Zone 2 areas.

Is IIB better than IIA?

Gases in Gas Group IIA require a higher ignition energy than Gas Group IIB. Gases in Gas Group IIC require the lowest ignition energy to ignite. Certifying your product for Gas Group IIA & IIB is usually sufficient to cover 98% of the market.

What is ex D classification?

> Flameproof « Ex d » equipment Contain an internal explosion without permanent distortions. • Guarantee that the explosion cannot be transmitted to the surrounding atmosphere. • Have a temperature at any points on the surface that is lower than the self ignition temperature of the surrounding gases or vapors.

What is the difference between Zone 21 and Zone 22?

In a hazardous dust environment, an ATEX Zone 21 is classified as an area that is classified ‘as a place in which an explosive atmosphere in the form of a cloud of combustible dust in the air is likely to occur occasionally during normal operation’ whereas an ATEX Zone 22 is classified as ‘a place in which an explosive …

Which is an example of group IIA gas?

Gas Groups

GAS GROUPS	TYPICAL GAS EXAMPLE
I	Firedamp (Methane) and coal dust
IIA	Petrol, Propane, Industrial Methane
IIB	Coke Oven Gasses, Ethylene
IIC	Acetylene, Carbon Disulphide, Hydrogen