Is the electrical explosion-proof level in a dry gas environment containing hydrogen (20% volume) DIIBT4 or DIICT4?
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Is the electrical explosion-proof level in a dry gas environment containing hydrogen (20% volume) DIIBT4 or DIICT4?
It should be IICT4:handshake
So due to the presence of dry gas, does the electrical explosion-proof level of the electrical equipment of the heavy catalyst device need to be set as IICT4?
Dry gas is used as high-pressure gas in the refinery and is useful in the entire plant. So the explosion-proof level of the refinery should be increased to CT4?
The main component of dry gas is methane. According to the example of grouping of gas or steam explosive mixtures in Appendix 3 of the Design Code for Explosive and Fire Electrical Installations, methane is Class II A and the group is T2. The relative is IIC and the group is T1. Then the explosion-proof level of the explosion-proof electrical appliance is higher than IIC T2.
Area 1 or Area 0 where hydrogen exists should be IICT1
It should be DIICT4, the minimum spark energy is 0.019mJ
The classification of hydrogen is IIC and the grouping is T1. If it is explosion-proof, it should be at the highest level. However, hydrogen has a characteristic that it is easy to accumulate on the roof and form explosive gas. DIICT6 can be considered for the explosion-proof electrical facilities on the top floor of the equipment, which can reduce investment. The words of one family are just for reference.