3 replies to this topic

[chinna praveen kumar]

please give me answer to my question, why the oil and water finding pasts area color changing with contact of oil and water and any chemical reaction is going on.?

[fallah]

Hi,

 

I don't know if the query isn't so clear or am not be able to understand...

[P.K.Rao]

Some water finding pastes have anhydrous cobalt chloride which changes color when it comes in contact with water because hydrated cobalt chloride is blue in color and anhydrous cobalt chloride is colorless. 

[Leopard_nett]

I had a question concerning zone selection in hazardous area classification:

 

in a plant, i it possible to have a a zone 0 directly covered by zone 2?

A better formulation here would be:  is a jump among zones is allowed?   that means for example having a zone 2 adjacent to zone 0?,   or a non-hazardous area directly adjacent to zone 1? 

 

Thanks in advance