pressure safety valve

In what country are these PSVs you talking about?

In the USA and most other countries it is against the law to vent hydrocarbons or toxic fumes to atmosphere.

This is a way of economy via absence of piping if the process is " non-toxic ".

thanks freidun for your reply.

as you know, relieved compounds from PSV on top of atmospheric column are hydrocarbons which are flameable. so sending this compounds to atmosphere creates hazard area.

i have found that relieved fluid from this PSV can be eighter liquid phase or vapor phase. what's your idea in this regards?

Dear HD,

These are "process specific" operations. In old days this type flammable gases were forwarded to a stack and one let them burned at top of stack.

Nowadays i'm not sure the way is this and they could be reused with a purpose of "co-generation" process say with a steam boiler after some specific acquisition procedures.

I'm not a chemical engineer but electronics and i can speak on the basis of what i've seen at automation area.

regards