How to decide flare header size

[TexasHomeless]

Dear friends,
I have a question about flare sizing. Below is my understanding, but I am not sure, since I cant find related standards, API recommdation.

(1)For non fire case, decide what is the worst case(i.e. Max flow) , and decide header size. The worst case could be a major reactor upset or plantwide power failure. Am I right?

(2) For fire case, conseder all equipment( vessel, reactor) caught on fire, and decide the relief capacity?

Thank you very much~

 

[Idontknowit]

Hi Texashomeless

To size flare system you should look through API 521 first of all.

API 537 is useful 'Flare details for refinery and petrochemical service'

regarding relief rate: you shall consider all possible relief scenarios and then compare to choose the worst one.

Good luck

Idontknowit

 

[TexasHomeless]

Thanks, I will take a look