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[yaoliang5]

I will get loading data from each equipment, to design the flare system including piping, knock-out drum, flare stack, header and laterals. Could experienced people tell me the apporach step by step? please include how to evaluate the line pressure drop, maximun allowable back pressure, do we need flare simulation etc.

[Dacs]

You have to have API 520 and 521 as your reference in making your flare system.

In a grossly oversimplified manner, you need to establish the maximum relief loads from each source along with simultaneous relieving scenarios (such as loss of utilities like air/CW/electricty and fire).

Then you'd have to size your lines for the PSV to meet the minimum backpressure required for each PSV. You also need to consider noise and pipe Mach No in designing your network.

To give the details here will require a lot of typing on my part so I suggest to read the references above to start your design.

Normally, designing a flare system done by specialized software such as FlareNet. While I don't see any reason not to do this by hand, I just can't imagine how tedious this work might entail.

To add, there are some specific provisions for acid gas flare such as usage of certain materials (such as stainless steel) and the need for steam tracing for the network. I'd be happy to share it with you but I have to ask you to start doing the design first.

Good luck