pocket in flare header

Flare headers shall be free draining towards knock out drum
without any pocket, this was my concept till yesterday..!
In a new project i am working on a unit flare header is tapped to main header
unit flare header is at 6 mtr. tier & main header is at 10 mtr. tier. The vertical leg at battery limit
is having a drip leg kind of arrangement.

I raised this issue with my boss and he told me that process people has no objection
to it.
My question is .. How is it possible..??

Dear Jop,
This is a greenfield power project in SA using coal gasification technology.
The unit i have been assigned to is called "Rectisol" in which impure gas is purified (H2s, Co2, HCN recovery) using
methanol as a solvent.
Size of main header is 24".
Size of unit header is 8".
Unit flare header (8") is sloped and supported outside the rack on cantilever. WP. EL. of unit header at B/L is approx. 6 mtr. At B/L it is raised vertically upward and tapped at 45^ to the main header (24") which is at 10 mtr. level.

At B/L vertical leg of approx 4 mtr. is provided with a drip leg and drain is routed to U/G system.

I hope this clarifies the situation. (No comments about the Boss..!! )

Your resolution is no doubt the best possible way to do it sir,
But i was told to route drain of the unit header to U/G slope methanol
System and I wonder how it would work..? Since their is no KO drum in this perticular unit.

I have had this problem from time to time. Jop's method of a secondary KO Drum is best and safest and should be the first choice.
I have however had to install a drain and barrel/pot at the low point. When I first encountered this I challenged the process engineer as I thought this was an unsafe practise. He said it was allowed according to code (API 520 Part II Section 6 - Installation Conditions that require Drain Piping) but it must be written into the operating procedures so that the plant operator can drain the line frequently. This of course requires client approval as it places responsibility and onus on their operations for safety.