What are the components and design considerations for a flare system?

Flare system components: Collection system - headers from relief valves (separate hot/cold if needed). Knockout drum - remove liquids before flare. Seal drum/molecular seal - prevent flashback. Flare stack - elevated or ground flare. Flare tip - smokeless operation, pilot system. Design considerations: Header sizing - API 521, consider choked flow, back pressure limits. Knockout drum - sized for largest liquid case, residence time 20-30 seconds. Purge gas - continuous flow to prevent air ingress. Steam/air injection - for smokeless combustion. Radiation - maintain safe distance from equipment and personnel (API 521 F-factor). Height - typically 20-100m depending on radiation and dispersion requirements. Pilots - redundancy for reliability.