Flare Stack Height Calculator

Compute the minimum flare stack height so the flame radiant heat intensity at a ground-level receiver stays within the API 521 Table 9 limit — the primary stack-height criterion per API 537 §4.13.3.1. Flame length (API 521 Fig 8), tip exit velocity (Eq C.2) and wind-driven flame distortion (Figure 9) are computed from the actual flow, then the stack is sized from the point-source radiation (Eq 24).