Calculate actual local gas passages around beams and grids, coordinate the support with packing segmentation, and balance structural strength against vapor uniformity at the first packing layer.

Convert vessel inclination into elevation difference, evaluate gravity and pressure-fed distributors, trays and collectors at all rates, and survey the shell and internals against a common gravity datum.

Trace the full collector discharge system, identify liquid-column and vapor-pocket transients, coordinate diameter and sealing, and design the collector nozzle and pipe supports for credible dynamic reactions.

Map every restricted internal, analyze steam collapse and condensate seals through the actual shutdown sequence, and verify that trays, collectors and their connections can withstand the credible differential pressure in either direction.

Reconstruct peak temperature, duration and cooling history; inspect vulnerable materials and joints; recheck distorted components with justified properties; and verify hydraulic function before controlled restart.