En 13445-3 Apr 2026

General principles, corrosion/erosion allowances, and load cases like wind and seismic activity.

Simplified (Clause 17) and detailed (Clause 18) methods for evaluating fatigue life. EN 13445-3

Annex B provides the "Direct Route" for design using Finite Element Method (FEM) analysis for complex geometries. Scope and Application heat exchanger tubesheets

Design of isolated or multiple openings and their reinforcement requirements. EN 13445-3

The latest major revision is EN 13445-3:2021 , with an active amendment A1:2025 .

Detailed design rules for flat ends, flanges, heat exchanger tubesheets, and bolted ends.

for certain components (like flanges or tubesheets). Comparison between EN 13445-3 and ASME Section VIII . Annex B details for FEA-based design. EN 13445 "Unfired pressure vessels" - UNM