En 13445-3 Link

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

is the European standard that specifies requirements for the design of unfired pressure vessels . It provides formulas, calculation methods, and rules to ensure the structural integrity of pressure-bearing components under various loading conditions. Key Content & Sections

Generally uses lower safety factors than ASME VIII, leading to thinner walls for similar pressures. EN 13445-3

Design of isolated or multiple openings and their reinforcement requirements.

Rules for determining required wall thicknesses for cylindrical, spherical, and conical shells. Key Content & Sections Generally uses lower safety

It is a harmonized standard under the European Pressure Equipment Directive (PED) .

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 It is a harmonized standard under the European

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