blog about Key Parameters of DIN 28013 for Elliptical Pressure Vessel Heads

The safety and efficiency of pressure vessels largely depend on the performance of their heads. Among various designs, elliptical heads conforming to the DIN 28013 standard play a pivotal role in ensuring optimal performance. This article examines the key design parameters of these specialized components.

DIN 28013 standard elliptical heads feature a distinctive oval geometry that optimizes stress distribution, significantly enhancing pressure-bearing capacity and operational safety. For engineers and designers, understanding these parameters is essential for proper application.

• External Diameter (D₀) & Internal Diameter (Dᵢ): These fundamental dimensions determine head-to-shell connections. D₀ represents the maximum outer diameter, while Dᵢ indicates the maximum inner diameter.
• Crown Radius (CR): Defining the curvature of the elliptical head's apex, this parameter typically equals 0.8 times the external diameter (D₀), significantly influencing stress distribution patterns.
• Knuckle Radius (KR): Located at the transition zone between the crown and cylindrical shell, this radius usually measures 0.154 times D₀. Smaller knuckle radii help minimize stress concentration.
• Straight Flange Height (SF): This vertical edge section typically measures three times the wall thickness (t), though customizable. The straight flange facilitates secure welding to the vessel shell.
• Head Depth (DH): Calculated as 0.255D₀ – 0.635t, this vertical measurement from apex to straight flange affects both volumetric capacity and dimensional specifications.
• Total Internal Height (THᵢ): The sum of straight flange height (SF) and head depth (DH), representing the component's complete vertical dimension (THᵢ = SF + DH).
• Wall Thickness (t): This critical parameter directly determines pressure-bearing capacity, requiring precise calculation based on design pressure and material strength.

Proper understanding and application of DIN 28013 elliptical head parameters are fundamental to pressure vessel reliability. Through optimized parameter selection, engineers can enhance structural integrity, operational safety, and service longevity.