Dished heads are curved end closures for cylindrical pressure vessels, designed to withstand internal pressure and distribute stress efficiently.
Dished heads, also known as dished ends or tank heads, are hemispherical or elliptical domed components that seal the ends of cylindrical pressure vessels, shells, and tanks. They are engineered to provide structural integrity under internal pressure by distributing stress uniformly across the surface, reducing stress concentrations compared to flat ends. Common types include hemispherical, elliptical (2:1 ratio), torispherical (dished and flanged), and conical heads, each optimized for specific pressure ratings, volume requirements, and manufacturing considerations. They are critical in industries handling gases, liquids, or processes requiring contained pressure.
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Common types include hemispherical (for high pressure), elliptical (2:1 ratio for balanced stress), torispherical (with knuckle for cost-effectiveness), and conical heads (for gradual transitions).
They are typically formed by hot or cold pressing, spinning, or forging steel plates, followed by welding, heat treatment, and non-destructive testing (e.g., radiography) to ensure integrity.
Key factors include pressure rating, temperature, corrosion resistance, material cost, vessel diameter, and compliance with standards like ASME or DIN.
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