Vessel Head

A vessel head(also referred to as a dished end,head,or end closure)is a critical component that seals the open ends of cylindrical pressure vessels,providing structural integrity and containing internal or external pressure loads.It is one of the most vital and highly engineered parts of pressure vessels,directly influencing safety,performance,and cost.Vessel heads are widely applied in industries including petroleum,chemical,energy,pharmaceutical,food&beverage,and nuclear power.

Core Functions

Pressure Containment:Withstands internal/external pressure and distributes stress evenly.

Sealing:Isolates internal media(gases/liquids)from the external environment.

Structural Support:Forms a rigid end structure,enhancing overall vessel stability.

Space Optimization:Curved profiles maximize internal volume while minimizing height compared to flat ends.

Common Types&Characteristics

1.Hemispherical Head

Shape:Half-sphere with uniform curvature.

Features:Optimal stress distribution,minimal thickness for high pressure,excellent fatigue resistance.

Pros:Highest pressure capacity,material-efficient.

Cons:Complex forming,high cost,deep profile.

Applications:High-pressure reactors,gas storage,cryogenic tanks.

2.2:1 Ellipsoidal(Elliptical)Head

Shape:Semi-ellipse with major axis twice the minor axis(standard 2:1 ratio).

Features:Smooth stress transition,moderate height.

Pros:Balanced strength and economy,widely used.

Cons:Slightly thicker than hemispherical heads.

Applications:Boilers,heat exchangers,mid-to-high pressure vessels.