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Hemispherical Heads
Half-sphere heads / hemispherical vessel ends · 半球形封头
Profile and terminology
A hemispherical head follows a half-sphere profile. Its inside spherical radius is half the inside diameter. Shape alone does not establish a pressure rating or the thickness required for a particular application.
GB/T 25198-2023 models: HHA
The HHA illustration in the inquiry tool shows the version without a straight flange. For that illustrated form, the inside depth equals the inside radius. If a drawing calls for an additional flange or another edge arrangement, describe it in the notes and provide the drawing reference.
What to include in your inquiry
Inside diameter; nominal thickness; minimum thickness after forming if specified; inside depth; edge or flange requirements; material grade; quantity.
Use millimetres for dimensions. Identify the exact material grade rather than only writing “steel” or “stainless steel”. You can also include edge preparation, inspection requirements, delivery needs and a drawing reference in the notes.
Configure hemispherical headsThe configurator creates an inquiry list. The email button opens your mail application; it does not submit an order or send a message automatically.
Drawing and design review
These descriptions identify geometry and information needed for an inquiry. They do not establish allowable pressure, certify compliance or replace a vessel design calculation. Confirm the applicable standard, drawing and final dimensions before ordering.
GB/T 25198-2023 — official standard referenceHemispherical head dimensions and purchase requirements
A hemispherical head has a half-sphere profile. Its geometry must be distinguished from elliptical or torispherical heads when preparing a pressure vessel purchase specification.
| Diameter | State the required inside or outside diameter and approved profile. |
|---|---|
| Thickness | Identify nominal thickness and minimum required thickness after forming. |
| Joining edge | Provide the weld-edge detail and any machining requirements. |
| Inspection | List required dimensional checks, material documentation and applicable inspection requirements. |
Is a hemispherical head selected by diameter alone?
No. The material, thickness, joining details and design requirements are also needed. Submit an approved drawing for review with your quantity and delivery destination.
Hemispherical Heads from Bingming
Contact Linyi Bing Ming Head Plate Manufacturing Co., Ltd. about manufacturing requirements for your boiler or pressure vessel project. Product photographs and company records are available in our catalog.
View hemispherical heads product photographs · Explore the factory and product catalog
How do I request a quotation?
Select a profile, enter the dimensions in millimetres, specify the material grade and quantity, and add drawing or inspection requirements. Generate an inquiry item and use the email button to prepare your message.
Which material should I specify?
Provide the exact grade required by your drawing, such as Q345R or S30408, rather than only stating carbon steel or stainless steel. Material availability, forming requirements and suitability for the intended service need confirmation for each project.
Does a GB/T profile imply ASME certification?
No. The GB/T 25198-2023 diagrams describe the profiles used by this inquiry tool. If a project requires another code, provide its designation and drawing for review; no ASME certification is claimed here.
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