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Flat-Bottom Heads
Flat heads / formed flat-bottom ends · 平底形封头
Profile and terminology
The FHA flat-bottom head has a flat central area, a rounded edge and a straight flange. This formed profile is different from a plain flat plate used as a closure.
GB/T 25198-2023 models: FHA
Specify the inside diameter, corner radius and straight flange so the formed shape can be identified. For the illustrated FHA profile, inside depth is the sum of the knuckle radius and straight flange length. Suitability and thickness must be checked for the actual vessel design.
What to include in your inquiry
Inside diameter; nominal thickness; minimum formed thickness; knuckle radius; straight flange length; inside depth; 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 flat-bottom 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 referenceFormed flat-bottom head dimensions
A formed flat-bottom head includes its bottom profile and formed edge. It should not be confused with an unspecified flat plate or assumed to have the same pressure rating as a dished head.
| Diameter | State the diameter basis from the approved drawing. |
|---|---|
| Corner radius | Provide the formed corner radius and any edge transition details. |
| Flange height | Specify the straight flange and overall height where applicable. |
| Thickness and material | Include nominal and minimum formed thickness and the specified material grade. |
Can a flat-bottom head replace a dished head?
That decision requires the vessel design to be reviewed for the intended service. The quotation form records geometry and purchasing needs; it does not establish a pressure rating or approve substitutions.
Flat-Bottom 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 flat-bottom 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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