Hemispherical Tank Head technical overview.
Hemispherical Tank Head from JINYI is specified by its application, material and connection or drawing requirements. Review the selection schedule and enquiry requirements below to prepare a quotation for your project.
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Specification basis: The schedule below distinguishes industry geometry from order-specific requirements. Final dimensions, performance and price are defined in the approved quotation and drawing. Photographs identify the product family.
What is a hemispherical tank head?
A hemispherical tank head is a half-sphere-shaped end closure. Its deeper profile creates a different vessel envelope and shell interface from a shallow dished or elliptical head.
Key dimensions and installation fit
A hemispherical profile is one half of a sphere. Its ideal internal radius and crown depth are each half the inside diameter; any weld land or flange must be specified separately. Pressure capacity and finished wall thickness require the vessel design. Compare related configurations: torispherical tank head, dished only tank head.
How to specify the hemispherical tank head
Provide the design diameter, spherical radius, edge thickness and finished height. Identify nozzle or manway openings, corrosion allowance and the applicable design requirements. Whether the head is one-piece or fabricated from formed sections must be agreed for the particular order.
State whether the vessel interface uses inside or outside diameter. Define crown shape, dish depth, straight flange, wall thickness and edge preparation independently. Vessel pressure, temperature, vacuum, corrosion allowance, forming thinning and openings affect the final design; shape dimensions alone do not give a working-pressure rating.
Technical data for the hemispherical tank head
| Shape | Half-sphere |
|---|---|
| Internal radius | 0.50 × inside diameter |
| Internal crown depth | 0.50 × inside diameter for an ideal hemisphere |
| Straight flange or weld land | Specified separately on the drawing |
| Diameter basis | State inside or outside diameter explicitly |
| Thickness | Minimum finished thickness to design; forming allowance separate |
| Material | Exact grade and supplied condition to the vessel specification |
| Edge preparation | Bevel, root face and fit-up to the joint drawing |
| Inspection | Profile, ovality, minimum wall and agreed examination |
Sizes and dimensional requirements
Use the named standard for standardized interfaces and the controlled drawing for custom dimensions. Confirm units, diameter datums, minimum finished thickness and any mating-component requirements. A catalogue dimension is not a universal tolerance, capacity or pressure rating.
Dimensions and tolerance schedule
| Individually toleranced features | Limits and datum system on the approved drawing |
|---|---|
| General tolerances | Standard, edition and class apply only when specified |
| Formed-head acceptance | Profile, ovality and minimum finished wall to vessel specification |
Individually toleranced dimensions and functional requirements take precedence over a general tolerance note. Specify the governing standard and acceptance method in the order documents; a tolerance shown by another manufacturer does not establish JINYI manufacturing capability.
Materials, inspection and documentation
Inspect the interface diameter, profile, dish depth, straight flange and minimum finished wall thickness against the vessel drawing. Check openings and edge preparation separately. Specify material traceability, forming records and examination where required. Keep the design code and drawing revision with the ordered component.
State the exact material designation and supplied condition, the controlled drawing revision and the required inspection reports before ordering. Separate material certification from dimensional checks and functional or pressure testing. Agree the acceptance limits for the ordered component and identify any additional witnessing, marking or packing requirements. Use technical help to prepare the drawing, material and inspection questions for review. Use the custom manufacturing and OEM guidance to define the drawing, material and inspection scope.
Installation and handling guidance
Review lifting and transport arrangements for the deep profile. Check the circular shell interface and edge preparation before fit-up. The vessel drawing should identify measurement datums and any forming or weld inspection needed at the head-shell junction.
Where the hemispherical tank head is used
- Tank fabrication. Drawing-defined ends and covers matched to the shell interface.
- Vessel manufacture. Formed components selected through the complete vessel design.
- Equipment repairs. Replacement geometry, openings and edge details checked against the existing assembly.
How to order a hemispherical tank head
Send the required configuration, material, quantity, destination and controlled drawing to JINYI. Identify changed dimensions, mating components, operating conditions and inspection scope. For a repeat order, include the previous approved revision and state any changes. The final quotation defines the supplied geometry, documentation, price and delivery terms.
Quantity prices and order preparation
| 1–9 pcs | US$125.00 / piece |
|---|---|
| 10–49 pcs | US$125.00 / piece |
| 50+ pcs | US$125.00 / piece |
Indicative budget pricing selected from public supplier listings. Selected upper amount from the US$25–125 listed hemispherical-head family range. Actual diameter, thickness and material require quotation. Linmei hemispherical-head catalogue. Final JINYI pricing depends on the confirmed specification, quantity, inspection and delivery scope. Quantity-specific terms are confirmed with the final quotation.
Engineering and pricing references
Tank Components Industries hemispherical heads. These sources explain the named product geometry or selection method. Their certifications, rated capacities and manufacturing capabilities belong to the named organizations.
Other JINYI products worth comparing
Review the tank manhole covers catalog for adjoining components, connection choices and alternative product forms.
Request a hemispherical tank head quotation from JINYI with the drawing, material and quantity required for your project.
Hemispherical Tank Head selection and quotation checklist
The hemispherical profile has a deeper geometric envelope than a shallow dished form. Define the diameter basis, thickness and attachment edge on the vessel drawing. Use the photographed product form to identify the arrangement, then use the controlled drawing to define what will be supplied. Similar-looking components can have different end details, load paths or maintenance requirements.
Hemispherical Tank Head dimensions and tolerances
The first comparison for this hemispherical tank head is sphere radius and overall depth. Mark the dimensions that control mating, alignment and installation space on the enquiry drawing. Give units for every value and identify the datum from which it is measured. If a dimension is critical, specify its individual tolerance and measurement method rather than relying on a general tolerance note.
A hemispherical profile is one half of a sphere. Its ideal internal radius and crown depth are each half the inside diameter; any weld land or flange must be specified separately. Pressure capacity and finished wall thickness require the vessel design. Review the selection schedule together with the final drawing and inspection requirements.
Prepare the material and interface information
For a hemispherical tank head enquiry, identify the required material designation and supplied condition. Describe the mating components, attachment method and environment. Include the operating temperature and any relevant pressure, movement or structural load. These inputs should describe the actual installation, including changes between normal operation, start-up and maintenance where applicable.
Specify coatings, surface finish and marking separately from the base material. If traceability is needed, identify the record required and how it must correspond to the delivered component. Agree whether inspection covers dimensions, material documentation, welds or functional testing; these are different checks with different acceptance criteria.
Custom hemispherical tank head quotation
Attach the latest drawing revision, required quantity and delivery destination when contacting JINYI. Highlight departures from the illustrated arrangement, including changed dimensions, connections, finish and packing. For repeat orders, reference the approved configuration and list changes explicitly so an earlier drawing is not assumed to remain current.
Compare quotations using the same geometry, grade, supplied condition, unit of supply and inspection scope. A piece, a segment and a complete assembly can represent different quantities. Confirm quantity discounts and delivery terms with the final quotation.
Compare related component arrangements
Evaluate this hemispherical head by its actual sphere radius and overall depth and the required tank head arrangement. The photographs below show separate JINYI products for comparison. They are linked to their own technical pages and are not additional gallery views of this hemispherical tank head.
| Photo | Related product | Selection detail |
|---|---|---|
 | Elliptical Tank Head | Head depth and shape ratio. Compare this separate product when the drawing requires its particular arrangement. |
 | Torispherical Tank Head | Crown radius and knuckle radius. Compare this separate product when the drawing requires its particular arrangement. |
 | Dished Only Tank Head | Cap depth and attachment edge. Compare this separate product when the drawing requires its particular arrangement. |
Questions to resolve before ordering
Which dimensions need checking first?
Start with sphere radius and overall depth and the mating or mounting detail. Check nominal designations against measured dimensions, then review the installation envelope. Photographs help identify the form; the drawing provides the dimensional basis for acceptance.
What should the quotation include?
A hemispherical tank head quotation should identify the configuration, drawing revision, material, quantity, price basis and agreed inspection records. Keep these details together with the approved order so receiving inspection can compare the delivered product with the specified component.
Independent terminology reference
DVAI tank head profile families provides an independent reference for component terminology. Use the specified standard and edition where required by the project. This link does not establish JINYI certification, product approval or interchangeability with another manufacturer.
- Spec
- Defined configuration
- Grade
- Material requirement
- US$125.00
- Indicative unit price
- 3
- Quantity bands
- Product arrangement — Hemispherical head
- Engineering selection — A hemispherical profile is one half of a sphere. Its ideal internal radius and crown depth are each half the inside diameter; any weld land or flange must be specified separately. Pressure capacity and finished wall thickness require the vessel design.
- Quotation scope — Material, drawing revision, quantity, inspection and delivery terms confirmed together
At a glance
- Product form
- Hemispherical head
- Shape
- Half-sphere
- Internal radius
- 0.50 × inside diameter
- Internal crown depth
- 0.50 × inside diameter for an ideal hemisphere
- Pricing
- Indicative USD pricing
| Shape | Half-sphere |
|---|---|
| Internal radius | 0.50 × inside diameter |
| Internal crown depth | 0.50 × inside diameter for an ideal hemisphere |
| Straight flange or weld land | Specified separately on the drawing |
| Diameter basis | State inside or outside diameter explicitly |
| Thickness | Minimum finished thickness to design; forming allowance separate |
| Material | Exact grade and supplied condition to the vessel specification |
| Edge preparation | Bevel, root face and fit-up to the joint drawing |
| Inspection | Profile, ovality, minimum wall and agreed examination |
| Individually toleranced features | Limits and datum system on the approved drawing |
|---|---|
| General tolerances | Standard, edition and class apply only when specified |
| Formed-head acceptance | Profile, ovality and minimum finished wall to vessel specification |
