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Dished End (Vessel Head) Calculator

Calculate geometry, blank diameter, and weight for Torispherical and Ellipsoidal heads (DIN 28011, DIN 28013, SS 895) with nozzle configuration, QC reports, and browser-based 3D STEP export.

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pressure-vessel-dished-end-calc utility screenshot

What it does​

Instant calculation of pressure vessel head geometry, weight, and volume. It generates a visual profile including nozzle positions, exports a matching 3D STEP model, and produces a printable "Manufacturing Report" with expected tolerances for quality control.

When to use it (and when not to)​

Use it when:

  • You need to estimate the weight and blank diameter for material ordering.
  • You want to visualize nozzle positions relative to the head curvature.
  • You need a quick QC sheet with standard tolerances (DIN 28005-1) for the shop floor.
  • You want a browser-side 3D STEP file of the configured head for downstream CAD work.

Avoid it when:

  • You are designing ASME 2:1 Ellipsoidal heads (unless the geometry matches the provided DIN/SS presets manually).
  • You require ASME VIII Div 1 pressure ratings or stress analysis.

Inputs and outputs​

Inputs​

InputDescription
StandardChoose between DIN 28011, DIN 28013, or SS 895.
Geometry (Da, s, h1)Outer diameter, wall thickness, and straight flange height.
MaterialSelect from common grades (P265GH, Stainless, Titanium) to determine density.
Edge PrepConfigurable V-Bevel angle and root face dimensions.
NozzlesAdd nozzles with specific DN sizes and offset positions.

Outputs​

OutputFormatNotes
Geometry (H, h2, R, r)NumericFull height, crown height, dish radius, and knuckle radius calculations.
Weight & VolumeNumericEstimated finished weight and internal volume.
Blank DiameterNumericTheoretical flat plate diameter required for forming.
3D STEP modelSTEPExports the configured vessel head geometry as a browser-generated 3D file.
QC ReportPDF/PrintA formatted sheet with nominal values and blank fields for actual measurements.

How to use​

  1. Select the manufacturing standard (e.g., DIN 28011).
  2. Enter the Outer Diameter (Da), Thickness (s), and Straight Flange (h1).
  3. Configure the material and edge preparation (bevel angle/root face) if needed.
  4. (Optional) Add nozzles by specifying size (e.g., DN50) and offset from center.
  5. Download the 3D STEP model when you need the current head as a CAD file.
  6. Click "QC Report (PDF)" to generate the printable manufacturing sheet.

Example dataset: Standard: DIN 28011, Da: 1000 mm, s: 8 mm, h1: 25 mm, Material: P265GH.

  • Expected output: Total Height (H) calculated, weight estimation (~25kg), and a visual profile showing the dish radius and knuckle radius.

Accuracy and verification​

  • Geometry calculations follow the specific formulas for DIN 28011 (R=Da, r=0.1Da), DIN 28013, and SS 895.
  • Tolerances in the report are derived from DIN 28005-1 (Formed Heads).
  • Weight is calculated using standard densities (7.85 for Carbon Steel, 7.9 for Stainless).

FAQ​

  • Which standards are supported? DIN 28011 (Torispherical), DIN 28013 (Ellipsoidal), and SS 895.
  • Does it calculate the blank diameter? Yes. It estimates blank diameter using standard factors (e.g., 1.09x or 1.14x Da) plus the straight flange.
  • Can I configure weld preparation? Yes. You can select between a square cut (None) or a V-Bevel with configurable angle and root face.
  • Is the QC report customizable? The QC report is auto-generated based on your inputs and includes DIN 28005-1 tolerances. It prints directly from the browser.
  • Are my entries saved? No. Close the page to clear everything; it stays in your browser memory only.

Changelog​

  • Added browser-based 3D STEP export for vessel heads.
  • v0.1.3b: Added QC Report generation, nozzle configuration, and edge prep visualization.
  • Initial release.

Feedback / bug report​

  • Open a GitHub issue
  • Email or DM with the slug pressure-vessel-dished-end-calc so we can reproduce the issue
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