DIN 28013 semi-ellipsoidal head
The German standard common in European process vessels
The semi-ellipsoidal head to the German standard DIN 28013 is defined by two parameters: crown radius CR = 0.8×Do and knuckle radius KR = 0.154×Do (both based on the vessel's outside diameter). These ratios were chosen to create a shape between torispherical and 2:1 elliptical.
What is a DIN 28013 semi-ellipsoidal head?
The semi-ellipsoidal head to the German standard DIN 28013 is defined by two parameters: crown radius CR = 0.8×Do and knuckle radius KR = 0.154×Do. These ratios create a shape between torispherical and 2:1 elliptical.
This standard is particularly common in the process industries of Germany and Central Europe. Its SF is taken as at least 3 times the plate thickness, slightly less than the 3.5 times common in other standards.
Geometry formulas of the DIN 28013 head
Both main parameters are defined from the vessel's outside diameter:
Unlike many heads that define CR/KR from Di, DIN 28013 takes both from Do; keep this difference of basis in mind when matching it to ASME projects.
Online calculation
See the head's dimensions, volume and weight for a real diameter and thickness
DIN 28013 semi-ellipsoidal head
Liquid level and volume inside this head
How the head is mounted
Development of this head (flat blank before forming)
The diameter of a flat plate of the same thickness and material that weighs the same as the formed head — an initial workshop estimate based on equal weight, not allowing for thickening or extra stretching at the knuckle.
The vessel head production process
From calculating the blank diameter to final edge preparation — the steps of making a vessel head in the workshop
Calculating the blank diameter
Cutting a disc from plate with the diameter and thickness calculated for the head type and vessel diameter
Cutting the plate blank
Precise cutting of steel or stainless plate by plasma, laser or gas according to the technical drawing
Pressing the head
Hot or cold forming of the disc with a die and industrial press until it reaches the final head profile
Edge preparation
Machining the edge, bevelling and preparing the weld area for fitting to the vessel shell
Video coming soonChoosing a head: the balance between pressure, cost and time
If the client or project standard explicitly requires DIN, or similar earlier equipment in the production line was built to this standard, staying with DIN 28013 makes it simpler to keep the technical documentation consistent.
Gallery of heads we have made
DIN 28013 semi-ellipsoidal head gallery
Applications and industries served
Buying heads from Behineh Ab
Six steps from first contact to delivery
Give the outside diameter, plate thickness, head type and required material.
The calculated weight, unit price and delivery time are sent the same business day.
Plate is supplied with the mill certificate and inspected on arrival before cutting.
Cutting the disc, hot or cold pressing depending on thickness, and checking dimensions with a template.
Machining the cylindrical edge and bevelling it ready for welding to the shell.
Packing, issuing the part identification sheet and shipping nationwide.
What sets us apart
Price inquiry
vessel head
Enter the diameter, thickness and head type; you will receive the calculated weight and unit price.
- Quotation with the exact weight of the part
- Standard heads delivered in 7 business days
- Shipping nationwide
