Standard dished head (Standard Dished)
The common catalogue head for atmospheric and low-pressure tanks
The standard dished head is one of the most common catalogue heads in industry; its crown radius (CR) equals the vessel's inside diameter (Di) and its knuckle radius (KR) is usually chosen between 15 and 50 millimetres according to the vessel's diameter range. This fixed KR range has made this type available on the market as a catalogue item in standard dimensions.
What is a standard dished head?
The standard dished head is one of the most common catalogue heads; the crown radius equals the inside diameter and the knuckle radius is usually chosen between 15 and 50 mm according to the vessel diameter. This fixed KR range is what has made it a catalogue item.
In depth and stress it is very similar to torispherical, but because it is common in manufacturers' tables it is often the default for atmospheric or low-pressure tanks.
Geometry formulas of the standard dished head
The main dimensions come from the inside diameter and the catalogue knuckle range:
Unlike torispherical, which takes KR as a percentage of the diameter, the standard dished head uses a fixed millimetre range; that is why it is more consistent and more readily available in catalogues.
Online calculation
See the head's dimensions, volume and weight for a real diameter and thickness
Standard dished head (Standard Dished)
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
For tanks without a critical design pressure, choosing a common catalogue head simplifies supply time and matching with accessories (such as standard hatches); that is why the standard dished head is often the first default for atmospheric tanks.
Gallery of heads we have made
Standard dished 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
