Diffuser head (Diffuser)
A deeper dome for flow and fluid distribution requirements at the vessel inlet/outlet
In its basic formula the diffuser head is like a standard dished head (KR in the 15 to 50 millimetre range, SF at least 3.5 times the thickness), but its crown radius (CR) is taken as 1.3×Di instead of being equal to the inside diameter; that is, a flatter dome that is at the same time deeper in the knuckle area than a standard dished head.
What is a diffuser head?
In its basic formula, a diffuser head is like a standard dished head, but its dome radius is taken as 1.3×Di instead of being equal to the inside diameter; that is, a dome with a different geometry for spreading flow.
This type is usually chosen where even distribution of the incoming or outgoing fluid matters, not just closing the end of the vessel; the name "diffuser" comes from this role.
Geometry formulas of the diffuser head
The main difference from standard dished is only in the dome radius coefficient:
In some applications the head also shapes the path by which fluid enters or leaves. A suitable dome radius can prevent excessive turbulence near the nozzle.
Online calculation
See the head's dimensions, volume and weight for a real diameter and thickness
Diffuser head (Diffuser)
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
In some applications the head is not just a structural cover but also shapes the path by which fluid enters or leaves. Choosing a suitable crown radius can prevent excessive turbulence or uneven flow distribution near the inlet nozzle; the diffuser head is designed for exactly this purpose.
Gallery of heads we have made
Diffuser 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
