# How to calculate thickness of the segmental ring?

• saran
In summary, the Segmental ring will withstand the entire force acting on the bonnet due to the working pressure. It will be placed on the moving shaft. The maximum operating pressure and temperature will vary depending on the application.
saran
Moved from new member intro forum
Hi,
I am working as a design engineer. I am new to pressure seal bonnet Valve design. In that valve concept we are using a ring called as Segmental ring. The purpose of this ring is to withstand the entire force acting on the bonnet due to is working pressure. Now i want to know how to calculate the thickness of that ring. Here i am attaching the Picture for your ref. Thanks in advance.

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• 10e.jpg
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Hi saran

And also, welcome to PF!

Stevie

Baluncore said:
Here is a link to; Mechanical packing design and theory of operation. It includes segmental ring seals.
http://www.c-p-i.com/media/cms_page_media/11/cpi mech pck bklt US-updte6 11-.pdf

Baluncore said:
Here is a link to; Mechanical packing design and theory of operation. It includes segmental ring seals.
http://www.c-p-i.com/media/cms_page_media/11/cpi mech pck bklt US-updte6 11-.pdf

Hi Baluncore thanks for your reply. What kind of details you want for this?

Is this for a reciprocating or a rotating shaft?
Is it for air, steam or some other fluid?
What is the maximum operating pressure and temperature?

In your section diagram 10e.jpg I see no contact between a moving shaft and a seal that will wear. It appears to only involve a static packing. So where is your segmental seal going to be placed?

## What is a segmental ring?

A segmental ring is a circular structure made up of multiple segments that can fit together to form a complete ring. These rings are often used in construction and engineering projects to create arches or other curved structures.

## How is the thickness of a segmental ring calculated?

The thickness of a segmental ring is typically calculated by considering the forces acting on the ring and the materials used to construct it. This calculation involves factors such as the desired strength and stability of the ring, as well as the type and properties of the materials being used.

## What factors affect the thickness of a segmental ring?

The thickness of a segmental ring can be affected by several factors, including the desired strength and stability of the ring, the type and properties of the materials used, and the size and shape of the ring itself. Other factors such as environmental conditions and the purpose of the ring may also play a role in determining its thickness.

## Are there any standardized methods for calculating the thickness of a segmental ring?

While there are some general guidelines and formulas that can be used to calculate the thickness of a segmental ring, there is no single standardized method. The exact calculations and considerations may vary depending on the specific project and its requirements.

## What are the consequences of an incorrect thickness calculation for a segmental ring?

An incorrect thickness calculation for a segmental ring can have serious consequences, including structural instability, increased risk of collapse or failure, and potentially costly repairs or replacements. It is important to accurately calculate the thickness of a segmental ring to ensure its safety and effectiveness in a project.

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