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What is Thermal Expansion Coupling? The Role of Ss Thermal Expansion Joints

When working with civil and industrial piping systems, we easily come across a device called a thermal expansion joint. So what is thermal expansion joint, heat expansion tube? What is their role in the pipeline system?

What is Thermal Expansion Coupling? What Is Stainless Steel Thermal Expansion Joint?

In high school physics lessons, we learned about thermal expansion of matter. In particular, the piping systems are usually made of plastic/metal with a large length. Therefore, the pipeline has an inevitable expansion when there is a change in temperature in the environment. 

Thermal Expansion Coupling

The image shows the expansion of metal pipes when the temperature is increased.

The introduction of the products of stainless steel expansion joints , heat expansion pipes is to eliminate the problem of thermal expansion of the above pipes. Especially for long pipes there will be a large longitudinal expansion margin.

What is Thermal Expansion Coupling

The image shows the role of the thermal expansion joint, which helps to keep the pipe length intact.

The heat change on the pipeline can come from: hot and cold weather, day and night, due to a medium such as hot and cold water, due to the influence of the surrounding environment.

The thermal expansion tube eliminates not only expansion due to heat gain but also contraction due to heat loss.


The Role of Thermal Expansion Joints

With a large pipeline system such as: fire protection, water supply and drainage, .. in factories, buildings, .. thermal expansion if not taken care of will cause serious consequences.

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The risk of tube breakage and perforation is very worrisome because the expansion by temperature is not suppressed.

The thermal expansion tube plays the role of protecting the pipe against thermal expansion of the pipe. Without them, the pipeline will sooner or later run into problems:

- Expansion breaks the structure, causing pipe deformation: Changing the length of any pipe segment will disrupt the structure of the system. Dragging the pipeline is deformed and crooked. The longer the tube, the larger the size, the greater its expansion. With a 10M long pipe leading hot water at 300 degrees Celsius, it will make the pipe about 3 CM longer than normal. 

- Expansion will cause pipeline rupture: The expansion of the pipeline is prevented from reaching a certain degree, which will lead to pipe breakage, pipe leakage.

- Thermal expansion will disrupt the operation of the whole plant system: Obviously for a factory that depends on the oil pipeline to operate the production lines. If a piece of pipe is stretched leading to a crack, the whole system will have to stop. The repair time will last up to a few days with no small cost.

Thermal expansion joints, heat expansion pipes have corresponding roles: Help protect the pipe structure, against warping caused by thermal expansion. Eliminates the risk of pipe rupture leading to impact, stopping the entire pipeline system and related production systems.


Structure Of Thermal Expansion Joint, Thermal Expansion Tube

In fact, there are quite a few types of expansion joints with quite complex structures. Below is the main structure of the product designed and manufactured at E-Flex Vietnam. This product line is being distributed by the company nationwide.

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The product is composed of 3 main parts: tube, flange and directional.

Accordingly, expansion joints have 2 main types:

- Basic Expansion Joints (Axial Expansion Joints):

This line is composed of 3 main parts: Stainless steel pipe has the ability to expand due to heat; Two flanged ends to connect to two pipe ends; Fixed Ty.

In particular, the inner tube is the part directly responsible for thermal expansion, the amplitude of expansion is up to -40/+20 CM. In addition, the fixed part helps to limit the expansion amplitude, preventing the tube from breaking in case the temperature changes too high.

- External Pressurized Expansion Joint:

This line has a more complex structure, consisting of 4 main parts: Inox pipes have the ability to expand due to heat; Two connectors to 2 pipe ends; The inner tube helps to separate the medium from the inner tube; Steel jacket to protect the tube.

Due to the more complex structure, the price of the finished product is higher. In return, the customer will have the expansion tube covered with a protective layer, avoiding the leakage leading to spraying the liquid out. The medium does not come into direct contact with the inner tubes to help prolong the life of the equipment.


Are Thermal Expansion Joints Made In E-Flex Vietnam Reliable?

E-Flex Vietnam is a manufacturer and distributor of stainless steel flexible joints, stainless steel thermal expansion joints EFR brand. The company's first priority is to meet international standards with EUROPE QUALITY (European Standard). 

As an experienced expert in this industry, the company is absolutely a reputable place to order the production of stainless steel flexible joints.


There are 5 main reasons for you to buy with confidence:

- 100% Quality test of expansion joints before shipment
- Pipe materials are imported from Europe for reliable quality.
- Pipelines withstand harsh working conditions: temperatures up to 427 degrees Celsius.
- High product finish in terms of aesthetics, equipment structure.
- Made in Vietnam with fast delivery time.

 See the range of thermal expansion joints that E-Flex produces

 View EFR . Thermal Expansion Joint Catalog


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