How To Consider Thermal Expansion In The Design Of Copper Compression Fitting?

Introduction：

PEX Compression Fitting refers to a type of pipe connection device that utilizes a metal compression sleeve to securely connect PEX pipes.

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It is very important to consider the thermal expansion problem when designing the copper casing, because it directly affects the stability and safety of the pipe system. Here are some key steps and points to take into account thermal expansion during the design process:

Determine the coefficient of thermal expansion:

According to reference article 1, the linear expansion coefficient of copper pipe is 17×10^-6m/(m·℃), and the volume expansion coefficient is 50×10^-6℃^-1. These values are the basis for evaluating the thermal expansion behavior of copper casing.

Predicted temperature range:

Predict the range of temperature changes that copper casing may experience during operation. This depends on the specific application scenario, such as fluid temperature in the pipeline system, ambient temperature changes, etc.

Calculation of thermal expansion:

Using the coefficient of thermal expansion of copper and the predicted range of temperature change, the thermal expansion of copper bushing under temperature change is calculated by the formula. This helps to understand the size changes of pipe fittings at different temperatures.

Design suitable gaps and connections:

When designing copper casing fittings, ensure that there is sufficient clearance between the fittings to accommodate dimensional changes due to thermal expansion. This prevents the pipe from squeezing or breaking due to thermal expansion.

Use flexible joints or expansion joints to accommodate the thermal expansion and contraction of the pipe.

Optimized support and fixation:

Refer to the pipe support design mentioned in Article 4, through reasonable support and fixing methods, to ensure that the external force of the copper card casing is evenly distributed during thermal expansion, reducing stress concentration and pipeline displacement.

Consider corrosion and heat protection layers:

Although corrosion and thermal protection layers are mainly used to protect pipes from corrosion and high temperatures, they can also reduce the impact of thermal expansion on pipes to a certain extent. By coating specialized thermal protection materials, the degree of temperature influence of the pipe can be reduced and the amount of thermal expansion can be reduced.

Conduct simulations and tests:

Finite element analysis (FEA) or other simulation tools are used to simulate and analyze the behavior of copper casing under thermal expansion conditions. This helps to predict the performance and potential problems of the pipeline system.

After the design is complete, practical tests are carried out to verify the thermal expansion performance of the piping system. This ensures that the design meets the expected requirements and makes the necessary adjustments and optimizations when needed.

In summary, considering thermal expansion in the design of copper casing requires determining the coefficient of thermal expansion, predicting the range of temperature variations, calculating the amount of thermal expansion, designing suitable gaps and connections, optimizing support and fixation methods, considering corrosion and thermal protection layers, and conducting simulations and tests. These steps and points will ensure that the copper bushing has good stability and safety in long-term use.