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What is the difference between the inner diameter and outer diameter of the heat exchange pipe

Mr. Laijing Bu January 10, 2026


I. Definitions of Inner Diameter and Outer Diameter

Before understanding the inner and outer diameters of the heat exchange tubes, we need to first understand their definitions. The inner diameter refers to the diameter of the interior of the pipe, while the outer diameter refers to the diameter of the exterior of the pipe. 

II. Why It Is Necessary to Pay Attention to Inner Diameter and Outer Diameter

When selecting the appropriate heat exchange tubes, both the inner diameter and the outer diameter are important considerations. The size of the inner diameter is directly related to the flow velocity of the fluid inside the tube, while the size of the outer diameter is related to the size and installation method of the heat exchange tube in the equipment. 

III. Inner and Outer Diameters of Heat Exchange Tubes

The diameter of the heat exchange tube refers to the outer diameter. When selecting the heat exchange tube, we need to focus on the outer diameter rather than the inner diameter. This is because the outer diameter of the heat exchange tube is related to its size and installation method in the equipment, while the inner diameter is related to the fluid flow rate. Moreover, in actual production, manufacturers usually use the outer diameter as the specification to mark and describe the heat exchange tube. 

IV. Summary

The diameter of the heat exchange tube refers to its outer diameter, not the inner diameter. When selecting the appropriate heat exchange tube, we need to consider the size of the outer diameter in relation to the dimensions of the equipment and the installation method. At the same time, we also need to pay attention to the size of the inner diameter and its correlation with the flow velocity of the fluid inside the tube. Therefore, when choosing the heat exchange tube, we need to comprehensively consider the sizes of both the inner and outer diameters based on the specific circumstances.


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