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Mechanical Engineer - Interview Questions
What is the basic difference between a pipe and a tube?
Pipes and tubes are both hollow cylindrical structures used for the conveyance of fluids (liquids or gases), but they have distinct differences in terms of how they are manufactured, their applications, and their dimensions. Here are the basic differences between a pipe and a tube:

1. Manufacturing Process :

* Pipe : Pipes are typically manufactured using two methods: seamless and welded. Seamless pipes are made by piercing a solid billet of metal and then elongating it into a hollow tube, while welded pipes are formed by welding together rolled steel plates or sheets to create a cylindrical shape.

* Tube : Tubes are generally manufactured by extrusion or rotary piercing, followed by further processing like cold drawing or rolling. The manufacturing process for tubes is more precise and results in tighter tolerances compared to pipes.


2. Dimensional Differences :

* Pipe : Pipes are characterized by nominal sizes based on their outside diameter (OD). For example, you might have a "2-inch pipe," which refers to the nominal OD, but the actual OD and wall thickness can vary significantly based on the pipe's schedule (e.g., Schedule 40 or Schedule 80). Pipe sizes are standardized by industry standards.

* Tube : Tubes are specified by their actual dimensions, including both the outside diameter (OD) and the inside diameter (ID). This makes tube dimensions more precise and consistent. Tubes are often used where tight tolerances are critical, such as in mechanical and structural applications.

3. Applications :

* Pipe : Pipes are primarily used for conveying fluids under pressure, such as water, gas, oil, and chemicals. They are commonly used in plumbing, pipelines, and industrial applications where the flow of fluids is the primary consideration.

* Tube : Tubes are used in a wider range of applications, including structural components, mechanical and hydraulic systems, heat exchangers, and instrumentation. Tubes are often chosen for their precision dimensions and strength, making them suitable for various mechanical and structural purposes.


4. Strength and Durability :

* Pipe : Pipes are designed to withstand higher pressures and are often thicker and more robust compared to tubes. They are engineered for the safe transportation of fluids under various conditions.

* Tube : Tubes can vary in thickness and strength depending on the specific application. Some tubes are designed for high strength, while others are optimized for heat transfer or precision in mechanical systems.
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