Pipe inserts are cylindrical devices inserted into pipes to serve various purposes such as reinforcement, support, alignment, or protection. They are commonly used in plumbing, HVAC (Heating, Ventilation, and Air Conditioning) systems, and other piping applications. Pipe inserts come in different materials such as plastic, metal, or composite materials, depending on the specific requirements of the application.

Here are some common types and purposes of pipe inserts:

1. Pipe Support Inserts: These inserts are used to provide structural support to pipes, especially in applications where pipes are subjected to heavy loads or vibrations. They help prevent sagging or bending of the pipes.

2. Alignment Inserts: Alignment inserts are used to ensure proper alignment of pipes during installation. They help maintain straightness and prevent misalignment, which can lead to leakage or inefficiency in the system.

3. Anti-Corrosion Inserts: In corrosive environments, pipe inserts made from corrosion-resistant materials such as stainless steel or plastics can be used to protect the inner surface of the pipe from corrosion, extending its lifespan.

4. Flow Control Inserts: These inserts are designed to improve the flow characteristics of the pipe by reducing turbulence or controlling the direction of flow. They can be used to optimize the performance of the piping system.

5. Thermal Insulation Inserts: In HVAC systems or applications where thermal insulation is required, pipe inserts made from insulating materials can be used to reduce heat transfer and prevent energy loss.

6. Sound Damping Inserts: For applications where noise reduction is important, sound-damping pipe inserts can be used to absorb or dampen the sound generated by flowing fluids within the pipe.

Overall, pipe inserts play a crucial role in enhancing the performance, durability, and efficiency of piping systems across various industries. The specific type of insert used depends on the application requirements, such as pipe material, size, operating conditions, and environmental factors.