Carbon steel seamless pipe expansion connection

The expanded connection primarily utilizes malleable cast iron or ductile iron, consisting of key components such as a lined pipe body (bushing), nuts or bolts, threaded rings or expanded pressure flanges, and sealing rubber rings. This connection method uses fastening nuts or pressure flanges to compress the sealing ring. This ensures that the inner surface of the pipe and the sealing ring on the lining pipe are securely connected to the metal pipe fittings, forming a reliable diagonal sealing connection.

Advantages of Carbon Steel Seamless Pipe (CS SMLS Pipe) Expansion Connection:

- Mechanical Properties
The pipe end at the flared interface expands into a bell shape. The dimensions of the inner liner and the pipe fitting's inner diameter are aligned with the nominal diameter of the pipe, ensuring no reduction in diameter at the connection. This design prevents any impact on fluid flow and minimizes local head loss, enhancing the overall flow efficiency.

- Sealing Characteristics
The flared interface provides a secure seal through crimping of the beveled inner side. This design prevents fluid from leaking out of the pipe's end face, thus protecting the pipe from end-face corrosion. It also prevents damage to the multi-layer structure of carbon steel seamless pipes, avoiding what is commonly known as the "tearing cloth effect."

- Installation Performance

Ease of Installation: The expanded connection interface is user-friendly, enabling quick and easy installation and disassembly. It also supports repeated assembly and dismantling, and is suitable for long insertion construction projects.

Immediate Operation: Once connected, the pipe is ready for transporting media without waiting for cooling or other preparations, making it ideal for pipes undergoing decoration, modifications, or updates.

Flexibility: The flared connection does not impose special requirements on the installation or working environment.

Durable and Reliable: The flaring process permanently deforms the pipe into a bell shape, and the use of tightening nuts or flanges ensures a strong, reliable connection with the lining pipe. The sealing rubber rings are positioned for oblique side sealing, offering excellent pull-out resistance. No anti-slip measures are needed, simplifying construction and reducing costs.

Simple Installation: The nut or bolt fastening method is straightforward, making the entire process easy to execute.

- Pressure-Bearing Properties
The flared interface pipe fittings are made from metal, matching the pipe’s pressure-bearing capacity. This ensures that the connection maintains the same pressure and diameter as the pipe, without any reduction in performance.

Disadvantages of the Flared Connection:

- Position Limitations:

The flared connection requires one part to be inserted into another, which limits the flexibility of part positioning during installation.

- Sealing Challenges:

Due to the interlocking nature of the connection, the sealing performance may be weaker, leading to potential leakage and other sealing issues.

- Strength Limitations:

Compared to other connection methods, flared connections may have limited strength. Under high stress or heavy loads, there is an increased risk of fatigue fractures or other structural failures.