Three Connection Methods for Large-Diameter Spiral Steel Pipes in Industrial Projects

The most common connection method for large-diameter spiral steel pipes is welding. However, threaded connections, flange connections, socket connections, and grooved connections are also frequently used in some projects.

First, Welding and Flange Connections for Large-Diameter Spiral Steel Pipes.

Welding and flange connections are traditional spiral steel pipe connection methods. However, they no longer meet market demands in terms of safety, sealing performance, cost, and emergency repair efficiency.

Applicable Scope: Water pipeline connections, oil and gas pipeline connections, chemical pipeline connections, and power pipeline connections.

Second, Grooved Fitting Connections for Large-Diameter Spiral Steel Pipes.

Grooved fitting connection technology, also known as clamp connection technology, has become the preferred technology for liquid and gas pipeline connections. Although its development in China lagged behind that abroad, its advanced technology led to its rapid acceptance in the domestic market. The application of grooved fitting connection technology simplifies, speeds up, and facilitates complex pipeline connection procedures, representing a significant step forward in pipeline connection technology.

Grooved pipe fittings comprise two main categories:

① Steel pipe fittings used for connection and sealing include rigid joints, flexible joints, mechanical tees, and grooved flanges;

② Steel pipe fittings used for connection and transition include elbows, tees, crosses, reducers, blind flanges, and spiral welded pipes. Grooved pipe fittings used for connection and sealing mainly consist of three parts: a sealing rubber ring, a clamp, and locking bolts. The inner rubber sealing ring is placed on the outside of the pipe being connected and matches the pre-rolled groove. The clamp is then fastened onto the outside of the rubber ring and finally secured with two bolts. Due to the unique sealable structural design of its rubber sealing ring and clamp, grooved fittings have excellent sealing performance, which increases with the pressure of the fluid inside the pipe.

Grooved connections simplify pipe connection operations, improve construction safety, ensure good system stability, facilitate maintenance, and save labor and time, thus offering good economic benefits. Although the individual clamp component is more expensive, the overall efficiency of the entire pipe network installation is higher than that of flange connections. Scope of Application: Liquid and gas pipeline connections

Third, Large-Diameter Spiral Steel Pipe Connection Method: Clamp Fitting Connection.

Clamp fitting connection, as an advanced pipeline connection method, can be installed both exposed and buried, and includes both rigid and flexible joints. Therefore, it has a wide range of applications.

By System Classification: It can be used for fire protection water systems, air conditioning hot and cold water systems, water supply systems, petrochemical pipeline systems, thermal power and military pipeline systems, sewage treatment pipeline systems, etc.

By Steel Pipe Material Classification: It can be used to connect steel pipes, stainless steel pipes, plastic-lined steel pipes, ductile iron pipes, thick-walled plastic pipes, and flexible fittings with steel pipe joints and flange joints.

Scope of Application: Water transmission pipeline connection, oil and natural gas pipeline connection, chemical pipeline connection, thermal power and military pipeline connection