How to connect two seamless steel pipes

Posted by chase Liu on December 29th, 2022

Seamless steel pipes have a hollow cross-section and are widely used as pipes for transporting fluids, such as pipes for transporting oil, natural gas, gas, water, and certain solid materials. Compared with welded steel tubes, seamless pipes are lighter in weight when they have the same flexural and torsional strength, and are an economical cross-section steel. Widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipes, automobile drive shafts, bicycle frames, and steel scaffolds used in construction, etc., use steel pipes to make ring parts. It can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing man-hours, and has been widely used in steel pipes.

There are many connection methods for seamless steel pipes, and several commonly used methods are listed below:
Compression type, union type, press type, push type, tapered thread type, socket welding type, union type flange connection, welding type and derivative series connection methods combining welding and traditional connection.

Different connection methods have different fields of application due to their different production principles, but generally speaking, they all have one thing in common, that is, easy installation, firmness and reliability.

The following is a brief introduction to several common connection methods:

1. Compression type: insert the pipe into the nozzle of the pipe fitting, tighten it with a nut, and use the screw force to compress the sleeve at the nozzle through the sealing ring, which acts as a seal and completes the connection of the pipe.

2. Welding type: The end of the pipe is processed with a bevel, and the pipe is welded circularly by manual or automatic welding.

3 Flange type: The flange and the pipe are welded by circular argon arc welding, and fastened with quick clips or bolts, so that the gasket between the flanges acts as a seal to complete the pipe connection.

4. Compression type: Insert the pipe into the pipe fitting and press the pipe wall into a hexagonal shape with a special installation tool, and the internal sealing ring is also deformed into a hexagonal shape

5. Tapered thread type: the outer thread and the pipe are welded by circular argon arc welding, and the inner threaded pipe fittings are connected by the tapered thread to seal and complete the pipe connection.