Carbon steel seamless pipes (CS SMLS pipe) usually use threaded connections, flange connections, socket connections, welded connections, ferrule connections and other connection methods.
1. Threaded connection
Threaded connection is a common method of connecting seamless steel pipes. The connection is achieved by twisting the threads at both ends. Threaded connections have two forms: internal threads and external threads, which are suitable for some pipeline systems with small diameter, low pressure and small diameter. This connection method is simple, easy to implement and highly reliable, but the fasteners are susceptible to loosening due to external influences.
2. Flange connection
Flange connection is a detachable seamless steel pipe connection method. The flange consists of two parts with the same outline but different sizes. It is achieved by adding flanges to both ends of the pipe and connecting them to each other through bolts. Flange connections are widely used and are suitable for large diameter, high pressure and high temperature environments. The disadvantage of this connection method is that it is susceptible to leakage and loosening due to temperature changes and vibration.
3. Socket connection
Socket connection is one of the seamless steel pipe connection methods, also known as orifice connection. It is achieved by processing socket sleeves at both ends of the pipe. The advantage of socket connection is that it is easy to disassemble, replace and maintain, and is suitable for some systems that require easy disassembly. The disadvantage of this connection method is that it is more expensive and requires more complex tools for connection.
4. Welding connection
It is another commonly used connection method for seamless steel pipes. It means that the two butt ends are first beveled and then kept at a certain distance, and then welding agent is applied to the two end faces, and then the corresponding high-temperature sintering is performed. Welding connection method has lower cost, firm connection points, high safety and easy operation. It is suitable for some systems with large diameter, high pressure and no leakage, such as petroleum, chemical industry, electric power, natural gas, etc. The disadvantage of this connection method is that it requires high operating skills. If the welding is not done well, poor welding quality may easily occur.
5. Card sleeve connection
The ferrule connection is a seamless steel pipe connection method. It makes the two ends of the pipe into bayonet joints, and then presses the bayonet joints at both ends through the ferrule to achieve the connection. The card sleeve connection method has the advantages of simple and fast structure, no need for professional skills, easy operation, good sealing, safety and reliability, etc. It is suitable for some small diameter and low pressure systems. The disadvantage is that the connection points are susceptible to loosening due to external influences.
Other connection methods:
1. Rolling groove connection: suitable for pipe connections with specific requirements, which require precise control of the depth and width of the rolling groove.
2. Pressure connection: Pressure connection is a common connection method, suitable for high pressure and high temperature pipeline systems. It processes the end of the pipe into a tapered surface, and then performs pressure connection through special clamps and screws. Pressure connections have the characteristics of good sealing and strong pressure-bearing capacity, and are suitable for petroleum, chemical industry and other fields.
In summary, different seamless steel pipe (ASTM A106) connection methods have their own advantages and disadvantages, and they need to be selected based on specific needs in practical applications.
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