There are many connection methods for steel-plastic composite pipes, and different connection methods are selected according to different use environments and requirements. The following are some common connection methods:
1. Welding connection: Cut both ends of the steel-plastic composite pipe and connect them by welding. This method has a firm connection and is suitable for high-pressure, high-temperature and large-diameter pipes.
2. Threaded connection: Process both ends of the steel-plastic composite pipe into corresponding threads and connect them through threaded connection fittings. This method is easy to install and suitable for low pressure and small diameter pipes.
3. Flange connection: Process both ends of the steel-plastic composite pipe into flanges and connect them through flange fittings. This method has a firm connection and is suitable for high-pressure and large-diameter pipes.
4. Card sleeve connection: Process the two ends of the steel-plastic composite pipe to reduce the diameter and connect them through the card sleeve. This method is easy to install and suitable for low pressure and small diameter pipes.
5. Pipe clamp connection: Process both ends of the steel-plastic composite pipe to have the same diameter and connect them through pipe clamps. This method is easy to install and suitable for low pressure and small diameter pipes.
The above are several common connection methods for steel-plastic composite pipes. When selecting a connection method, it is necessary to make a reasonable selection based on the usage environment and requirements of the specific pipeline to ensure a strong and safe pipeline connection.

1. It can be determined according to the size of the steel-plastic composite pipe. If the specification does not exceed one hundred millimeters, threads can be used for connection. If the specification is between one hundred and two hundred millimeters, groove connection can be used. If the specification is between two hundred millimeters, mm or above, flange welding can be used. The specific connection method to be selected needs to be determined based on the actual conditions on site.
2. When connecting pipes and accessories, you should check whether the sealing ring in the broken shaft iron pipe fitting is in a sealed state. If there is a deviation in the sealing ring, it must be corrected immediately, otherwise many problems will occur later . Then we Screw the fitting onto the threaded end of the pipe by hand.
3. Next, confirm that the pipe fitting joint has been inserted into the plastic steel pipe, and then use pliers to connect the pipe and fittings. The exposed threaded parts after the pipes and fittings are connected, as well as the marks left by the pliers and the scratched parts on the surface, should be evenly applied Anti-rust sealant prevents rust in these places after oxidation.
4. After the sealant is evenly applied, you must pay attention to its maintenance. During the maintenance period, no pressure test can be performed. Here, it is still necessary to note that the high-speed composite pipe must not be directly connected to the valve and should be connected to the rapid, internal and external threads in the brass. During the connection process of the special transition pipe, if you are unable to operate it yourself, you need to ask professional personnel to help us.

Steel-plastic composite pipes generally use threaded connections, groove connections, and flange connections.
Various fields have different requirements for pipelines, and the determination of the connection method of steel-plastic composite pipes depends on the environment in which it is used. Generally speaking, threaded connections are used within 100 mm; grooved connections are used between 100 and 200 mm; flange welding is used above 200 mm. Different connection methods have different pressure-bearing capacities, so the pressure-bearing capacity must meet the needs. Be careful not to directly connect the steel-plastic composite pipe to the valve, special transition fittings with internal and external threads of brass with plastic lining shall be used.

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