Fiberglass reinforced plastic (FRP) pipes, as a common non-metallic pipeline material, have been widely used in fields such as chemical, petroleum, water conservancy, and municipal construction due to their excellent corrosion resistance, lightweight, high strength, and aging resistance. In practical engineering, there are various connection methods for fiberglass pipelines, each with its specific applicable scenarios and advantages and disadvantages. The following is a detailed explanation of the main connection methods for fiberglass pipelines:

FRP tube

1、 Flange connection

Flange connection is a common connection method in fiberglass pipelines, especially suitable for large-diameter pipelines and situations that require frequent disassembly. There are two main forms of flange connections:

1. Molded fiberglass flange connection: In this method, molded fiberglass flanges are installed on both sides of the pipeline, and the pipeline is tightly connected to the flange with adhesive. This connection method has the advantages of simple structure, easy installation, and good sealing, and is suitable for pipeline connection under general working conditions.
2. Metal split type sleeve flange connection: Another form is to use fiberglass and metal material to directly connect the split type sleeve flange. Usually, in the pipeline manufacturing process, one end of the pipeline is reserved to match the flange, and then the two flanges are tightly fixed together with bolts. This method combines the strength of metal flanges with the corrosion resistance of fiberglass pipelines, making it suitable for pipeline connections under harsh conditions such as high pressure and high temperature.

2、 Threaded connection

Threaded connections are suitable for small diameter fiberglass pipes. By setting internal and external threads at both ends of the pipeline, and then using threaded connectors or threaded joints to screw the threads of the two pipelines together, a connection is formed. This connection method is simple to operate, easy to disassemble and repair, but it should be noted that threaded connections require high precision in thread processing to ensure the sealing and firmness of the connection.

3、 Hot melt connection

Hot melt connection is a method of quickly connecting two ends of a pipeline together by melting them with heat. For fiberglass pipelines, hot melt connections usually require the use of specialized hot melt welding machines for operation. This connection method is suitable for situations where the diameter is small, the pipeline wall is thin, and anti-seepage is required. The advantages of hot melt connection are high connection strength and good sealing, but the operation is difficult and requires professional equipment and technical personnel to operate.

4、 Adhesive connection (including sleeve bonding, socket bonding, flat mouth bonding, etc.)

1. Sleeve bonding connection: Apply adhesive to the top of the pipeline and the sleeve, then wrap the sleeve over the pipeline and tightly wrap it around the interface with a cloth tape to wait for natural drying. This connection method is simple and fast, suitable for situations where the connection strength is not high.
2. Socket bonding connection: One end of the fiberglass pipe is made into a conical plug, and the other end is processed into a conical groove. Then, the plug is inserted into the groove and adhesive is applied to the surface of the socket or the outer surface of the socket. A glass cloth tape soaked in adhesive is tightly wrapped around the bonding area and left to dry naturally. This connection method has good sealing performance and is suitable for pipelines with small diameters that require sealing.
3. Flat mouth adhesive connection: Apply adhesive directly to the end of the steel pipe for docking, and then wrap glass cloth tape around the adhesive seam. This connection method is easy to operate, but attention should be paid to the selection of adhesive and the uniformity of application to ensure the sealing and firmness of the connection.

5、 Plug in connection

Plug in connection is the process of making one end of a fiberglass pipeline into a conical or other shape, and processing the other end into a slot or socket, then plugging the two together and sealing them with sealing material. This connection method is suitable for pipeline systems with small diameters and certain requirements for sealing. Plug in connections have the characteristics of easy installation and disassembly, but attention should be paid to preventing loosening or leakage at the plug connection during use.

What are the connection methods for fiberglass pipes? What types have you used? There are various connection methods for fiberglass pipelines, and the specific choice should be comprehensively considered based on factors such as pipeline diameter, usage environment, installation conditions, and engineering requirements. During the connection process, it should be ensured that the connection is firm and the sealing is good to ensure the normal operation and long-term effectiveness of the pipeline system.

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