Connection method and scope of application of PPR pipe
Pipes often need to use different connection methods according to the occasion of use and material characteristics. The connection of the PPR pipeline adopts the method of hot melt, which is characterized by easy and fast operation and simple tools. And, since binding at the molecular level is possible, very reliable connections can be easily achieved by simply doing what is required. So what other commonly used connection methods? What are the characteristics of various connection methods?
1. Flange connection
Flange connection is to fix two pipes, pipe fittings or equipment on a flange plate, then add a flange gasket between the two flange plates, and finally tighten the two flange plates with bolts. A detachable joint which is tightly combined.
The main features of flange connection are easy disassembly, high strength and good sealing performance. Flange connections are often used for pipes with larger diameters. Flange connections are generally used in main road connecting valves, check valves, water meters, water pumps, etc., as well as pipe sections that need to be disassembled and repaired frequently.
2. Welding connection
Metal pipes are often connected by welding. Welding is a manufacturing process and technology for joining metals by heating, high temperature or high pressure. It is suitable for metal pipes, and is mostly used for concealed pipes and pipes with larger diameters. When the pipe diameter is less than 22mm, socket or sleeve welding should be adopted, and the socket should be installed facing the flow direction of the medium. When the pipe diameter is greater than or equal to 22mm, butt welding should be used.
The biggest problem with welding is the risk of causing corrosion, and the welded joints are prone to rust under long-term use. Welding quality is highly dependent on welding technology, and it is difficult to control the quality of pipe connections stably.
3. Threaded connection
The threaded connection adopts the method of tightening the two connectors with the inner and outer interfaces of the conical pipe thread, and the connection effect is achieved by the pressure sealing of the thread of the connection port. It is widely used in traditional galvanized steel pipes.
Threaded connections are suitable for galvanized steel pipes with a pipe diameter less than or equal to 100mm, and are mostly used for exposed pipes. Because the thread of the threaded connection often damages the surface of the galvanized layer, it is very easy to cause corrosion of the pipeline.
4. Socket connection
Socket connections are mainly used for cast iron pipes, concrete pipes, ceramic pipes, plastic pipes, etc. with socket joints. There are two types of flexible connections and rigid connections.
Rigid socket connection is to insert the socket of the pipe into the socket of the pipe. After alignment, use caulking material to caulk first, and then seal it with sealing material. The rigid connection is sealed with asbestos cement or expandable packing. It becomes a solid closed whole.
The flexible socket connection joint puts an elastic rubber ring on the seal stop of the pipe socket, and then applies force to insert the pipe spigot to form a closed pipe that can adapt to a certain range of displacement and vibration.
5. Groove connection
Grooved connection, also known as clamp connection, can be used for the connection of galvanized steel pipes with a diameter greater than or equal to 100mm in fire water, air conditioning hot and cold water, water supply, rainwater and other systems. It has the characteristics of simple operation, does not affect the original characteristics of the pipeline, safe construction, good system stability, convenient maintenance, labor-saving and time-saving.
6. Electrofusion connection
Electrofusion connection is generally a connection method used for welding PE pipes. By electrifying and heating the copper wire embedded in the inner wall of the pipe fittings, the plastic resin in the fusion zone undergoes a phase change, the polymer segments penetrate each other under a certain pressure, and are recrystallized and arranged by the cooling material to combine the fusion parts into a whole.
