In real life, pipes are used in water conservancy, electricity, municipal administration, oil, natural gas, irrigation and other aspects, but there are many types of pipes, including ABS pipes, PVC pipes, PEX pipes, HDPE pipes, etc. How should we choose? What are the differences between pipes of different materials and what are the differences in connection methods? Let's talk about the differences between them.
ABS pipes are mainly used for downpipes of sanitary ware, gas pipelines, sewage pipes, underground cable pipes and high-corrosion industrial pipelines. It has excellent corrosion resistance, light weight, and higher heat resistance than PE and PVC, but the price is more expensive.
PVC pipes are widely used in drainage, electrical, postal and telecommunications pipes and pipe fittings, various plates, sheets, profiles, etc. It has good mechanical properties, excellent acid and alkali resistance and chemical stability. It is a widely used general-purpose plastic, but it is not resistant to high temperatures. PEX pipes (polyethylene cross-linked pipes) are often used for water supply pipes, hot and cold water pipes, heating pipes, etc. It has good corrosion resistance, pressure resistance and long service life, and is an important material in modern piping systems.
ABS pipe connection method
The main connection methods of ABS pipes are as follows: socket bonding, threaded connection and flange connection. These methods have their own characteristics and are suitable for different application scenarios.
Socket bonding is a common connection method suitable for ABS plastic pipes. This method connects pipe fittings and pipes together through adhesives, and has the advantages of simple operation and good sealing.
In addition to socket bonding, ABS pipes can also be connected by threaded connection and flange connection. Threaded connection is suitable for pipes with small diameters, and sealing is achieved through threaded connection.
Flange connection is suitable for pipe connections that require frequent disassembly or under high pressure environments, and connection is achieved through flanges and bolts.
PVC pipe connection method
Solvent bonding method: Use special PVC solvent glue to dissolve and bond the interface parts of the pipe and pipe fittings together. After bonding, a strong chemical bond will be formed at the interface, making the connection very strong. This method is suitable for PVC pipes with smaller diameters, and the interface after connection has good sealing and pressure resistance.
Rubber sealing ring connection method: There is a groove inside the pipe fitting for placing the rubber sealing ring. When the PVC pipe is inserted into the pipe fitting, the sealing ring can provide a good sealing effect and can also withstand a certain amount of pressure. The firmness of this connection method depends on the quality of the sealing ring and the accuracy of the installation, and is usually suitable for PVC pipes with larger diameters.
Mechanical connection method: Including threaded connection, clamp connection, etc. The PVC pipe and the pipe fitting are fixed together by mechanical force, without the need for solvents or sealing rings. The firmness of mechanical connection is very good, especially in occasions where frequent disassembly and installation are required. However, the cost of this method is relatively high, and certain techniques and tools are required for installation.
PEX pipe connection method
Hot melt connection: Use a special heating tool to heat the polyethylene pipe or pipe fitting to be connected under pressure, melt it, remove the heating tool, apply pressure to connect the two molten surfaces together, and keep it under stable pressure for a period of time until the joint cools down.
Electrofusion connection: Use a special electric fusion pipe fitting with embedded resistance wire to make close contact with the connection part of the pipe or pipe fitting, and heat the connection part through the embedded resistance wire to melt it into one, until the joint cools down.
Socket-type flexible connection: It is a new type of connection method developed based on the socket-type flexible connection principle of cast iron pipes and polyvinyl chloride pipes (PVC U). It welds a reinforced polyethylene socket at one end of the polyethylene pipe.
Flange connection: It is mainly used for the connection of polyethylene pipes with metal pipes or valves, flow meters, pressure gauges and other ancillary equipment.
ABS pipe
ABS pipe has the following advantages:
Good impact resistance: It has good mechanical strength and high impact toughness, and only deforms ductilely when it is suddenly attacked.
Low flow friction: It greatly reduces fluid resistance and pump horsepower, and is suitable for applications requiring high flow.
Wide range of application: It is mainly used in industries such as pharmaceuticals and food, and will not cause secondary pollution. It can generally be used for decades indoors, and it will have a longer life when buried underground or in water.
The disadvantages of ABS pipe include:
Higher price: It is more expensive than PVC pipe.
Poor gas permeability resistance: It is not suitable for applications that require gas isolation.
PVC pipe
The characteristics of PVC pipe are as follows:
Low price: Compared with other plastic pipes, PVC pipes are cheaper.
Strong corrosion resistance: It has good chemical corrosion resistance and is suitable for a variety of chemical media.
Wide application: It is mainly used for protective pipes for wires and cables, drainage, wastewater, chemicals, heating liquids and coolants, etc.
The disadvantages of PVC pipes include:
Low temperature brittleness : It is brittle at low temperatures and easy to break .
Poor thermal stability : The long-term use temperature cannot exceed 45°C, otherwise it will decompose and release hydrogen chloride .
PEX pipes
The characteristics of PEX pipes are as follows:
High temperature resistance : It can withstand higher water temperatures and is suitable for hot water pipe applications .
Chemical corrosion resistance : It has good chemical stability and is suitable for a variety of chemical media .
Long service life : At rated temperature and pressure, the service life of PEX pipes can reach more than 50 years .
The disadvantages of PEX pipes include:
Non-recyclable : Once damaged, it is difficult to recycle .
High installation requirements : Professional installation tools and skills are required, otherwise it may affect the use effect
