The main component of PVC is made of polyvinyl chloride. Besides, other ingredients will be added to enhance its toughness, heat resistance and ductility. PVC is a very popular and versatile synthetic material on the market. PVC is often used in piping systems for domestic and various industrial purposes. The PVC pipe mainly has three layers. The top layer is a layer of paint film, which has a waterproof effect; the middle layer is a polyvinyl chloride layer; and the lower layer is a back-coated adhesive.
Schedule 40 & Schedule 80
According to the thickness of the pipe wall, the two most commonly used types of PVC pipe thickness are Schedule 40 and Schedule 80. In terms of numbers, the pipe wall of Schedule 80 is thicker than that of Schedule 40. By analogy, the larger the number, the thicker the tube wall.
PVC pipes with different wall thicknesses are suitable for applications with different temperatures and pressures. The color of SCH40 PVC pipes on the market is usually white. Because of its thinner pipe wall, it can withstand lower pressure and temperature, so it is suitable for pipe use in building drainage systems. The color of PVC pipes of SCH80 is mostly gray. Its tube wall is thick, so it is suitable for conveying materials with higher pressure or higher temperature.
Types of PVC pipe
PVC pipe can be divided into PVC-U pipe, CPVC pipe, PVC-O and PVC-M pipe. Rigid polyvinyl chloride pipe is made of polyvinyl chloride resin, stabilizer, lubricant, etc., and then extruded by hot pressing.
PVC-U
Since there is no plasticizer added to the PVC-U pipe, its texture is very hard and is called rigid PVC. This kind of pipeline has strong corrosion ability, light weight, low price and easy bonding. But it can only deliver liquids with a temperature lower than 45°C. PVC-U pipe is the most common type of PVC pipe on the market. It is often used for industrial applications such as conveying wastewater, gas, chemicals, mud, and compressed air. Besides, PVC-U pipe is also the safest pipe choice for transporting drinking water.
CPVC
CPVC pipes are suitable for industrial applications that need to be subjected to high pressure and high temperature and have high mechanical strength. Compared with PVC-U pipes, CPVC can withstand temperatures up to about 90°C. The reason why CPVC pipe can withstand higher temperatures is because its chlorine content is higher than PVC-U pipe, about 63-69% (general PVC-U pipe has only 56.7% chlorine content). This type of pipeline has high corrosion performance and very high durability. C-PVC pipes can also be used to transport drinking water. CPVC pipe is a green industrial material. Its advantages are mainly fireproof, low thermal conductivity and low heat loss. It is often used as a water pipe system in commercial buildings or residential buildings.
PVC-O
PVC-O pipe is a new type of pipe on the market. It is a pipe made by a special orientation process. Mainly in the process of processing, the formed PVC-U pipe is stretched axially and radially, so that the long-chain PVC molecules in the pipe are arranged in biaxial way, so that the pipe wall is relatively thin. As the PVC-O pipe reduces the pipe wall by 35% to 40% compared with the PVC-U pipe, it reduces the cost and saves the manufacturing material. The impact strength of the pipe after biaxial stretching has also increased by more than 10 times. This type of pipeline has high strength, corrosion resistance and high toughness properties. PVC-O pipes are widely used in groundwater systems drinking water applications and etc.
PVC-M
PVC-M refers to modified polyvinyl chloride pipe. After the modification, the toughness, impact performance and crack resistance of PVC-M are increased. The characteristic is that the material itself is under less pressure. Compared with PVC-U, the seismic performance of PVC-M pipe is better than that of PVC-U. PVC-M is often used in industrial applications such as groundwater systems and irrigation systems.
What are the main advantages and disadvantages of PVC pipes?
Advantage:
1. The pipe wall is smooth, so the fluid resistance is small and the water delivery capacity is good.
2. It has good corrosion resistance and does not require any anti-corrosion treatment.
3. Good compressive and tensile strength.
Disadvantages:
1. Not suitable for use as a pipeline for transporting fluids with higher temperature.
2. When subjected to a strong impact, it is easily damaged.
The characteristics of PVC Drainage Pipes and its application
In the current market, PVC drainage pipes are widely used in various industries. PVC drainage pipe has strong heat resistance and corrosion resistance. PVC drainage pipe has good physical properties. Because its inner wall is smooth, the frictional resistance is smaller than that of ordinary drain pipes. At the same time, PVC drainage pipes are lighter and easy to transport and operate. The main connection method is to use glue connection, which can facilitate installation and later maintenance. Since the price is lower than other drainage pipes, it can save a lot of costs in engineering. Coupled with its good corrosion resistance. All of the above reasons make PVC pipes be widely used in various construction sewage and rainwater pipeline systems.
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