In modern construction and municipal engineering, PVC (polyvinyl chloride) drainage pipes have become one of the most widely used pipes in drainage systems due to their advantages such as lightness, corrosion resistance, and easy installation. Whether in residential, commercial buildings or industrial facilities, PVC drainage pipes are widely used in drainage, sewage and rainwater discharge systems. Choosing the right PVC drainage pipe sizes is the key to ensuring the normal operation of the drainage system. This article will explore in depth the selection, standard specifications and precautions for installation of PVC drainage pipe sizes.
PVC drainage pipes can be divided into many types according to their uses and performances, among which the most common ones are water supply and drainage pipes, rainwater pipes, sewage pipes, etc. The specifications of PVC drainage pipes are usually divided according to the outer diameter, wall thickness and pressure level of the pipe. Its standard size range is usually:
Outer diameter: generally ranging from 16mm to 630mm, common sizes include: 50mm, 75mm, 100mm, 150mm, 200mm, 250mm, etc.
Wall thickness: According to different pressure levels and usage environments, the wall thickness of PVC pipes usually has multiple standards, such as S (thin wall), M (medium wall), H (thick wall), etc., to adapt to different pressure requirements and usage scenarios.
According to different usage occasions, PVC drainage pipe sizes need to be reasonably selected based on factors such as water flow, drainage slope, and pipeline layout.
1. Drainage volume and water flow rate: PVC drainage pipe sizes must be able to accommodate the expected water flow. If the pipe size is too small, it will lead to poor drainage and even cause pipe blockage; if the pipe size is too large, it may cause the water flow rate to be too slow, and cement deposition or dirt accumulation in the pipe may occur easily.
2. Pipeline slope: The slope of the drainage pipe is an important factor affecting drainage efficiency. A reasonable slope can ensure smooth water flow. In horizontal pipes, a slope of 1% to 2% is usually designed, which means that the height of the pipe is reduced by 1 to 2 meters for every 100 meters. A slope that is too small will lead to poor drainage, while a slope that is too large may cause the water flow rate to be too fast and increase pipe wear.
3. Pipeline pressure bearing capacity: Different drainage pipes have different pressure bearing levels according to the needs of the place of use. PVC drainage pipes are usually divided into different categories according to the pressure level. When choosing the pipe size, in addition to considering the water flow rate, it is also necessary to select the appropriate specifications according to the pressure requirements of the pipe.
4. Pipe connection method: There are many ways to connect PVC drainage pipes, and the common ones are welding, threaded connection, and socket connection. Different connection methods may affect the internal space of the pipe, thereby affecting the flow rate. The design of the connection parts needs to be precise to avoid leakage or blockage caused by improper connection.
5. Construction environment and service life: PVC drainage pipes adapt to different environmental conditions, such as indoor and outdoor temperature differences, humidity, soil pH, etc. Therefore, when selecting the size of PVC drainage pipes, it is also necessary to consider the environmental pressure that may be encountered in long-term use and ensure the long-term stability of the pipes in harsh environments.
1.50mm and 75mm sizes: This small-diameter PVC pipe is often used in small drainage systems in residential buildings, such as sinks, washing machine drainage, etc. Due to the small water flow, 50mm and 75mm pipes are sufficient to meet the needs. It is necessary to ensure the appropriate slope during installation to ensure smooth water flow.
2.100mm size: 100mm PVC drainage pipe is often used in the sewer system of ordinary residences and is one of the most common sizes. It is suitable for discharging domestic sewage, rainwater, etc. and can carry a certain amount of water flow. It is generally used in the main drainage pipes of family residences.
3.150mm and 200mm sizes: These medium-diameter PVC drainage pipes are mostly used in the drainage systems of public facilities such as commercial buildings, schools, and hospitals, and are suitable for handling larger drainage volumes. They are usually used as main drainage pipes to connect multiple branch pipes. When designing larger-sized pipes, special attention should be paid to the drainage speed to avoid sewage sedimentation caused by slow water flow.
4.250mm and above: PVC drainage pipes above 250mm are usually used in industrial areas, large shopping malls, urban rainwater drainage systems and other places. Its main function is to discharge large amounts of rainwater and sewage. Due to its larger diameter, these pipes need to have strong pressure bearing capacity and corrosion resistance.
According to relevant Chinese standards, the selection of PVC drainage pipes should follow the following main standards:
GB/T 5836-2016 "PVC Drainage Pipes and Fittings for Buildings"
GB/T 19472-2004 "PVC-U Building Drainage Pipe System"
CJ/T 273-2010 "PVC Pipes for Building Water Supply and Drainage"
These standards and specifications provide detailed regulations on the material, size, pressure rating, connection method, and use environment of PVC drainage pipes. These standards must be followed during construction to ensure the safety and stability of the drainage system.
Selecting the right PVC drainage pipe sizes is the key to ensuring the normal operation of the drainage system. Too small a size may cause pipe blockage, while too large a size wastes resources and may cause poor water flow. When selecting, it is necessary to comprehensively consider multiple factors such as water flow, pipe slope, pressure bearing capacity, and construction environment. By reasonably selecting the size of the drainage pipe, drainage efficiency can be improved and maintenance costs can be reduced, thereby providing a stable and efficient drainage system for the building.
