As an indispensable part of modern buildings, PVC (polyvinyl chloride) pipes have been widely used in water supply and drainage, cable protection, heating, ventilation and air conditioning (HVAC) systems and other fields due to their excellent performance, economical cost and wide applicability. This article will discuss the relevant knowledge of PVC pipe for building in detail from the aspects of the characteristics, uses, types, installation methods and maintenance points of PVC pipes.
PVC pipe for building is a pipe made of polyvinyl chloride resin as the main raw material, by adding an appropriate amount of stabilizer, lubricant and plasticizer. This pipe has become a commonly used material in construction projects due to its durability, lightness and economy. It is mainly used to transport liquids, gases or provide protection for cables.
There are many types of PVC pipes for construction, including:
1. PVC pipes for water supply and drainage: mainly used for water supply and drainage systems of buildings.
2. Cable protection pipes: used to protect wires and cables in buildings.
3. HVAC pipes: used as condensate discharge or air flow delivery pipes in air conditioning and ventilation systems.
1. Strong corrosion resistance
PVC pipes have good resistance to acid, alkali and salt chemicals and are not easily corroded. They are suitable for conveying corrosive liquids or for use in humid environments.
2. Light weight and easy installation
Compared with metal pipes, PVC pipes are lighter in weight, easier to transport, handle and install, and can significantly reduce construction costs and time.
3. High mechanical strength
PVC pipes for construction have good impact resistance and compression resistance and can withstand external forces during construction and use.
4. Excellent insulation performance
PVC pipe is an insulator and does not conduct electricity, making it ideal for protecting wires and cables.
5. The inner wall is smooth and the fluid resistance is small
The inner wall of the PVC pipe is smooth, which reduces friction resistance when conveying water and helps improve fluid conveying efficiency.
6. Long service life
Under normal use conditions, the service life of PVC pipes can reach more than 50 years with low maintenance costs.
7. Environmentally friendly and recyclable
PVC materials can be recycled and will not cause serious pollution to the environment after being discarded.
1. Water supply system
PVC pipes are widely used in cold water supply pipe systems inside and outside buildings. They are popular because of their non-toxicity, corrosion resistance and smooth inner wall.
2. Drainage system
PVC drainage pipes are used for kitchen, bathroom and rainwater discharge. They have the advantages of dirt resistance and non-clogging.
3. Cable protection
In buildings, PVC pipes are used in cable protection pipe systems to prevent cables from external mechanical damage and humid environments.
4. HVAC system
PVC pipes can be used as air conditioning condensate discharge pipes or auxiliary pipes in ventilation systems.
5. Agricultural irrigation and gardening systems
In the greening projects of buildings, PVC pipes can be used as water supply pipes for irrigation systems.
6. Sewage treatment pipes
In sewage treatment or industrial wastewater discharge in some buildings, PVC pipes are widely used because of their corrosion resistance.
Classification by use
UPVC pipe (rigid polyvinyl chloride pipe): commonly used in water supply and drainage systems and cable protection.
CPVC pipe (chlorinated polyvinyl chloride pipe): better heat resistance, can be used to transport hot water.
PVC drainage pipe: usually large diameter, used for drainage and rainwater pipes.
PVC electrical pipe: specially used to protect cables, common ones are PVC threading pipes.
Classification by specification
Outer diameter size: ranging from 16mm to 630mm, the specific choice depends on the design requirements.
Wall thickness grade: according to different pressure requirements, it is divided into SCH 40, SCH 80 and other specifications.
Length: standard length is usually 3 meters or 6 meters, and can also be customized according to project requirements.
1. Preparation before installation
Check whether the pipe has cracks, deformation and other problems to ensure that the product meets the design requirements.
Clean the dirt and dust on the surface of the pipe to ensure that the connection is clean and free of impurities during installation.
2. Cutting and deburring
Use a special pipe cutting tool to cut the PVC pipe according to the designed length.
After cutting, use sandpaper or a deburring tool to clean the cut to ensure that the cut is flat and smooth.
3. Connection method
Glue bonding: Apply PVC special glue evenly inside and outside the pipe socket and socket, insert and rotate quickly, and keep it for a certain time to ensure that the bonding is firm.
Threaded connection: Some threaded PVC pipes are suitable for detachable connection methods and are often used for electrical pipes.
Flange connection: Flanges are often used for connection in large-diameter pipes, which is convenient for disassembly and maintenance.
4. Fixing and support
Use pipe clamps or brackets to fix the PVC pipe in the designed position to avoid loosening due to thermal expansion and contraction or external force.
When installed horizontally, the pipe support spacing should not exceed 1 meter; when installed vertically, a support point should be set every 1.5 meters.
5. Pressure test
After the water supply and drainage pipes are installed, pressure tests should be carried out to ensure that there are no leakage or cracking problems in the pipes.
PVC pipe for building has become an indispensable and important pipe material in modern buildings with its excellent performance, economy and wide applicability. From water supply and drainage to cable protection, from HVAC systems to sewage treatment, the versatility of PVC pipes meets various needs in construction projects. When purchasing and installing, the appropriate specifications and types should be selected according to the actual use, and the standardized construction and maintenance methods should be followed to ensure the long-term and stable operation of the pipeline system.
