Product Description
PVC-U drainage pipes are a technically mature product series that has been widely adopted both domestically and internationally. These products offer advantages such as unmatched longevity and corrosion resistance compared to cast iron pipes. In terms of installation, they are lightweight, easy to transport and install, and feature simple connections. They are widely used in drainage and sewage systems for residential buildings, chemical plants, and stormwater management. PVC-U drainage pipes and fittings comply with the standard requirements of GB/T5836.1-2018 and GB/T5836.2-2018. The product range includes three types: straight pipes, flared-end pipes, and bell-end pipes, allowing for a variety of pipe connection methods. In addition, the company has developed pressure drainage pipes for stormwater and aesthetically pleasing square downspouts for stormwater drainage design and engineering in various buildings; it has also developed a series of drainage pipes designed to reduce drainage noise, including spiral silencer pipes, hollow spiral silencer pipes, and hollow-wall silencer pipes.
Product Features
- The pipes feature excellent surface hardness and tensile strength, ensuring a high safety margin.
- It offers excellent resistance to aging and has a typical service life of over 50 years.
- The pipes offer excellent corrosion resistance to inorganic acids, alkalis, and salts, making them suitable for the discharge and conveyance of industrial wastewater.
- The pipes have a low friction coefficient, allowing water to flow smoothly; they are resistant to clogging and require minimal maintenance.
- The material has a high oxygen index and is self-extinguishing.
- The pipe has a low coefficient of linear thermal expansion (0.07 mm/m·°C), resulting in minimal deformation due to temperature changes. With low thermal conductivity and elastic modulus, it offers superior freeze resistance compared to cast iron drainage pipes.
- Pipes and fittings can be joined using adhesive bonding, which offers a simple installation method, is easy to perform, and results in high installation efficiency.
- This product is suitable for indoor and outdoor drainage piping systems in industrial and residential buildings, where the continuous discharge temperature of domestic wastewater does not exceed 40°C and the instantaneous discharge temperature does not exceed 80°C; it is also suitable for industrial wastewater that does not corrode the piping material.
Performance Specifications for Drainage Pipes
Project | Indicators |
Density, kg/m³ | 1350-1550 |
Vicat Softening Temperature, ℃ | ≥79 |
Longitudinal Shrinkage, % | ≤5 |
Dichloromethane Immersion Test | Surface finish is no worse than 4L |
Tensile Yield Strength, MPa | ≥40 |
Drop Weight Impact Strength, TIR | ≤10％ |
Watertightness Test | No leaks |
Leak Test | No leaks |
Performance Specifications for Drainage Fittings
Project | Indicators |
Standards | GB/T 5836.2-2018 |
Appearance | The inner and outer surfaces of the fittings shall be smooth and even, with no bubbles, cracks, obvious scratches, dents, uneven coloration, or discoloration lines. The fittings shall be intact with no defects; gates and flash shall be trimmed smooth, and the color shall be white. |
Vicat Softening Temperature, ℃ | ≥70 |
Oven Test | The specimen shall show no signs of blistering, cracking, or cracking along the weld line; defects not exceeding 50% of the wall thickness at the injection point are permitted; and cracks that do not penetrate the entire wall thickness are permitted at the weld line. |
Drop Test | No cracks |
Pipe Connections
Socket Joints for Pipes Must Be Made Strictly in Accordance with the Following Procedure:
- Before making a bonded joint, wipe the pipe socket and the fitting’s receiving end clean.
- Measure the socket depth and mark the pipe end accordingly.
- Apply the adhesive, starting with the socket and then the spigot, ensuring an even and moderate coating.
- Align the tool, insert it into the marked area in one smooth motion, and turn it a quarter turn.
- Wipe off any adhesive residue from the socket.
- Let the bonded pipes sit until the joint has cured.
The Following Regulations Must Be Observed to Ensure the Safe Use of Adhesives:
- Adhesives and cleaning agents should be used immediately after opening; non-authorized personnel are prohibited from handling them.
- No open flames are permitted at the bonding site, and the area must be well ventilated.
- Do not perform installation work at temperatures below -10°C, and do not apply heat to the bonding areas.
- Workers should wear gloves. If the adhesive gets into the eyes, rinse immediately with plenty of water and seek medical attention.
Installation Instructions
Pipe Cutting and Bevelling:
The length of the cut pipe should be determined on a layer-by-layer basis based on actual measurements and in conjunction with the dimensions of the connecting fittings. For cutting the pipe, tools such as a fine-toothed saw, a pipe cutter, or a pipe-cutting machine should be used. The cut surface should be smooth, with no deformation at the cross-section. The socket end to be joined may be chamfered to a 15°–30° bevel using a medium-grit file. The bevel length should generally be no less than 3 mm, and the bevel depth should be 1/3 to 1/2 of the pipe wall thickness. After beveling, all debris must be thoroughly removed.
Protection of Socket Joints:
After connecting the socket joints, wipe away any excess adhesive with cotton yarn or a dry cloth dipped in a small amount of acetone or another suitable cleaning agent. Allow the joints to cure undisturbed, taking into account the adhesive’s properties and weather conditions. During winter construction, the curing time should be appropriately extended.
