PVC Drainage Pipe

The conventional specifications of commonly used PVC drainage pipes are as follows: the nominal outer diameters are: 32mm, 40mm, 50mm, 75mm, 90mm, 110mm, 125mm, 160mm, 180mm, 200mm, 250mm, 315mm, 400mm, 500mm, 630mm, etc. The length of PVC-U pipe is generally 4m or 6m, and other lengths are determined through negotiation between the supply and demand parties.

Product Advantages

1. The surface hardness and tensile strength of the pipe are excellent, and the pipeline safety factor is high.

2. Good anti-aging performance, the normal service life can reach more than 50 years.

3. The pipeline has excellent corrosion resistance to inorganic acids, alkalis, and salts, and is suitable for industrial sewage discharge and transportation.

4. The pipeline has a small friction coefficient, smooth water flow, is not easy to block, and requires less maintenance work.

5. The material has a high oxygen index and is self-extinguishing.

6. The linear expansion coefficient of the pipeline is small, which is 0.07mm/℃, and the deformation is small due to temperature changes. The thermal conductivity and elastic modulus are small, providing excellent anti-freezing performance compared to cast iron drainage pipes.

7. The connection of pipes and fittings can be bonded, making the construction method simple, the operation convenient, and the installation efficient.

8. It has good water tightness: The installation of PVC-U pipes, whether it is bonded or connected with rubber rings, ensures excellent water tightness.

PVC Drainage Pipe

Installation Instructions

1. Pipe sawing and beveling:  

The length of the plastic drainage pipe is determined layer by layer based on actual measurements and combined with the size of each connecting pipe. Pipe sawing tools should be fine-toothed saws, cutters, and pipe cutters. The fracture should be flat, with no deformation at the cross-section. The plug part to be bonded can be filed into a 15o~30o groove with a medium-sized plate file. The groove length should generally not be less than 3mm, and the groove thickness should be 1/3~1/2 of the pipe wall thickness. After the groove is completed, debris should be cleaned up.

2. Protection of the socket joint:  

After the socket joint is connected, the extruded adhesive should be wiped clean with cotton yarn or dry cloth dipped in a little acetone or other cleaning agents. According to the performance of the adhesive and climatic conditions, let it stand until the interface is cured. The curing time should be appropriately extended during winter construction.

Design Method

Plastic pipe formula design method  

1. PVC plastic pipe technology and design principles:  

   (1) The resin should be selected from PVC-SC5 resin or PVC-SG4 resin, that is, polyvinyl chloride resin with a polymerization degree of 1200~1000.  

   (2) A heat stabilization system must be added. Select according to the actual production requirements, and pay attention to the synergistic and antagonistic effects between heat stabilizers.  

   (3) An impact modifier must be added. CPE and ACR impact modifiers can be selected. According to other components in the formula and the plasticizing capacity of the extruder, the addition amount is 8~12 parts. CPE has a low price and a wide source, and ACR has high aging resistance and weld angle strength.

Construction and Burial Requirements

1. Before the subbase of the roadbed unit is constructed, the horizontal center-dividing drainage pipe must be buried.

2. Grooving: Manual grooving is carried out according to the design drawing and the design pile number position measured by the surveyor. The PE pipe groove width should be slightly wider than the plastic drainage pipe diameter by 1~2 cm, and the groove depth should be 23 cm below the roadbed surface. The groove length requires the inner side to be 10 cm away from the centerline, the outer side to extend to the slope, and the excavation section to extend to the inner wall of the ditch. The slope of the groove should follow the horizontal drainage slope of the road, and the reverse slope should not be allowed to ensure that the water in the road drains outside the roadbed. Before grooving, the line should be pulled to ensure straightness.

3. Pipe connection: The two ends of each PVC pipe must be tightened after the rubber ring is put on to avoid water leakage.

4. Pipe laying: After cleaning the bottom of the trench and connecting the pipe according to the trench length, the pvc drainage pipe should be placed into the trench. Use sackcloth to tie the end of the pipe on the central dividing strip to prevent debris from entering the pipe and causing a blockage.

5. Backfill: Select the excavated fine-grained soil for backfilling or use sandy soil. Large stones must be removed. After backfilling, it must be compacted manually. The top surface of the backfill soil must not be higher than the roadbed and should be 1~2 cm lower than the roadbed surface. Otherwise, it will be crushed by vehicles and unable to discharge water.

6. Cleaning: The remaining soil after backfilling must be immediately transported out of the site, and the road surface must be cleaned. The remaining soil of the PE pipe must be unloaded at designated locations such as the soil borrowing site, and must not be unloaded on the road at will.

7. After the subbase construction of the fill section is completed, the brushed slope, and at the outlet according to the design size, cast a trapezoidal outlet pad. The pad is cast using a fixed wooden mold. The slope is flattened before casting, and 3 25 cm long bamboo sticks are nailed in to facilitate stability.

8. Pay attention to ensure that there is a drainage pipe at the lowest point of the vertical curve of the route to ensure that there is no water on the road surface. The buried requirements of the ultra-high-pressure pipe are in the super-high section of the filling. After the roadbed is inspected, the position of the pipeline and the well shall be measured and laid out in time according to the design position of the drawing. The grooves shall be dug manually with small excavators. The slope of the bottom of the groove shall meet the design requirements to ensure smooth drainage. The groove width shall not be less than the designed 47cm.

Application

PVC drainage pipes have been increasingly widely used in various industries. The main material of PVC drainage pipes is polyvinyl chloride. Polyvinyl chloride has strong heat resistance and corrosion resistance, which is one of the reasons why polyvinyl chloride is widely used. In order to make the building facade more beautiful, indoor rainwater drainage systems are increasingly widely used. Indoor rainwater pipes are generally designed for non-pressure flow, but because the rainwater flow is sometimes large and concentrated, there are both gravity flow and pressure flow in the pipes. Thus, indoor rainwater pipes are required to have stronger pressure resistance than other drainage pipes.

PVC drain pipe is an alternative to traditional drainage pipes and has better physical and chemical properties. Its inner wall is smooth and has less friction resistance than conventional drainage materials. Therefore, the installation slope of the horizontal pipe is small, which can increase the indoor net height of the building. At the same time, PVC drain pipes are light, one-fifth the weight of cast iron pipes, easy to transport and operate. They use adhesive connections, making installation and maintenance convenient. The price is lower than conventional drainage pipes, greatly reducing the project cost. The corrosion resistance of plastic drainage pipe is strong, and it is widely used in building sewage and rainwater systems. Additionally, the widespread use of PVC drainage pipes is conducive to saving steel, which is of great significance to alleviating the shortage of steel in my country. Compared with cast iron pipes and steel pipes, PVC-U drainage pipes have the disadvantages of low-pressure resistance and weak impact resistance. However, although PVC-U drainage pipes are flame-retardant materials, for indoor exposed pipes, there is a possibility that the fire will spread upward along the drainage riser.