Pictures of types of drainage pipes

List of recommended pipes

Indoor pipes, indoor drainage pipes, outdoor water supply pipes, outdoor drainage pipes

PPR pipes, UPVC pipes, domestic water supply pipes, domestic + fire protection** *It is recommended to use ductile iron pipes for underground pipelines used in pipeline systems or fire protection pipes. FRPP pipes can be selected in residential areas (the ring stiffness can be 4, 8, or 10KN/㎡ depending on the situation)

No matter whether the living pipes are exposed or installed, Plastic-coated steel pipes and plastic-lined steel pipes can be used for burial.

Fire-fighting water supply pipes can use hot-dip galvanized steel pipes with inner and outer walls. Exposed fire-fighting pipes can use hot-dip galvanized steel pipes with inner and outer walls. HDPF winding reinforced pipes can be optional for ports and terminals. (The maximum ring stiffness can reach 20KN/㎡ depending on the situation).

Pipe materials

Pipe material list

Serial number Pipe name

1 Rigid polyvinyl chloride (PVC-U) pipe

2 Random polypropylene (PP-R) water supply pipe

3 Aluminum-plastic composite water supply pipe

4 Copper pipe

5 Thin-walled stainless steel pipe

6 Hot-dip galvanized steel pipe

7 Welded steel pipe

8 Chlorinated polyvinyl chloride (PVC-C) water supply pipe

9 Polyethylene (PE) pipe

10 Acrylonitrile-butadiene-styrene (ABS) plastic water supply pipe

11 Plastic-coated steel pipe

12 Plastic lined steel pipe

13 Cast iron pipe

14 High density polyethylene (HDPE) drainage pipe

15 Reinforced polypropylene (FRPP) molded pipe

1. Rigid polyvinyl chloride (PVC-U) pipe

PVC-U pipe structure: It uses sanitary grade polyvinyl chloride (PVC) resin as the main raw material, adding an appropriate amount of Stabilizers, lubricants, fillers, colorants, etc. are extruded by plastic extruders and injection molded by injection molding machines. The production of pipes and pipe fittings is completed through cooling, solidification, shaping, inspection, packaging and other processes.

The advantages of PVC-U pipes: light weight, corrosion resistance, small water flow resistance, energy saving, quick installation, and low cost.

Scope of application: urban tap water supply projects, building internal and external water supply projects, industrial and mining enterprise water supply projects, underground fire water supply projects, farmland water conservancy water supply irrigation projects, gardening and horticulture water supply projects, aquaculture water supply Drainage works, etc.

PVC-U pipe structure: It is made of sanitary grade polyvinyl chloride (PVC) resin as the main raw material, with appropriate amounts of stabilizers, lubricants, fillers, color enhancers, etc. added and extruded through a plastic extruder. Molding and injection molding machine injection molding completes the production of pipes and pipe fittings through cooling, solidification, shaping, inspection, packaging and other processes.

The advantages of PVC-U pipes: light weight, corrosion resistance, small water flow resistance, energy saving, quick installation, and low cost.

2. Random polypropylene (PP-R) water supply pipe

PP-R pipe structure: also known as type III polypropylene pipe, it adopts random polypropylene pipe *Polypropylene is extruded into pipes and injection molded into fittings. It is a new plastic pipe product developed and applied in Europe in the early 1990s. In the late 1980s, PP-R used a gas-phase polymerization process to randomly and uniformly polymerize about 5% PE in the molecular chain of PP (random polymerization) to become a new generation of pipe materials.

Advantages of PPR pipe: moderate price, stable performance, heat resistance and insulation, corrosion resistance, smooth inner wall without scaling, safe and reliable pipeline system without penetration, and service life of up to 50 years. It is said to never scale, never rust, never leak, and is a green advanced water supply material. It has good impact resistance and long-term creep performance.

Disadvantages of PPR pipes: The construction technology requires high requirements, and special tools and professionals are required for construction to ensure system safety.

PPR pipe application areas: hot and cold water systems in buildings, including central heating systems; heating systems in buildings, including floors, wall panels and radiant heating systems; pure water supply that can be directly drank System; central (centralized) air conditioning system; industrial piping system for transporting or discharging chemical media.

PP-R pipe structure: also known as type III polypropylene pipe, it is made of random polypropylene, which is extruded into pipes and injection molded into pipe fittings. It is a new plastic pipe product developed and applied in Europe in the early 1990s. In the late 1980s, PP-R used a gas-phase polymerization process to randomly and uniformly polymerize about 5% PE in the molecular chain of PP (random polymerization) to become a new generation of pipe materials.

Disadvantages of PPR pipes: The construction technology requires high requirements, and special tools and professionals are required for construction to ensure system safety.

3. Aluminum-plastic composite water supply pipe

Aluminum-plastic composite pipe structure: The basic composition should be five layers, that is, from the inside to the outside, they are plastic, hot melt adhesive, aluminum alloy, Hot melt adhesive and plastic were the first water supply pipes to replace cast iron pipes.

Advantages of aluminum-plastic composite pipes: Aluminum-plastic composite pipes have good thermal insulation performance, and the inner and outer walls are not easy to corrode. Because the inner wall is smooth, it has little resistance to fluid; and because it can be bent at will, it is easy to install and construct.

Aluminum-plastic water supply pipes on the market:

1. PE/AL/PE

(Polyethylene/Aluminum/Polyethylene);

2. PE／AL／PEX

(Polyethylene/Aluminum/CrosslinkedPolyethylene);

3. PEX／AL／PEX

(CrosslinkedPolyethylene/Aluminum/CrosslinkedPolyethylene) .

The first one is that the inner and outer layers are made of polyethylene, the second one is that the inner layer is made of cross-linked polyethylene and the outer layer is made of polyethylene, the third one is that both the inner and outer layers are made of cross-linked polyethylene, and the middle layer All are aluminum layers. The first type is generally used in cold water pipe systems, and the latter two are generally used in hot water pipes.

Aluminum-plastic composite pipe structure: The basic composition should be five layers, that is, from the inside to the outside, they are plastic, hot melt adhesive, aluminum alloy, hot melt adhesive, and plastic. It was the earliest water supply pipe to replace cast iron pipes.

Aluminum-plastic water supply pipes on the market:

1. PE/AL/PE

(Polyethylene/Aluminum/Polyethylene);

2. PE／AL／PEX

(Polyethylene/Aluminum/CrosslinkedPolyethylene);

3. PEX／AL／PEX

(CrosslinkedPolyethylene/Aluminum/CrosslinkedPolyethylene) .

The first one is that the inner and outer layers are made of polyethylene, the second one is that the inner layer is made of cross-linked polyethylene and the outer layer is polyethylene, the third one is that both the inner and outer layers are made of cross-linked polyethylene, and the middle layer All are aluminum layers. The first type is generally used in cold water pipe systems, and the latter two are generally used in hot water pipes.

4. Copper tube

Copper tube structure: also called copper tube. A type of non-ferrous metal pipe, it is a pressed and drawn seamless pipe.

Advantages of copper pipes: Copper pipes are characterized by their ability to inhibit the growth of bacteria on a regular basis. The mechanical strength and damage resistance are also good, but it is not acid-resistant and is easily oxidized in a humid environment to produce patina, which is also a toxic substance. In addition, because its thermal conductivity is too large, it must be well insulated if it is used to transport hot water. Copper pipes have the advantages of high strength and high plasticity. They do not contain harmful substances, are pure, natural, have strong corrosion resistance, do not pollute the environment, have small coefficients of thermal expansion and contraction, are resistant to high temperature environments, are fireproof, and can withstand severe cold weather in the north. , suitable for transporting hot water, anti-aging, anti-corrosion, not softened by organic matter, not penetrated by harmful gases or liquids, and is the best water supply pipe.

Disadvantages of copper pipes: high price.

Copper tube structure: also called copper tube. A type of non-ferrous metal pipe, it is a pressed and drawn seamless pipe.

Advantages of copper pipes: Copper pipes are characterized by their ability to inhibit the growth of bacteria on a regular basis. The mechanical strength and damage resistance are also good, but it is not acid-resistant and is easily oxidized in a humid environment to produce patina, which is also a toxic substance. In addition, because its thermal conductivity is too large, it must be well insulated if it is used to transport hot water. Copper pipes have the advantages of high strength and high plasticity. They do not contain harmful substances, are pure, natural, have strong corrosion resistance, do not pollute the environment, have small thermal expansion and contraction coefficients, are resistant to high temperature environments, are fireproof, and can withstand severe cold weather in the north. , suitable for transporting hot water, anti-aging, anti-corrosion, not softened by organic matter, not penetrated by harmful gases or liquids, and is the best water supply pipe.

Disadvantages of copper pipes: high price.

5. Thin-walled stainless steel pipe

Thin-walled stainless steel pipe structure: stainless steel strip or stainless steel plate with a wall thickness of 0.6~2.0mm, using automatic argon arc welding and other fusion welding processes Made of pipes.

Advantages of thin-walled stainless steel pipes: Domestic thin-walled stainless steel water pipes are a new type of pipe that came out in the late 1990s. Due to their safety and hygiene, high strength, good corrosion resistance, durability, and long life, Maintenance-free, beautiful and other features, excellent mechanical properties, superior wear resistance, good safety and health performance, good temperature resistance, good thermal insulation performance, smooth inner wall with low water resistance; beautiful appearance, clean and fashionable, 100% It can be recycled and reused; it is conducive to saving water resources; it has a wide range of uses; it has a long service life and low overall cost.

Application fields of thin-walled stainless steel pipes: At present, stainless steel water pipes have strong development momentum and have been widely used in building water supply and direct drinking water pipes.

Thin-walled stainless steel pipe structure: stainless steel strips or stainless steel plates with a wall thickness of 0.6~2.0mm, pipes made by fusion welding processes such as automatic argon arc welding.

6. Hot-dip galvanized steel pipe

Hot-dip galvanized steel pipe structure: Galvanized steel pipes are divided into cold-dip galvanized pipes and hot-dip galvanized pipes. The former has been banned. Hot-dip galvanizing pipe reacts molten metal with an iron matrix to produce an alloy layer, thereby combining the matrix and the coating. Hot-dip galvanizing is to pickle the steel pipe first. In order to remove the iron oxide on the surface of the steel pipe, after pickling, it is cleaned in an aqueous solution of ammonium chloride or zinc chloride or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to in a hot dip plating tank.

Advantages of hot-dip galvanized steel pipe: Hot-dip galvanizing has the advantages of uniform coating, strong adhesion, and long service life. The hot-dip galvanized steel pipe matrix undergoes complex physical and chemical reactions with the molten plating bath to form a corrosion-resistant zinc-iron alloy layer with a tight structure. The alloy layer is integrated with the pure zinc layer and the steel pipe matrix. Therefore, it has strong corrosion resistance.

Disadvantages of hot-dip galvanized steel pipes: As galvanized pipes are water pipes, a large amount of rust is produced in the pipes. The yellow water flowing out not only pollutes the sanitary ware, but is also mixed with bacteria that breed on the rough inner wall. The rust causes excessive heavy metal content in the water. High, seriously endangering human health. Galvanized pipes have been banned since 2000. At present, galvanized pipes are rarely used in cold water pipes in newly built residential areas. Some residential areas use galvanized pipes for hot water pipes.

Application fields of hot-dip galvanized steel pipes: The iron pipes currently used for gas, greenhouses, and heating are also galvanized pipes.

7. Welded steel pipe

Welded steel pipe structure: can be divided into straight seam welded pipe and spiral welded pipe.

Long seam welded pipe: The production process is simple, the production efficiency is high, the cost is low, and the development is rapid.

However, compared with straight seam pipes of the same length, the weld length is increased by 30~100%, and the production speed is lower. Therefore, smaller diameter welded pipes mostly use straight seam welding, while large diameter welded pipes mostly use spiral welding.

Advantages of welded steel pipes: high strength and strong strain resistance

Disadvantages of welded steel pipes: poor corrosion resistance and should be treated with anti-corrosion treatments. Steel pipes of the same diameter have different thicknesses, so the wall thickness should be indicated when selecting.

Application fields of welded steel pipes: can be used in fire water supply pipe networks.

Welded steel pipe structure: can be divided into straight seam welded pipe and spiral welded pipe.

Long seam welded pipe: The production process is simple, the production efficiency is high, the cost is low, and the development is rapid.

Advantages of welded steel pipes: high strength and strong strain resistance

Application fields of welded steel pipes: can be used in fire water supply pipe networks.

8. Chlorinated polyvinyl chloride (PVC-C) water supply pipe

Chlorinated polyvinyl chloride (PVC-C) water supply pipe structure: PVC-C resin is the masterbatch. It is made by adding anti-impact agent, stabilizer and other auxiliary materials through high-speed extrusion.

Characteristics of chlorinated polyvinyl chloride (PVC-C) water supply pipe: strong, easy to install, corrosion-resistant, good flame retardant, not affected by residual chlorine, acid and alkali resistant, not easy for bacteria to multiply, Low thermal expansion coefficient, aging resistance, and superior hygienic performance standards:

Application fields of chlorinated polyvinyl chloride (PVC-C) water supply pipes: PVC-C pipes were first used in the chemical industry , such as chlor-alkali industry, smelting industry, petroleum industry, paper industry, etc.

Chlorinated polyvinyl chloride (PVC-C) water supply pipe structure: PVC-C resin is the masterbatch, and anti-impact agent, stabilizer and other auxiliary materials are added through high-speed extrusion.

Characteristics of chlorinated polyvinyl chloride (PVC-C) water supply pipe: strong, easy to install, corrosion-resistant, good flame retardant, not affected by residual chlorine, acid and alkali resistant, not easy for bacteria to multiply, Low thermal expansion coefficient and aging resistance, superior hygienic performance standards:

9. Polyethylene (PE) pipe

Polyethylene (PE) pipe structure: Polyethylene (PE) resin is the main raw material and is extruded water supply pipe.

Characteristics of polyethylene (PE) pipes: No heavy metal salt stabilizers are added during PE pipe processing. The material is non-toxic, has no scaling layer, and does not breed bacteria. It can well solve the secondary problem of urban drinking water. pollute.

Except for a few strong oxidants, it can withstand corrosion from a variety of chemical media; there is no electrochemical corrosion. Under rated temperature and pressure conditions, PE pipes can be safely used for more than 50 years. PE pipes have good toughness and high impact resistance. Heavy objects can directly press through the pipes without causing pipe rupture. The strength of the PE pipe's hot-melt or electro-fusion joint is higher than that of the pipe body, and the joint will not be disconnected due to soil movement or live load. The pipeline is lightweight, the welding process is simple, the construction is convenient, and the overall project cost is low.

Polyethylene (PE) pipe application fields: used in indoor and outdoor low-temperature water supply pipes, etc.

Polyethylene (PE) pipe structure: Polyethylene (PE) resin is the main raw material and extruded water supply pipe.

Polyethylene (PE) pipe application fields: used in indoor and outdoor low-temperature water supply pipes, etc.

10. Acrylonitrile-butadiene-styrene (ABS) plastic water supply pipe

Acrylonitrile-butadiene-styrene (ABS) plastic water supply pipe structure: manufacturing pipes The material is a mixture of acrylonitrile-butadiene-styrene, which is mainly ABS resin, and only the additives required to improve its physical, mechanical properties and processing properties are added. The additives should be evenly dispersed.

Application fields of acrylonitrile-butadiene-styrene (ABS) plastic water supply pipes: Chlorinated polyvinyl chloride pipeline systems used to transport drinking water should comply with the requirements of GB/T17219-1998.

Based on the chemical resistance and hygiene of the material, it is suitable for pressure water supply and drainage transportation, sewage treatment and water treatment, petroleum, chemical industry, power electronics, metallurgy, mining, electroplating, papermaking, food and beverage, and air conditioning , medicine and other industrial and construction fields for the transportation of fluids such as powders, liquids and gases.

Acrylonitrile-butadiene-styrene (ABS) plastic water supply pipe structure: The material used to make the pipe is a mixture of acrylonitrile-butadiene-styrene, of which ABS resin is the main one, and only Add the additives required to improve its physical, mechanical properties and processing properties. The additives should be evenly dispersed.

11. Plastic-coated steel pipe

Plastic-coated steel pipe structure: steel-plastic composite pipe. The product is based on seamless steel pipe and welded steel pipe. The inner wall is coated with high adhesion, anti-corrosion, Food grade hygienic polyethylene powder coating or epoxy resin coating. The diameter range is DN15--DN1200, which can be painted with flange and pressure groove. The coating wall thickness for lengths of 6m, 9m, 12m and variable lengths is between 100 microns and 500 microns, usually 350 microns.

Features of plastic-coated steel pipes:

1. It is hygienic, non-toxic, does not accumulate scale, does not breed microorganisms, and ensures fluid quality

2. Resistant to chemical corrosion, soil and marine biological corrosion, and cathodic stripping

3. The installation process is mature, convenient and fast, and the connection is the same as that of ordinary galvanized pipes

4. Good weather resistance, suitable for harsh environments such as deserts and saline-alkali environments

5. The pipe wall is smooth, improving transportation efficiency and long service life.

Common steel-plastic composite pipes include: steel-lined polypropylene composite pipe (GSF.PP), steel-lined polyvinyl chloride composite pipe (GSF.PVC), steel-lined polyethylene composite pipe (GSF.PE) ), steel lined polytetrafluoroethylene composite pipe (GSF.F4).

Application fields of plastic-coated steel pipes: various forms of circulating water systems (civilian circulating water, industrial circulating water), with excellent performance and anti-corrosion life of up to 50 years. Fire water supply system. Water supply and drainage transportation of various buildings (especially suitable for cold and hot water systems in hotels, hotels, and high-end residential areas). Various chemical fluid transportation (resistant to acid, alkali, salt corrosion). Buried pipes and passing pipes for wires and cables. Ventilation pipes, water supply and drainage pipes of mines and mines.

Plastic-coated steel pipe structure: steel-plastic composite pipe. The product is based on seamless steel pipe and welded steel pipe. The inner wall is coated with high adhesion, anti-corrosion, food-grade hygienic polyethylene powder coating or epoxy. Resin paint. The diameter range is DN15--DN1200, which can be painted with flange and pressure groove. The coating wall thickness for lengths of 6m, 9m, 12m and variable lengths is between 100 microns and 500 microns, usually 350 microns.

Features of plastic-coated steel pipes:

1. It is hygienic, non-toxic, does not accumulate scale, does not breed microorganisms, and ensures fluid quality

2. Resistant to chemical corrosion, soil and marine biological corrosion, and cathodic stripping

3. The installation process is mature, convenient and fast, and the connection is the same as that of ordinary galvanized pipes

4. Good weather resistance, suitable for harsh environments such as deserts and saline-alkali environments

5. The pipe wall is smooth, improving transportation efficiency and long service life.

12. Plastic-lined steel pipe

Plastic-lined steel pipe structure: galvanized seamless steel pipe or welded steel pipe is used as the base pipe. After the welding bars are removed from the inner wall, it is lined with the galvanized pipe, etc. diameter of food-grade polyethylene (PE) pipes. The thickness of the polyethylene lining is required to comply with CJ/T136-2007 standards. It is finally formed after being pressurized and heated for a certain period of time. It is an upgraded product of traditional galvanized pipes.

Plastic lined steel pipe categories:

Long seam welded pipe: simple production process, high production efficiency, low cost and rapid development.

Spiral welded pipes: generally have higher strength than straight seam welded pipes. They can use narrower billets to produce welded pipes with larger diameters, and can also use billets of the same width to produce welded pipes with different diameters. However, compared with straight seam pipes of the same length, the weld length is increased by 30~100%, and the production speed is lower. Therefore, smaller diameter welded pipes mostly use straight seam welding, while large diameter welded pipes mostly use spiral welding.

Application fields of plastic-lined steel pipes: widely used in hot and cold water supply systems of various buildings.

Plastic-lined steel pipe structure: Galvanized seamless steel pipes and welded steel pipes are used as base pipes. After the welding bars are removed from the inner wall, food-grade polyethylene (PE) pipes of the same diameter as the galvanized pipe are lined. The thickness of the vinyl lining is required to comply with the CJ/T136-2007 standard, and it is finally formed after being pressurized and heated for a certain period of time. It is an upgraded product of traditional galvanized pipes.

Plastic lined steel pipe categories:

Long seam welded pipe: simple production process, high production efficiency, low cost and rapid development.

Application fields of plastic-lined steel pipes: widely used in hot and cold water supply systems of various buildings.

13. Cast iron pipe

Cast iron pipe structure: Ductile iron pipe is a type of cast iron pipe.

Advantages of cast iron pipes: cheaper than steel pipes, easy to manufacture, and highly corrosion-resistant.

Disadvantages of cast iron pipes: brittle and heavy.

Application fields of cast iron pipes: used as water supply pipes laid underground.

Cast iron pipe structure: Ductile iron pipe is a type of cast iron pipe.

Advantages of cast iron pipes: cheaper than steel pipes, easy to manufacture, and highly corrosion-resistant.

Disadvantages of cast iron pipes: brittle and heavy.

Application areas of cast iron pipes: used as water supply pipes laid underground.

14. High-density polyethylene (HDPE) drainage pipe

High-density polyethylene (HDPE) drainage pipe structure: HDPE is a highly crystalline, non-polar thermoplastic resin . The appearance of original HDPE is milky white, and it is translucent to a certain extent in thin sections. In the water supply and drainage pipeline system, plastic pipes have gradually replaced traditional pipes such as cast iron pipes and galvanized steel pipes as the mainstream pipe materials.

Features of high-density polyethylene (HDPE) drainage pipes: Compared with traditional pipes, plastic pipes have significant advantages such as light weight, corrosion resistance, small flow resistance, energy saving, easy and quick installation, and low cost. , favored by the pipeline engineering community.

Application fields of high-density polyethylene (HDPE) drainage pipes: municipal engineering water supply systems, building indoor water supply systems, outdoor buried water supply systems and buried water supply systems in residential areas and factories, repair of old pipelines, water Processing of engineering piping systems, industrial water pipes in gardens, irrigation and other fields.

High-density polyethylene (HDPE) drainage pipe structure: HDPE is a highly crystalline, non-polar thermoplastic resin. The appearance of original HDPE is milky white, and it is translucent to a certain extent in thin sections. In the water supply and drainage pipeline system, plastic pipes have gradually replaced traditional pipes such as cast iron pipes and galvanized steel pipes as the mainstream pipes.

15. Reinforced polypropylene (FRPP) molded pipe

Reinforced polypropylene (FRPP) molded pipe structure: Glass fiber reinforced polypropylene (FRPP) pipe is treated with coupling agent Production of glass fiber modified polypropylene raw materials.

Features of reinforced polypropylene (FRPP) molded pipe: The product has the characteristics of corrosion resistance, high strength, leakage resistance, small internal resistance, tensile strength, bending resistance, low cost, long life, easy installation and maintenance, etc.

Application fields of reinforced polypropylene (FRPP) molded pipes: widely used in petroleum, chemical industry, electric power, textile, metallurgy, pharmaceuticals, papermaking, food, mining, waste treatment, construction and other industries, as corrosive Liquid transportation and process pipelines are deeply trusted by users.

Reinforced polypropylene (FRPP) molded pipe structure: Glass fiber reinforced polypropylene (FRPP) pipe is produced from glass fiber modified polypropylene raw material treated with coupling agent.

16. Glass fiber-reinforced plastic sand-filled (RPM) pipe

Glass fiber-reinforced plastic sand-filled (RPM) pipe structure: high-strength fiberglass is used as the inner and outer reinforcing layer, and the price is in the middle. The core layer of cheap quartz sand/resin is used to improve the rigidity of the pipe, and is supplemented by a tough inner lining layer that is resistant to acid and alkali corrosion and an outer protective layer that meets the requirements of the working environment to form a composite pipe wall structure.

RPM pipes can be produced using centrifugal casting or winding processes. Therefore, there are two types: composite pipe, wound pipe, composite pipe and centrifugal cast pipe. When the centrifugal casting process is used, the glass fiber is chopped fiber; when the winding process is used, the glass fiber is long fiber.

The maximum diameter of centrifugally cast RPM pipe is 2400mm, and the maximum diameter of fiber-wound RPM pipe can reach 4000mm. It is a thermosetting plastic pipe.

Characteristics of glass fiber reinforced plastic sand-filled (RPM) pipe: 1) Good corrosion resistance. 2) Lightweight and high strength. 3) Easy to install. 4) The inner surface is smooth and has high circulation capacity. 5) Good low temperature resistance. 6) Good thermal insulation performance.

Glass fiber reinforced plastic sand-filled (RPM) pipe structure: high-strength fiberglass is used as the inner and outer reinforcing layers, and cheap quartz sand/resin is used as the core layer in the middle to improve the stiffness of the pipe, supplemented by toughness The composite pipe wall structure is composed of an inner lining layer that is resistant to acid and alkali corrosion and an outer protective layer that meets the requirements of the working environment.

The maximum diameter of centrifugally cast RPM pipe is 2400mm, and the maximum diameter of fiber-wound RPM pipe can reach 4000mm. It is a thermosetting plastic pipe.

Building water supply and drainage pipe selection table (indoor water supply)

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Get details of the indoor building water supply and drainage pipe selection table

PS: Contains pipe specifications, connection methods, and usage specifications

The future application trend of municipal water supply and drainage pipes will show the following characteristics:

▌01 Development trend in the direction of high durability

The municipal water supply and drainage pipes used in our country have not been used for a long time, and there is still a lack of data to verify their design life. However, in terms of corrosion resistance, plastic pipes are better than metal pipes, so plastic pipes are used in municipal water supply and drainage pipes. It has more applications than metal pipes.

▌02 Flexible interface types are more widely used

The future development trend of municipal water supply and drainage pipes is to use flexible joint-type water supply and drainage pipes, which are easy to install and have a low probability of leakage.

▌03 Development trend of large diameter and multiple varieties

It is more likely that reinforced concrete will be used for super large diameter drainage pipes, and it is also more likely that sand-filled pipes will be used. However, the temperature in winter is relatively high. Low areas are restricted. The "Twelfth Five-Year Plan" has clearly stated that industrial waste can be used in concrete, so it can be used in reinforced concrete with large diameters.

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