Municipal Pipeline Materials

Prestressed steel cylinder concrete pipe (PCCP)

1. Scope of application PCCP pipe is most suitable for making large-diameter pressure pipes, which can meet the requirements of urban water diversion projects, water supply systems, large-scale sewage pipeline projects, and circulating water pipelines of large thermal power plants and nuclear power plants. There is a national standard for prestressed steel cylinder concrete pipes (GB/T19685-2005).

2. Advantages

① A high-quality new pipe with the advantages of steel pipe (SP) and concrete pipe

② Lower cost than steel pipe, 70% less steel consumption than steel pipe

③ Smooth inner wall, good hydraulic performance, convenient construction

④ Service life is more than double that of steel pipe

3. Case South-to-North Water Diversion Project

Glass Fiber Reinforced Plastic Pipe (RMPM)

1. Scope of application As a large and medium-caliber water supply and drainage pipe and as a water supply and drainage pipe in corrosive soil, it has broad prospects.

2. Advantages As a new type of composite pipe, compared with other pipes, Glass Fiber Reinforced Plastic Pipe has the characteristics of safety, durability, economy and good comprehensive benefits, and has won people's attention.

3. Case Zhangfeng Reservoir Water Supply Main Trunk XIII Standard Glass Fiber Reinforced Plastic Pipe Installation Begins

PVC-U Pipe

1. Scope of application PVC-U pipe is a rigid polyvinyl chloride pipe, and the pipe wall structure includes double-wall corrugated pipe, reinforced pipe, flat wall pipe and steel-plastic composite winding pipe. Steel-plastic composite winding pipes are usually connected by inner sleeve bonding. Double-wall corrugated pipes, reinforced pipes and flat wall pipes are usually connected by socket and sealed with rubber rings. For flat wall pipes, when the pipe diameter is less than 200 mm, bonding is often used for connection. Based on the various advantages of PVC-U pipes, they are widely used in municipal drainage and rainwater pipes, and are easy to construct and install.

2. Advantages When PVC-U pipes are used as drainage pipes, the concentration of hydrogen sulfide gas in the pipes is much higher than that in concrete drainage pipes, and PVC-U pipes have good sealing performance against odor. When PVC-U is used as a drainage pipe, its production energy consumption is only 20% of that of the same diameter drainage cast iron pipe. It has low cost, aging resistance, good thermal insulation effect and long service life, so it is widely used in municipal drainage. The material of PVC-U pipes is brittle and not resistant to external pressure. Therefore, when the pressure requirement is high, reinforced pipes or steel-plastic composite winding pipes are used, which have good pressure resistance.

Ductile iron pipe

1. Scope of application Ductile iron pipe is a kind of cast iron pipe, used as buried water supply pipe.

2. Advantages Compared with steel pipe, it is cheaper, easier to manufacture and has strong corrosion resistance; the disadvantages are brittleness and heavy weight. There are data showing pipes between DN40 and DN80, but the design manual only lists specifications above DN80. There is no change in pipe wall thickness due to nominal pressure, and there is no need to specify the nominal pressure level.

High-density polyethylene (HDPE) drainage pipe

1. Scope of application HDPE is a highly crystalline, non-polar thermoplastic resin. The appearance of the original HDPE is milky white, and it is translucent to a certain extent in the thin section. In the water supply and drainage pipeline system, plastic pipes have gradually replaced traditional pipes such as cast iron pipes and galvanized steel pipes and become the mainstream pipes.

2. Advantages In the water supply and drainage pipeline system, plastic pipes have gradually replaced traditional pipes such as cast iron pipes and galvanized steel pipes and become the mainstream pipes. Compared with traditional pipes, plastic pipes have significant advantages such as light weight, corrosion resistance, low water flow resistance, energy saving, easy and quick installation, and low cost, and are favored by the pipeline engineering industry.

3. Cases Municipal engineering water supply system, indoor water supply system of buildings, outdoor buried water supply system and buried water supply system of residential areas and factory areas, repair of old pipelines, water treatment engineering pipeline system, industrial water pipes in gardens, irrigation and other fields, etc.

Reinforced polypropylene (FRPP) molded pipe

1. Scope of application Glass fiber reinforced polypropylene (FRPP) pipe is produced with glass fiber modified polypropylene raw materials treated with coupling agent. It is widely used in petroleum, chemical, electric power, textile, metallurgy, pharmaceutical, papermaking, food, mining, garbage disposal, construction and other industries, used as corrosive liquid transportation and process pipelines, and is deeply trusted by users.

2. Advantages The product has the characteristics of corrosion resistance, high strength, anti-leakage, low internal resistance, tensile strength, bending resistance, low cost, long life, easy installation and maintenance.

Glass fiber reinforced plastic sand (RPM) pipe

1. Scope of application The pipe is made of high-strength fiberglass as the inner and outer reinforcement layers, and the middle is made of cheap quartz sand/resin as the core layer to improve the rigidity of the pipe, and then supplemented with a tough acid and alkali corrosion-resistant lining layer 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 by centrifugal casting or winding process. Therefore, there are two types of composite pipes, wound pipes, composite pipes and centrifugal casting pipes. When the centrifugal casting process is used, the glass fiber uses short chopped fibers; when the winding process is used, the glass fiber uses long fibers. The maximum diameter of the centrifugally cast RPM pipe is 2400mm, and the maximum diameter of the fiber-wound RPM pipe can reach 4000mm. It is a thermosetting plastic pipe.

2. Advantages

①Good corrosion resistance ②Lightweight and high strength, easy to install ③Smooth surface, high flow capacity ④Good low temperature resistance and good thermal insulation performance

HDPE steel belt reinforced spiral corrugated pipe

1. Scope of application HDPE steel belt reinforced spiral corrugated pipe, commonly known as steel belt pipe, is a large-diameter, high-strength drainage and sewage pipe. It adopts U-shaped steel belt composite PE material, which greatly improves the ring stiffness of the pipe without increasing the cost. Under the same weight, the strength is greatly improved compared with the winding pipe and carat pipe, which can solve a series of problems such as heavy load.

2. Advantages The compounding of each layer is carried out in the molten state of plastic; it is completely different from the secondary melting molding of the winding pipe (hollow wall pipe), so the layers are completely bonded and the fastness is very high. The surface of the steel belt is specially pretreated to enhance the corrosion resistance of the steel and the adhesion between the steel and the plastic, and improve the peeling strength. The overall structure of the pipe is firm and reliable when the plastic raw material is fully molten. Due to the use of special materials and processes, the corrosion protection problem of steel plates and the adhesion between steel plates and PE materials are solved, making the service life of the pipeline the same as that of pure plastic pipes, guaranteed to be more than 50 years. Electric hot melt connection, heat shrink tape connection, internal and external extrusion welding or a combination of multiple connections can be used to make the connection firm. Reliable connection can make the pipeline achieve zero leakage.

3. Cases In municipal engineering, it is often used for buried drainage and sewage pipes

HDPE reinforced winding structure wall B-type pipe (carat pipe)

1. Introduction HDPE winding structure wall B-type pipe, also called carat pipe. It is a special-shaped structure wall flexible pipe with a smooth inner wall and a spiral reinforcement rib on the outer wall. The bottom film and the rib interface are O-shaped rib pipes made by spiral winding process. It uses high-density polyethylene as raw material, and is formed in one time by winding process in the hot melt state, and is cooled by rolling air cooling before demolding in the hot state. The pipe gradually dissipates heat, the wall thickness is uniform, and there is no internal stress.

2. Advantages The pipe connection adopts socket-type electric fusion connection and throttling socket-type connection, and the best socket-type electric fusion connection ensures the overall resistance of the pipe. The construction is convenient, safe and leak-free, and it has been widely used all over the world. 3 Cases It was rated as a key promotion product by the Ministry of Construction in China. It is a new type of high-quality pipe product for the national promotion of "plastic instead of steel, plastic instead of cement" in urban rainwater and sewage systems. It is a new type of buried drainage and sewage "green" pipe with large diameter and heavy load, safe, environmentally friendly and efficient, anti-corrosion and sealing, and zero leakage. After continuous research and development and innovation, the seismic fortification intensity of this product has reached 9 levels, which is suitable for uneven settlement geological areas and seismic belt areas.

Plastic inspection well

1. Definition of inspection well Inspection well is an auxiliary building used for rainwater and sewage discharge pipelines. It is a necessary facility for regular inspection and dredging of pipelines and prevention of pipeline blockage.

2. Composition of inspection well system

①Plastic inspection well for drainage consists of well seat, well shaft, well cover or protective cover and inspection well accessories. Its basic elements shall meet the requirements of national standards of relevant industry products; ②Design, construction, acceptance and maintenance shall meet the requirements of CECS227:2007 "Technical Specifications for Application of Plastic Drainage Inspection Wells in Building Residential Areas" 3. Application Field of Inspection Well Inspection well is suitable for building residential areas (residential areas, scientific research institutes, schools, factory areas), parking lots, green spaces, roads, sewage discharge in printing and dyeing areas, acid and alkali industrial wastewater discharge, hospitals and disease control areas, rainwater collection, etc.

4. Application at home and abroad

①European, American and Japanese technologies are very mature, with a market share of more than 80%;

②Foreign pipelines and wells develop synchronously, while my country's accessories lag behind and standards are not timely, which affects the development of inspection wells;

③The application of domestic inspection wells is in the promotion stage, and there is a large investment space. The application has begun to be promoted in the north, especially in the northwest.

HDPE wire mesh skeleton

1. Scope of application Wire mesh skeleton plastic composite pipe is a new type of steel skeleton plastic composite pipe that has been improved. This type of pipe is also called SRTP pipe. This new type of pipe is made of high-strength plasticized steel wire mesh skeleton and thermoplastic polyethylene as raw materials. The steel wire winding mesh is used as the skeleton reinforcement of the polyethylene plastic pipe. The high-density polyethylene (HDPE) is used as the matrix. The high-performance HDPE modified adhesive resin is used to tightly connect the steel wire skeleton with the inner and outer layers of high-density polyethylene, so that it has an excellent composite effect. Because the high-strength steel wire reinforcement is coated in continuous thermoplastic plastic, this composite pipe overcomes the shortcomings of steel pipes and plastic pipes, while maintaining the advantages of steel pipes and plastic pipes. It is a new type of pipeline with excellent performance and is widely used in oil fields, power plants, chemical and petrochemical enterprises, water companies, municipal gas, seawater utilization pipelines and other fields.

2. Advantages The steel wire mesh skeleton plastic composite pipe uses high-quality materials and advanced production processes to make it have higher pressure resistance. At the same time, the composite pipe has excellent flexibility and is suitable for long-distance buried water supply and gas pipeline systems. The pipe fittings used in the steel wire mesh skeleton polyethylene composite pipe are polyethylene electric fusion pipe fittings. When connecting, the heating element inside the pipe is used to melt the outer plastic of the pipe and the inner plastic of the pipe, and the pipe and the pipe are reliably connected together.

HDPE double-wall corrugated pipe

1. Scope of application This pipe uses high-density polyethylene (HDPE) as the main raw material. Through the co-extrusion molding process of two machines, the pipe with annular corrugation on the outer wall and smooth inner wall is produced. It is widely used in municipal sewage and drainage.

2. Advantages HDPE double-wall corrugated pipe has the advantages of good flexibility, light weight, strong pressure resistance, corrosion resistance, anti-aging and long life.

PP double-wall corrugated pipe

1. Product introduction The structure of PP double-wall corrugated pipe is consistent with the common PE double-wall corrugated pipe. It is made of modified polypropylene as raw material, extruded by internal and external extruders respectively, and formed in one time. The inner wall is smooth, the outer wall is sinusoidal corrugated, and the inner and outer walls are hollow and tightly welded annular structures.

2. Product specifications: The maximum caliber abroad can reach DN1800mm, and the maximum domestic production can reach DN1200mm, but it is basically between DN200mm-800mm.

3. Product series: Data shows that the ring stiffness of PP double-wall corrugated pipe can reach SN14, and there are four series in China: SN4, SN8, SN10, and SN12.5.