Hainan Municipal Pipeline

As one of the important components of urban infrastructure, municipal pipelines can timely drain urban surface rainwater, provide industrial and domestic water for the city, and prevent urban water resources from being polluted. Sufficient strength and rigidity, smooth inner wall surface of pipeline, reduced water flow resistance, certain corrosion resistance, sufficient sealing, economy and easy processing are some basic requirements for pipeline materials.

I Prestressed steel cylinder concrete pipe (PCCP)

1 Scope of application

PCCP pipes are most suitable for making large diameter pressure pipes, which can meet the requirements of urban water diversion projects, water supply systems, large 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 High quality new pipes with the advantages of steel pipe (SP) and concrete pipe

② The cost is lower than that of steel pipe, and the steel consumption is 70% less than that of steel pipe

③ Smooth inner wall, good hydraulic performance and convenient construction

④ The service life is more than twice that of steel pipe

II FRP sand pipe (RMPM)

1 Scope of application

As large and medium diameter water supply and drainage pipes and as water supply and drainage pipes in corrosive soil, it has broad prospects.

2 Advantages

As a new type of composite pipe, GRP sand pipe, compared with other pipes, has the characteristics of safety, durability, economy and good comprehensive benefits, and has won people's attention.

III PVC-U pipe

1 Scope of application

PVC-U pipe is rigid PVC 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 pipe is usually connected by inner sleeve bonding. Double wall corrugated pipe, reinforced pipe and flat wall pipe are usually connected by socket and sealed by rubber ring. For flat wall pipes, when the pipe diameter is less than 200 mm, they are mostly connected by bonding. Based on various advantages of PVC-U pipe, it is widely used in municipal drainage and rainwater pipes, and is convenient for construction and installation.

2 Advantages

When PVC-U pipe is used as drainage pipe, the concentration of hydrogen sulfide gas in the pipe is much higher than that in the concrete drainage pipe, and PVC-U pipe has good sealing performance for odor. When PVC-U is used as a drainage pipe, its production energy consumption only accounts for 20% of the drainage cast iron pipe with the same pipe diameter. 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 pipe is brittle and not resistant to external pressure, so when the pressure requirement is high, reinforced pipe or steel plastic composite winding pipe is used, with good compressive performance.

IV Glass ductile iron pipe

1 Scope of application

Ductile iron pipe is a kind of cast iron pipe, which is used as buried water supply pipe.

2 Advantages

It is cheaper than steel pipe, easy to manufacture, and has strong corrosion resistance; The disadvantages are brittle and heavy. There are data showing that there are pipes between DN40 and DN80, but only specifications above DN80 are listed in the design manual. There is no change in pipe wall thickness due to nominal pressure, and it is unnecessary to specify the nominal pressure level.

V High density polyethylene (HDPE) drainage pipe

1 Scope of application

HDPE is a high crystallinity, 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 the 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 the traditional pipes such as cast iron pipes and galvanized steel pipes and become the mainstream pipes. Compared with traditional pipes, plastic pipes have obvious advantages such as light weight, corrosion resistance, small water flow resistance, energy saving, simple and rapid installation, and low cost, which are favored by the pipeline engineering industry.

VI Reinforced polypropylene (FRPP) molded pipe

1 Scope of application

Glass fiber reinforced polypropylene (FRPP) pipes are produced with glass fiber modified polypropylene raw materials treated with coupling agent. It is widely used in petroleum, chemical industry, electric power, textile, metallurgy, pharmacy, paper making, food, mining, garbage treatment, construction and other industries, as corrosive liquid transportation and process pipeline, and is trusted by users.

2 Advantages

The product has the characteristics of corrosion resistance, high strength, leakage resistance, small internal resistance, tensile resistance, bending resistance, low cost, long service life, convenient installation and maintenance, etc.

VII Glass fiber reinforced plastic (RPM) pipe

1 Scope of application

The pipe uses high-strength glass fiber reinforced plastic as the internal and external reinforcement layer, cheap quartz sand/resin as the core layer in the middle to improve the rigidity of the pipe, supplemented by a tough acid and alkali resistant inner lining and an external protective layer meeting 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 pipe: composite pipe wrapped pipe and centrifugal casting pipe. When centrifugal casting process is adopted, glass fiber is chopped fiber; When winding process is adopted, glass fiber shall be long fiber. The maximum diameter of centrifugally cast RPM pipe is 2400mm, and the maximum diameter of filament wound RPM pipe can reach 4000mm. It is thermosetting plastic pipe.

2 Advantages

① Good corrosion resistance

② Light weight and high strength, easy installation

③ Smooth surface, with high flow capacity

④ Good low-temperature resistance and thermal insulation performance.

8、 HDPE steel belt reinforced spiral bellows

1 Scope of application

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

2 Advantages

The compounding of each layer is carried out under the plastic melting state; It is completely different from the secondary melting and forming of winding pipe (hollow wall pipe), so the layers are completely bonded and the fastness is very high.

The surface of the steel strip is specially pretreated to enhance the corrosion resistance of the steel and the adhesion between the steel and plastic, and improve the peel strength. The overall structure of the pipe is firm and reliable when the plastic raw materials are fully melted. The use of special materials and processes not only solves the problem of corrosion prevention of steel plates, but also solves the adhesion between steel plates and PE materials, so that the service life of pipes is the same as that of pure plastic pipes, which is guaranteed to be more than 50 years.

Electric melting connection, heat shrinking band connection, internal and external extrusion welding or combination of multiple connections can be used to ensure firm connection. Reliable connection can make the pipeline reach zero leakage.

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

1 Introduction

HDPE winding structure wall type B pipe, also known as carat pipe. It is a kind of special-shaped structural wall flexible pipe with smooth inner wall and spiral reinforcing ribs on the outer wall, which is made from the ribbed pipe whose bottom film and rib interface are O-shaped by the spiral winding process. It uses high-density polyethylene as the raw material, and is formed once by the winding process in the hot melt state, and cooled by rolling air cooling before the hot state is demoulded. The pipe gradually dissipates heat, with uniform wall thickness and no internal stress.

2 Advantages

Socket type electric fusion connection and throttling type socket connection are adopted for pipe connection. Socket type electric fusion connection is the best way to ensure the overall resistance of the pipe. The construction is convenient, safe and zero leakage, which has been widely used around the world.

10、 Plastic manhole

1 Definition of inspection well

The inspection well is an accessory building used for rainwater and sewage drainage pipelines, and is a necessary facility for regular inspection and dredging of pipelines and prevention of pipeline blockage.

2. System composition of inspection well

① The plastic inspection well for drainage is composed of well seat, shaft, well cover or protective cover and inspection well accessories, and its basic elements should meet the requirements of the national standards for the product industry of the relevant industries;

② The design, construction, acceptance and maintenance shall comply with CECS227:2007 Technical Specification for Application of Plastic Drainage Inspection Wells in Residential Areas

3 Application field of inspection well

The inspection well is applicable to the sewage discharge, acid and alkali industrial wastewater discharge, hospital and disease control area, rainwater collection, etc. in the construction area (residential area, scientific research institute, school, factory area), parking lot, green land, road, printing and dyeing area.

4 Application at home and abroad

① Europe, America and Japan are very mature in technology, with a market share of more than 80%;

② The development of pipelines and wells in foreign countries is synchronized, and the fittings in China are lagging behind, and the standards are not timely, which affects the development of inspection wells;

③ The application of inspection wells in China is in the promotion stage, with a large investment space. In the north, especially in the northwest, it began to be popularized.

11、 HDPE steel wire mesh skeleton

1 Scope of application

The steel mesh skeleton plastic composite pipe is a new type of steel mesh skeleton plastic composite pipe. This kind of pipe is also called srtp pipe. This new type of pipe is made of high-strength superplasticized steel wire mesh framework and thermoplastic polyethylene as raw materials, steel wire winding mesh as the framework reinforcement of polyethylene plastic pipe, high density polyethylene (HDPE) as the matrix, and high performance HDPE modified bonding resin is used to closely connect the steel wire framework with the inner and outer layers of high-density polyethylene, so that it has excellent composite effect. Because high-strength steel wire reinforcement is wrapped in continuous thermoplastic, this composite pipe overcomes the shortcomings of steel pipe and plastic pipe, while maintaining the advantages of steel pipe and plastic pipe. It is a new type of pipe with excellent performance, widely used in oil fields, power plants, chemical and petrochemical enterprises, water companies, municipal gas Seawater utilization pipeline and other fields.

2 Advantages

The steel mesh skeleton plastic composite pipe adopts high-quality materials and advanced production technology, which makes 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 transmission pipeline systems. The fittings used for the polyethylene composite pipe with steel mesh framework are polyethylene electrofusion fittings. During the connection, the outer plastic layer of the pipe and the inner plastic layer of the pipe are fused by the inner heating element of the pipe, and the pipe and the pipe are reliably connected together.

12、 HDPE double wall corrugated pipe

1 Scope of application

This kind of pipe adopts high density polyethylene (HDPE) as the main raw material. Through the double machine co extrusion molding process, the pipe with circular corrugated outer wall and smooth inner wall 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, aging resistance and long service life.

13、 PP double wall corrugated pipe

1 Product Introduction

The structure of PP double wall corrugated pipe is the same as that of common PE double wall corrugated pipe. It is a pipe of annular structure with modified polypropylene as raw material, which is extruded by internal and external extruders respectively, and is formed in one time. The inner wall is smooth, the outer wall is in sine wave shape, and the inner and outer walls are hollow and tightly welded.

2 Product specifications

The maximum diameter can reach DN1800 mm abroad, and the maximum diameter can reach DN1200 mm in domestic production at present, but it is basically between DN200 mm and 800 mm.