Ningbo Fangli Technology Co., Ltd. is a mechanical equipment manufacturer with nearly 30 years’ experiences of plastic pipe extrusion equipment, new environmental protection and new materials equipment. Since its establishment Fangli has been developed based on user’s demands. Through continuous improvement, independent R&D on the core technology and digestion & absorption of advanced technology and other means, we have developed PVC pipe extrusion line, PP-R pipe extrusion line, PE water supply / gas pipe extrusion line, which was recommended by the Chinese Ministry of Construction to replace imported products. We have gained the title of “First-class Brand in Zhejiang Province”.
Here, we’d like to introduce 6 kinds of plastic pipes commonly used in water supply and drainage engineering and their advantages and disadvantages as the followings:
I. Rigid polyvinyl chloride (PVC-U) pipes for water supply （Non lead salt stabilizer）
PVC refers to polyvinyl chloride, and PVC-U refers to rigid polyvinyl chloride. PVC is a kind of plastic, which is harmful to human body because most of the lead salt is added in production. Only a small part of those without lead salt can be used as environmental protection water supply pipes for water supply.
Appearance：
Characteristic：
1） It has high hardness, stiffness and allowable stress.
2） Good aging resistance, durable and life span of up to 50 years.
3） Corrosion resistant, cheap, easy to bond, self extinguishing.
4） Recyclable, easy and simple installation and good sealing.
II. PVC-U pipe for drainage
PVC-U pipe is made of sanitary polyvinyl chloride (PVC) resin as the main raw material, added with an appropriate amount of stabilizer, lubricant, filler and color enhancer, extruded by plastic extruder and injection molded by injection molding machine, and completed the production of pipes and pipe fittings through cooling, curing, shaping, inspection, packaging and other processes. It is an ideal material for building water supply and drainage.
Appearance：
Characteristic：
1) It has excellent physical and chemical properties, chemical corrosion resistance, high impact strength and small fluid resistance. Compared with the cast iron pipe with the same diameter, it is 30% higher in flow, aging resistance, long service life and no less than 50 years. It is an ideal material for building water supply and drainage.
2) Light and durable, easy to install, effectively speeding up the progress of the project
III. PVC-U double wall corrugated pipe for buried drainage
Unplasticized polyvinyl chloride pipes for buried sewage and wastewater are produced by extrusion with PVC resin as the main raw material and necessary additives. UPVC pipes for buried sewage and waste water can be divided into elastic sealing ring connecting pipes according to different connection modes（ φ 110mm- φ 630mm) and adhesive connecting pipe（ φ 110mm- φ 200mm）。 Considering the chemical resistance and heat resistance of materials, pipes for buried sewage and wastewater can also be used as industrial drainage pipes.
Appearance：
Bubbles, sand holes, obvious impurities and irregular ripples are not allowed on the inner and outer walls of the pipe. Both ends of the pipe shall be flat and perpendicular to the axis. The color of pipes shall be uniform. The inner and outer walls of the concave part of the pipe shall be closely welded without separation.
Characteristic：
1） Excellent flame retardancy and impact resistance
2） The inner wall of the pipe is smooth
3） The corrugated outer wall and corrugated hollow structure make the pipe light and high ring stiffness
IV. PE pipes for water supply
PE (polyethylene) material is widely used in the field of water supply pipe manufacturing because of its high strength, corrosion resistance, non-toxic and other characteristics. Because it will not rust, it is an ideal pipe to replace ordinary iron water supply pipe. China's plastic pipeline has developed rapidly and its quality is constantly improving. Because of its unique advantages, polyethylene PE pipe is widely used in building water supply, building drainage, buried drainage pipe, building heating, gas transmission pipe, electrical and telecommunication protection casing, industrial pipe, agricultural pipe and so on. It is mainly used in urban water supply, urban gas supply and farmland irrigation.
Appearance：
Characteristic：
1） Corrosion resistance
Polyethylene has excellent corrosion resistance, good hygienic performance and long service life.
Polyethylene is a non inert material. In addition to a small amount of strong oxidant, it can resist the erosion of a variety of chemicals and is not easy to breed bacteria. The service life of polyethylene pipe is more than 50 years.
2） flexibility
Polyethylene has unique flexibility and excellent scratch resistance.
The flexibility of polyethylene pipeline system has great technical and economic value. The flexibility of polyethylene is an important property, which greatly improves the value of the material for pipeline engineering. Good flexibility enables the polyethylene pipe to be coiled and supplied in a longer length, avoiding a large number of joints and fittings.
V. PE double wall corrugated pipe for buried drainage
PE double wall corrugated pipe for buried drainage is a new type of light pipe with smooth inner wall and closed corrugated outer wall, which is made of polyethylene as raw material and processed by extrusion and special molding process. It has good performance and good quality. It is suitable for all kinds of projects and is widely used in municipal sewage drainage, farmland / garden drainage and irrigation, buried drainage outside buildings, mines Tunnel ventilation and drainage, communication cable and optical cable protective sleeve, and drainage of various roads and stadiums.
Appearance：
1） The colors of the inner and outer layers of the pipe are uniform, and the outer layer is generally black
2） Bubbles, depressions, obvious impurities and irregular ripples are not allowed on the outer wall of the pipe
3） Both ends of the pipe shall be flat, perpendicular to the axis and located in the trough area
Characteristic：
1） Aging resistance, corrosion resistance and long service life
2） The inner wall is smooth, the flow resistance is small, and there is no scaling
3） Good sealing and not easy to leak
4） Shock resistance
VI. PE wound structural wall pipe
The technical product takes high-density polyethylene resin as the main raw material and is made by hot winding process, with excellent weld quality; Unique socket electrofusion connection technology ensures zero leakage of the interface; The supporting capacity of pipes and fittings is strong, which can form a perfect and zero leakage pipeline system. It is widely used in buried rainwater and sewage pipe network, underground pipe gallery and rainwater and sewage collection system laid underground in various soil environments and different depths.
Appearance：
Characteristic：
1） Strong resistance to chemical corrosion and erosion
2） Good flexibility and strong impact resistance
3） Cold resistance, aging resistance, simple connection, safe and reliable
4） Light weight and convenient construction
5） Strong wear resistance, service life of more than 50 years, and maintenance free within the service life
6） Excellent drainage performance, good sanitation and recyclable
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