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Polyethylene (PE) pipes instructions
Polyethylene (PE) pipes instructions
1、Good hygienic performance: no heavy metal salt stabilizer is added during the processing of the PE pipe. The material quality is non-toxic, without fouling layer and breeding ground for bacteria. Therefore, it perfectly resolves the secondary pollution of urban drinking water.
2、Superb corrosion-resisting properties: it can resist to the erosion of several chemical mediators and non-electrochemical corrosion, but few strong oxidants.
3、Long service life: under the conditions of rated temperature and pressure, PE pipes can have a reliable lifetime of over 50 years.
4、Reliable connection performance: it is with simple welding procedure; unique butt fusion welding technology makes the strength of interface higher than that of the pipe body, so as to ensure the safety and reliability of the interface.
5、Flexibility: the elongation at break of PE pipe is over 500%. Therefore, it has high dynamic resistance, strong shock resistance and resistance to distortion, and cannot be broken under different settlements and earthquakes, with high security.
6、Cold resistance: no physical property would occur even at 20℃ below zero. So, it can be specially adapted to frosting regions.
7、Operational ability: with light weight (only 1/7 of the weight of metal pipe); the PE pipe is convenient for delivery and construction, and the integrated cost of engineering is low.
8、Wear resistance: with small friction coefficient on the smooth inner wall, the carrying capacity of media is relatively enhanced, and it has excellent wear resistant property.
Application area > > >
Urban tapping pipe network system, urban and rural drinking pipeline, etc.
Construction requirements > > >
The construction shall be carried out strictly basing on the requirements of national industry standards Engineering and Technical Procedures of Buried Polyethylene Water Supply Pipe.
Precautions > > >
1、Handle with care when carrying it; avoid oil stain and no contact with other chemicals such as oil, acid, alkali, salt and so on, is permitted.
2、No dramatic impact, touch, casting, falling, rolling, hauling with sharp objects, are permitted.
3、Pipes shall be stored in a warehouse with flattening ground and well ventilation and away from heat, oil and chemicals polluted areas; those stacked outdoors should be covered with anti-antisolar nets and kept away from direct sunshine; the tacking height does not exceed 1.5m.
Specification of excavation and backfilling of pipelining groove > > >
1、It is recommended to refer to this drawing for excavation and supporting of foundation pit for the pipes with the buried depth of less than 3m.
2、Pipelining in the unstable soil layer with high under-ground water level and soft soil needs construction of drainage and slot edge support. The construction technology and measures shall be in line with pertinent regulations of GB 50268.
3、When the PE feed-water piping crosses over other piping (non-heat pipe), the net distance between the piping bottom and the following pipeline shall be no less than 150mm. And it shall be treated with foundation treatment according to the design requirements. When there is no design requirement, the construction shall be carried out by referring to the relevant terms of the GB 50268 Specification.
4、Excavation width of bottom of pipe groove should meet the design requirement (if any), or otherwise, it is better to determine as per the following formula:B= Do +2(b1+b2+b3)Where:
B ----- Excavation width of bottom of pipe groove (mm);
Do----External edge width of pipe structure, i.e. external diameter of pipe (mm);
b1----Face width at pipe side (mm), can be chosen as per (5) table;
b2----Supporting thickness at pipe side can be chosen as 150~200mm, if supporting is required;
b3----Thickness of molded board at pipe side (mm) during concrete or reinforced concrete placement on site.
5、For manual excavation, mound should be better longer than 0.8m away from groove edge, and the height should not exceed 1.5m; earthworks stacked at groove cannot exceed the design height.
6、Generally, foundation pit of lower than 3m can be set with a breast board for construction and that higher than 3m should be set with steel sheet pile for supporting.
7、When there are raffles like wasted building, adamant, wood, and garbage and so on, at the groove bottom, they must be cleaned out prior to laying a layer of sandstone or plain soil with thickness of no less than 150mm. This layer shall be even and compact.
8、The maximum slope of groove should meet the following regulations in the table below, if the geologic condition is good, soil texture is uniform, ground water level is lower than ground elevation of groove, and depth of excavation is within 5m and no support is set in the groove:
Backfilling and degree of compaction as per requirement of road > > >
1、Groove within the scope of the urban area: 95% shall be adopted for the degree of compaction
2、Farmland: 90% shall be adopted for the degree of compaction.
3、Backfilling of medium and coarse sands, and degree of compaction as per 95%
4、Groove within the scope of the urban area: 95% shall be adopted for the degree of compaction
5、Crushed sand cushion, and degree of compaction as per 95%
6、Taking advantage of the piping flexibility for bending laying, when the melting butt or electrocast connection is adopted for pipeline, its bending radius shall meet the requirements in the following table; when there are socket connectors in pipeline, the bending radius of pipeline shall be no less than 125Do.
7、Vertical support should be set in the pipes with the diameter of larger than 800mm during backfill construction.
8、Backfilling materials which need to be mixed should be mixed uniformly before carrying to the groove, and cannot be mixed in the groove. Backfilling materials at two sides of pipe and within 500mm above the pipe top should be carried to the groove symmetrically through two sides of groove, and cannot be backfilled directly on the pipe; for backfilling to other parts, the materials should be carried to the groove uniformly and cannot be pushed in together.
9、Groove backfilling, from foundation part at the bottom of pipe to the top of pipe (within 500mm) must be done manually; parts 500mm above the top of pipe can be tamped mechanically at two sides of pipe axial line at the same time; backfilling height of each layer should not be higher than 200mm. Mechanical backfilling shall be done with the pipe filled with water, and the pipe cannot be empty after backfilling.
10、Measures should be taken for preventing floating and displacement of pipelines for rainy season construction or pipe laying in area with higher ground water level and backfilling below pipe radius.
11、Pipes through important roads and railways, which need metal or concrete sleeve, shall be constructed as per relevant design requirements.
12、For pipes crossing the river, it is better not to cross the river bed directly, but protection sleeves or overhead truss should be set or other protection measures should be taken.