The high density polyethylene resins are continuously extruded by extruders and specially designed molds, which form the rigid HDPE dredge pipes.
The HDPE dredge pipes are high in performance, light in weight, easy to transport and install, and do not require large-scale mechanical construction. The length of each section can be made arbitrarily according to user needs. It has high wave resistance, ring stiffness, and high tensile strength. It can withstand the impact of wind and waves on the sea, has minimum water resistance coefficient, low resistance to transport sand. With good performance, high chemical stability, it can withstand various corrosive media (acid, alkali, salt, etc.) within a certain temperature and concentration range.
HDPE dredge pipes are widely used for dredging industries, dredger pipelines, sand pumping pipelines, etc.
With dredging becoming more and more popular today, HDPE pipe has become the most ideal choice for transporting liquids under pressure with a mixture of water and inert materials such as clay, silt, sand, gravel, and large size solids. HDPE dredging pipe is made of high density polyethylene material and can be produced in a variety of sizes. The dredge pipe is manufactured and welded from two HDPE flange adapters and two steel flanges, also known as "HDPE flange pipe", where the two pipes can be easily joined together by flanges and covered with floats to keep them afloat. Dredge pipe is the preferred choice for agricultural applications, mud dredging, and mining projects. Dredged HDPE pipes are used with floats filled with polyurethane (foam) material.
As an ideal solution for dredging jobs, HDPE dredge pipe has many remarkable advantages:
1. Excellent Corrosion resistance: with various organic solvents, HDPE pipes have high resistance to various acid and alkali corrosion, especially in corrosive sea waters, no need for corrosive maintenance as steel pipes.
2. Largely reduce pumping costs: with the friction coefficient of 0.009, the internal surface of HDPE pipe is very smooth, which decrease the flow resistance of the water; and the non-adhesion property also enables HDPE pipe to have higher transmission efficiency, about at least 20% reduce the pumping costs.
3. Largely reduced maintenance costs: With good properties of wear resistance, corrosive resistance, low-temperature resistance, the HDPE pipelines will not need the daily maintenance of anti-rust, antifreeze, scaling cleaning, etc, which could save 95% costs for maintenance during the operation.
4. Light in weight and easy connection: with the density of 0.94g/cm3, the weight of HDPE pipe is 1/8 of steel pipes, furthermore, the HDPE pipes can be connected by steel flanges or by fusion welding, which will be easier to do at the job sites, largely reduce labor costs
5. Anti-aging with longer service life: 2-2.5% carbon black will be uniformly mixed in the raw material to make it sunproof to have a longer service life.
Some common uses of HDPE dredge pipe:
> Silt, Mud, Slag, slurry transfer pipe;
> Sand pumping pipe;
> dredger pipeline
> dredging and reclamation projects
> deepening and cleaning up a job for river, lake
|
Nominal Diameter (mm) |
Wall Thickness (mm) |
||||||
|
SDR26 |
SDR21 |
SDR17 |
SDR13.6 |
SDR11 |
SDR9 |
SDR7 |
|
|
PN6 |
PN8 |
PN10 |
PN12.5 |
PN16 |
PN20 |
PN25 |
|
|
110 |
4.2 |
5.3 |
6.6 |
8.1 |
10.0 |
12.3 |
15.1 |
|
160 |
6.2 |
7.7 |
9.5 |
11.8 |
14.6 |
17.9 |
21.9 |
|
200 |
7.7 |
9.6 |
11.9 |
14.7 |
18.2 |
22.4 |
27.3 |
|
225 |
8.6 |
10.8 |
13.4 |
16.6 |
20.5 |
25.2 |
30.8 |
|
250 |
9.6 |
11.9 |
14.8 |
18.4 |
22.7 |
27.9 |
34.2 |
|
280 |
10.7 |
13.4 |
16.6 |
20.6 |
25.4 |
31.3 |
38.3 |
|
315 |
12.1 |
15.0 |
18.7 |
23.2 |
28.6 |
35.2 |
43.0 |
|
400 |
15.3 |
19.1 |
23.7 |
29.4 |
36.3 |
44.7 |
54.6 |
|
450 |
17.2 |
21.5 |
26.7 |
33.1 |
40.9 |
50.3 |
61.5 |
|
500 |
19.1 |
23.9 |
29.7 |
36.8 |
45.4 |
55.8 |
-- |
|
560 |
21.4 |
26.7 |
33.2 |
41.2 |
50.8 |
62.5 |
-- |
|
630 |
24.1 |
30.0 |
37.4 |
46.3 |
57.2 |
70.3 |
-- |
|
710 |
27.2 |
33.9 |
42.1 |
52.2 |
64.5 |
79.3 |
-- |
|
800 |
30.6 |
38.1 |
47.4 |
58.8 |
72.6 |
89.3 |
-- |
|
900 |
34.4 |
42.9 |
53.3 |
66.2 |
81.7 |
-- |
-- |
|
1000 |
38.2 |
47.7 |
59.3 |
72.5 |
90.2 |
-- |
-- |
|
Physical Properties of HDPE pipe |
||
|
Elongation at break of HDPE pipe |
≥350 % |
ISO 6259 |
|
Longitudinal reversion of HDPE pipe (100±2℃) |
≤3% |
ISO 2505 |
|
Oxidation induction time of HDPE pipe (200℃) |
≥20min. |
ISO 11357-6:2002
|
|
Melt Flow Rate of HDPE pipe (5Kg,190℃,10min.) |
Change of MFR by processing±20% |
ISO 1133:2005 |
|
Mechanical Properties of HDPE pipe |
|||
|
Hydrostatic strength of HDPE pipe at 20℃
|
For PE100 Pipe |
20℃, 100h, 12.4Mpa No leak, No break |
ISO 1167 |
|
Hydrostatic strength of HDPE pipe at 80℃
|
For PE100 Pipe |
80℃, 165h, 5.4Mpa No leak, No break |
ISO 1167 |
► Package included 8.8 grade galvanized bolts and nuts, rubber gaskets for the connection of the pipelines
► Optional butt fusion welding machines, stub device, crane hoist, etc
► HDPE dredging pipes, equipped with or without collars and swivel flanges. Ideal in combination with pipe floater for slurry and sand dredging applications.
Dredging engineering refers to dredging, widening or digging deep rivers and lakes and other water areas, using manpower or machinery to carry out underwater earth and rock excavation projects. The main function of the dredging pipeline is to clean up and transport silt, mud and other mixed debris.
Traditional dredging pipelines are usually steel pipelines, but steel pipelines are prone to rust, corrosion, and high water transportation costs. As engineering requirements become higher and higher, such steel pipelines gradually cannot meet the market requirements. Thus, HDPE dredging pipe came into being. HDPE dredge pipes are corrosion resistant, light in weight, with minimum pumping costs and maintenance costs.
Comparisons between HDPE dredge pipes and Steel pipes
|
Pipe Type |
Sanitation and Environment Friendly |
Flexibility |
Corrosion resistance, anti-aging |
Water transmission property |
Installation |
Pressure capability |
Abrasion resistance |
|
HDPE Pipe |
Hygienic and non-toxic, no fouling and bacteria; waste materials can be recycled thermoplastics, which are environmentally friendly products |
The pipe has good flexibility, and the bottom layer of reinforcement is not required for buried installation |
Good acid resistance, alkali resistance, chemical corrosion resistance and excellent soil electrochemical corrosion resistance; poor aging resistance; service life up to 50 years |
The inner wall is smooth, the roughness is 0.007, the surface of the substrate HDPE is smooth does not scale, and has a strong flow capacity. The head loss can be increased by more than 20% compared with the steel pipe. |
Hot melt socket connection, flange connection, convenient, good sealing |
Good |
The wear resistance of HDPE pipe is 4 times that of steel pipe |
|
Steel Pipe |
Poor sanitary performance, long-term use of the inner wall of the pipe is easily affected by the conveying liquid, corrosion, bacteria breeding, and peculiar smell; The phenomenon of "black water, yellow water" is easily corroded during water delivery, and there is secondary pollution |
Rigidity is good, flexibility is insufficient, when laying in the ground, high requirements for trenches, complicated installation |
1. It is difficult to deal with the anti-corrosion treatment in the pipeline and the welding place, the local anti-corrosion performance is poor, and the anti-corrosion engineering cost is expensive; 2. Steel pipe anti-corrosion treatment, handling, storage, construction, use, and susceptible factors, climate factors and other environmental influences cause anti-corrosion damage and corrosion, leading to failure of the pipe network; the service life is only 15 years |
The inner wall is rough, the water resistance is large, and it is easy to scale and cause the water passing capacity to decrease. The roughness coefficient is 0.013 |
1. The pipeline adopts electric welding or flange connection, which is prone to weld oxidation and fluid corrosion and cracking; 2. When welding, human factors are large, the operation is complicated, and the labor intensity is high |
Very High |
Ordinary mild steel pipe has poor wear resistance |
Thailand, Indonesia, Malaysia, Phillippine, Chile, Peru, Colombia, Uruguay, Paraguay;
Nigeria, Tanzania, Ivory Coast, South Africa, Netherlands, Ireland, USA, Canada, India, United Arab
After 15 years of development, Valor Pipe has become one of the leading manufacturers and suppliers of HDPE dredge pipes and HDPE gas pipes in China. Our factory has introduced many advanced technologies and equipment. Please feel free to buy our high quality and low price products made in China. For any questions about our products, please feel free to contact us!
