DHPI PVC pre- insulated pipe insulation technology is one piece, factory applied in a controlled environment. insulated, pre-insulated pipe utilizes a Polyethylene Jacket designed for above or below ground applications. Pipe freeze protection systems, Urecon heat tracing systems involving plastic pipe involve a Constant wattage cable system and thermostat control to only turn on when required.
Product Description:
Shandong Donghong Pipe Industry Co., Ltd.
Polyvinyl chloride outer protection pipe rigid polyurethane foam prefabricated buried insulation pipe using polyvinyl chloride pipe as the outer protection pipe of the insulation pipe to protect the insulation layer and the working steel pipe from water, moisture erosion and mechanical damage, compared with the traditional PE outer protection insulation pipe has superior performance, good thermal insulation performance, long-term operation to save a lot of energy, and has better waterproofing and corrosion resistance, can be directly buried in the ground, the construction is convenient and quick. Convenient and quick construction.
PVC external insulation pipe has many advantages, as follows:
(1) not easy to delamination: Trinity bonding degree is good, solubility parameters of polyvinyl chloride (PVC) 19.2-19.8, polyurethane 20.4, similar to the principle of solubility PVC and polyurethane bonding force is better, PVC outer protection pipe and the combination of the thermal insulation layer is not easy to delamination of the problem;
(2) good thermal insulation effect: PVC outer tube strength, high strength, outer tube molding and foaming does not collapse, inside and outside the pipe concentricity is high, the thickness of the insulation layer is uniform and consistent. There will be no eccentricity phenomenon, the thermal insulation effect is more excellent;
(3) excellent stress cracking resistance: insulation pipe polyurethane foam process will produce stress, stress uneven release and stress is too large prone to stress cracking phenomenon of the outer layer, PVC material stress cracking resistance superior performance will not appear stress cracking problem;
(4) excellent abrasion resistance: PVC material abrasion resistance is better than PE, and material strength and rigidity is far better than PE material, in the pipe construction and application of the relative effect will be better.
(5) good weather resistance: PVC material weather resistance is even better, for non-buried use of insulation pipe, PVC weatherproof outer products in the outdoor long-term service life can reach ≥ 30 years.
(6) cost-effective: PVC material economy is good, the use of PVC outer protection of the insulation pipe is inexpensive, product performance is more superior at the same time more cost-effective
| Working Steel Pipe Diameter mm |
Outer Sheath Diameter mm |
Minimum thickness of outer sheath mm |
Insulation layer thickness mm |
| 426 |
494-554 |
4.0 |
30-60 |
| 478 |
547-607 |
4.5 |
30-60 |
| 529 |
598-658 |
4.5 |
30-60 |
| 630 |
700-760 |
5.0 |
30-60 |
| 720 |
790-850 |
5.0 |
30-60 |
| 820 |
891-951 |
5.5 |
30-60 |
| 920 |
992-1052 |
6.0 |
30-60 |
| 1020 |
1093-1153 |
6.5 |
30-60 |
| 1120 |
1194-1254 |
7.0 |
30-60 |
| 1220 |
1316-1436 |
8.0 |
40-100 |
| 1420 |
1538-1678 |
9.0 |
50-120 |
| 1620 |
1760-1880 |
10.0 |
60-120 |
| 1820 |
1960-2080 |
10.0 |
60-120 |
| Note: can be customized as customer's needs. |
Core indicators such as thickness, density, thermal conductivity, closed cell rate and water absorption are uniform, and the overall stability is good.
The axis eccentricity is small, the thermal conductivity is low, and the overall heat preservation effect is good.
The online spraying of polyurethane has high reactivity, good bonding effect with the steel pipe and the outer protective layer, and the insulation pipe is little affected by temperature change, and no delamination phenomenon occurs.
The surface of the insulation layer is flat, the thickness deviation is small, and the adjustment range is large.
The outer protective layer adopts polyethylene winding method, the wall is thin and uniform, the shrinkage rate is small, the deformation and stress are small, the overall mechanical properties are good, and the problem that the outer protective layer is easy to crack is solved.
Reduce the thickness of polyethylene outer protective layer, save cost, under the same insulation conditions, reduce the deformation and stress of the outer protective layer, the thickness of the outer protective layer can be greatly reduced.
Shandong Donghong Pipe Industry Co., Ltd. offers a revolutionary pipe solution with the following key features:
PVC outer sheath insulation pipe compared with PE outer sheath insulation pipe, the specific advantages are as follows:
1. PVC material and insulation layer polyurethane bonding degree is good: not easy to appear delamination. Among them, the solubility parameters: polyethylene 16.1-16.5; polyvinyl chloride (PVC) 19.2-19.8; polyurethane 20.4. similar to the principle of solubility PVC and polyurethane bonding than PE material is much better, the product does not need to corona polarization treatment in the processing (processing effect will be better).
2. Good uniformity and consistency of the foam layer, good quality stability: PVC pipe strength, PVC pipe roundness is far better than HDPE pipe, pipe roundness is high at the same time in the foaming process is easier to process, the foam layer uniformity and consistency of the foam layer, quality stability, consistency, good heat preservation.
3. better thermal insulation: polyethylene (PE) thermal conductivity 0.33 W / (m-K), polyvinyl chloride (PVC) 0.16 W / (m-K), from the thermal conductivity analysis of the same wall thickness, PVC material sheath pipe heat loss compared to the PE sheath pipe this for its 1/2. better thermal insulation, energy saving and consumption.
4. excellent stress cracking resistance: two-step method and spray winding two processing methods exist between the outer sheath and the insulation layer of stress concentration problems, stress is too large or the outer sheath of stress cracking resistance is not good may occur in the case of outer sheath cracking (PE regeneration of the material is more prominent in this case) PVC stress cracking resistance is better than the PE material is not easy to appear such problems occur.
- 5. Excellent abrasion resistance: the abrasion resistance of PVC material is better than PE, the strength and rigidity of PVC material is far better than PE material, the relative effect in the pipe construction and application will be better.
Good weather resistance: PVC material to do outdoor use of weather resistance is more excellent, for non-buried use of insulation pipe, PVC sheath can be made into a weather-resistant products, long-term service life in the outdoors can reach ≥ 30 years.
6. Foaming process processing performance is more excellent: because PVC pipe strength, in the same outer diameter of the same wall thickness, the pipe roundness is high at the same time in the foaming process is easier to process, product molding and stability is relatively better.
7. Cost advantage: PVC has a certain price advantage over PE materials. Because the processing cost is close, only compare the material cost, PVC material cost: PE material cost = 0.691, that is, the material cost compared to PE reduced by 30.9%.
8. to solve the problem of recycled materials: PE sheath insulation pipe industry, the biggest problem for the use of outsourcing recycled materials PE material production sheath, quality and long-term use of the huge hidden dangers. pvc material is cheap and inexpensive, there is no use of outsourcing recycled materials problem.
The Classic Project Cases
Qingdao Haiyang 4.5 million square meters nuclear energy heating project. It is the first official website of nuclear energy heating in China, and the project uses Donghong's new spray-wound pre-direct buried thermal insulation pipe. These products, uniform density, energy saving, greatly improving the heating transmission energy efficiency, is a new type of environmentally friendly construction products.
Qingdao West Coast Heating Pipeline Network Project.
The project by the Qingdao West Coast Public Utilities Group invested 217 million yuan construction, the project from Qingdao Special Steel heating first station out of the line, along the east bank of the Henghe River and the north side of the Binhai Avenue to the east laying of heating pipeline 8.2 kilometers in the Binhai Avenue and the Hongkong Run Avenue Interchange access to Huaneng long-distance heating pipeline. Active access to industrial park waste heat, industrial waste heat and clean energy heating, the project uses Donghong DN1400-DN1200 spray-wound pre-directly buried insulation pipe, together to create a new concept of energy saving and consumption reduction.
Welcome to Shandong Donghong Pipe Industry Co., Ltd.
Shandong Donghong Pipe Industry Co., Ltd. (referred to as Donghong Co., Ltd., stock code: 603856) is a leading engineering pipeline manufacturer based in Qufu, China, the hometown of Confucius. We specialize in designing and providing customized pipelines for various applications, including special pipelines for rainwater and sewage diversion, municipal areas, industrial and mining areas, and national key engineering projects.
Our company has established a robust industrial ecosystem that involves design institutes, financial institutions, port logistics, construction units, and other key stakeholders. We are dedicated to transforming human life through intelligent pipelines and ensuring the safety of pipeline transportation.
Shandong Donghong Pipe Industry Co., Ltd. boasts a team of over 200 R&D experts and holds more than 100 patents. Leveraging national technology R&D platforms such as the National Enterprise Technology Center, National CNAS Laboratory, Academician Expert Workstation, and Post-doctoral Workstation, Donghong is at the forefront of digitalization, informatization, and intelligentization in pipeline engineering.
Our company leads the development of the engineering pipeline industry and actively contributes to national key strategic projects and people's livelihood initiatives, including the South-to-North Water Diversion, Huangzhilin, Hanzhiwei, Beijing-New Zealand Expressway, One Belt, One Road, "Two Clear and One Tip", standardized farmland, urban and rural water supply integration, Liren gas, and centralized heat supply.
1. Is your product meets the international standard ?
Our products have pass CE, BV, ISO and wars certificate, and all figures indicates higher than standard, you can feel free to let us know which national standard you required, we will check or test it for you.
2. What kind of service do you offer ?
As a manufacture fatory, we provide pipe products, pipe fittings, package and shipping; as a professional consulation company we provide project consulting advise, pipe system solutions and design suggestions; as an engineering focused enterprise , we also provide pipeline contractor service and pipe repair service, also can give free maintance guidance.
3. Do you support OEM/ODM service?
Yes, we offer customization in material, specification, logo, package , connection methods andothers. Meanwhile, our professional team can offer solution suggestion for your specified projects, we have successfull cases of that service.
4. What's your terms of payment?
T/T or L/C at sight.
5. How can you gurantee the goods you offered is qualified?
We warmly welcome all customers arrange the visit to our company and see our goods in sight, we can also provide strict test as per customer required before order. Meanwhile, before the bulk production, we can dispatch samples for customer to do their own tests to qualify the products.
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