Product Description:
Shandong Donghong Pipe Industry Co., Ltd. offers high-quality polyurethane-foam tubing designed for insulating central heating and domestic-water pipelines. This tubing is resistant in temperatures ranging from -50°C to 135°C, providing excellent protection and low heat transfer. The rigid construction ensures durability and prevents damage to pipes. Additionally, the tubing boasts a high level of chemical resistance, making it suitable for various applications.
Our rigid polyurethane spray polyethylene wrapped prefabricated direct-buried insulation pipe utilizes advanced technology to enhance foam density uniformity and insulation layer thickness consistency. This innovative design not only saves materials but also reduces labor costs, making it a cost-effective solution for transporting hot water up to 140°C.
| 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:
1. No need for support, minimal heat loss, and eliminates the "support thermal bridge" effect.
2. High strength, excellent toughness, easy welding, and convenient construction.
3. Low thermal conductivity, superior waterproofing, and corrosion resistance for direct burial in soil or water.
4. Simple connection using flange or quick joint for easy installation.
5.Durable with a long service life, suitable for environments ranging from -20ºC to 120ºC for over 30 years.
- Our products at Shandong Donghong Pipe Industry Co., Ltd. meet international standards such as CE, BV, ISO, and wars certificates. We ensure that all our products exceed these standards. Feel free to let us know the national standard you require, and we will check or test it for you.
- As a manufacturing factory, we offer pipe products, pipe fittings, packaging, and shipping services. Additionally, as a professional consultation company, we provide project consulting advice, pipe system solutions, and design suggestions. We also offer pipeline contractor services, pipe repair services, and free maintenance guidance as an engineering-focused enterprise.
- We support OEM/ODM services, allowing customization in material, specification, logo, package, connection methods, and more. Our professional team can provide solution suggestions for your specific projects based on successful past cases.
- Our terms of payment include T/T or L/C at sight. We guarantee the quality of our goods by welcoming customers to visit our company and inspect the products firsthand. We also conduct strict tests as per customer requirements before orders and provide samples for customers to conduct their own tests before bulk production.
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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