Product Description:
Shandong Donghong Pipe Industry Co., Ltd. presents a top-tier solution for insulating central heating and domestic water pipelines with our high-quality polyurethane-foam tubing. Engineered to withstand extreme temperatures from -50°C to 135°C, this tubing provides unparalleled protection and minimal heat transfer. Its robust construction ensures long-lasting durability and effectively prevents pipe damage. Furthermore, the tubing is highly resistant to chemicals, making it an ideal choice for a wide range of applications.
Our state-of-the-art rigid polyurethane spray polyethylene wrapped prefabricated direct-buried insulation pipe leverages cutting-edge technology to ensure uniform foam density and consistent insulation layer thickness. This groundbreaking design optimizes material usage and reduces labor expenses, offering a highly economical solution for the transportation of hot water at temperatures 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. |
Our Thermal Steel Pipe Insulation Lagging System stands out for its remarkable uniformity in core attributes such as thickness, density, thermal conductivity, closed-cell rate, and water absorption. This uniformity guarantees exceptional overall stability.
With minimal axis eccentricity and impressively low thermal conductivity, our system ensures outstanding heat preservation, delivering superior thermal insulation performance.
The on-line polyurethane spraying process boasts high reactivity, forging a robust bonding with both the steel pipe and the outer protective layer. This results in an insulation pipe that remains unaffected by temperature fluctuations, ensuring no delamination occurs.
The insulation layer features a flawlessly flat surface with minimal thickness deviation, offering a wide adjustment range to meet diverse requirements effectively.
Employing a polyethylene winding method for the outer protective layer, our system guarantees thin, uniform walls with minimal shrinkage, deformation, and stress. This ensures excellent mechanical properties and resolves the issue of cracking in the outer protective layer.
By reducing the thickness of the polyethylene outer protective layer, we achieve significant cost savings. Under identical insulation conditions, this reduction minimizes deformation and stress, allowing for a substantial decrease in the outer protective layer's thickness.
Shandong Donghong Pipe Industry Co., Ltd. presents a groundbreaking solution in pipe technology, showcasing the following unparalleled features:
1. Innovative design with no need for support, ensuring minimal heat loss and eliminating the "support thermal bridge" effect for enhanced efficiency.
2. Exceptional high strength and toughness, combined with ease of welding and convenient construction, make it a superior choice for various applications.
3. Boasting low thermal conductivity, outstanding waterproofing, and excellent corrosion resistance, our system is perfect for direct burial in soil or water.
4. Features a simple connection method with flange or quick joint, ensuring hassle-free installation for any project.
5. Engineered for durability with a long service life, capable of withstanding environments ranging from -20ºC to 120ºC for over 30 years.
- At Shandong Donghong Pipe Industry Co., Ltd., our products meet and exceed international standards such as CE, BV, ISO, and wars certificates. Share the national standard you require, and we will verify or test it to ensure compliance.
- As a comprehensive manufacturing factory, we provide a wide range of pipe products, fittings, packaging, and shipping services. Additionally, we offer professional project consulting, pipe system solutions, and design suggestions. We also excel in pipeline contractor services, pipe repair, and free maintenance guidance, embodying our engineering expertise.
- We offer OEM/ODM services for complete customization, including material, specification, logo, packaging, and connection methods. Our experienced team provides tailored solutions for your specific projects, leveraging successful past cases.
- Our payment terms include T/T or L/C at sight. We stand by the quality of our products, inviting customers to visit and inspect firsthand. Additionally, we conduct rigorous tests as per customer requirements before orders and offer samples for independent testing prior to bulk production.
The Classic Project Cases
Qingdao Haiyang 4.5 Million Square Meters Nuclear Energy Heating Project This groundbreaking initiative stands as China's premier official nuclear energy heating website. Leveraging Donghong's innovative spray-wound, pre-direct buried thermal insulation pipes, this project epitomizes excellence. With uniform density and a commitment to energy savings, these pipes significantly enhance heating transmission efficiency, marking them as a pioneering solution in eco-friendly construction.
Qingdao West Coast Heating Pipeline Network Project
Spearheaded by the Qingdao West Coast Public Utilities Group, this project boasts an impressive investment of 217 million yuan. The heating pipeline extends from the Qingdao Special Steel heating first station, tracing along the east bank of the Henghe River and the north side of Binhai Avenue, covering 8.2 kilometers. Connecting at the Binhai Avenue and Hongkong Run Avenue Interchange to the Huaneng long-distance heating pipeline, this project embraces industrial park waste heat, industrial waste heat, and clean energy heating solutions. Utilizing Donghong DN1400-DN1200 spray-wound pre-directly buried insulation pipes, it establishes a new benchmark in energy conservation 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 an industry leader in engineering pipeline manufacturing, headquartered in the historic city of Qufu, China-the birthplace of Confucius. Our expertise lies in crafting bespoke pipeline solutions for a wide range of applications, from rainwater and sewage diversion to municipal, industrial, and mining infrastructures, as well as critical national engineering projects.
At Shandong Donghong Pipe Industry Co., Ltd., we have fostered a dynamic industrial ecosystem encompassing design institutes, financial institutions, port logistics, construction units, and other vital stakeholders. Our mission is to revolutionize human life through innovative pipeline solutions, ensuring unparalleled safety and reliability in pipeline transportation.
Shandong Donghong Pipe Industry Co., Ltd. takes pride in its elite team of over 200 R&D experts and an impressive portfolio of more than 100 patents. By harnessing the power of premier national technology R&D platforms-including the National Enterprise Technology Center, National CNAS Laboratory, Academician Expert Workstation, and Post-doctoral Workstation-Donghong remains at the cutting edge of digitalization, informatization, and intelligentization within the pipeline engineering sector.
As pioneers in the engineering pipeline industry, our company plays an instrumental role in advancing national strategic projects and enhancing public welfare. Our notable contributions include the South-to-North Water Diversion Project, Huangzhilin, Hanzhiwei, Beijing-New Zealand Expressway, One Belt, One Road Initiative, 'Two Clear and One Tip' project, standardized farmland, urban-rural water supply integration, Liren gas, and centralized heat supply systems.
1. Is your product meets the international standard ?
Our products have passed CE, BV, ISO, and WARS certifications, all surpassing the standard requirements. Feel free to inform us of any specific national standards you need; we will verify or test our products accordingly to meet your expectations.
2. What kind of service do you offer ?
As a manufacturing factory, we provide comprehensive pipe products, pipe fittings, packaging, and shipping services. As a professional consultation company, we offer project consulting advice, pipe system solutions, and design suggestions. Furthermore, as an engineering-focused enterprise, we provide pipeline contractor services, pipe repair services, and free maintenance guidance.
3. Do you support OEM/ODM service?
Yes, we offer customization in materials, specifications, logos, packaging, connection methods, and more. Additionally, our expert team can provide tailored solutions for your specific projects, boasting numerous successful case studies.
4. What's your terms of payment?
We accept T/T or L/C at sight.
5. How can you guarantee the goods you offered are qualified?
We warmly welcome all customers to visit our company and inspect our goods firsthand. We can also conduct rigorous tests as per customer requirements before order placement. Additionally, before bulk production, we can dispatch samples for customer testing to ensure product quality.
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