Product Description:
Shandong Donghong Pipe Industry Co., Ltd. presents a superior quality, pre-insulated pipe featuring a robust polyurethane foam core. Specifically crafted for insulating central heating and domestic water pipelines, our piping solution excels in temperature resilience, ranging from -50°C to 135°C. This ensures unparalleled protection and minimal heat loss. The rigid structure guarantees exceptional durability, safeguarding your pipes from potential damage while offering outstanding chemical resistance. This versatility makes it ideal for a multitude of applications.
Our state-of-the-art rigid polyurethane spray polyethylene-wrapped, prefabricated direct-buried insulation pipe stands as a testament to advanced engineering. Featuring enhanced foam density uniformity and consistent insulation layer thickness, this innovative design not only conserves materials but also significantly lowers labor costs. Perfectly engineered for the efficient transport of hot water at temperatures up to 140°C, it represents a cost-effective and reliable solution for your hot water distribution needs.
| 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 pre-insulated pipes boast consistent core indicators such as thickness, density, thermal conductivity, closed cell rate, and water absorption, ensuring exceptional overall stability.
With minimal axis eccentricity and low thermal conductivity, our pipes provide outstanding heat preservation, delivering superior thermal insulation.
Featuring high-reactivity online polyurethane spraying, our insulation pipes bond seamlessly with the steel pipe and outer protective layer. They remain unaffected by temperature changes, eliminating delamination issues.
The insulation layer offers a smooth surface with minimal thickness deviation and a broad adjustment range, ensuring optimal performance.
Our outer protective layer utilizes a polyethylene winding method, providing uniform, thin walls with minimal shrinkage, deformation, and stress. This method enhances the overall mechanical properties and resolves cracking issues.
By reducing the thickness of the polyethylene outer protective layer, we lower costs while maintaining excellent insulation. This reduction significantly decreases deformation and stress, enhancing the protective layer's durability.
At Shandong Donghong Pipe Industry Co., Ltd., we proudly present a groundbreaking pipe solution, meticulously crafted with the following standout features:
1. No requirement for support structures, ensuring minimal heat loss while effectively eliminating the 'support thermal bridge' phenomenon.
2. Exceptional strength and toughness, coupled with easy welding and effortless construction, make our pipes the ideal choice for any project.
3. Boasting low thermal conductivity, outstanding waterproof properties, and incredible corrosion resistance, our pipes are perfect for direct burial in both soil and water.
4. Effortless connection using either flange or quick joint, facilitating a seamless and straightforward installation process.
5. Built to last, our pipes offer impressive durability and a long service life, enduring extreme environments ranging from -20ºC to 120ºC for over three decades.
- At Shandong Donghong Pipe Industry Co., Ltd., our products adhere to, and often surpass, international standards including CE, BV, ISO, and wars certifications. We are committed to meeting your specific national standards through rigorous checks and testing upon request. Trust us to exceed your expectations.
- As a leading manufacturing factory, we provide comprehensive services ranging from pipe products, fittings, and packaging to shipping. Our expertise extends to project consulting, system solutions, and design advice, ensuring a holistic approach to your pipeline needs. Our engineering services also encompass pipeline contracting, repair, and free maintenance guidance.
- We offer extensive OEM/ODM services, enabling customization in materials, specifications, logos, packaging, and connection methods. Our expert team is equipped to provide tailored solution recommendations based on our wealth of successful project experiences.
- Our payment terms are flexible, including T/T or L/C at sight. We stand by the quality of our products by inviting customers to visit our company for firsthand inspections. Furthermore, we perform stringent tests according to customer specifications before orders and provide samples for pre-production testing, ensuring your complete satisfaction.
The Classic Project Cases
Qingdao Haiyang 4.5 Million Square Meters Nuclear Energy Heating Project. This landmark project marks China's first official website dedicated to nuclear energy heating. At its core, the project employs Donghong's innovative spray-wound pre-direct buried thermal insulation pipe. Our products feature a uniform density and energy-saving design, significantly enhancing heating transmission efficiency. These cutting-edge pipes represent a new generation of environmentally friendly construction materials.
Qingdao West Coast Heating Pipeline Network Project.
Financed by the Qingdao West Coast Public Utilities Group with an investment of 217 million yuan, this project features an extensive heating pipeline network. Starting from the Qingdao Special Steel heating first station, the pipeline stretches 8.2 kilometers along the east bank of the Henghe River and the north side of Binhai Avenue, intersecting at the Hongkong Run Avenue and Binhai Avenue Interchange to connect with the Huaneng long-distance heating pipeline. This project integrates industrial park waste heat, industrial waste heat, and clean energy heating solutions, utilizing Donghong's DN1400-DN1200 spray-wound pre-directly buried insulation pipe to pioneer a new era of energy conservation and consumption reduction.
Welcome to the world of Shandong Donghong Pipe Industry Co., Ltd.
Shandong Donghong Pipe Industry Co., Ltd. (known as Donghong Co., Ltd., stock code: 603856) stands as a premier engineering pipeline manufacturer rooted in the culturally rich city of Qufu, China, the birthplace of Confucius. We excel in designing and delivering bespoke pipelines tailored for diverse applications, such as specialized conduits for rainwater and sewage management, municipal sectors, industrial and mining zones, as well as national flagship engineering initiatives.
Our company has forged a comprehensive industrial ecosystem encompassing design institutes, financial entities, port logistics, construction firms, and other critical stakeholders. We are committed to revolutionizing human life through innovative intelligent pipelines and ensuring the utmost safety in pipeline transportation.
Shandong Donghong Pipe Industry Co., Ltd. takes pride in its formidable team of over 200 R&D professionals and boasts an impressive portfolio of more than 100 patents. Utilizing national technology R&D platforms such as the National Enterprise Technology Center, National CNAS Laboratory, Academician Expert Workstation, and Post-doctoral Workstation, Donghong leads the charge in digitalization, informatization, and intelligentization within the pipeline engineering sphere.
Our company spearheads advancements in the engineering pipeline industry and actively participates in significant national strategic projects and public welfare initiatives. Notable endeavors include the South-to-North Water Diversion, Huangzhilin, Hanzhiwei, Beijing-New Zealand Expressway, the One Belt, One Road initiative, 'Two Clear and One Tip,' standardized farmland development, urban and rural water supply integration, Liren gas supply, and centralized heat distribution.
1. Does your product meet international standards?
Our products have passed the CE, BV, ISO, and WARS certifications, with all figures indicating performance above standard requirements. Please let us know the specific national standard you require, and we will check or test our products accordingly.
2. What services do you offer?
As a manufacturing factory, we provide pipe products, fittings, packaging, and shipping. As a professional consulting company, we offer project consultation, pipe system solutions, and design suggestions. Furthermore, as an engineering-focused enterprise, we provide pipeline contracting, repair services, and free maintenance guidance.
3. Do you support OEM/ODM services?
Yes, we offer customization options in material, specification, logo, packaging, connection methods, and more. Our professional team can also provide tailored solution suggestions for your specific projects, backed by successful case studies.
4. What are your terms of payment?
We accept T/T or L/C at sight.
5. How do you guarantee the quality of your products?
We warmly welcome all customers to visit our company and inspect our goods in person. We can also conduct strict tests as per customer requirements before order confirmation. Additionally, before bulk production, we can dispatch samples for customers to conduct their own tests to verify product quality.
){kind=link}