The outer protective layer of our Industrial pre-insulated pipe with polyurethane foam insulation is meticulously crafted from high-strength, high-toughness polyethylene material. Leveraging Shandong Donghong Pipe Industry Co., Ltd.'s groundbreaking polyethylene modification technology, this layer undergoes an advanced surface polarization process. This sophisticated technique significantly boosts its adhesive compatibility with polyurethane, ensuring superior adhesion performance. The result? Unmatched durability and exceptional efficiency in thermal insulation applications, setting a new industry standard.
| 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. |
1. Working Steel Pipe: Crafted from the finest seamless steel, spiral welded, and straight seam welded pipes, our products undergo extensive mechanical rust removal before thermal insulation. Complying with or exceeding the stringent GB/T8923.1 Sa level 2.5 standards, these pipes are engineered for exceptional reliability and enduring durability.
2. Slepipe: Featuring an exclusive blend of modified flame retardant and anti-static polyethylene resin, our Slepipe is processed with state-of-the-art single screw extrusion technology. This ensures superior impact resistance, exceptional isolation, and formidable corrosion resistance, making it perfect for the most demanding applications.
3. Polyurethane Insulation Layer: Utilizing cutting-edge modified flame retardant polyurethane foam, we inject it under high pressure to fill the gap between the casing and the working steel pipe. This process results in an unparalleled insulation effect, characterized by ultra-low thermal conductivity, high compression strength, minimal water absorption, and an impressive closure rate, ensuring optimal thermal efficiency.
1. Elimination of Additional Support: Our design negates the need for extra support, dramatically reducing heat loss and completely eradicating the 'support thermal bridge' phenomenon. This enhancement significantly boosts energy efficiency.
2. Strength and Toughness: With outstanding strength and excellent toughness, our pipes are easy to weld and simple to construct, ensuring seamless and efficient integration into any project.
3. Thermal Conductivity and Durability: Exhibiting extremely low thermal conductivity alongside robust waterproof and corrosion resistance, our pipes are ideally suited for direct burial in-ground or underwater applications, providing unmatched versatility and reliability.
4. Simplified Installation: Designed for straightforward connection through flange or quick joint connections, our pipes simplify the installation process, significantly reducing labor costs.
5. Longevity: Our pipes boast an impressive service life, thriving in challenging environments with temperatures ranging from -20ºC to 120ºC for over 30 years. This ensures long-term performance and unwavering reliability.
Discover a comprehensive range of connection methods meticulously designed to elevate the efficiency and enhance the reliability of your industrial operations.
| Flange connection |
Flexible socket connection |
Experience a thorough, detailed welding joint demonstration, ensuring seamless integration and unmatched robust performance for your projects.
Insulation steel pipes are indispensable in liquid and gas transmission pipe insulation projects across various sectors such as petroleum, chemical industries, central heating systems, heating networks, central air-conditioning ventilation pipes, and municipal engineering. Our high-temperature prefabricated direct-buried thermal insulation steel pipe stands out as a premier choice, offering exceptional thermal insulation performance, unparalleled safety and reliability, and notably reduced construction costs. Specifically designed to excel in the most demanding conditions, these pipes ensure longevity and efficiency, making them an invaluable asset for industrial and municipal applications alike. By choosing our solution, you are making a wise investment in cutting-edge technology, superior engineering, and sustainable infrastructure.
Shandong Donghong Pipe Industry Co., Ltd. (referred to as: Donghong Co., Ltd., stock code: 603856) is headquartered in the historic city of Qufu, China, famously known as the hometown of Confucius. As a paramount leader in the engineering pipeline sector, we excel as a manufacturer, comprehensive service provider, and general contractor. Our expertise spans four main categories of specialized and customized pipeline solutions: rainwater and sewage diversion, municipal, industrial and mining sectors, and critical national engineering projects. We are committed to revolutionizing the global pipeline industry by creating a robust industrial ecosystem that seamlessly integrates design institutes, financial bodies, port logistics, construction firms, and both upstream and downstream enterprises. At Donghong Co., Ltd., our mission is to spearhead intelligent pipeline solutions that elevate the quality of life and ensure the enduring safety of pipeline transportation.
Donghong takes immense pride in its team of over 200 R&D experts and an impressive portfolio of more than 100 patents. Our innovation is fueled by national technology platforms such as the enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. We are at the forefront of pioneering the digitalization, informatization, and intelligentization of pipeline engineering, driving the industry forward and setting new benchmarks of excellence.
In November 2017, Donghong reached a historic milestone by being listed on the main board of Shanghai, marking an unprecedented first for engineered composite piping systems in China.
Outstanding Technical Research and Development Capabilities
Our national CNAS laboratory is equipped with state-of-the-art testing facilities, enabling the development of innovative products, materials, and connection types. This rigorous testing ensures that our product quality remains consistently stable and reliable, underscoring our unwavering commitment to excellence.
Donghong has established strategic partnerships with over five elite 5A-level logistics companies, boasting extensive expertise in transportation. Utilizing a dynamic blend of automobile, railway, port, and shipping logistics, we ensure unparalleled service, regardless of extreme temperatures or challenging locations. Our robust transportation strategy guarantees timely delivery to your site, maintaining the highest standards of efficiency and reliability.
1. Does your product meet international standards?
Our products have successfully passed CE, BV, ISO, and WAR certifications, surpassing all international standards. Specify any national standard you require, and we will verify or test it to ensure compliance, guaranteeing unparalleled quality and reliability.
2. What kinds of services do you offer?
As a diversified manufacturing enterprise, we provide an extensive range of pipe products, fittings, packaging, and shipping solutions. In our consultancy role, we offer expert project consulting, cutting-edge pipe system solutions, and detailed design recommendations. Additionally, as an engineering-focused enterprise, we excel in pipeline contracting, repair services, and free maintenance guidance, ensuring comprehensive and tailored support for all your needs.
3. Do you support OEM/ODM services?
Absolutely, we offer extensive customization options in materials, specifications, logos, packaging, and connection methods. Our expert team specializes in delivering bespoke solutions for your unique projects, backed by numerous successful case studies that highlight our exceptional service.
4. What are your terms of payment?
We accept T/T (Telegraphic Transfer) or L/C (Letter of Credit) at sight, providing flexible and convenient payment options tailored to your needs.
5. How can you guarantee the quality of your goods?
We warmly invite all customers to visit our company and inspect our goods firsthand. We also conduct rigorous tests upon request before any order. Additionally, we can provide samples before bulk production for your testing and approval, ensuring the highest quality standards and your complete satisfaction.
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