The outer protective layer is meticulously crafted from high-strength, high-toughness polyethylene material. Utilizing Shandong Donghong Pipe Industry Co., Ltd.'s revolutionary polyethylene modification technology, this layer undergoes a surface polarization process that significantly enhances its adhesive compatibility with polyurethane. This innovative approach ensures superior adhesion performance, providing unmatched durability and efficiency in thermal insulation applications. Our pre-insulated pipe systems are engineered to deliver exceptional performance in underground piping, standing up to the most demanding conditions and offering unparalleled efficiency in thermal insulation. Choose Shandong Donghong Pipe Industry Co., Ltd. for cutting-edge solutions that promise longevity, reliability, and optimal thermal performance.
| 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: Meticulously crafted from premium seamless steel pipe, spiral welded pipe, and straight seam welded pipe. Before thermal insulation, our pipes undergo rigorous mechanical rust removal to ensure a quality standard that meets or exceeds GB/T8923.1 Sa level 2.5. This ensures unparalleled reliability and durability.
2. Slepipe: Designed with a proprietary blend of modified flame retardant and anti-static polyethylene resin, processed using advanced single screw extrusion technology. This innovation endows our pipes with exceptional impact resistance, superior isolation properties, and formidable corrosion resistance, making them ideal for demanding applications.
3. Polyurethane Insulation Layer: We employ a cutting-edge modified flame retardant polyurethane foam injected under high pressure to fill the gap between the casing and the working steel pipe. This process creates a superior insulation effect, characterized by exceptionally low thermal conductivity, high compression strength, minimal water absorption, and an impressive closure rate, ensuring optimal thermal performance.
1. Eliminates the need for additional support, significantly reduces heat loss, and completely eradicates the 'support thermal bridge' phenomenon, thereby enhancing energy efficiency.
2. Offers remarkable strength and excellent toughness, coupled with ease of welding and convenient construction, ensuring seamless integration into any project.
3. Exhibits exceptionally low thermal conductivity along with robust waterproof and corrosion resistance properties. This makes it ideally suited for direct burial in the ground or underwater applications, providing versatility and reliability.
4. Ensures straightforward connection through flange or quick joint connections, simplifying the installation process and reducing labor costs.
5. Boasts an impressive service life, enduring in challenging environments with temperatures ranging from -20ºC to 120ºC for over 30 years, ensuring long-term performance and reliability.
Explore a variety of connection methods that enhance the efficiency and reliability of your operations.
| Flange connection |
Flexible socket connection |
Discover our detailed welding joint demonstrations, meticulously designed for seamless integration and robust performance, ensuring your systems operate flawlessly.
Insulation steel pipes are vital in liquid and gas transmission pipe insulation projects across diverse 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 is the premier choice for its exceptional thermal insulation performance, unmatched safety and reliability, and significantly reduced construction costs. Engineered to thrive in the most challenging conditions, these pipes guarantee longevity and efficiency, making them indispensable for both industrial and municipal applications. By choosing our solution, you are investing in state-of-the-art 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, the renowned hometown of Confucius. As a pioneering force in the engineering pipeline sector, we excel as a leading manufacturer, comprehensive service provider, and general contractor. Donghong Co., Ltd. specializes in four main categories of advanced and customized pipeline solutions: rainwater and sewage diversion, municipal, industrial and mining sectors, and critical national engineering projects. We are committed to creating a robust industrial ecosystem, incorporating design institutes, financial bodies, port logistics, construction firms, and both upstream and downstream enterprises, to revolutionize the global pipeline industry. Our mission is to lead with intelligent pipeline solutions that elevate the quality of life and ensure the enduring safety of pipeline transportation.
Donghong takes pride in its team of over 200 R&D experts and an impressive portfolio of more than 100 patents. Our drive for 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 digitalization, informatization, and intelligentization in pipeline engineering, setting new industry benchmarks and propelling the industry toward a future of excellence.
In November 2017, Donghong achieved a historic milestone by being listed on the main board of Shanghai, marking the first-ever listing for engineered composite piping systems in China.
Outstanding Technical Research and Development Capabilities
Our national CNAS laboratory is equipped with cutting-edge testing equipment, facilitating the development of new products, materials, and connection types. This rigorous testing process guarantees 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. Every logistical element is meticulously planned to safeguard the integrity of our products, ensuring they arrive in pristine condition, ready to meet your project's demands.
1. Does your product meet international standards?
Our products not only meet but surpass international standards. Having aced CE, BV, ISO, and WAR certifications, we ensure top-tier quality and reliability. Just let us know your specific national standard requirements, and we will meticulously verify or test them for compliance.
2. What kinds of services do you offer?
As a leading manufacturing factory, we provide an extensive range of pipe products, fittings, and comprehensive packaging and shipping solutions. Additionally, our consultancy services include expert project consulting, innovative pipe system solutions, and detailed design recommendations. Furthermore, our engineering expertise covers pipeline contracting, repair services, and complimentary maintenance guidance, ensuring holistic support for all your needs.
3. Do you support OEM/ODM services?
Absolutely, we offer extensive customization options across materials, specifications, logos, packaging, and connection methods. Our expert team excels in delivering bespoke solutions tailored to your unique projects, demonstrated by numerous successful cases that exemplify our exceptional service.
4. What are your terms of payment?
We accommodate flexible payment options including T/T (Telegraphic Transfer) or L/C (Letter of Credit) at sight, ensuring convenience for our customers.
5. How can you guarantee the quality of your goods?
We warmly welcome customers to visit our facility and inspect our goods firsthand. Furthermore, we are equipped to conduct rigorous tests at your request before finalizing any order. We also provide samples for your testing and approval before bulk production, ensuring our commitment to the highest quality standards.
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