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, making it the pinnacle of innovation in the industry.
| 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 with meticulous precision, our premium seamless steel pipes, spiral welded pipes, and straight seam welded pipes are subjected to rigorous mechanical rust removal before thermal insulation. Meeting or exceeding GB/T8923.1 Sa level 2.5 standards, these pipes deliver unparalleled reliability and durability, ensuring they stand the test of time.
2. Slepipe: Our innovative Slepipe is engineered with a proprietary blend of modified flame retardant and anti-static polyethylene resin, processed through state-of-the-art single screw extrusion technology. This results in pipes with exceptional impact resistance, superior isolation properties, and formidable corrosion resistance, perfectly suited 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 advanced process yields a superior insulation effect with exceptionally low thermal conductivity, high compression strength, minimal water absorption, and an impressive closure rate, ensuring optimal thermal performance.
1. Our pipe system eliminates the need for additional support, significantly cutting down heat loss and eradicating the 'support thermal bridge' phenomenon, thereby enhancing overall energy efficiency.
2. Our pipes offer remarkable strength and excellent toughness, coupled with ease of welding and convenient construction, ensuring seamless integration into any project, making installation straightforward and efficient.
3. With exceptionally low thermal conductivity, robust waterproofing, and corrosion-resistant properties, our pipes are ideally suited for direct burial in the ground or underwater applications, providing unmatched versatility and reliability.
4. The design ensures straightforward connection through flange or quick joint methods, simplifying the installation process and significantly reducing labor costs, making it both time and cost-efficient.
5. Our pipes boast an impressive service life, performing reliably in challenging environments with temperatures ranging from -20ºC to 120ºC for over 30 years, ensuring long-term durability and performance.
Discover an array of advanced connection methods designed to significantly boost the efficiency and reliability of your operations. Elevate your system's performance with our expertly engineered solutions.
| Flange connection |
Flexible socket connection |
Experience a comprehensive welding joint demonstration that ensures seamless integration and robust performance for your projects. Trust in our precision to deliver unparalleled durability and strength.
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. We are a forefront leader in the engineering pipeline sector, excelling as a manufacturer, comprehensive service provider, and general contractor. Our core business encompasses four main categories of specialized and bespoke pipeline solutions: rainwater and sewage diversion, municipal, industrial and mining sectors, and vital national engineering projects. By constructing a robust industrial ecosystem that incorporates design institutes, financial bodies, port logistics, construction firms, and both upstream and downstream enterprises, Donghong Co., Ltd. aims to revolutionize the global pipeline industry. Our mission is to lead the way with 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 boasting 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 digitalization, informatization, and intelligentization of pipeline engineering, propelling the industry forward and setting new benchmarks of excellence.
In November 2017, Donghong celebrated a landmark achievement by being listed on the main board of Shanghai, a historic 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 apparatus, 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 forged strategic alliances with more than five top-tier 5A-level logistics companies, known for their exceptional transportation expertise. By leveraging a sophisticated network of automobile, railway, port, and maritime logistics, we deliver unmatched service, no matter the extreme temperatures or remote locations. Our comprehensive transportation strategy ensures punctual delivery to your site, upholding the utmost standards of efficiency and reliability.
1. Does your product meet international standards?
Our products not only meet but surpass international standards, having successfully passed CE, BV, ISO, and WAR certifications. Specify the national standard you require, and we will either verify or test to ensure compliance. We are committed to delivering the highest quality and reliability.
2. What kinds of services do you offer?
As a versatile manufacturing factory, we offer a wide range of pipe products, fittings, and comprehensive packaging and shipping solutions. Beyond manufacturing, our consultancy services provide expert project consultation, innovative pipe system solutions, and detailed design recommendations. As an engineering-focused enterprise, we specialize in pipeline contracting, repair services, and provide free maintenance guidance, ensuring all-encompassing support for your needs.
3. Do you support OEM/ODM services?
Absolutely, we provide extensive customization options including materials, specifications, logos, packaging, and connection methods. Our expert team is adept at delivering personalized solutions for your unique projects, evidenced by numerous successful cases showcasing our outstanding service.
4. What are your terms of payment?
We offer flexible payment options including T/T (Telegraphic Transfer) or L/C (Letter of Credit) at sight, ensuring convenience and flexibility.
5. How can you guarantee the quality of your goods?
We warmly welcome customers to visit our company and inspect our goods firsthand. We can also perform rigorous tests upon your request before the order is finalized. Additionally, we offer samples before bulk production for your testing and approval, ensuring that the highest quality standards are consistently met and your satisfaction is guaranteed.
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