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 with high thermal conductivity is the ideal choice for advanced underground piping solutions, ensuring long-lasting thermal integrity and optimal 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: Expertly engineered from top-tier seamless steel pipe, spiral welded pipe, and straight seam welded pipe, our products undergo stringent mechanical rust removal before thermal insulation. This ensures compliance with or surpasses the GB/T8923.1 Sa level 2.5 standard, guaranteeing unmatched reliability and long-lasting durability.
2. Slepipe: Formulated with a unique blend of modified flame retardant and anti-static polyethylene resin, and crafted using state-of-the-art single screw extrusion technology. This innovation imparts excellent impact resistance, superior isolation, and outstanding corrosion resistance, making our pipes perfect for rigorous applications.
3. Polyurethane Insulation Layer: Utilizing advanced modified flame retardant polyurethane foam, injected under high pressure, to fill the gap between the casing and the working steel pipe. This sophisticated process results in superior insulation with extremely low thermal conductivity, high compression strength, minimal water absorption, and an impressive closure rate, thereby ensuring optimal thermal efficiency.
1. Eliminates the necessity for additional support, significantly curtails heat loss, and completely eradicates the 'support thermal bridge' phenomenon, thereby enhancing energy efficiency.
2. Provides remarkable strength and outstanding toughness, combined with easy weldability and convenient construction, ensuring flawless integration into any project.
3. Features extraordinarily low thermal conductivity along with excellent waterproof and corrosion resistance properties, rendering it perfectly suited for direct burial in the ground or underwater applications, delivering versatility and dependability.
4. Facilitates effortless connection through flange or quick joint connections, streamlining the installation process and substantially reducing labor costs.
5. Promises an exceptional service life, performing reliably in harsh environments with temperatures ranging from -20ºC to 120ºC for over 30 years, ensuring long-term dependability and performance.
Discover a myriad of innovative connection methods designed to significantly boost the efficiency and reliability of your operations. Our advanced techniques ensure optimal performance, tailored to meet the unique demands of your underground piping solutions.
| Flange connection |
Flexible socket connection |
Experience a comprehensive welding joint demonstration, meticulously crafted to guarantee seamless integration and unparalleled performance. Our detailed approach ensures robust and enduring connections for your high thermal conductivity pre-insulated pipes.
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 pioneering leader in the engineering pipeline sector, we excel as a manufacturer, comprehensive service provider, and general contractor. Our core business focuses on four main categories of specialized and customized pipeline solutions: rainwater and sewage diversion, municipal, industrial and mining sectors, and crucial national engineering projects. By constructing a robust industrial ecosystem that integrates design institutes, financial bodies, port logistics, construction firms, and both upstream and downstream enterprises, Donghong Co., Ltd. is poised to revolutionize the global pipeline industry. Our mission is to lead with intelligent pipeline solutions that enhance 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 relentless innovation is driven 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, advancing the industry and setting new standards of excellence.
In November 2017, Donghong marked a historic milestone 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 equipment, facilitating the development of new 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 not only proudly carry CE, BV, ISO, and WAR certifications but have also surpassed all stipulated standards. Should you specify a national standard, we will either verify or rigorously test to ensure compliance, promising unparalleled quality and reliability.
2. What kinds of services do you offer?
As a versatile manufacturing factory, we provide an expansive range of pipe products, fittings, and comprehensive packaging and shipping solutions. As expert consultants, we deliver superior project consulting, cutting-edge pipe system solutions, and meticulous design recommendations. Furthermore, our engineering expertise shines in pipeline contracting, repair services, and complimentary maintenance guidance, ensuring all-encompassing support for your requirements.
3. Do you support OEM/ODM services?
Absolutely, we offer extensive customization options including materials, specifications, logos, packaging, and connection methods. Our expert team excels in delivering bespoke solutions tailored to your unique projects, evidenced by numerous successful cases that underscore our exceptional service.
4. What are your terms of payment?
We accept T/T (Telegraphic Transfer) or L/C (Letter of Credit) at sight, offering flexibility and convenience in our payment options.
5. How can you guarantee the quality of your goods?
We enthusiastically welcome all customers to visit our company and inspect our goods firsthand. We can perform stringent tests per your request before finalizing the order. Additionally, we offer pre-production samples for your testing and approval, ensuring our highest quality standards are met for your complete satisfaction.
){kind=link}