The outer protective layer of the CoolWrap PU Foam Filled Piping Solution 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. Experience a new era of insulation with unparalleled durability and 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 crafted from seamless steel pipe, spiral welded pipe, and straight seam welded pipe. Prior to the application of thermal insulation, our pipes undergo rigorous mechanical rust removal to achieve a superior quality standard not less than GB/T8923.1 Sa level 2.5.
2. Slepipe: Engineered with a unique blend of modified flame retardant and anti-static polyethylene resin, precision-processed by a single screw extrusion machine. This endows our pipes with exceptional impact resistance, outstanding isolation, and formidable corrosion resistance, ensuring long-term performance.
3. Polyurethane Insulation Layer: We employ advanced modified flame retardant polyurethane foam, injected under high pressure to meticulously fill the gap between the casing and the working steel pipe. This results in an unparalleled insulation effect, marked by exceptionally low thermal conductivity, high compression strength, minimal water absorption, and an elevated closure rate, ensuring optimal thermal performance.
1. Eliminates the necessity for support, significantly reduces heat loss, and completely eradicates the phenomenon of 'support thermal bridge,' enhancing overall system efficiency.
2. Provides remarkable strength and excellent toughness, coupled with easy welding and straightforward construction, streamlining the installation process.
3. Features remarkably low thermal conductivity along with robust waterproof and corrosion resistance, making it eminently suitable for direct burial in the ground or underwater applications, ensuring reliable performance in demanding environments.
4. Ensures seamless connection through flange or quick joint connections, facilitating hassle-free and efficient installation.
5. Boasts an impressive service life, thriving in environments ranging from -20ºC to 120ºC for over 30 years, providing long-term durability and reliability.
Explore Our Diverse Connection Methods
| Flange connection |
Flexible socket connection |
Welding Joint Demonstration
Insulation steel pipes are indispensable and play a crucial role in liquid and gas transmission pipe insulation projects across diverse sectors including 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 emerges as the premier choice for these applications, delivering exceptional thermal insulation performance. It offers unparalleled safety and reliability while significantly lowering construction costs, making it an unmatched solution in the industry.
Shandong Donghong Pipe Industry Co., Ltd. (referred to as: Donghong Co., Ltd., stock code: 603856) is headquartered in Qufu, China, the revered hometown of Confucius. We stand as a premier engineering pipeline manufacturer, comprehensive pipeline engineering service provider, and trusted general contractor. Our core business encompasses four primary categories of functional and customized pipeline solutions: specialized pipelines for rainwater and sewage diversion, municipal areas, industrial and mining zones, and national key engineering projects. By fostering an industrial ecosystem that integrates design institutes, financial institutions, port logistics, construction units, and both upstream and downstream enterprises, Donghong Co., Ltd. is dedicated to transforming the global pipeline landscape. Our mission is to lead with intelligent pipelines that enhance human life and ensure the perpetual safety of pipeline transportation.
Donghong boasts a formidable team of over 200 R&D professionals and holds an impressive portfolio of more than 100 patents. Our innovation is anchored 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 researching and advancing the digitalization, informatization, and intelligentization of pipeline engineering, steering the industry's evolution and setting new benchmarks of excellence.
In November 2017, Donghong reached a historic milestone by being listed on the main board of Shanghai, marking a historic first 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 pioneering products, advanced materials, and innovative connection types. This rigorous testing ensures our product quality remains consistently stable and reliable, maintaining our unwavering commitment to excellence.
Donghong has cultivated robust strategic alliances with over five elite 5A-level logistics companies, showcasing our extensive expertise in transportation. By seamlessly integrating automobile transport, railway systems, port handling, and shipping logistics, we ensure impeccable service regardless of extreme temperatures or challenging, remote locations. Our sophisticated transportation strategy guarantees that every shipment reaches the customer site promptly and efficiently.
1. Does your product meet international standards?
Our products have triumphantly cleared CE, BV, ISO, and WAR certifications, with all metrics surpassing the required standards. Should you have a specific national standard in mind, we can verify or rigorously test it to ensure full compliance.
2. What kinds of services do you offer?
As a leading manufacturing factory, we deliver an extensive array of pipe products, fittings, packaging, and shipping. Our consultancy services encompass expert project consulting, innovative pipe system solutions, and design recommendations. As an engineering-centric enterprise, we excel in pipeline contracting, meticulous repair services, and complimentary maintenance guidance.
3. Do you support OEM/ODM services?
Absolutely, we provide customized solutions in materials, specifications, logos, packaging, connection methods, and beyond. Our proficient team is adept at crafting bespoke solutions tailored to your unique projects, supported by numerous successful case studies that highlight our exceptional service.
4. What are your terms of payment?
We accommodate T/T or L/C at sight.
5. How can you guarantee the quality of your goods?
We cordially invite all customers to visit our company and personally inspect our goods. We can also perform rigorous testing per customer requests before finalizing orders. Furthermore, we offer sample dispatch before bulk production for thorough customer testing and approval.
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