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.
| 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 from the finest seamless steel, spiral welded, and straight seam welded pipes. Prior to thermal insulation, these pipes undergo stringent mechanical rust removal, achieving a pristine standard that meets or exceeds GB/T8923.1 Sa level 2.5. This thorough process ensures unparalleled reliability and durability, setting a new benchmark in quality.
2. Slepipe: Engineered with a unique blend of modified flame retardant and anti-static polyethylene resin, processed through cutting-edge single screw extrusion technology. This advanced design imparts superior impact resistance, exceptional isolation properties, and robust corrosion resistance, making these pipes perfect for the most demanding applications.
3. Polyurethane Insulation Layer: Our state-of-the-art modified flame retardant polyurethane foam is injected under high pressure to fill the space between the casing and the working steel pipe. This innovative process ensures a superior insulation effect, featuring exceptionally low thermal conductivity, high compression strength, minimal water absorption, and an impressive closure rate, delivering optimal thermal performance.
1. Eliminates the necessity for additional support structures, significantly reducing heat loss and completely eradicating the 'support thermal bridge' phenomenon. This results in enhanced energy efficiency and cost savings.
2. Features remarkable strength and excellent toughness, combined with ease of welding and straightforward construction, ensuring seamless integration into any project with minimal effort.
3. Exhibits exceptionally low thermal conductivity coupled with robust waterproof and corrosion resistance properties. These characteristics make it ideally suited for direct burial in the ground or underwater applications, providing unparalleled versatility and reliability.
4. Facilitates straightforward connections through flange or quick joint connections, streamlining the installation process and significantly reducing labor costs.
5. Promises an impressive service life, demonstrating durability in challenging environments with temperatures ranging from -20ºC to 120ºC for over 30 years. This ensures long-term performance and reliability, making it a cost-effective solution for future projects.
Discover a diverse range of state-of-the-art connection methods meticulously designed to elevate the efficiency, security, and reliability of your operational framework. Each method is tailored to meet the highest industry standards, ensuring seamless connectivity and superior performance.
| Flange connection |
Flexible socket connection |
Experience comprehensive demonstrations of detailed welding joints, showcasing their seamless integration capabilities for unparalleled robustness and performance. Our welding techniques guarantee a flawless and enduring connection for all your industrial needs.
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 vanguard in the engineering pipeline sector, distinguished as a premier manufacturer, comprehensive service provider, and general contractor. Our specialization spans four pivotal categories of bespoke pipeline solutions: rainwater and sewage diversion, municipal, industrial and mining sectors, and critical national engineering projects. By forging a robust industrial ecosystem that integrates design institutes, financial bodies, port logistics, construction firms, and enterprises both upstream and downstream, Donghong Co., Ltd. is set on revolutionizing the global pipeline industry. Our mission is to lead the charge with intelligent pipeline solutions that elevate the quality of life and ensure the lasting safety of pipeline transportation.
Donghong takes immense pride in its team of over 200 R&D experts and an impressive suite of more than 100 patents. Our innovation is driven by national technological platforms including the enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. We are at the forefront of the digitalization, informatization, and intelligentization of pipeline engineering, propelling the industry forward and setting unprecedented standards of excellence.
In November 2017, Donghong marked a historic milestone by being listed on the main board of Shanghai, a pioneering 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 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. With our comprehensive and meticulously coordinated logistics network, we deliver not just products, but peace of mind by providing consistent, timely, and secure shipping solutions to meet all your project needs.
1. Does your product meet international standards?
Our products have surpassed CE, BV, ISO, and WAR certifications, not merely meeting but exceeding international standards. Specify the national standard you need, and we will verify or test to ensure compliance, guaranteeing premier quality and utmost reliability.
2. What kinds of services do you offer?
As a leading manufacturing factory, we offer an extensive array of pipe products, fittings, packaging, and shipping solutions. Additionally, our consultancy provides expert project consulting, innovative pipe system solutions, and precise design recommendations. As an engineering-focused enterprise, we excel in pipeline contracting, repair services, and complimentary maintenance guidance, delivering comprehensive support for all your requirements.
3. Do you support OEM/ODM services?
Absolutely, we offer extensive customization options in materials, specifications, logos, packaging, and connection methods. Our expert team is adept at providing tailored solutions for your unique projects, backed 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 warmly invite all customers to visit our company and inspect our goods firsthand. We are also capable of conducting rigorous tests as per your request before the order. Additionally, we can send samples prior to bulk production for your testing and approval, ensuring the highest quality standards are met for your satisfaction.
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