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. Shandong Donghong Pipe Industry Co., Ltd. presents an innovative Pre-insulated pipe with high-density foam for efficient underground thermal insulation. This masterpiece is engineered to deliver exceptional performance in maintaining thermal efficiency, reducing energy consumption, and ensuring long-lasting reliability for a variety of underground 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: 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 meticulous process guarantees unparalleled reliability and durability, making our steel pipes the backbone of any high-performance system.
2. Slepipe: Engineered with a proprietary blend of modified flame retardant and anti-static polyethylene resin, our Slepipe is processed using advanced single screw extrusion technology. This innovation bestows our pipes with exceptional impact resistance, superior isolation properties, and formidable corrosion resistance, making them the optimal choice for the most demanding applications.
3. Polyurethane Insulation Layer: Utilizing cutting-edge modified flame retardant polyurethane foam, injected under high pressure, we 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 unmatched thermal performance.
1. Eliminates the need for additional support, significantly reduces heat loss, and completely eradicates the 'support thermal bridge' phenomenon. This enhancement dramatically boosts energy efficiency, making our pre-insulated pipes a premier choice for sustainable solutions.
2. Offers remarkable strength and excellent toughness, paired with ease of welding and convenient construction. These characteristics ensure seamless integration into any project, streamlining installation and ensuring structural integrity.
3. Exhibits exceptionally low thermal conductivity along with robust waterproof and corrosion resistance properties. This makes our pipes ideally suited for direct burial in the ground or underwater applications, providing unmatched versatility and reliability.
4. Ensures straightforward connection through flange or quick joint connections, simplifying the installation process and reducing labor costs. Our design prioritizes ease of use without compromising on performance or durability.
5. Boasts an impressive service life, enduring in challenging environments with temperatures ranging from -20ºC to 120ºC for over 30 years. This guarantees long-term performance and reliability, cementing our pre-insulated pipes as the ultimate choice for enduring infrastructure.
Explore a variety of connection methods that enhance the efficiency and reliability of your operations.
| Flange connection |
Flexible socket connection |
Discover our comprehensive guide featuring detailed welding joint demonstrations, ensuring seamless integration and unparalleled robust performance for your projects.
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. Experience the pinnacle of innovation and reliability with Shandong Donghong Pipe Industry Co., Ltd., where each product is a testament to our commitment to quality and excellence.
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 leading name in the engineering pipeline sector, shining as a premier 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 forging a robust industrial ecosystem that integrates design institutes, financial bodies, port logistics, construction firms, and both upstream and downstream enterprises, Donghong Co., Ltd. aims at revolutionizing the global pipeline industry. Our mission is to lead the way with intelligent pipeline solutions that enrich the quality of life and ensure the enduring safety of pipeline transportation.
Donghong takes pride in its elite team of over 200 R&D experts and an impressive portfolio boasting more than 100 patents. Our innovation is driven by national technology platforms including the enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. We are trailblazing the digitalization, informatization, and intelligentization of pipeline engineering, propelling the industry forward and setting unparalleled standards of excellence.
In November 2017, Donghong marked a historic milestone by being listed on the main board of Shanghai, a groundbreaking 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, enabling us to develop innovative products, materials, and connection types. This rigorous testing ensures that our product quality is consistently stable and reliable, demonstrating our unwavering commitment to excellence.
At Shandong Donghong Pipe Industry Co., Ltd., we have forged robust strategic partnerships with over five elite 5A-level logistics companies, each renowned for their extensive expertise in transportation. By utilizing a sophisticated blend of automobile, railway, port, and shipping logistics, we deliver an unparalleled service that remains steadfast even under extreme temperatures or in challenging locations. Our meticulously planned and dynamic transportation strategy ensures timely and efficient delivery to your site, maintaining the highest standards of reliability and excellence.
1. Does your product meet international standards?
Our products have not only successfully passed CE, BV, ISO, and WAR certifications but have also exceeded all required standards. Specify the national standard you need, and we will either verify or test it to ensure compliance, guaranteeing the highest quality and reliability.
2. What kinds of services do you offer?
As a distinguished manufacturing factory, we provide an extensive range of premium pipe products, fittings, and comprehensive packaging and shipping solutions. Our consultancy arm offers expert project consulting, innovative pipe system solutions, and meticulously detailed design recommendations. As engineering specialists, we are proficient in pipeline contracting, repair services, and offer complimentary maintenance guidance, ensuring that every aspect of your needs is meticulously catered to.
3. Do you support OEM/ODM services?
Absolutely! We offer extensive customization options in materials, specifications, logos, packaging, and connection methods. Our expert team excels in delivering bespoke solutions tailored to your unique projects, backed by numerous successful cases showcasing 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 methods.
5. How can you guarantee the quality of your goods?
We warmly invite all customers to visit our company and personally inspect our goods. We can also conduct rigorous tests per your request before the order. Additionally, we offer sample products before bulk production for your testing and approval, ensuring the highest quality standards are met and your satisfaction is guaranteed.
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