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: Meticulously crafted from premium seamless steel pipe, spiral welded pipe, and straight seam welded pipe. Each pipe undergoes rigorous mechanical rust removal before thermal insulation, ensuring quality standards that meet or even exceed GB/T8923.1 Sa level 2.5. This meticulous process guarantees unparalleled reliability and durability, making our pipes a trusted choice for any industrial application.
2. Slepipe: Engineered with a proprietary blend of modified flame retardant and anti-static polyethylene resin, processed using advanced single screw extrusion technology. This innovative composition and manufacturing method grant our pipes exceptional impact resistance, superior isolation properties, and formidable corrosion resistance. They are ideally suited for the most demanding applications where resilience and reliability are paramount.
3. Polyurethane Insulation Layer: Employing cutting-edge, modified flame retardant polyurethane foam, injected under high pressure to fill the gap between the casing and the working steel pipe. This advanced technique creates a superior insulation effect, characterized by exceptionally low thermal conductivity, high compression strength, minimal water absorption, and an impressive closure rate. These attributes ensure optimal thermal performance, making our pipes an outstanding choice for efficient thermal management.
1. Eliminates the need for additional support, significantly reduces heat loss, and completely eradicates the 'support thermal bridge' phenomenon, thereby enhancing overall energy efficiency.
2. Offers remarkable strength and excellent toughness, while also being easy to weld and construct. This ensures seamless integration into any project, providing both strength and convenience.
3. Exhibits exceptionally low thermal conductivity, coupled with robust waterproof and corrosion resistance properties. These characteristics make our pipes ideally suited for direct burial in the ground or underwater applications, offering unparalleled versatility and reliability.
4. Ensures straightforward connection through flange or quick joint connections, simplifying the installation process significantly and reducing associated labor costs.
5. Boasts an impressive service life, enduring the harshest environments with temperatures ranging from -20ºC to 120ºC for over 30 years. This longevity ensures long-term performance and reliability, making our pipes a wise investment for sustainable infrastructure.
Explore a variety of connection methods that enhance the efficiency and reliability of your operations. Our innovative techniques ensure that Shandong Donghong Pipe Industry Co., Ltd. offers the most dependable solutions for your industrial pipe lagging needs.
| Flange connection |
Flexible socket connection |
Detailed welding joint demonstration for seamless integration and robust performance. Witness how our high-density pre-insulated pipes, crafted with premium polyurethane foam, deliver exceptional durability and efficiency for any industrial application.
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, the revered hometown of Confucius. As a leading luminary in the engineering pipeline sector, we distinguish ourselves as a premier manufacturer, comprehensive service provider, and general contractor. Our core business is meticulously segmented into four main categories of specialized and bespoke pipeline solutions: rainwater and sewage diversion, municipal utilities, industrial and mining sectors, and pivotal national engineering endeavors. By orchestrating 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 spearhead innovation with intelligent pipeline solutions that elevate the quality of life and ensure the enduring safety of pipeline transportation.
Donghong Co., Ltd. takes immense pride in our formidable team of over 200 R&D experts and a prestigious collection of more than 100 patents. Our innovation is propelled by national technology platforms, including the enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. We are at the forefront of digitalization, informatization, and intelligentization in pipeline engineering, driving industry advancement and setting new benchmarks of excellence.
In November 2017, Donghong Co., Ltd. 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 cutting-edge testing equipment, facilitating the development of new products, materials, and connection types. This rigorous testing framework ensures that our product quality remains consistently stable and reliable, epitomizing our unwavering commitment to excellence.
Donghong has forged robust strategic alliances with more than five premier 5A-level logistics enterprises, each demonstrating exceptional proficiency in transportation. Leveraging an innovative synergy of automotive, rail, port, and maritime logistics, we deliver unmatched service excellence, even in the face of extreme temperatures or demanding locales. Our comprehensive and resilient transportation strategy promises punctual delivery to your site, upholding the utmost levels of efficiency and dependability.
1. Does your product meet international standards?
Our products not only surpass CE, BV, ISO, and WAR certifications but also exceed all required standards. Specify the national standard you need, and we will ensure compliance through verification or testing, guaranteeing unparalleled quality and reliability.
2. What kinds of services do you offer?
As a leading manufacturing factory, we provide an extensive range of pipe products, fittings, packaging, and shipping solutions. Our consultancy arm offers expert project guidance, innovative pipe system solutions, and detailed design recommendations. Additionally, our engineering expertise ensures excellence in pipeline contracting, repair services, and free maintenance guidance, delivering comprehensive support for all your requirements.
3. Do you support OEM/ODM services?
Absolutely, we provide extensive customization options-including materials, specifications, logos, packaging, and connection methods. Our expert team excels in delivering tailored solutions for your unique projects, backed by numerous successful cases that showcase our exceptional services.
4. What are your terms of payment?
We offer flexibility and convenience in our payment options, accepting T/T (Telegraphic Transfer) or L/C (Letter of Credit) at sight.
5. How can you guarantee the quality of your goods?
We warmly invite you to visit our company and inspect our goods firsthand. We are capable of conducting rigorous tests upon your request before the order. Additionally, we can provide samples before bulk production for your testing and approval, ensuring the highest quality standards are consistently met for your satisfaction.
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