The outer protective layer of our High Temperature Mining Pipeline with Polyurethane Foam Filled Piping for Thermal Insulation 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 specialized surface polarization process. This advanced technique significantly enhances its adhesive compatibility with polyurethane, ensuring superior adhesion performance. The result is unmatched durability and exceptional efficiency in thermal insulation applications, setting a new standard in pipeline technology.
| 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 top-grade seamless steel pipe, spiral welded pipe, and straight seam welded pipe. Prior to thermal insulation, each pipe undergoes an extensive mechanical rust removal process to meet and exceed the stringent quality standard of GB/T8923.1 Sa level 2.5.
2. Slepipe: Designed using a specially formulated modified flame retardant and anti-static polyethylene resin, processed through a state-of-the-art single screw extrusion machine. This process endows our pipes with exceptional impact resistance, unparalleled isolation capabilities, and superior corrosion resistance.
3. Polyurethane Insulation Layer: We employ advanced modified flame retardant polyurethane foam, injected under high pressure to perfectly fill the gap between the casing and the working steel pipe. The result is a superior insulation layer marked by low thermal conductivity, high compression strength, minimal water absorption, and a remarkably high closure rate.
1. Effortlessly Eliminates the need for additional support, significantly reduces heat loss, and completely eradicates the occurrence of 'support thermal bridge.'
2. Provides exceptional strength and outstanding toughness, ensuring easy welding and straightforward construction.
3. Features low thermal conductivity combined with robust waterproof and corrosion resistance, making it ideally suited for direct burial in the ground or underwater applications.
4. Guarantees seamless connection through the use of flange or quick joint connections, ensuring a hassle-free installation process.
5. Delivers an impressive long service life, maintaining integrity and performance in environments ranging from -20ºC to 120ºC for over 30 years.
Various Connection Methods to Suit Your Needs
| Flange connection |
Flexible socket connection |
Detailed Welding Joint Demonstration for Precision and Durability
Insulation steel pipes play a pivotal role in the insulation projects for liquid and gas transmission across diverse sectors. This encompasses petroleum, chemical industries, central heating systems, heating networks, central air-conditioning ventilation pipes, and municipal engineering. Our High Temperature Mining Pipeline with Polyurethane Foam Filled Piping for Thermal Insulation emerges as the top-tier solution. It provides outstanding thermal insulation performance, unmatched safety, and reliability, all while significantly lowering construction costs. Choose our high-temperature prefabricated direct-buried thermal insulation steel pipe for excellence and efficiency in your projects.
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 take pride in being a premier engineering pipeline manufacturer, a comprehensive pipeline engineering service provider, and a trusted general contractor. Our core business thrives on 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 cultivating an industrial ecosystem that seamlessly integrates design institutes, financial institutions, port logistics, construction units, and both upstream and downstream enterprises, Donghong Co., Ltd. is committed to revolutionizing 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 dynamic 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 achieved a significant 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 state-of-the-art testing equipment, facilitating the development of new products, materials, and connection types. This rigorous testing ensures our product quality remains consistently stable and reliable, reinforcing our unwavering commitment to excellence.
Donghong has established strategic partnerships with more than five premier 5A-level logistics companies, bringing years of unparalleled transportation expertise to the table. Leveraging a multi-modal approach that includes automobile, railway, port, and shipping logistics, we deftly navigate any climatic condition or terrain-be it scorching heat, icy cold, or challenging, remote areas. Our sophisticated and comprehensive transportation strategy guarantees that every shipment reaches the customer site with utmost speed and efficiency, ensuring your satisfaction at every step of the way.
1. Does your product meet international standards?
Our products have triumphantly secured CE, BV, ISO, and WAR certifications, with all metrics surpassing the required benchmarks. If you need adherence to a specific national standard, simply let us know, and we'll ensure verification or conduct the necessary tests.
2. What kinds of services do you offer?
As a distinguished manufacturing facility, we deliver an extensive array of pipe products, fittings, packaging, and logistics solutions. In our capacity as consultants, we provide advanced project advice, comprehensive pipe system solutions, and top-tier design recommendations. Furthermore, as an engineering-centric enterprise, we excel in pipeline contracting, repair services, and offer complimentary maintenance guidance to ensure optimal system performance.
3. Do you support OEM/ODM services?
Absolutely, we specialize in customization across materials, specifications, logos, packaging, connection methods, and beyond. Our dedicated team is adept at crafting bespoke solutions tailored to your specific project needs, with numerous successful case studies highlighting our expertise and service excellence.
4. What are your terms of payment?
We accept T/T or L/C at sight, providing flexible options to suit your financial requirements.
5. How can you guarantee the quality of your goods?
We cordially invite all customers to visit our facility and personally inspect our products. Additionally, we can perform rigorous testing as per customer requests before the order is finalized. Moreover, we are willing to provide samples prior to mass production for thorough customer evaluation and approval.
Audited Supplier 
){kind=link}
){kind=link}