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. By integrating advanced material science and innovative engineering, our Mining Pipeline with Hot Water Pipe Cover delivers exceptional thermal insulation, allowing for optimal performance in the most demanding environments.
| 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 seamless steel, spiral welded, and straight seam welded pipes, each pipe is subjected to rigorous mechanical rust removal, ensuring adherence to quality standards no lower than GB/T8923.1 Sa level 2.5 before thermal insulation.
2. Slepipe: Engineered with a pioneering blend of modified flame retardant and anti-static polyethylene resin, our pipes, processed by a single screw extrusion machine, exhibit exceptional impact resistance, superior isolation properties, and remarkable corrosion resistance.
3. Polyurethane Insulation Layer: Utilizing advanced modified flame retardant polyurethane foam, we inject it under high pressure to fill the gap between the casing and the working steel pipe. This results in an outstanding insulation effect, characterized by low thermal conductivity, high compression strength, minimal water absorption, and a superior closure rate.
1. Eliminates the need for support structures, significantly reduces heat loss, and completely eradicates the 'support thermal bridge' phenomenon.
2. Demonstrates high strength and excellent toughness, facilitating easy welding and convenient construction processes.
3. Exhibits minimal thermal conductivity alongside robust waterproof and corrosion resistance properties, making it ideal for direct burial underground or underwater.
4. Guarantees seamless connection through flange or quick joint connections, ensuring practicality and ease of use.
5. Offers a remarkably long service life, enduring extreme environments ranging from -20ºC to 120ºC for an impressive span of over 30 years.
Various Cutting-Edge Connection Methods for Optimal Performance
| Flange connection |
Flexible socket connection |
Professional Welding Joint Demonstration to Ensure Maximum Durability and Reliability
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.
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 team of over 200 R&D professionals and holds 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 cutting-edge testing equipment, facilitating the development of new products, materials, and connection types. This rigorous testing ensures our product quality remains consistently stable and reliable, maintaining our unwavering commitment to excellence.
Donghong has meticulously established strategic alliances with over five premier 5A-level logistics companies, boasting extensive experience in transportation. Leveraging a multifaceted network that includes automobile transport, railway systems, port handling, and shipping logistics, we are committed to delivering unparalleled service regardless of weather conditions or geographical challenges. Our robust and comprehensive transportation strategy ensures that every shipment reaches our customers' sites promptly and efficiently, ensuring maximum satisfaction.
1. Does your product meet international standards?
Our products not only meet but exceed international standards, having successfully passed CE, BV, ISO, and WAR certifications. Each figure surpasses required benchmarks. Feel free to specify the national standard you need, and we will verify or test it accordingly to ensure compliance.
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 branch offers project consulting, pipe system solutions, and bespoke design recommendations. Furthermore, as an engineering-focused enterprise, we excel in pipeline contracting, repair services, and offer complimentary maintenance guidance.
3. Do you support OEM/ODM services?
Absolutely, we offer extensive customization in materials, specifications, logos, packaging, connection methods, and more. Our expert team specializes in providing tailored solutions for your specific projects, backed by numerous successful cases that showcase our exceptional service.
4. What are your terms of payment?
We accept T/T or L/C at sight, ensuring flexibility and security for all transactions.
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 conduct stringent tests upon customer request before order confirmation. Additionally, we offer sample dispatch before bulk production for thorough customer testing and qualification.
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