INSULATION PIPE SYSTEM FOR MINE: Experience unparalleled efficiency and reliability with Shandong Donghong Pipe Industry Co., Ltd.'s cutting-edge high-temperature PPU pipes. Specifically engineered for underground applications, our tubes with pre-insulated pipe systems ensure optimal thermal insulation and robustness, making them the perfect choice for mining operations. Trust in the superior quality and advanced technology of our insulation pipe systems to enhance the performance and longevity of your infrastructure.
| Performance of outer guard pipe |
| Outer Diameter mm |
Minimum wall thickness mm |
Outer Diameter mm |
Minimum wall thickness mm |
| 90 |
3.0 |
365 |
7.2 |
| 110 |
3.0 |
400 |
7.8 |
| 125 |
3.0 |
420 |
8.0 |
| 140 |
3.0 |
450 |
8.8 |
| 160 |
3.0 |
500 |
9.8 |
| 180 |
3.5 |
550 |
10.8 |
| 200 |
3.9 |
560 |
11.0 |
| 225 |
4.4 |
600 |
11.7 |
| 250 |
4.9 |
630 |
12.3 |
| 280 |
5.4 |
655 |
12.8 |
| 315 |
5.4 |
710 |
13.5 |
| 325 |
6.4 |
760 |
13.9 |
| 335 |
6.6 |
850 |
15.7 |
| 355 |
7.0 |
955 |
17.6 |
Our system features an innovative stent-free foaming platform, eliminating the stent effect that causes significant heat loss. The outer sheath is crafted from a specialized, modified anti-static flame-retardant polyethylene material, formed through a single spiral extruder extrusion process. This ensures a seamless bond between the foamed insulation layer and the polyethylene layer, preventing any delamination of the insulation pipe. The DHPI mining thermal insulation pipe stands out with its superior impact resistance, excellent isolation properties, and remarkable corrosion resistance.
1. Working Steel Pipe: Expertly crafted from seamless steel pipe, spiral welded pipe, and straight seam welded pipe. Before insulation, our pipes undergo rigorous mechanical rust removal, achieving a quality standard of no less than GB/T8923.1 Sa level 2.5.
2. Slepipe: Meticulously engineered with specially modified flame-retardant and anti-static polyethylene resin, processed using a single screw extrusion machine. This grants our pipes exceptional impact resistance, outstanding isolation, and formidable corrosion resistance.
3. Polyurethane Insulation Layer: Our advanced technology injects modified flame-retardant polyurethane foam under high pressure to fill the gap between the casing and the working steel pipe. This creates an unparalleled insulation effect, characterized by minimal thermal conductivity, high compression strength, low water absorption, and an elevated closure rate.
1. Our system eliminates the need for support structures, significantly reducing heat loss, and completely eradicating the 'support thermal bridge' phenomenon.
2. Boasting high strength and superior toughness, our pipes are easily welded and allow for convenient construction.
3. With low thermal conductivity and robust waterproof and corrosion resistance, our pipes are ideal for direct burial in the ground or underwater applications.
4. Ensures effortless connection through flange or quick joint connections.
5. Designed for longevity, our pipes offer a long service life, withstanding harsh environments from -20ºC to 120ºC for over 30 years.
Varied Connection Methods: Discover the versatility and flexibility of our PPU pipes, designed to accommodate a wide range of connection methods. Whether you require mechanical joints, welding, or other specialized connections, our products ensure reliability and ease of installation.
| Flange connection |
Flexible socket connection |
Demonstration of Welding Joints: Witness the superior strength and seamless integration of our welded joints. Our demonstrations showcase the precision and durability of each connection, ensuring maximum performance and longevity in every 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.
Shandong Donghong Pipe Industry Co., Ltd. (referred to as: Donghong Co., Ltd., stock code: 603856), headquartered in the historic city of Qufu, China - the birthplace of Confucius, stands as a beacon in the engineering pipeline industry. As a premier manufacturer and comprehensive service provider, we excel as a trusted general contractor delivering specialized and customized pipeline solutions across four primary sectors: rainwater and sewage diversion, municipal applications, industrial and mining zones, and pivotal national engineering projects. By cultivating a synergistic industrial ecosystem that unites design institutes, financial institutions, port logistics, construction units, and both upstream and downstream enterprises, Donghong Co., Ltd. is reshaping the global pipeline industry. Our mission is crystal clear: to pioneer intelligent pipelines that elevate human living standards and ensure the unwavering safety of pipeline transportation.
Donghong is proud to have a formidable team of over 200 R&D professionals and an impressive portfolio of more than 100 patents. Our innovative edge is sharpened by national technology platforms, including the enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. Leading the charge in the digitalization, informatization, and intelligentization of pipeline engineering, we are redefining industry standards and spearheading advancements that set new benchmarks of excellence.
In a landmark achievement, November 2017 saw Donghong being listed on the main board of Shanghai, making history as the first engineered composite piping systems company in China to attain this distinction.
Outstanding Technical Research and Development Capabilities
Our state-of-the-art national CNAS laboratory is outfitted with cutting-edge testing equipment, empowering us to innovate and develop new products, materials, and connection types. This rigorous testing protocol ensures our products consistently meet the highest standards of stability and reliability, reflecting our steadfast commitment to excellence.
Donghong has established strategic partnerships with over five elite 5A-level logistics companies, backed by extensive years of transportation expertise. Whether by automobile, railway, port, or shipping logistics, our multifaceted approach ensures seamless service regardless of challenging weather or remote locations. Our robust transportation strategy guarantees prompt delivery of every shipment to your site, providing you with unparalleled service efficiency and reliability. Donghong Pipe Industry Co., Ltd. is dedicated to maintaining the highest standards of logistics, ensuring that our Underground PPU Pipe, Tube Insulation with High Density Foam Core reaches you in pristine condition, just as you expect.
1. Does your product meet international standards?
Our products proudly surpass international standards, having earned CE, BV, ISO, and WAR certifications. Each specification exceeds the necessary criteria. Specify your required national standard, and we will validate or test it to confirm compliance.
2. What kinds of services do you offer?
As a leading manufacturing factory, we provide a wide array of pipe products, fittings, comprehensive packaging, and efficient shipping solutions. Our consultancy services include expert project advice, customized pipe system solutions, and specialized design recommendations. Furthermore, as an engineering-focused enterprise, we excel in pipeline contracting, professional repair services, and offer complimentary maintenance guidance, ensuring seamless operations for your projects.
3. Do you support OEM/ODM services?
Absolutely. We offer extensive customization options, including materials, specifications, logos, packaging, and connection methods. Our proficient team delivers tailored solutions for unique project requirements, with numerous successful cases exemplifying our superior service.
4. What are your terms of payment?
We accommodate payments via T/T or L/C at sight for your convenience.
5. How can you guarantee the quality of your goods?
We enthusiastically invite all customers to visit our facility and witness our product quality firsthand. We also conduct rigorous tests as per customer requests before finalizing orders. Moreover, we can provide pre-production samples for customer testing to ensure complete satisfaction and qualification before bulk production.
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