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 tube with pre-insulated pipe systems ensures 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
| Flange connection |
Flexible socket connection |
Demonstration of Welding Joints
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 are a premier engineering pipeline manufacturer, a comprehensive service provider in pipeline engineering, and a trusted general contractor. Our core business spans 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 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.
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.
Audited Supplier 
){kind=link}
){kind=link}