State-of-the-Art Insulation Pipe System for Mine Applications
| 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 innovative system adopts a stentless foaming platform, ingeniously addressing the significant issue of heat loss caused by the stent effect. The outer sheath is crafted from modified, professional-grade anti-static and flame-retardant polyethylene material, molded through a single spiral extruder. This meticulous process ensures that the foamed insulation layer and the polyethylene layer are seamlessly bonded, effectively preventing delamination. DHPI mining thermal insulation pipes are renowned for their exceptional impact resistance, isolation efficiency, corrosion resistance, and more.
1. Working Steel Pipe: Meticulously crafted from top-grade seamless steel pipe, spiral welded pipe, and straight seam welded pipe. Prior to applying thermal insulation, our pipes undergo a rigorous mechanical rust removal process, achieving a quality standard that meets or exceeds GB/T8923.1 Sa level 2.5.
2. Slepipe: Engineered with precision using specially modified flame retardant and anti-static polyethylene resin, processed through a state-of-the-art single screw extrusion machine. This bestows our pipes with extraordinary impact resistance, superior isolation capabilities, and exceptional corrosion resistance.
3. Polyurethane Insulation Layer: We deploy modified flame retardant polyurethane foam, injected under high pressure to fill the space between the casing and the working steel pipe. The result is an exemplary insulation effect, defined by ultra-low thermal conductivity, high compression strength, minimal water absorption, and an elevated closure rate.
1. Eliminates the requirement for support structures, significantly reduces heat loss, and completely eradicates the 'support thermal bridge' phenomenon.
2. Boasts high strength and outstanding toughness, facilitating easy welding and convenient construction processes.
3. Demonstrates exceptionally low thermal conductivity, along with robust waterproof and corrosion resistance, making it an ideal solution for direct burial in the ground or underwater.
4. Ensures straightforward and secure connections through either flange or quick joint methods.
5. Promises a long service life, withstanding challenging environments ranging from -20ºC to 120ºC for over 30 years.
Discover a Variety of Connection Methods
| Flange connection |
Flexible socket connection |
Comprehensive Welding Joint Demonstration
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 is a premier choice, offering exceptional thermal insulation performance, unmatched safety and reliability, and significantly reduced construction costs. It delivers superior efficiency and ensures long-term performance, making it the go-to solution for demanding applications.
Shandong Donghong Pipe Industry Co., Ltd. (referred to as: Donghong Co., Ltd., stock code: 603856) is headquartered in Qufu, China, the historic and culturally rich hometown of Confucius. As a leading engineering pipeline manufacturer, comprehensive pipeline engineering service provider, and esteemed general contractor, we excel in delivering specialized and customized pipeline solutions. Our core business spans four primary categories: advanced pipelines for rainwater and sewage diversion, essential municipal services, robust industrial and mining applications, and critical national engineering projects. At Donghong Co., Ltd., we have built an integrated industrial ecosystem that includes design institutes, financial institutions, port logistics, construction units, and a network of upstream and downstream enterprises. Our commitment is to revolutionize the global pipeline landscape with intelligent, high-performance pipelines that not only enhance human life but also ensure the enduring safety of pipeline transportation.
Donghong prides itself on a formidable team of over 200 R&D professionals and an impressive portfolio of more than 100 patents. Our dedication to innovation is supported by prestigious 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 setting new industry standards and driving the sector's evolution forward.
In November 2017, Donghong marked a monumental achievement by being listed on the main board of Shanghai, a historic first milestone for engineered composite piping systems in China.
Outstanding Technical Research and Development Capabilities
Our state-of-the-art national CNAS laboratory, outfitted with cutting-edge testing equipment, propels the development of innovative products, materials, and connection methods. This rigorous testing framework ensures that our product quality remains consistently exceptional and reliable, embodying our steadfast commitment to excellence.
At Donghong, we have forged strategic alliances with over five top-tier, 5A-rated logistics companies, underscoring our extensive expertise in transportation solutions. By integrating diverse methods such as automobile transport, railway logistics, and port shipping, we ensure seamless delivery regardless of extreme temperatures or challenging remote locations. Our robust and comprehensive transportation strategy guarantees that every shipment reaches your site promptly and efficiently, providing you with unparalleled service and reliability.
1. Does your product meet international standards?
Our products have triumphantly achieved CE, BV, ISO, and WAR certifications, with all metrics surpassing the required benchmarks. Should you need confirmation for a specific national standard, simply inform us, and we will verify or test it accordingly.
2. What kinds of services do you offer?
As a distinguished manufacturing factory, we provide an all-encompassing range of pipe products, fittings, packaging, and shipping solutions. From a consultancy perspective, we offer expert project consulting advice, bespoke pipe system solutions, and design recommendations. Embodying engineering excellence, we deliver pipeline contracting, repair services, and complimentary maintenance guidance.
3. Do you support OEM/ODM services?
Indeed, we offer extensive customization options in materials, specifications, logos, packaging, connection methods, and beyond. Our expert team is adept at delivering tailor-made solutions for your unique projects, with a proven track record demonstrated by numerous successful cases.
4. What are your terms of payment?
We accommodate T/T or L/C at sight.
5. How can you guarantee the quality of your goods?
We cordially invite all customers to visit our company for an in-depth inspection of our goods. Additionally, we can perform rigorous tests as requested by customers prior to placing an order. Moreover, we offer sample dispatch before commencing bulk production, ensuring customer testing and qualification.
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