The outer protective layer of the ThermalGuard PU Foam Insulated Steel Pipe 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 sophisticated 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. Experience the future of insulation with a product designed to exceed the highest industry standards and deliver exceptional performance under all conditions.
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 pipe, spiral welded pipe, and straight seam welded pipe. Our pipes undergo rigorous mechanical rust removal to ensure a pristine quality standard, meeting or exceeding GB/T8923.1 Sa level 2.5, before thermal insulation is applied.
2. Slepipe: Designed with a specially modified flame retardant and anti-static polyethylene resin, and processed by a high-performance single screw extrusion machine. This results in pipes with exceptional impact resistance, superior isolation properties, and formidable corrosion resistance.
3. Polyurethane Insulation Layer: We employ a high-pressure injection process to fill the gap between the casing and the working steel pipe with modified flame retardant polyurethane foam. This delivers an unbeatable insulation effect, featuring low thermal conductivity, high compression strength, minimal water absorption, and an elevated closure rate.
1. Our design eliminates the necessity for support structures, significantly reduces heat loss, and completely eradicates the phenomenon known as 'support thermal bridge.'
2. Our pipes offer high strength and excellent toughness, ensuring easy welding and convenient construction.
3. Featuring low thermal conductivity and robust waterproof and corrosion-resistant properties, our pipes are perfectly suited for direct burial in the ground or underwater.
4. Seamless installation is guaranteed with the option of flange or quick joint connections.
5. Enjoy a long service life with our pipes, enduring extreme environments ranging from -20ºC to 120ºC for over 30 years.
Exploring Various Connection Methods
Flange connection |
Flexible socket connection |
Detailed Welding Joint Demonstration
Insulated steel pipes are critical in liquid and gas transmission pipe insulation projects across a multitude of sectors. Whether in petroleum, chemical industries, central heating systems, heating networks, central air-conditioning ventilation pipes, or municipal engineering, our superior ThermalGuard PU Foam Insulated Steel Pipe excels. It is designed to deliver exceptional thermal insulation performance, ensuring unparalleled safety and reliability while significantly lowering construction costs. Distinguished as a high-temperature prefabricated direct-buried thermal insulation steel pipe, it is the premier choice for any demanding application.
Shandong Donghong Pipe Industry Co., Ltd. (referred to as: Donghong Co., Ltd., stock code: 603856) is headquartered in Qufu, China, the esteemed hometown of Confucius. As a top-tier engineering pipeline manufacturer, we provide comprehensive pipeline engineering services and serve as a trusted general contractor. Our core business is segmented into four principal categories of functional and bespoke 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 enterprises both upstream and downstream, Donghong Co., Ltd. is dedicated to revolutionizing the global pipeline landscape. Our mission is to lead with cutting-edge intelligent pipelines that enhance human life and secure the enduring safety of pipeline transportation.
Donghong boasts a distinguished team of over 200 R&D professionals and holds more than 100 patents. Our innovation is driven by national technology platforms including the enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. We are pioneering advancements in the digitalization, informatization, and intelligentization of pipeline engineering, steering the industry's evolution and setting new standards of excellence.
In November 2017, Donghong reached a monumental achievement by being listed on the main board of Shanghai, a historic first for engineered composite piping systems in China.
Outstanding Technical Research and Development Capabilities
Our state-of-the-art CNAS laboratory is equipped with the latest testing technology, enabling the development of innovative products, materials, and connection types. This rigorous testing guarantees our product quality remains consistently stable and reliable, upholding our unwavering commitment to excellence.
Donghong has established strategic partnerships with more than five premier 5A-level logistics companies, backed by years of unparalleled transportation experience. Whether by road, rail, or sea, we ensure seamless logistics solutions. Regardless of extreme temperatures or challenging, remote locations, we are committed to providing you with top-notch service. Our meticulously crafted transportation strategy guarantees that every shipment reaches your site as swiftly and efficiently as possible.
1. Does your product meet international standards?
Absolutely! Our products proudly carry CE, BV, ISO, and WAR certifications, each surpassing the mandated requirements. Specify any national standard you need, and we'll ensure it meets or even exceeds those benchmarks through our meticulous verification and testing processes.
2. What kinds of services do you offer?
At Shandong Donghong Pipe Industry Co., Ltd., we offer an array of exceptional services. As a premier manufacturing factory, we supply an extensive variety of pipe products, fittings, packaging, and logistics solutions. Our consultancy arm delivers expert project consulting, comprehensive pipe system solutions, and strategic design recommendations. Additionally, as an engineering powerhouse, we specialize in pipeline contracting, repair services, and provide free, expert maintenance guidance.
3. Do you support OEM/ODM services?
Indeed, we offer extensive OEM/ODM customization across materials, specifications, logos, packaging, and connection methods. Our seasoned team is adept at crafting tailor-made solutions for your unique projects, with myriad successful cases that exemplify our commitment to excellence.
4. What are your terms of payment?
We facilitate secure transactions through T/T or L/C at sight.
5. How can you guarantee the quality of your goods?
We invite you to visit our company and inspect our products firsthand to witness our commitment to quality. For added assurance, we can perform rigorous tests upon customer requests before finalizing any order. Furthermore, we offer sample dispatch services before bulk production, allowing customers to test and qualify our products independently.