Crafted with unparalleled precision, the outer protective layer of the Pre-Insulated Steel Pipe featuring an HDPE Jacket and advanced Polyurethane Foam for Thermal Insulation is meticulously designed using high-strength, high-toughness polyethylene material. Utilizing the cutting-edge polyethylene modification technology pioneered by Shandong Donghong Pipe Industry Co., Ltd., this protective layer is subjected to a specialized surface polarization process. This revolutionary technique substantially enhances its adhesive compatibility with polyurethane, ensuring exceptional adhesion performance. The end result is a product that delivers unmatched durability and extraordinary efficiency in thermal insulation applications. This makes it the ultimate choice for robust and long-lasting underground steam piping solutions.
| 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 the finest seamless steel, spiral welded, and straight seam welded pipes. Each pipe undergoes rigorous mechanical rust removal before thermal insulation, ensuring adherence to or surpassing the stringent GB/T8923.1 Sa level 2.5 standards. This meticulous process guarantees unmatched reliability and durability, establishing our pipes as the industry's gold standard.
2. SleePipe: Expertly engineered using a unique blend of modified flame retardant and anti-static polyethylene resin, processed with cutting-edge single screw extrusion technology. The result is pipes that boast exceptional impact resistance, superior isolation properties, and formidable corrosion resistance, making them perfect for the most demanding applications.
3. Polyurethane Insulation Layer: We employ advanced, modified flame retardant polyurethane foam, injected under high pressure to fill the gap between the casing and the working steel pipe. This process ensures an exceptional insulation effect, characterized by extremely low thermal conductivity, high compression strength, minimal water absorption, and an impressive closure rate, guaranteeing optimal thermal performance.
1. Eliminates the need for additional support, significantly reduces heat loss, and completely eradicates the 'support thermal bridge' phenomenon, greatly enhancing energy efficiency.
2. Offers remarkable strength and excellent toughness, coupled with ease of welding and convenient construction. This ensures seamless integration into any project, providing both efficiency and durability.
3. Exhibits exceptionally low thermal conductivity combined with robust waterproof and corrosion resistance properties. Ideal for direct burial in the ground or underwater applications, providing unparalleled versatility and reliability.
4. Ensures straightforward connection through flange or quick joint connections, simplifying the installation process and significantly reducing labor costs.
5. Boasts an impressive service life, enduring challenging environments with temperatures ranging from -20ºC to 120ºC for over 30 years, thus ensuring long-term performance and reliability.
Discover a diverse array of connection methods meticulously designed to amplify the efficiency and reliability of your operational processes, ensuring that every connection is robust, secure, and optimally functional.
| Flange connection |
Flexible socket connection |
Immerse yourself in an in-depth welding joint demonstration that guarantees seamless integration, offering unparalleled strength, durability, and long-lasting performance to meet all your technical requirements.
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. Specifically designed to excel in the most demanding conditions, these pipes ensure longevity and efficiency, making them an invaluable asset for industrial and municipal applications alike. By choosing our solution, you are making a wise investment in cutting-edge technology, superior engineering, and sustainable infrastructure. Opt for Shandong Donghong Pipe Industry Co., Ltd.'s Durable HVAC Condensate Pipes with Thermal Insulated Underground Piping System 1, and experience a new standard in pipeline excellence.
Shandong Donghong Pipe Industry Co., Ltd. (stock code: 603856), also known as Donghong Co., Ltd., operates proudly from Qufu, China-the historical birthplace of Confucius. As a vanguard in the engineering pipeline domain, we stand out as a premier manufacturer, an all-encompassing service provider, and a distinguished general contractor. Our expertise spans four vital segments of bespoke pipeline solutions: rainwater and sewage management, municipal services, industrial and mining applications, and significant national infrastructure projects. At Donghong Co., Ltd., we are dedicated to nurturing a vibrant industrial ecosystem that integrates design institutes, financial institutions, port logistics, construction firms, and an expansive network of upstream and downstream enterprises. Our visionary approach is set to revolutionize the global pipeline industry. Our mission is to spearhead intelligent pipeline solutions that elevate the quality of life and ensure the lasting safety of pipeline transportation.
Donghong Co., Ltd. takes pride in employing a dynamic team of over 200 R&D experts and boasts an impressive portfolio of more than 100 patents. Our innovation is fueled by national technology platforms, including our enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. We are at the forefront of digitalizing, informatizing, and intelligentizing pipeline engineering, propelling the industry forward and setting new benchmarks of excellence.
In November 2017, Donghong Co., Ltd. marked a significant milestone by becoming the first entity in China's engineered composite piping systems sector to be listed on the main board of Shanghai.
Outstanding Technical Research and Development Capabilities
Our cutting-edge national CNAS laboratory is equipped with the latest testing technologies, facilitating the innovation of new products, materials, and connection types. This rigorous testing guarantees that our products consistently maintain stability and reliability, underscoring our unwavering commitment to excellence.
Donghong has forged exclusive strategic alliances with over five premier 5A-level logistics companies, renowned for their extensive transportation expertise. By seamlessly integrating automobile, railway, port, and maritime logistics, we deliver exceptional service even in the most extreme temperatures and remote locations. Our comprehensive transportation network ensures that your order reaches its destination promptly, maintaining the pinnacle of efficiency and reliability. Our meticulous packaging and shipping processes protect the integrity and quality of our Pre-Insulated Steel Pipe with HDPE Jacket and Polyurethane Foam, ensuring they are primed for immediate installation upon arrival. Experience the ultimate in convenience and peace of mind with Donghong's unrivaled logistics solutions.
1. Does your product meet international standards?
Our products not only excel in passing CE, BV, ISO, and WAR certifications but also surpass all necessary standards. Let us know your required national standard, and we will verify or test it to ensure compliance, delivering unmatched quality and reliability.
2. What kinds of services do you offer?
As an industry leader, we offer a comprehensive array of services, including a full range of pipe products, fittings, and seamless shipping solutions. Our consultancy services provide expert project guidance, advanced pipe system solutions, and detailed design recommendations. Our engineering prowess ensures excellence in pipeline contracting, repair services, and complimentary maintenance guidance, guaranteeing extensive support for all your needs.
3. Do you support OEM/ODM services?
Absolutely! We offer extensive customization options in materials, specifications, logos, packaging, and connection methods. Our expert team thrives in delivering bespoke solutions tailored to your specific projects, demonstrated by numerous successful cases that showcase our exceptional service.
4. What are your terms of payment?
We accept T/T (Telegraphic Transfer) and L/C (Letter of Credit) at sight, offering you flexible and convenient payment options to suit your needs.
5. How can you guarantee the quality of your goods?
We warmly welcome all customers to visit our company and inspect our products firsthand. Additionally, we conduct rigorous tests upon your request before the order. We also offer sample testing before bulk production to ensure the highest quality standards are met, ensuring your complete satisfaction.
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