Pre-Insulated Steel Pipe with Polyurethane Foam for Underground Thermal Insulation

• Customization: Available
• Application: Agricultural Irrigation, Chemical Transport, Industrial Processing, Oil and Gas Distribution, Wastewater Management, Water Supply, Base Oil, Derivatives, Industrial Lubricant
• certification: CE, ISO9001
• Model NO.: DH-The thermal insulation-BWGG
• Diameter: 400mm-1800mm
• Material: Carbon Steel
• Temperature Range: -20℃ to 80℃
• Filling Density: 60-90 Kg/M3
• Foam Core Density: 68.9 Kg/M3
• Thermal Conductivity: 0.029 W/(M.K)
• Radial Compressive Strength: 0.42 MPa
• Water Absorption: 5.9 %
• Obturator Ratio: 95%
• Shear Strength: 149-195 Kpa, 170ºC, 1450h
• Usage: Asphalt, Lubricants, Solvent, Fuel, Petroleum Coke
• Sheathing Tube: PE
• Main Insulation: Polyurethane Foam
• Working Tubes: Q235B, 355b, 20# Oryour Request
• Connection Method: Welding or Socket Type
• Temperature Classification: High Temperature Piping
• MPa Classfication: High Pressure Piping
• Standard: ASTM, API, CE
• Transport Package: Standard Package
• Specification: 6m, 12m or Upon your request
• Trademark: DHPI
• Origin: Shandong, China
• HS Code: 3917390000
• Production Capacity: 50000000 Tons /Year

Product Description

Product Description

The outer protective layer of our Pre-Insulated Steel Pipe with Polyurethane Foam 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 surface polarization process that significantly enhances its adhesive compatibility with polyurethane. This innovative approach ensures superior adhesion performance, offering unmatched durability and unparalleled efficiency in thermal insulation applications. Choose our advanced solution for robust, long-lasting underground steam piping needs.

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.

Our Advantages

1. Working Steel Pipe: Meticulously crafted from premium seamless steel pipe, spiral welded pipe, and straight seam welded pipe. Before thermal insulation, our pipes undergo rigorous mechanical rust removal to ensure a quality standard that meets or exceeds GB/T8923.1 Sa level 2.5. This guarantees unparalleled reliability and durability, making our pipes the gold standard in the industry.
2. Slepipe: Engineered with an exclusive blend of modified flame retardant and anti-static polyethylene resin, processed using state-of-the-art single screw extrusion technology. This results in pipes with exceptional impact resistance, superior isolation properties, and formidable corrosion resistance, perfectly suited for the most demanding applications.
3. Polyurethane Insulation Layer: We utilize cutting-edge, modified flame retardant polyurethane foam, injected under high pressure to fill the gap between the casing and the working steel pipe. This process ensures a superior insulation effect, characterized by exceptionally low thermal conductivity, high compression strength, minimal water absorption, and an impressive closure rate, guaranteeing optimal thermal performance.

1. Say goodbye to the need for additional support as our pre-insulated steel pipes significantly reduce heat loss and completely eradicate the 'support thermal bridge' phenomenon. This creates a highly energy-efficient system, perfect for achieving optimal thermal regulation.
2. Enjoy remarkable strength and excellent toughness with our pipes, designed for effortless welding and convenient construction. This enables seamless integration into any project, ensuring both efficiency and durability for long-term use.
3. Experience impressively low thermal conductivity combined with robust waterproof and corrosion resistance properties. Ideal for direct burial in the ground or underwater applications, our pipes offer unparalleled versatility and reliability in diverse environments.
4. Simplify the installation process with our pipes, which ensure straightforward connections through flange or quick joint options. This reduces labor costs significantly, making your project more cost-effective and efficient.
5. Rely on our pipes for an impressive service life, enduring challenging environments with temperatures ranging from -20ºC to 120ºC for over 30 years. This guarantees long-term performance and reliability, making them a worthwhile investment for any project.

Connection Method

Discover a diverse array of connection methods meticulously designed to amplify the efficiency and reliability of your operational processes.

Flange connection

Flexible socket connection

Experience a comprehensive welding joint demonstration that ensures seamless integration and delivers robust, long-lasting performance.

Appliation Cases

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.

Company Profile

Shandong Donghong Pipe Industry Co., Ltd. (stock code: 603856), also known as Donghong Co., Ltd., is proudly rooted in Qufu, China, the birthplace of Confucius. As a pioneering force in the engineering pipeline industry, we distinguish ourselves as a leading manufacturer, comprehensive service provider, and general contractor. Our expertise spans four crucial categories of specialized and custom pipeline solutions: rainwater and sewage systems, municipal services, industrial and mining sectors, and key national engineering projects. At Donghong Co., Ltd., we are devoted to creating a dynamic industrial ecosystem that seamlessly integrates design institutes, financial institutions, port logistics, construction firms, and a robust network of upstream and downstream enterprises. Our visionary approach aims to revolutionize the global pipeline industry with our intelligent solutions that not only enhance the quality of life but also ensure the enduring safety of pipeline transportation.

Donghong Co., Ltd. proudly encompasses a dynamic team of over 200 R&D experts and holds an impressive portfolio of over 100 patents. Our spirit of innovation is fueled by national technology platforms, including our state-of-the-art enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. We are leaders in digitalizing, informatizing, and intelligentizing pipeline engineering, pushing the industry forward and setting new standards of excellence.
In November 2017, Donghong Co., Ltd. achieved a monumental milestone by becoming the first company 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 outfitted with the latest testing technologies, facilitating the innovation of new products, materials, and connection types. This rigorous testing ensures that our products consistently maintain stability and reliability, reflecting our unwavering commitment to excellence.

Certifications

Packaging & Shipping

Donghong has forged strategic alliances with over five elite 5A-level logistics providers, each renowned for their exceptional transportation acumen. By seamlessly integrating automobile, railway, port, and shipping logistics, we deliver unmatched service, irrespective of extreme weather conditions or remote locations. Our comprehensive transportation strategy ensures punctual delivery to your site, upholding the highest standards of efficiency and dependability. Our meticulous packaging and shipping processes preserve the integrity and quality of our Pre-Insulated Steel Pipe with Polyurethane Foam for Underground Thermal Insulation, ensuring they are installation-ready upon arrival, thus offering you the ultimate in convenience and assurance.

FAQ

1. Does your product meet international standards?
Our products have not only successfully passed CE, BV, ISO, and WAR certifications but have also exceeded all required standards. Specify the national standard you need, and we will either verify or test it to ensure compliance, thus guaranteeing the highest quality and reliability.

2. What kinds of services do you offer?
As a manufacturing powerhouse, we offer an extensive range of pipe products, fittings, packaging, and seamless shipping solutions. In addition, our consultancy services provide expert project consulting, innovative pipe system solutions, and detailed design recommendations. Furthermore, as an engineering-focused enterprise, we excel in pipeline contracting, repair services, and free maintenance guidance, ensuring comprehensive support for all your requirements.

3. Do you support OEM/ODM services?
Absolutely, we offer extensive customization options in materials, specifications, logos, packaging, and connection methods. Our expert team is proficient in delivering tailored solutions for your unique projects, backed by numerous successful cases that highlight our exceptional service.

4. What are your terms of payment?
We accept T/T (Telegraphic Transfer) or L/C (Letter of Credit) at sight, providing flexibility and convenience in our payment options.

5. How can you guarantee the quality of your goods?
We warmly invite all customers to visit our company and inspect our goods firsthand. We are also capable of conducting rigorous tests as per your request before the order. Additionally, we can send samples before bulk production for your testing and approval, ensuring the highest quality standards are met for your satisfaction.