Pre-Insulated Steel Pipe with Thermal Insulation Jacketing and Polyurethane Foam

• 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
• Connection Type: Welding/Socket
• 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 Thermal Insulation Jacketing and 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 state-of-the-art surface polarization process. This advanced enhancement significantly boosts its adhesive compatibility with polyurethane, ensuring superior adhesion performance. The result is unmatched durability and unparalleled efficiency in thermal insulation applications, making this product the prime choice for robust, 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.

Our Advantages

1. Working Steel Pipe: Our steel pipes are meticulously crafted from premium seamless steel, spiral welded, and straight seam welded pipes. Prior to thermal insulation, each pipe undergoes a rigorous mechanical rust removal process to meet or exceed the stringent GB/T8923.1 Sa level 2.5 standard. This dedication to quality ensures unparalleled reliability and durability, positioning our pipes as the gold standard in the industry.
2. Slepipe: Engineered with a distinctive blend of modified flame retardant and anti-static polyethylene resin, our Slepipe is processed using cutting-edge single screw extrusion technology. The result is a pipe with extraordinary impact resistance, superior isolation properties, and formidable corrosion resistance—perfectly suited 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 remarkably low thermal conductivity, high compression strength, minimal water absorption, and an impressive closure rate, guaranteeing optimal thermal performance.

1. Our design eliminates the need for additional support, significantly reduces heat loss, and completely eradicates the 'support thermal bridge' phenomenon, thereby greatly enhancing energy efficiency.
2. The product offers remarkable strength and excellent toughness, combined with ease of welding and convenient construction. This ensures seamless integration into any project, delivering both efficiency and durability.
3. With exceptionally low thermal conductivity, robust waterproof, and corrosion resistance properties, this product is ideal for direct burial in the ground or underwater applications, providing unparalleled versatility and reliability.
4. Our design ensures straightforward connection through flange or quick joint connections, simplifying the installation process and significantly reducing labor costs.
5. The product boasts an impressive service life, enduring challenging environments with temperatures ranging from -20ºC to 120ºC for over 30 years, ensuring long-term performance and reliability.

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), widely recognized as Donghong Co., Ltd., proudly operates from the culturally rich city of Qufu, China, the revered birthplace of Confucius. As a trailblazer in the engineering pipeline industry, we have established ourselves as a premier manufacturer, comprehensive service provider, and esteemed general contractor. Our expertise is deeply rooted in four pivotal categories of specialized and bespoke pipeline solutions: rainwater and sewage diversion, municipal services, industrial and mining sectors, and critical national engineering projects. At Donghong Co., Ltd., we are unwavering in our commitment to forging a thriving industrial ecosystem. This ecosystem seamlessly integrates design institutes, financial institutions, port logistics, construction firms, and a vast array of upstream and downstream enterprises. Our visionary approach is dedicated to revolutionizing the global pipeline industry. Our mission is to lead with intelligent pipeline solutions, elevating the quality of life while ensuring the enduring safety and reliability of pipeline transportation.

Donghong Co., Ltd. boasts a dynamic team of over 200 R&D experts and holds an impressive collection of over 100 patents. Our spirit of innovation is powered by advanced 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. This pioneering approach propels the industry forward and establishes new benchmarks of excellence.
In a landmark achievement in November 2017, Donghong Co., Ltd. became the first company in China's engineered composite piping systems sector to be listed on the main board of Shanghai. This milestone underscores our leadership and commitment to excellence in the industry.

Outstanding Technical Research and Development Capabilities
Our cutting-edge national CNAS laboratory is equipped with state-of-the-art testing technologies. This advanced facility drives the innovation of new products, materials, and connection types. Our rigorous testing protocols ensure that our products maintain consistent stability and reliability, underscoring our unwavering dedication to excellence.

Certifications

Packaging & Shipping

Donghong has established strategic partnerships with over five elite 5A-level logistics companies, boasting extensive expertise in transportation. Utilizing a dynamic blend of automobile, railway, port, and shipping logistics, we ensure unparalleled service, regardless of extreme temperatures or challenging locations. Our robust transportation strategy guarantees timely delivery to your site, maintaining the highest standards of efficiency and reliability. With a meticulous approach to packaging and shipping, we safeguard the integrity and quality of our Pre-insulated pipes, making them ready for immediate installation upon arrival, providing you with the ultimate convenience and peace of mind.

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.