Pre-Insulated Steel Pipe with Polyurethane Foam Core and Industrial Lagging Solution

• 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 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. It stands as the prime choice for robust, enduring underground steam piping solutions, providing reliability and excellence in performance.

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. 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, combined 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 along 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, thereby ensuring long-term performance and reliability.

Connection Method

Discover a diverse array of connection methods meticulously designed to enhance the efficiency and reliability of your operational processes, ensuring optimal performance and seamless integration.

Flange connection

Flexible socket connection

Experience a comprehensive welding joint demonstration that guarantees seamless integration and delivers robust, long-lasting performance for all your industrial needs.

Appliation Cases

Insulation steel pipes play a crucial role in the insulation of liquid and gas transmission pipelines across a wide array of sectors. These include petroleum, chemical industries, central heating systems, heating networks, central air-conditioning ventilation pipes, and municipal engineering projects. Our high-temperature prefabricated direct-buried thermal insulation steel pipe distinguishes itself as an elite choice, delivering extraordinary thermal insulation capabilities, unmatched safety and reliability, and significantly minimized construction costs. Engineered to perform in the most rigorous conditions, these pipes ensure durability and efficiency, providing immense value for industrial and municipal applications. Opting for our solution signifies a wise investment in advanced technology, exceptional engineering, and sustainable infrastructure.

Company Profile

Shandong Donghong Pipe Industry Co., Ltd. (stock code: 603856), also known as Donghong Co., Ltd., proudly calls the historically significant city of Qufu, China—Confucius's birthplace—its home. As a trailblazer in the engineering pipeline sector, we are distinguished as a premier manufacturer, comprehensive service provider, and general contractor. Our expertise spans four pivotal categories of specialized and tailored pipeline solutions: rainwater and sewage diversion, municipal services, industrial and mining sectors, and key national engineering projects. At Donghong Co., Ltd., we are committed to fostering a dynamic industrial ecosystem that integrates design institutes, financial institutions, port logistics, construction firms, and a network of upstream and downstream enterprises. Our visionary approach aims to revolutionize the global pipeline industry with intelligent solutions that elevate the quality of life and ensure the enduring safety of pipeline transportation.

Donghong Co., Ltd. is powered by a dynamic team of over 200 R&D experts and boasts an impressive portfolio of over 100 patents. Our spirit of innovation is driven 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. 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 state-of-the-art CNAS laboratory is equipped with the latest testing technologies, enabling the development 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 elite strategic alliances with over five top-tier 5A-level logistics companies, renowned for their exceptional transportation expertise. By leveraging an integrated logistics network encompassing automobile, railway, port, and maritime solutions, we deliver unmatched service excellence, no matter the temperature extremes or challenging locations. Our comprehensive transportation strategy ensures prompt and reliable delivery to your site, adhering to the highest standards of efficiency and dependability. Through our diligent packaging and shipping protocols, we preserve the pristine condition and superior quality of our Pre-Insulated Steel Pipes with Polyurethane Foam Core and Industrial Lagging Solution. They are meticulously prepared for immediate installation upon arrival, offering you unparalleled convenience and peace of mind.

FAQ

1. Does your product meet international standards?
Our products not only meet but surpass international standards, having triumphantly passed CE, BV, ISO, and WAR certifications. Should you have a specific national standard in mind, we will either verify or test to ensure full compliance, thereby guaranteeing unparalleled quality and reliability.

2. What kinds of services do you offer?
As a manufacturing powerhouse, we offer a comprehensive array of pipe products, fittings, packaging, and seamless shipping solutions. Our consultancy services deliver expert project consulting, innovative pipe system solutions, and detailed design recommendations. As an engineering-centric enterprise, we specialize in pipeline contracting, repair services, and free maintenance guidance, ensuring robust support tailored to your every requirement.

3. Do you support OEM/ODM services?
Absolutely, we provide extensive customization options in materials, specifications, logos, packaging, and connection methods. Our expert team excels in delivering bespoke solutions for your unique projects, with numerous successful cases highlighting our superior service.

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

5. How can you guarantee the quality of your goods?
We cordially invite all customers to visit our company and inspect our goods firsthand. We are fully equipped to conduct rigorous tests as per your request before placing an order. Additionally, we can send samples prior to bulk production for your testing and approval, ensuring the highest quality standards are upheld for your utmost satisfaction.