Pre-Insulated Steel Pipe with Thermal Insulation Jacketing for Underground Piping

• 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, making it the prime choice for robust, long-lasting underground steam piping solutions. Experience the pinnacle of engineering excellence with our Pre-Insulated Steel Pipe with Thermal Insulation Jacketing for Underground Piping. Designed to withstand the most demanding conditions, our product guarantees exceptional thermal insulation, reliability, and longevity. The advanced surface polarization technique not only boosts adhesion but also fortifies the pipe against environmental stressors, ensuring seamless performance in various underground applications. Choose our pre-insulated steel pipe for a cutting-edge solution that stands the test of time.

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: Crafted with meticulous precision from premium seamless steel, spiral welded, and straight seam welded pipes, our offerings are subjected to rigorous mechanical rust removal to ensure they meet or exceed the stringent standards of GB/T8923.1 Sa level 2.5. This meticulous process guarantees unparalleled reliability and durability, positioning our pipes as the gold standard in the industry.
2. Slepipe: Expertly engineered using a unique blend of modified flame retardant and anti-static polyethylene resin, processed through cutting-edge single screw extrusion technology. This method produces pipes with outstanding impact resistance, superior isolation properties, and formidable corrosion resistance, making them ideal for the most challenging applications.
3. Polyurethane Insulation Layer: Our state-of-the-art modified flame retardant polyurethane foam is injected under high pressure to thoroughly fill the gap between the casing and the working steel pipe. This advanced technique yields exceptional insulation performance, characterized by very low thermal conductivity, high compression strength, minimal water absorption, and an impressive closure rate, ensuring optimal thermal efficiency.

1. Eliminates the need for additional support, significantly reducing heat loss and completely eradicating the 'support thermal bridge' phenomenon. This leads to greatly enhanced 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, along with robust waterproof and corrosion resistance properties. These characteristics make it ideal for direct burial in the ground or underwater applications, delivering unparalleled versatility and reliability.
4. Ensures straightforward connections through flange or quick joint methods, 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 amplify the efficiency and reliability of your operational processes. Our state-of-the-art solutions cater to a wide range of needs, providing unmatched durability and seamless functionality.

Flange connection

Flexible socket connection

Experience a comprehensive welding joint demonstration that ensures seamless integration and delivers robust, long-lasting performance. Witness how our expertly crafted joints can enhance the structural integrity and longevity of your installations.

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 headquartered in the culturally revered city of Qufu, China, the birthplace of Confucius. As a frontrunner in the engineering pipeline sector, we distinguish ourselves as a premier manufacturer, comprehensive service provider, and general contractor. Our expertise spans four pivotal categories of specialized and customized pipeline solutions: rainwater and sewage diversion, municipal services, industrial and mining sectors, and key national engineering projects. At Donghong Co., Ltd., we are dedicated to cultivating a dynamic industrial ecosystem that synergizes design institutes, financial institutions, port logistics, construction firms, and a network of upstream and downstream enterprises. With a visionary approach, we aim to revolutionize the global pipeline industry, leading with intelligent solutions that enhance the quality of life and ensure the enduring safety of pipeline transportation.

Donghong Co., Ltd. prides itself on a vibrant team of over 200 R&D experts and an impressive portfolio of over 100 patents. Our spirit of innovation is fueled by national technology platforms, including our enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. We are pioneers in digitalizing, informatizing, and intelligentizing pipeline engineering, setting new industry benchmarks and propelling the sector forward.
In November 2017, Donghong Co., Ltd. celebrated a historic achievement 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 national CNAS laboratory is equipped with the latest testing technologies, driving the innovation of new products, materials, and connection types. This rigorous testing ensures our products consistently maintain stability and reliability, showcasing our unwavering commitment 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 not only meet but surpass multiple international standards, including CE, BV, ISO, and WAR certifications. Simply specify the national standard you require, and we will verify or conduct tests to ensure full compliance. This guarantees unmatchable quality and dependability for every item.

2. What kinds of services do you offer?
As a leading manufacturer, we provide a vast range of pipe products, fittings, and packaging with seamless shipping solutions. Our consultancy services feature expert project consulting, innovative pipe system solutions, and meticulous design recommendations. Additionally, as an engineering-centric enterprise, we specialize in pipeline contracting, repair services, and offer free maintenance guidance, delivering comprehensive support tailored to your needs.

3. Do you support OEM/ODM services?
Absolutely! We offer extensive customization options in materials, specifications, logos, packaging, and connection methods. Our team excels in delivering bespoke solutions for your unique projects, backed by numerous successful cases that underscore our unparalleled service.

4. What are your terms of payment?
We accept T/T (Telegraphic Transfer) or L/C (Letter of Credit) at sight, ensuring flexible and convenient payment options to suit your needs.

5. How can you guarantee the quality of your goods?
We warmly invite all customers to visit our facilities and inspect our goods firsthand. We are capable of performing rigorous tests upon your request before placing an order. Additionally, we offer samples before bulk production for your testing and approval, ensuring that our products meet the highest quality standards for your complete satisfaction.