Pre-Insulated Steel Pipe Systems with HDPE Jacket and Polyurethane Foam 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
• 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. Leveraging Shandong Donghong Pipe Industry Co., Ltd.'s revolutionary polyethylene modification technology, this layer undergoes a sophisticated surface polarization process that significantly amplifies its adhesive compatibility with polyurethane. This groundbreaking approach ensures exceptional adhesion performance, providing unmatched durability and superior efficiency in thermal insulation applications. It stands as the ultimate 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 pipes are meticulously crafted from premium seamless steel, spiral welded, and straight seam welded pipes. Prior to thermal insulation, they undergo rigorous mechanical rust removal, meeting or exceeding the GB/T8923.1 Sa level 2.5 standard. This rigorous process guarantees exceptional reliability and durability, setting our pipes as the gold standard in the industry.
2. Slepipe: Engineered with a specialized blend of modified flame retardant and anti-static polyethylene resin, our Slepipe is processed using advanced single screw extrusion technology. This results in pipes boasting exceptional impact resistance, superior isolation properties, and formidable corrosion resistance, making them perfectly suited for the most demanding applications.
3. Polyurethane Insulation Layer: We utilize state-of-the-art, modified flame retardant polyurethane foam, injected under high pressure to fill the gap between the casing and the working steel pipe. This cutting-edge process ensures a superior insulation effect, characterized by 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, thereby 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, these pipes provide 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. This ensures long-term performance and reliability.

Connection Method

Uncover an extensive selection of connection methods, each meticulously crafted to elevate the efficiency and dependability of your operational systems.

Flange connection

Flexible socket connection

Witness an in-depth welding joint demonstration that guarantees flawless integration and provides strong, enduring 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), or Donghong Co., Ltd., proudly operates from the historically rich city of Qufu, China, the birthplace of Confucius. As a trailblazer in the engineering pipeline sector, we distinguish ourselves as a premier manufacturer, comprehensive service provider, and general contractor. Our expertise encompasses 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 dedicated to fostering a vibrant industrial ecosystem. This ecosystem 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. Our mission is to spearhead intelligent pipeline solutions that elevate the quality of life while ensuring the enduring safety of pipeline transportation.

Donghong Co., Ltd. is proud to feature a dynamic team of over 200 R&D experts and an impressive portfolio of over 100 patents. Our 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 cutting edge of digitalizing, informatizing, and intelligentizing pipeline engineering, propelling the industry forward and establishing 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 national CNAS laboratory is equipped with the latest testing technologies. This cutting-edge facility drives the innovation of new products, materials, and connection types. Rigorous testing guarantees that our products consistently maintain stability and reliability, embodying our unwavering commitment to excellence.

Certifications

Packaging & Shipping

Donghong has strategically aligned with over five elite 5A-level logistics companies, each boasting profound expertise in transportation. Through the innovative integration of automobile, railway, port, and shipping logistics, we deliver an unmatched service experience, capable of overcoming extreme temperatures and challenging locations. Our comprehensive transportation strategy ensures timely delivery directly to your site, maintaining the pinnacle of efficiency and reliability. Our meticulous packaging and shipping protocols protect the integrity and quality of our Pre-insulated Steel Pipe Systems with HDPE Jacket and Polyurethane Foam Insulation, ensuring they are ready for immediate installation upon arrival. This provides you with ultimate convenience and peace of mind.

FAQ

1. Does your product meet international standards?
Our products have successfully passed comprehensive certifications including CE, BV, ISO, and WAR, not merely meeting but exceeding all required standards. Specify your required national standard, and we'll either verify or rigorously test to ensure compliance, guaranteeing unparalleled quality and reliability.

2. What kinds of services do you offer?
As a manufacturing powerhouse, we offer a diverse array of pipe products, fittings, packaging, and seamless shipping solutions. Our consultancy services provide expert project advising, innovative pipe system solutions, and precise design recommendations. Moreover, as an engineering-centered enterprise, we excel in pipeline contracting, repair services, and offer free maintenance guidance, ensuring comprehensive support for all your requirements.

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 tailored solutions for your unique projects, supported 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, offering flexibility and convenience in our payment options.

5. How can you guarantee the quality of your goods?
We warmly welcome all customers to visit our company and inspect our goods firsthand. We can conduct rigorous tests upon request before the order. Additionally, we offer samples before bulk production for your testing and approval, ensuring the highest quality standards are consistently met for your satisfaction.