The outer protective layer of the HeatFlex Rigid Foam Lagging Cover is meticulously crafted using a high-strength, high-toughness polyethylene material. Utilizing the revolutionary polyethylene modification technology developed by Shandong Donghong Pipe Industry Co., Ltd., this layer undergoes a specialized surface polarization process. This process significantly enhances its adhesive compatibility with polyurethane, ensuring superior adhesion performance. The result is unmatched durability and efficiency in thermal insulation applications, making the HeatFlex Rigid Foam Lagging Cover the pinnacle of high-performance insulation 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. |
1. Working Steel Pipe: Expertly crafted from premium seamless steel pipe, spiral welded pipe, and straight seam welded pipe. Each pipe undergoes rigorous mechanical rust removal, ensuring a pristine surface quality that meets or exceeds the esteemed GB/T8923.1 Sa level 2.5 standard before thermal insulation is applied.
2. Slepipe: Innovatively engineered using a specially modified flame retardant and anti-static polyethylene resin, processed through a sophisticated single screw extrusion machine. This advanced design grants our pipes exceptional impact resistance, outstanding isolation capabilities, and formidable corrosion resistance.
3. Polyurethane Insulation Layer: Our state-of-the-art modified flame retardant polyurethane foam is injected under high pressure to perfectly fill the gap between the casing and the working steel pipe. This results in unmatched insulation performance, characterized by remarkably low thermal conductivity, superior compression strength, minimal water absorption, and an incredibly high closure rate.
1. Eliminates the need for additional support, significantly reduces heat loss, and completely eradicates the issue of 'support thermal bridge'.
2. Delivers high strength combined with excellent toughness, ensuring easy welding and convenient construction.
3. Boasts low thermal conductivity, along with robust waterproof and corrosion resistance properties, making it ideal for direct burial in ground or underwater environments.
4. Ensures seamless connections through flange or quick joint connections, simplifying the installation process.
5. Offers an impressive long service life, withstanding harsh conditions ranging from -20ºC to 120ºC for more than 30 years.
Various Connection Techniques
| Flange connection |
Flexible socket connection |
Welding Joint Exemplification
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. Our HeatFlex Rigid Foam Lagging Cover further enhances these benefits, delivering superior insulation and durability for long-lasting performance.
Shandong Donghong Pipe Industry Co., Ltd. (referred to as: Donghong Co., Ltd., stock code: 603856) is headquartered in Qufu, China, the esteemed hometown of Confucius. As a premier engineering pipeline manufacturer and a comprehensive service provider in the pipeline engineering sector, we also excel as a general contractor. Our core business portfolio includes four principal categories of specialized and customized pipeline solutions: pipelines for rainwater and sewage diversion, municipal areas, industrial and mining zones, and national key engineering projects. By cultivating an industrial ecosystem that seamlessly integrates design institutes, financial institutions, port logistics, construction units, and both upstream and downstream enterprises, Donghong Co., Ltd. is committed to revolutionizing the global pipeline industry. Our mission is to lead with intelligent pipelines that elevate human life and ensure the enduring safety of pipeline transportation.
Donghong prides itself on a robust team of over 200 R&D professionals and an impressive portfolio of more than 100 patents. Our innovation is driven by national technology platforms such as the enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. We are pioneering the research and development in the digitalization, informatization, and intelligentization of pipeline engineering, propelling the industry forward and setting unparalleled benchmarks of excellence.
In November 2017, Donghong achieved a significant milestone by being listed on the main board of Shanghai, marking a historic first for engineered composite piping systems in China.
Outstanding Technical Research and Development Capabilities
Our national CNAS laboratory is outfitted with state-of-the-art testing equipment that aids in the development of new products, materials, and connection types. This rigorous testing process ensures that our product quality remains consistently stable and reliable, upholding our steadfast commitment to excellence.
Donghong has established strategic partnerships with over five premier 5A-level logistics companies, drawing upon years of extensive transportation expertise. Leveraging a robust mix of road transport, railways, ports, and maritime logistics, we ensure seamless delivery regardless of weather conditions or geographical challenges. Be it scorching heat, freezing cold, or remote, rugged terrains, we guarantee unparalleled service. Our comprehensive transportation strategy is meticulously designed to ensure that every shipment reaches your site with remarkable speed and efficiency.
1. Does your product meet international standards?
Our products proudly meet and exceed international standards, having earned the prestigious CE, BV, ISO, and WAR certificates. Each parameter surpasses required benchmarks. Should you have a specific national standard in mind, simply let us know, and we will confirm or conduct tests to ensure compliance.
2. What kinds of services do you offer?
As a versatile manufacturing entity, we present an extensive suite of services including the production of various pipe products, fittings, packaging, and efficient shipping solutions. Our consultancy division delivers expert project consulting, pipe system solutions, and astute design recommendations. Furthermore, as an engineering-centric firm, we offer comprehensive pipeline contracting, meticulous repair services, and free maintenance guidance.
3. Do you support OEM/ODM services?
Absolutely. We provide extensive customization options in materials, specifications, logos, packaging, and connection methods. Our proficient team is adept at creating bespoke solutions tailored to your unique projects, and our track record of successful cases stands as a testament to our expertise in OEM/ODM services.
4. What are your terms of payment?
We accept payment via T/T or L/C at sight for your convenience.
5. How can you guarantee the quality of your goods?
We invite all prospective customers to visit our facilities for an in-person inspection of our products. Additionally, we can conduct rigorous pre-order testing and provide samples prior to bulk production for customer evaluation and assurance of quality.
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