The outer protective layer of the InsulFlex Hot Water Pipe Covering 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, providing unmatched durability and efficiency in thermal insulation applications. Experience the zenith of engineering excellence with our InsulFlex Hot Water Pipe Covering, designed to exceed your expectations in every way.
| 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: Meticulously crafted from seamless steel pipe, spiral welded pipe, and straight seam welded pipe. Each pipe undergoes a rigorous mechanical rust removal process prior to thermal insulation, ensuring it meets a quality standard no lower than GB/T8923.1 Sa level 2.5.
2. Slepipe: Engineered with a specially modified flame retardant and anti-static polyethylene resin, processed through a state-of-the-art single screw extrusion machine. This bestows our pipes with exceptional impact resistance, superior isolation capabilities, and formidable corrosion resistance.
3. Polyurethane Insulation Layer: We employ modified flame retardant polyurethane foam injected under high pressure to fill the gap between the casing and the working steel pipe. This results in an unmatched insulation effect, characterized by low thermal conductivity, high compression strength, minimal water absorption, and an elevated closure rate.
1. Eliminates the need for support, significantly reduces heat loss, and completely eradicates the 'support thermal bridge' phenomenon.
2. Offers remarkable strength and exceptional toughness, facilitating easy welding and convenient construction.
3. Exhibits impressively low thermal conductivity along with robust waterproof and corrosion resistance, making it perfectly suitable for direct burial in the ground or underwater.
4. Ensures seamless connections through flange or quick joint mechanisms.
5. Boasts an extraordinarily long service life, capable of enduring extreme environments from -20ºC to 120ºC for over 30 years.
Discover Various Connection Methods
| Flange connection |
Flexible socket connection |
Detailed Welding Joint Demonstration
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.
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 vanguard in the engineering pipeline industry, we are a leading manufacturer, provider of comprehensive pipeline engineering services, and a reliable general contractor. Our expertise spans four pivotal categories of functional and tailor-made pipeline solutions: specialized pipelines for rainwater and sewage diversion, urban municipal areas, industrial and mining zones, and national key engineering projects. By nurturing an all-encompassing industrial ecosystem that amalgamates design institutes, financial institutions, port logistics, construction units, and both upstream and downstream enterprises, Donghong Co., Ltd. is dedicated to revolutionizing the global pipeline industry. Our mission is to spearhead the creation of intelligent pipelines that elevate human life and guarantee the perpetual safety of pipeline transportation.
Donghong boasts an elite team of over 200 R&D professionals and proudly holds more than 100 patents. Our innovative prowess is fortified by national technology platforms such as the enterprise technology center, CNAS laboratory, academician expert workstation, and post-doctoral workstation. We are pioneers in the research and advancement of digitalization, informatization, and intelligentization of pipeline engineering, driving the industry's progress and setting new standards of excellence.
In November 2017, Donghong celebrated 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 state-of-the-art national CNAS laboratory is outfitted with cutting-edge testing equipment, facilitating the development of innovative products, materials, and connection types. This rigorous testing ensures our product quality remains consistently stable and reliable, reflecting our unwavering commitment to excellence.
Donghong has established strategic partnerships with over five top-tier, 5A-level logistics companies, backed by extensive years of transportation expertise. Our multifaceted logistics strategy seamlessly integrates automobile transportation, railway networks, ports, and shipping logistics. Whether you're facing extreme heat, biting cold, or are located in the most remote and challenging areas, we are committed to delivering unparalleled service. Our robust transportation strategy is meticulously designed to ensure every shipment reaches your site with utmost speed and efficiency.
1. Does your product meet international standards?
Our products have proudly earned CE, BV, ISO, and WAR certifications, surpassing all required standards. Specify any national standards you need, and we will ensure compliance through verification or testing.
2. What kinds of services do you offer?
As a premier manufacturing factory, we offer a vast array of pipe products, fittings, packaging, and shipping services. As a consultancy, we deliver expert project consulting, bespoke pipe system solutions, and design advice. Additionally, as an engineering specialist, we provide pipeline contracting, repair services, and complimentary maintenance guidance to meet all your needs.
3. Do you support OEM/ODM services?
Absolutely, we specialize in customization across materials, specifications, logos, packaging, connection methods, and more. Our expert team offers tailored solutions for your unique projects, backed by numerous successful case studies demonstrating our exceptional service.
4. What are your terms of payment?
We gladly accept T/T or L/C at sight payment methods.
5. How can you guarantee the quality of your goods?
We warmly invite all customers to visit our company and inspect our goods firsthand. Additionally, we can perform rigorous tests upon customer request before finalizing any order. For added assurance, we offer sample dispatch before bulk production for customer evaluation and approval.
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