Product Description:
Shandong Donghong Pipe Industry Co., Ltd. proudly presents our top-tier polyurethane-foam tubing, meticulously engineered to insulate central heating systems and domestic water pipelines. This exceptional tubing thrives in a vast temperature range of -50°C to 135°C, ensuring superior protection and minimizing heat transfer. Our product's robust and rigid construction promises unparalleled durability, safeguarding your pipes from potential harm. Moreover, its remarkable chemical resistance makes it adaptable for a multitude of applications.
Our state-of-the-art rigid polyurethane spray polyethylene-wrapped prefabricated direct-buried insulation pipe harnesses cutting-edge technology to optimize foam density uniformity and maintain consistent insulation layer thickness. This groundbreaking design not only conserves materials but also slashes labor costs, offering an economical solution for efficiently transporting hot water up to 140°C.
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. |
Key attributes such as thickness, density, thermal conductivity, closed cell rate, and water absorption are consistently uniform, ensuring remarkable overall stability.
With minimal axis eccentricity and low thermal conductivity, our product provides exceptional heat preservation performance.
The polyurethane online spraying process boasts high reactivity, excellent bonding with both the steel pipe and the outer protective layer. This ensures the insulation pipe remains unaffected by temperature fluctuations, and no delamination occurs.
The insulation layer features a smooth surface, minimal thickness deviation, and a broad adjustment range, meeting diverse requirements.
The outer protective layer utilizes a polyethylene winding method, resulting in thin, uniform walls, low shrinkage, minimal deformation and stress, and robust mechanical properties. This method effectively addresses the issue of cracking in the outer protective layer.
By reducing the thickness of the polyethylene outer protective layer, we lower costs and minimize deformation and stress under identical insulation conditions, allowing for a significant reduction in the thickness of the outer protective layer.
Shandong Donghong Pipe Industry Co., Ltd. proudly presents a groundbreaking pipe solution, designed with the following exceptional features:
1. No need for support structures, ensuring minimal heat loss and eliminating the problematic 'support thermal bridge' effect.
2. Boasting high strength, excellent toughness, effortless welding, and straightforward construction.
3. Exhibits low thermal conductivity, outstanding waterproofing, and robust corrosion resistance, ideal for direct burial in both soil and water.
4. Effortless connection through flange or quick joint, ensuring easy and rapid installation.
5. Built for durability with a service life exceeding 30 years, operating efficiently in environments ranging from -20ºC to 120ºC.
- Our products at Shandong Donghong Pipe Industry Co., Ltd. surpass international standards including CE, BV, ISO, and WARS certifications. We ensure superior quality, and upon request, we can verify compliance with any specified national standards.
- As a versatile manufacturing factory, we offer a comprehensive range of pipe products, fittings, packaging, and shipping services. In our role as a professional consultancy, we provide expert project advice, pipe system solutions, and design recommendations. Additionally, we offer pipeline contracting, repair services, and complimentary maintenance guidance as part of our engineering expertise.
- We support OEM/ODM services, customizing material, specifications, logos, packaging, connection methods, and more. Our team of professionals can tailor solutions for your unique projects, drawing on a wealth of successful case studies.
- Our payment terms include T/T or L/C at sight. We uphold the highest quality standards by inviting customers to visit and inspect our products. Rigorous testing is conducted as per customer requirements before order fulfillment, and we provide samples for independent testing prior to bulk production.
Classic Project Cases
Qingdao Haiyang 4.5 Million Square Meters Nuclear Energy Heating Project. This project stands as the inaugural nuclear energy heating project in China. It proudly utilizes Donghong's innovative spray-wound pre-direct buried thermal insulation pipe. These products are characterized by their uniform density and energy-saving properties, significantly enhancing the efficiency of heat transmission. An exemplary model of environmentally friendly construction products, it heralds a new era in sustainable development.
Qingdao West Coast Heating Pipeline Network Project.
Funded by the Qingdao West Coast Public Utilities Group, this 217 million yuan endeavor originates from the Qingdao Special Steel heating first station. The heating pipeline, stretching 8.2 kilometers along the east bank of the Henghe River and the north side of Binhai Avenue, connects at the Binhai Avenue and Hongkong Run Avenue Interchange to the Huaneng long-distance heating pipeline. This ambitious project actively incorporates industrial park waste heat, industrial waste heat, and clean energy for heating, utilizing Donghong's DN1400-DN1200 spray-wound pre-directly buried insulation pipes, and sets a new benchmark in energy conservation and consumption reduction.
Welcome to Shandong Donghong Pipe Industry Co., Ltd.
Shandong Donghong Pipe Industry Co., Ltd. (referred to as Donghong Co., Ltd., stock code: 603856) is a premier engineering pipeline manufacturer, proudly rooted in Qufu, China, the historic hometown of Confucius. We excel in designing and delivering bespoke pipelines tailored for a myriad of applications, including specialized pipelines for rainwater and sewage diversion, municipal infrastructure, industrial and mining sectors, as well as national key engineering projects.
Our company has cultivated a comprehensive industrial ecosystem that integrates design institutes, financial institutions, port logistics, construction units, and other pivotal stakeholders. We are unwavering in our mission to elevate human life through smart pipelines, ensuring unparalleled safety in pipeline transportation.
Shandong Donghong Pipe Industry Co., Ltd. is home to over 200 R&D experts and holds an impressive portfolio of more than 100 patents. By harnessing national technology R&D platforms such as the National Enterprise Technology Center, the National CNAS Laboratory, the Academician Expert Workstation, and the Post-doctoral Workstation, Donghong leads the charge in the digitalization, informatization, and intelligentization of pipeline engineering.
Our company stands at the helm of the engineering pipeline industry, making significant contributions to national key strategic projects and vital public welfare initiatives. Our notable contributions include the South-to-North Water Diversion, Huangzhilin, Hanzhiwei, Beijing-New Zealand Expressway, One Belt, One Road, 'Two Clear and One Tip', standardized farmland, urban and rural water supply integration, Liren gas, and centralized heat supply.
1. Does your product meet international standards?
Our products have passed CE, BV, ISO, and WARS certifications, all of which exceed standard requirements. Please inform us of the specific national standard you need, and we will verify or test it for you.
2. What types of services do you offer?
As a manufacturing factory, we provide high-quality pipe products, fittings, packaging, and shipping. As a professional consulting firm, we offer project consulting advice, pipe system solutions, and design suggestions. Furthermore, as an engineering-focused enterprise, we also provide pipeline contracting, pipe repair services, and complimentary maintenance guidance.
3. Do you support OEM/ODM services?
Yes, we specialize in customization of materials, specifications, logos, packaging, and connection methods. Our expert team can also offer tailored solutions for your specific projects, with numerous successful cases to our credit.
4. What are your terms of payment?
We accept T/T or L/C at sight.
5. How can you guarantee the quality of your goods?
We warmly welcome all customers to visit our company and inspect our products in person. We can also conduct rigorous tests as per your requirements before the order. Additionally, we can dispatch samples for you to perform your own tests to ensure product qualification before bulk production.