Steel Wire Mesh Skeleton Polyethylene Composite Pipe (SRTP/SRCP): Experience the pinnacle of modern mining technology with our revolutionary SRTP/SRCP pipes. Reinforced by high-strength steel wire mesh intricately helically twisted and molded on both sides, and enhanced with modified flame-retardant and antistatic high-density polyethylene (HDPE), this product offers unparalleled durability and performance. The high-performance adhesive resin seamlessly bonds the steel wire skeleton to the inner and outer layers of HDPE, amalgamating the robustness of steel with the versatility of plastic. Ideal for underground water supply and drainage, slurry spraying, gas extraction, and air pressure applications, our composite pipes are engineered to meet the rigorous demands of the mining industry.
Polyethylene Raw Materials: In the realm of coal mining, the inner and outer polyethylene resin layers are crafted from flame-retardant and antistatic specially modified materials, including carbon nanotube (CNT) modified substances and permanently colored special materials. These materials are developed using the company's unique intellectual property rights. Beyond complying with MT181 and MT558.1 standards, these advanced materials significantly enhance the mechanical properties of our pipes.
Enhanced Steel Wire: Our pipes utilize copper-plated steel wire conforming to GB/T14450 requirements, boasting a remarkable strength of 2050 MPa, far surpassing the standard 1850 MPa requirements. This ensures superior durability and reliability in demanding environments.
Adhesive Resin: Our patented adhesive resin, developed with the company's proprietary technology, offers exceptional adhesion to steel wire and outstanding process adaptability. This innovation ensures a robust bond and enhances the overall structural integrity of the composite pipes.
Pipe flanges
Pipe Flanges are the projecting edges, rims, ribs, or collars that join two pipes or a pipe to a fitting or piece of equipment. For situations when solvent cementing would not hold, such as during the dismantling of a piping system or during a temporary or mobile installation, or when two materials have to transition into one another, pipe flanges are utilized.
Flanges also have a high moment-carrying capability in comparison to other types of mechanical connections. This is a crucial quality for systems vulnerable to pipe-walking and lateral bending due to changes in temperature and pressure (e.g. deep water lines).
OD
dn/mm |
PN MPa |
| 0.8 |
1.0 |
1.25 |
1.6 |
2.0 |
2.5 |
3.5 |
| Nominal Wall Thickness / mm |
| 50 |
|
|
|
4.5 |
5.0 |
5.5 |
5.5 |
| 63 |
4.5 |
5.0 |
5.5 |
5.5 |
| 75 |
5.0 |
5.0 |
5.5 |
6.0 |
| 90 |
5.5 |
5.5 |
5.5 |
6.0 |
| 110 |
5.5 |
5.5 |
7.0 |
7.0 |
7.5 |
8.5 |
| 140 |
5.5 |
5.5 |
8.0 |
8.5 |
9.0 |
9.5 |
| 160 |
6.0 |
6.0 |
9.0 |
9.5 |
10.0 |
10.5 |
| 200 |
6.0 |
6.0 |
9.5 |
10.5 |
11.0 |
12.5 |
| 225 |
8.0 |
8.0 |
10.0 |
10.5 |
11.0 |
|
| 250 |
8.0 |
10.5 |
10.5 |
12.0 |
12.0 |
12.5 |
| 315 |
9.5 |
11.5 |
11.5 |
13.0 |
13.0 |
|
| 355 |
10.0 |
12.0 |
12.0 |
14.0 |
|
| 400 |
10.5 |
12.5 |
12.5 |
15.0 |
| 450 |
11.5 |
13.5 |
13.5 |
16.0 |
| 500 |
12.5 |
15.5 |
15.5 |
18.0 |
| 560 |
17.0 |
20.0 |
|
|
| 630 |
20.0 |
23.0 |
1. The pioneering enterprise to develop medium and high-pressure steel wire mesh skeleton polyethylene composite pipe products, complete with an innovative connection method.
2. The trailblazing enterprise to introduce the steel wire mesh skeleton polyethylene composite pipe specifically designed for underground coal mines.
3. The first enterprise to champion the use of wire mesh skeleton polyethylene composite pipes in the coal mining sector, establishing a new industry standard.
4. The first enterprise to innovate wire mesh skeleton polyethylene composite pipe products capable of withstanding pressures above 3.5MPa.
5. The pioneering enterprise to develop the 'double sealing' and 'one-piece clamp' connection technology tailored for steel wire mesh skeleton polyethylene composite pipes in underground coal mines.
The Flanged connection with port sealing end faces integral to the pipe, focusing on solving the needs of high pressurized piping applications.
Connection features:
1) Increased automation and high continuous production efficiency;
2) Short process flow, easy process control and reliable quality;
3) sealing end face and tube body integrated structure, no secondary injection molding, superior pressure-bearing capacity;
4) Riveting structure lengthening fixed end face, preventing system risk.
The Processing capacity:
Covering dn50-dn315mm models, 0.8MPa-10.0MPa pressure level connection capacity; dn355 and above models extend the original double seal structure.
The High pressure clamp connection With the help of special pipe end molding equipment, the end of the steel wire pipe "pier edge" to form a similar flange root-like structure, through the cast steel clamp to realize the connection between the pipe body;
Connection characteristics:
1) The joint is derived from the tube body, high structural strength;
2) Mechanical connection, quick and easy, without special equipment.
Processing capacity:
3) Simple and efficient connection, low technical requirements for personnel.
Processing capacity:
Covering dn90-dn315mm models, 1.6MPa-3.5MPa pressure level.
Mechanical Joints Advantages
1.There is zero structural or thermal change to the parts
2.Options galore for the raw stuff
3.Superior strength and endurance
4.Possibility of material movement after merging
5.Simple Quality Management
6.Environmentally responsible, emitting no pollutants
7.Mechanical Joints' Disadvantage
About
us
Donghong (Shandong Donghong Pipe Industry Co., Ltd.) (abbreviation: Donghong, stock code: 603856) proudly calls Qufu, the hometown of Confucius in China, its home. Established in 1997, Donghong stands as a premier manufacturer and service provider in the engineering pipeline sector. Our core business encompasses four major categories of functional and customized pipelines: rainwater and sewage drainage pipes, municipal pipelines, industrial and mining pipelines, and pipelines for national key projects. As a testament to our industry leadership, Donghong was listed on the main board of Shanghai on November 6, 2017, making history as China's first main board listed engineering composite pipeline manufacturer.
At Donghong, innovation is at our core. With over 200 R&D personnel and more than 100 patents, we leverage national enterprise technology centers, CNAS laboratories, academician expert workstations, and postdoctoral workstations to drive advancements in digitalization, informatization, and intelligence within the pipeline engineering realm. Our commitment to technological excellence positions us as trailblazers in the industry.
Committed to national strategic and livelihood projects, Donghong plays a vital role in major initiatives like the South-to-North Water Diversion, Hanjinwei, Beijing-Xinjiang Expressway, and the One Belt, One Road initiative. Our expertise extends to standardized farmland, urban and rural water supply integration, Liren gas projects, and centralized heating systems, reinforcing our position as leaders in engineering pipeline solutions for a brighter future.
Experimental Verification
Key Raw Materials
The binder resin is pivotal to our Composite HDPE Pipe with Steel Mesh. It ensures the seamless transfer of stress during the pipe pressure process and is a crucial composite material. The quality of our product is significantly influenced by the performance of the binder resin. At Shandong Donghong Pipe Industry Co., Ltd., we boast a specialized raw material design and development platform, precisely tailored to enhance the binder resin's capabilities, ensuring optimal compatibility with our processes and equipment.
Plating serves a dual purpose: it offers corrosion protection and boosts the shear strength between the steel wire and bonding resin. Through rigorous data testing and comparisons, it was discovered that the average shear strength of tin bronze reaches 20.69MPa, while brass is at 11.42MPa. Such variations in shear strength with different plating and bonding resins led us to opt for tin bronze-plated steel wire as our pressure-bearing substrate, ensuring superior performance and reliability.
Key Industrial and Mining Application Highlights
Xinjiang Key Project Construction: Process Pipeline for Potassium Salt in Lop Nur, Xinjiang
This pivotal national investment focuses on a salt chemical project in Xinjiang Lop Nur, featuring a highly demanding process pipeline. The annual conveying capacity, pipe bending resistance, and interface stability requirements are exceptionally rigorous. The expert technical team at Donghong meticulously designed and developed non-standard tailored product structures and interface solutions to meet these specific project conditions. Furthermore, Donghong Pipeline Engineering Company oversaw the entire construction process, ensuring optimal pipeline performance and operational efficiency.
Wet Copper Refining Project in Kazakhstan
This project required open-air transportation of highly corrosive copper sulfate media. Donghong's high-pressure corrosion-resistant SRTP, advanced composite500 steel-plastic technology, and innovative seal-seal double-seal connection technology provided an impeccable solution for the corrosion-resistant transport of these specialized media.
"One Belt, One Road"-Indonesia OBI Nickel and Cobalt Project Deep Sea Landfill Initiative
Situated on Obi Island in North Maluku Province, Indonesia, this project was designed by U.S. Borealis (Beijing) Pipeline Technology Co., Ltd. The deep-sea landfill (DSTP) system was chosen after a comprehensive analysis of economic investment, operational, and maintenance safety. The dn1000 * 1.6MPa steel wire mesh skeleton polyethylene composite pipe was ultimately selected, showcasing Donghong's innovation and expertise. The value of this project amounts to 66.484 million yuan.
Donghong has established strategic partnerships with more than 5 5A-level logistics companies, and we have many years of transportation experience. Combining automobile transportation, railway transportation, port and shipping logistics, etc., no matter the heat or cold, no matter the area is remote or harsh, we can provide you with the best service. We have a comprehensive transportation strategy to ensure that every shipment is delivered to the customer site as soon as possible.
1. Is your product meets the international standard ?
Our products have pass CE, BV, ISO and wars certificate, and all figures indicates higher than standard, you can feel free to let us know which national standard you required, we will check or test it for you.
2. What kind of service do you offer ?
As a manufacture fatory, we provide pipe products, pipe fittings, package and shipping; as a professional consulation company we provide project consulting advise, pipe system solutions and design suggestions; as an engineering focused enterprise , we also provide pipeline contractor service and pipe repair service, also can give free maintance guidance.
3. Do you support OEM/ODM service?
Yes, we offer customization in material, specification, logo, package , connection methods andothers. Meanwhile, our professional team can offer solution suggestion for your specified projects, we have successfull cases of that service.
4. What's your terms of payment?
T/T or L/C at sight.
5. How can you gurantee the goods you offered is qualified?
We warmly welcome all customers arrange the visit to our company and see our goods in sight, we can also provide strict test as per customer required before order. Meanwhile, before the bulk production, we can dispatch samples for customer to do their own tests to qualify the products.
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