Reinforced spiral welded steel pipe is a special pipe independently developed by our company for underground gas drainage in coal mine. Compared with traditional gas drainage steel pipe, this pipe has the advantages of light weight, high ring stiffness, corrosion resistance, etc., reducing the total construction cost of mining steel pipe. The product has been promoted and applied by the company for many years, and has been favored by customers and widely used. Mainly through structural design, the product improves the negative pressure resistance of the pipe and reduces the wall thickness of the steel pipe through the unique biting structural reinforcement.
The anti-corrosion structure of reinforced spiral welded steel pipe is divided into three types according to different needs of customers: fused epoxy powder coating, hot dip zinc and stainless steel. The maximum production capacity of the product can be DN1000mm, and the wall thickness can be 1.5-3.5mm according to the different product models.

The spiral welded steel pipe connection method is mainly flange connection, the product are mainly designed with flange socket, but adding bolts can connect the two ends firmly. 

Light Weight

Compared with the same specification of the steel pipe, the weight of the steel pipe saves 50% -150%,the pipe weight is light, reduce the construction labor intensity.

Corrosion preventive
Fused epoxy powder coating, hot dip zinc and stainless steel, diversified selection can ensure the service life of the pipe.

Negative pressure resistance
To meet the negative pressure performance requirements of the pipe for gas drainage, under-0.097MPa pressure, 100h pipe without suction, deformation.

Low operating noise
The inner wall of the pipe is a flat wall structure, with the inner wall smooth and low noise during normal operation.

Strong adhesion
The selection of anti-corrosion materials are the national standard mature technology type, the use of the process does not fall off, peeling phenomenon.

 About Us
Shandong Donghong Pipe Industry Co., Ltd. (referred to as: Donghong Co., Ltd., stock code: 603856) is headquartered in Qufu, China, the hometown of Confucius.Is an engineering pipeline manufacturer, pipeline engineering service provider and pipeline engineering general contractor with the main business of four categories of functional and customized pipelines: special pipelines for rainwater and sewage diversion, special pipelines for municipal areas, special pipelines for industrial and mining areas, and special pipelines for national key engineering projects. The company has built up an industrial ecosystem with the participation of design institutes, financial institutions,  port logistics, construction units, upstream and downstream enterprises, etc. The company is committed to becoming a global leading pipeline system comprehensive solution provider by making intelligent pipelines change human life and constant safety of pipeline transportation.

Donghong has more than 200 R&D personnel and more than 100 patents. Relying on national enterprise technology  center, national CNAS laboratory, academician expert workstation, post-doctoral workstation and other national technology R&D platforms, Donghong deepens the research on digitalization, informatization and intelligentization of pipeline engineering and leads the development of engineering pipeline industry. Relying on national technology research and development platforms such as National Enterprise Technology Center, National CNAS Laboratory,  Academician Expert Workstation, Post-doctoral Workstation, etc., Donghong deepens the research on the digitization, informatization and intelligence of pipeline engineering, leads the development of engineering pipeline industry, and serves the national key strategic projects and people's livelihood projects, such as South-to-North Water Diversion, Huangzhilin, Hanzhiwei, Beijing-New Zealand Expressway, One Belt, One Road,  standardized farmland, urban and rural water supply integration, Liren gas, centralized heat supply, etc. The company has been engaged in national key strategic projects and people's livelihood projects.

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.