Ductile iron pipes are mainly composed of magnesium, silicon, sulfur, phosphorus and other elements, which have the essence of iron and the properties of steel. In the crystallization process, on the basis of precise control of the chemical composition, magnesium, rare earth ferrosilicon alloy and mafic-silicon-chromium alloy are efficiently mixed in molten iron, and then quickly cooled and centrifuged by centrifugal ductile iron pipe machine. Below we will introduce the specifications and implementation standards of ductile iron pipes in detail.
1. Specifications of ductile iron pipes.
The specifications of ductile iron pipes usually refer to the outer diameter, inner diameter, wall thickness and other dimensions. According to different applications and pipe diameters, the standards and specifications of ductile iron pipes are also different. Here are some common ductile iron pipe specifications:
1.DN100-300mm: This is a common small and medium-diameter ductile iron pipe, which is mainly used in municipal water supply pipe network, residential area water supply, farmland irrigation and other occasions.
2.DN400-800mm: This is a large-diameter ductile iron pipe, which is mainly used in large-scale water conveyance projects, sewage treatment, rainwater drainage and other occasions.
3.DN900-2000mm: This is a super large diameter ductile iron pipe, which is mainly used for water conservancy projects, pumping stations and other large-scale water supply and drainage projects.
Second, the implementation standard of ductile iron pipe.
The production and inspection standards of ductile iron pipes are usually carried out in accordance with the national standard GB T 13295-2013 "Ductile Iron Pipes, Fittings and Accessories for Water and Gas". This standard stipulates the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage requirements of ductile iron pipes.
1.Classification: According to the different use occasions and requirements, ductile iron pipes are divided into ductile iron pipes for pressure flow and nodular cast iron pipes for pressure flow. Ductile iron pipes for pressure flow are mainly used for water supply and water transportation, and ductile iron pipes for non-pressure flow are mainly used for rainwater drainage and sewage discharge.
2.Technical requirements: ductile iron pipes should have sufficient strength, durability, corrosion resistance, etc., to meet the requirements of use. At the same time, pipes and fittings should meet the requirements of corresponding dimensional accuracy, internal and external surface quality, etc.
3.Test method: In order to ensure the quality and performance of ductile iron pipes, a series of tests and tests are required on raw materials, semi-finished products and finished products, including chemical composition analysis, mechanical property testing, internal and external surface testing, etc.
4.Inspection rules: During the production process and before the finished product leaves the factory, strict inspection should be carried out on raw materials, semi-finished products and finished products to ensure that the product quality meets the requirements. At the same time, unqualified products need to be reworked or scrapped.
5.Marking, packaging, transportation and storage: Ductile iron pipes should be identified before leaving the factory and packed in accordance with the corresponding packaging requirements. During transportation and storage, measures should be taken to prevent damage or contamination of the product.
In conclusion, understanding the specifications and implementation standards of ductile iron pipes is of great significance for the proper use and maintenance of ductile iron pipes. In actual use, appropriate ductile iron pipe specifications and implementation standards should be selected according to different use occasions and requirements to ensure that the quality and performance of the product meet the requirements.