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      •  Steel-plastic composite pipe:

        It‘s the galvanized steel pipe that is lined plastic or coated with high-adhesive, anti-corrosive,food-grade and sterile HDPE powdered plastic,paint or epoxy resin paint on its inner wall, which is also called PE pipe in short.Each pipe is 6 meters in length.

        Classification:

        Based on the technology combining the plastic and the substrate, the steel-plastic composite pipes can be classified into plastic-lined steel pipes and plastic-coated pipes.
        Based on pressure-bearing grade,the steel-plastic composite pipes can be classified into common pipes and reinforced pipes.
        Based on the purposes,the steel-plastic composite pipes can be classified into cold water composite pipe, hot water composite pipe, gas composite pipe and special fluid composite pipe.
        Application: It is used to supply running water and has strong stress tolerance. It is often applied to cold and hot water pipelines in the water-supply system of urban construction and buildings, gas,coal gas delivery pipes, liquid petroleum, chemicals, food and medicine delivery pipes, agriculture irrigation and drainage, water supply pipelines, water supply pipes in the industrial paper-making and firefighting system;the hot water plastic-lined pipes can also be applied for transportation of solar hot water.
         
         
            

      • Welded steel pipe:

        It is called welded pipe in short and manufactured by welding bending-formed steel plate or strip.It is the predecessor of galvanized pipe and made of Q235B. Based on the type of welding, the welded steel pipes can be classified into longitudinal welded pipe and spiral welded pipe.Each pipe is 6 meters in length.

        Application:Generally the welded pipes are used to deliver low-pressure liquid and used as the pillars of some building structures; it shall not be used in water delivery pipes and other delivery pipes which may cause corrosion. 

         
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          最近2018中文字幕2019电影,亚洲 小说 欧美 激情 另类,国内精品九九久久精品小草,歪歪视频