Ductile iron pipes are basic common sense ( 3) - - Xin, Nicholson

by:XEX     2021-02-06
A: ductile iron pipe anticorrosion treatment 1. Bituminous paint coating bituminous paint coating is used for conveying gas pipeline. Spray paint on the pipe before preheating can improve the adhesion of asphalt paint, to accelerate the drying, cement mortar lining + 2 common coating that is suitable for transporting sewage pipeline anticorrosion measures, can improve the corrosion resistance of lining. 3. Epoxy coal tar coating epoxy coal tar coating was applied to gas pipeline, can also be applied to sewage pipe. It is a kind of two-component coating, the coating has good adhesion and 4 very smooth surface. Epoxy ceramic lining of ceramic epoxy lining applied to sewage pipeline and gas pipeline, but due to the manufacturing process is difficult, the cost is high, so there are some limitations on use. Epoxy ceramic lined with high adhesion and bright and clean degree, is a kind of excellent corrosion resistant coating. 5. Aluminate cement and sulfate cement coating of these two kinds of special cement coating are suitable for sewage pipe with the ductile cast iron pipe corrosion protection, improve the erosion ability of resistance to acid-base components in sewage. 6. Polyurethane coating is a kind of special coating, a kind of high grade coating 2: antirust processing performance of nodular cast iron nodular cast iron pipe is a kind of cast iron, is a kind of an alloy of iron, carbon and silicon. Exists in the form of spherical graphite in ductile iron, usually the size of the graphite is 6 - Level 7, the quality requirements on pipes of nodulizing grade 1 - control Level 3 ( Spheroidization rate of 80% or higher) , and got better improvement on the mechanical properties of the material itself, has the nature of the iron, the performance of the steel. After annealing of nodular cast iron pipe, the microstructure of ferrite and a small amount of pearlite, better mechanical properties. Three: ductile iron pipes and advice using standard GB/T 13295 - 2003 water and gas pipeline using ductile iron pipes, pipe fittings and accessories of GB/T 17457 - 1998 nodular cast iron pipe cement mortar centrifugation lining of GB/T 17458 - general requirements 1998 nodular cast iron pipe cement mortar centrifugation lining of new mixing mortar test GB/T 17459 - ingredients GB/T 17456 1998 nodular cast iron pipe asphalt coating nodular cast iron pipe appearance of GB/T 17219 - spraying zinc 1998 ShuPeiShui equipment and protective materials for domestic and drinking water safety evaluation standard of 2. Engineering standards of the building water supply and drainage and heating engineering construction quality acceptance specification 'GB50242 - 20023. Relevant standard drawing 03 ss505 the flexible interface water supply pipeline piers choose proposal 1 to the ductile iron pipes should be selected according to the installation, choose the interface form of straight pipe and fittings. 2 recommended use epdm rubber circle and so on. 3 the choice of coating: according to the use of internal and external conditions to choose suitable and coating. Existing internal coating for interior and exterior coating epoxy resin, resin, PE film coating ductile iron pipes such as new products, when choose, should understand its performance in detail.
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