2. Corrosion analysis of the inlet and outlet pipelines of the acid pump 2.1 Corrosion analysis of the inlet pipeline According to the requirements of PetroChina's alkylation unit corrosion control, when carbon steel is used, the flow rate of sulfuric acid should be controlled at 0.6 m/s to 0.9...

Abstract: 98% sulfuric acid is a highly corrosive strong mineral acid. It has great oxidizing properties, dehydrating, acidity, water absorption and is hard to volatilize. However, at room temperatures, a dense oxide film can be formed on the surface of carbon steel to inhibit the occurrence of corrosion due...

The application background of seamless steel pipes & welded steel pipes under comprehensive pipe gallery engineering conditions Comprehensive pipeline galleries have developed rapidly in China this year. In 2013, the State Council proposed to reform the construction of a municipal underground pipeline...

Corrosion is a spontaneous process of materials. In nature, substances will spontaneously change from a high-energy state to a low-energy state in order to maintain energy conservation. Iron mostly exists in the form of iron ore in nature, and its state is relatively stable. When iron ore is given the energy...

At present, the mainstream gas pipelines are cast iron pipes, PE pipes and steel pipes. The materials used for steel pipes are divided into several kinds. Take 20 steel, Q345D and L290M as examples for research in this article. Some defects of the pipeline made from the above several materials are...

1.4 Crack sensitive steel types of quenching cracks Certain high-grade seamless steel pipes have a high content of alloying elements and high strength of the pipe body, so the strength factor of the stress field is relatively high. They are steel types that are sensitive to cracks. The surface...

Abstract: According to the characteristics of manufacturing processes of seamless steel pipes, combined with macroscopic morphology and microstructure analyses, it is believed that the main causes of quenching cracks in seamless steel pipes are surface defects, stress cracks and surface recarburization....

There are three kinds of pipes that can be used for conveying gas: ductile iron pipes, welded steel pipes and PE pipes.   Ductile iron pipes A ductile iron pipe refers to a pipe that is made from molten iron with the size 18 or above by adding a nodulizer, and then it passes through a centrifuge with high...

Stainless steel heat exchanger tubes have very good antioxidation properties, and are safe and sanitary, which are widely used in food, medicine, heating, domestic water, air-conditioning backflow and other fields. Stainless steel heat exchanger tubes have better heat transfer effects than those of...

Main features of coated steel pipes The anti-corrosion coating used for the coated steel pipe is the solvent free epoxy coating, and the solidified coating has corrosion resistance, hardness and compactness. The safe and reliable connection method of 3PE anti-corrosion steel pipe made from polyethylene...