The main pipes for buried gas pipelines are cast iron pipes, PE pipes, and steel pipes. The nature of each pipe determines the strength, plasticity and corrosion resistance of the pipeline. Therefore, choose suitable pipes based on research on the use environment and characteristics of...

1.5 Metallographic inspection Cut 3 pieces of metallographic samples along the base material of the leaking pipe, the largest opening and crack tip of the leakage port from the cross section. The etchant is the nitric acid alcohol solution with 4%. The metallographic samples are observed by...

Abstract: The leakage at the four tubes such as the water-cooled wall, superheater tubes, reheater tubes, and economizer tubes in a power station boiler is one of the important factors that cause the unplanned shutdown of the unit. In order to deeply analyze the leakage of the butt welding seam of the reheater...

2. Economic analyses of pipes based on the internal optimized anti-corrosion coating Although epoxy ceramic internal anticorrosion will increase the investment, its roughness is small. The pipe diameter can be appropriately reduced, thereby reducing the unit price of pipeline construction and installation....

Abstract: Steel pipes and ductile iron pipes, as the first choice in the construction industry, have their own advantages and disadvantages. The economy of pipe engineering from the perspective of investment is analyzed, providing economic value reference for the comparison and selection of engineering pipes. For...

Features of high pressure boiler tubes The material of the high-pressure boiler tube will creep because it works under high temperature and high pressure for a long time, resulting in a decline in plasticity and toughness, change of the original structure and corrosion. The steel pipe used for the...

The main influencing factors of corrosion of OCTG pipes PH value: Hydrogen ion is a cathode depolarizer. Generally, the lower the PH value is, the more serious the metal corrosion becomes. When the pH value is greater than 6.6, the corrosion rate begins to decrease.   Cl- or total salinity:...

The classification of heat-supply pipelines According to the different flow media in the pipe, it can be divided into steam pipes and hot water pipes. According to the different working pressure, the heat-supply pipeline can be divided into three types: low pressure, medium pressure and high pressure pipelines. According...

Welded steel pipes, also known as seamed steel pipes, are generally made by coil weld with steel plates or band steel. Classification according to the surface treatment of pipes Welded steel pipes can be divided into galvanized and non-galvanized steel pipes. The galvanized surface of the...

The seamless steel pipe can be divided into the following five categories. 1. Seamless carbon steel pipe Commonly used manufacturing materials are 10, 20, 16Mn steel. The specification of the pipe is as follows: Hot rolling outer diameter: φ32-630mm. Cold drawing outer diameter: φ6-200mm. Single pipe...