When designing pipelines for corrosion resistance, it is an important principle in structural design to prevent liquid from staying stagnant

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　 A catalytic cracking unit at a large refinery features 64 kilometers of aluminum piping; in suitable areas, these aluminum pipes are bundled together and fixed inside channel steel, with the flanges of the channel steel facing upward. During testing, many of the aluminum tubes could no longer withstand pressure. Inspection revealed numerous erosion pits, some of which were perforated. Using channel steel to support aluminum pipes is a common design. But here, the potential corrosive effects of such a design on aluminum tubes are ignored. Channel steel with the flanges facing up tends to accumulate water, as well as various types of trash and dirt. It is expected that aluminum pipes immersed in such wastewater containing various corrosive substances will suffer severe corrosion and perforation. Therefore, if channel steel supports are to be used, measures should be taken to prevent water accumulation, and installing drainage holes is a simple and effective method. Make sure the size and number of drainage holes are sufficient. To ensure smooth drainage and prevent blockages. Additionally, care must be taken during construction to prevent the aluminum pipes from being contaminated. Preventing liquid stagnation is an important principle in structural design. Because the accumulation of fluid leads to an intensification of corrosive conditions in the local area. Therefore, the interior of the container and piping systems should be streamlined and slightly inclined downstream and toward the outlet to facilitate liquid flow and discharge; a drain valve should be installed in the recessed sections of the pipes.