What material are the pipelines in the hydrocracking reaction system made of?
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In the reaction system, some parts use p11, some use pt347, and some use 316L. What are the principles and requirements for their use? The more detailed, the better
PT347 maintains stable performance over long periods under high temperature, high pressure, and highly corrosive conditions； The high-temperature performance of 316L is not as good as that of 347; it is generally used in conditions of low temperature, high pressure, and high hydrogen sulfide levels ； P11 molybdenum steel also has decent high-temperature performance, and is commonly used in high-temperature medium-pressure steam applications.
The material selection principles can refer to SHT3096-2012 Guidelines for Material Selection in the Design of Equipment and Pipelines for High-Sulfur Crude Oil Processing Plants
There is also some material of type 625. Used in areas with the highest corrosion coefficient.