The issue of pipe wall thickness

This is a high-pressure pipeline, and the standards for high-pressure pipelines used in fertilizer production set by the Ministry of Chemical Industry should be applied.

It is recommended to select in accordance with the standards for high-pressure pipelines

You only talked about pressure; temperature must not be forgotten. It is best to choose according to the pipe’s designation, and determine the wall thickness through calculations that take pressure, material, and operating temperature into account; this makes it much safer. The wall thickness of pipe fittings: The most scientific way to express the wall thickness of a pipe is by using the pipe’s Sch number, which indicates the wall thickness category. This value is calculated as the ratio of the stress required of the material at the design pressure and design temperature, multiplied by 1000, and then rounded off to an integer. It is expressed as: Sch = p / *1000. Where: p represents the design pressure in MPa; σ represents the allowable stress of the material at the design temperature in MPa. The pipe designation (Sch) indicates the wall thickness series, not the actual wall thickness. The actual wall thickness varies for the same diameter across different pipe specifications. The designation data for seamless pipes and welded pipes can be found in the relevant tables. According to standard HG20553, for Sch20 pipes with DN100 and a diameter of ￠108, the wall thickness is 5 mm; for Sch40 pipes with DN50 and a diameter of ￠57, the wall thickness is 4 mm. In this case, a heterodiameter pipe of DN100×DN50 should be selected, and welding is permitted when using Sch40 material. Therefore, the meaning of Sch clearly indicates that it is safe and reliable under these operating conditions.