Material selection for expansion joints
Thread Content
Must the material for wave expansion joints used in heat exchangers be selected only in accordance with GB16749-1997? Is it possible to use other materials?
316L can definitely meet the requirements for ordinary carbon steel and stainless steel.
The key issue is that with a design pressure of 2.0, a design temperature of 300, and a diameter of 1400, calculations using SW6 software show that the strength of the expansion joint is insufficient; it does not meet the requirements
The material should be selected based on the material used for the shell side; if the shell is made of carbon steel, 304 can be used as the material for the expansion joint body； If the shell side is made of a non-carbon steel material, the expansion joint material follows the shell material. If the strength is insufficient, an Ω-type expansion joint can be used; I’ve encountered this situation before as well. In China, Nanjing Chenguang does a decent job on this type of expansion joint. Have them provide you with the stiffness values and dimensional parameters of the expansion joint, and then use those values in SW6 to meet your requirements regarding stiffness or displacement.