The baffled region of a heat exchanger owing to the space required to allocate inlet and outlet nozzles Unsupported tube spans adjacent to the tubesheets are frequently longer than those in Susceptible to flow-induced vibration failures than the inner rows.ģ. Outer rows of U-bends have a lower natural frequency of vibration and therefore are more
These restricted areas usually create high local velocities that can result in damaging flow-induced vibration.Ģ. In these regions, impingement plates, small nozzle diameter, or large outer-tube limits can contribute to restricted entrance or exit areas. Tube failures have been reported in nearly all locations within a heat exchanger. Please Note.(Some explanation for U-type exchanger and other vibration terms) I know some acoustic resonance may be corrected by adding a deresonating baffle parallel to the cross flow direction to increase the shell acoustic frequency, but I don't know where I can key in the HTRI.Ĭould you please give me any good suggestion? I really appreciate your comment and help. Also, I already tried to reduce baffle spacing, increase the tube pitch, and increase nozzle diameters to reduce vibration, but in vain.
Unknown parameter could be calculated by HTRI design mode.Ĭould you please give me a help about the following question?ġ.Why the U type heat exchanger, tube pass can't over 4 pass.Ģ.As I run into a lot of vibration warning message, I put vibration support inlet / outlet, but I still have acoustic vibration and bundle entrance / shell entrance velocity exceed 80% of critical velocity. Unknown variable need to be key in in HTRI design mode: The propose of this design is to use HTRI to meet the owner's spec rule, and get the minimum heat transfer area or maximum heat transfer coefficient when delta P values of both fluid close to the maximum allowable delta P. (Note tube side inlet p=3.075barg, delta P =0.075bar Shell side inlet p=3.7barg, delta P=0.7bar). This operation is performed with cooling water (56000kg/hr) from 10C to 20C. It is desired to cool down 1260kg/hr of Mixed Gas having properties in below table from 70 C to 15C.