Common problems of pvelite: Calculation of shear stress of tubesheet
ASME 2019 version of the code on the allowable shear stress of the pipe plate has been modified, the previous version of the code allowable shear stress of 0.8S, while the 2019 version of the code to Min (0.8S, 0.533Sy), where S is the allowable stress at the design temperature of the pipe plate, Sy is the yield strength at the design temperature of the pipe plate, for peers who did not pay attention to this point, may lead to the use of the 2017 version of the code and The deviation of the calculation results using the 2019 version of the code.
In addition, for the ASME UHX Subpart, the U-tube heat exchanger shear stress assessment is located in UHX-12.5.9 Step 9, the fixed tube and plate heat exchanger shear stress assessment is located in UHX-13.5.8 Step 8, and the floating head heat exchanger shear stress assessment is located in UHX-14.5.8 Step 8.
Where Ps is the design pressure on the shell side, Pt is the design pressure on the tube side, h is the thickness of the tube plate, μ is the base coefficient for shear stress calculation, and Do is the diameter of the tube laying circle, refer to Figure UHX11.3-1 Figure a
Cp is the circumference of the pipe circle, refer to Figure UHX-12.2, Ap is the area of the pipe circle based on Cp
PE is the effective pressure, ao is the effective radius of the tube laying circle, other parameters refer to U-tube heat exchanger
Refer to the definition of fixed tube and plate heat exchanger.
Application note in PVElite.
In PVElite if the tube plate layout circle circumference and area are not given may lead to inaccurate calculation results, please pay attention to the input of tube plate data.