Questions regarding the hydrostatic test pressure for the tube side and shell side of shell-and-tube heat exchangers
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There is currently one heat exchanger: DN400, with the shell material being Q345R. The design pressure for both the tube side and the shell side is 6 MPa, and the design temperature is 300°C. The test pressures calculated using SW6 are 9.05 Mpa for the tube side and 8.33 Mpa for the shell side. After review by the design institute, it was found that there were issues with the test pressure. The value of the test pressure specified in GB150 is defined as shown in the figure. Now, I would like to know how formulas should be selected for the tube side and shell side if calculations are not done using software, but only through manual calculations Is it positive pressure or negative pressure?
The description is incorrect; should it be internal pressure or external pressure?