Why, in GB151, when the design pressure of the tube side of a heat exchanger is higher than that of the shell side, it is necessary to increase the test pressure on the shell side, whereas when the shell side pressure is higher than that of the tube side...
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Why is it necessary to increase the test pressure for the shell side when the design pressure of the tube side in a heat exchanger as specified in GB151 is higher than that of the shell side, whereas there is no requirement to raise the hydraulic test pressure for the tube side when the shell side pressure is higher than the tube side design pressure?
Haiyou needs to understand this from the perspective of the pressure testing process for shell-and-tube heat exchangers, as well as whether it is possible to conduct a thorough inspection of the pipe joints when testing under high pressure.
It means that the shell side section of the tube sheet joint blocks the view, right?
One of the methods used to check the tightness of the connection between the tube and the tube sheet