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Pressure testing water temperature

2023-02-26View Original

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According to GB/T150.4-11.4.9.3, the hydrostatic test temperature for Q345R shall not be lower than 5 degrees, while for other carbon steels it shall not be lower than 15 degrees. There is one heat exchanger in which both the shell side and the tube bank are made of Q345R, whereas the heat exchange tubes are made of 20#. So, during the water pressure process, what should be the standard temperature of the water – not lower than 5 degrees or 15 degrees? For most tanks or towers made of Q345R, the nozzles used are of 20# grade; so how should the water temperature be selected in such cases? If the selection standard is set at 20#, it should not be lower than 15 degrees; then what is the meaning of this standard?

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