Determination of the maximum operating pressure for different containers
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According to HG/T20570.1, the maximum operating pressure for internal-pressure vessels is the highest pressure that may occur at the top, while for external-pressure vessels it is the maximum difference between the internal and external pressures at the top. Why isn’t the maximum operating pressure of a pressure vessel equal to the external maximum pressure? Rather, the greatest difference between the inside and outside? Or is the maximum operating pressure of a pressurized vessel also the difference between the internal and external pressures?
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