Abstract
This paper studies influence of the magnitude of charging-pressure-step and the pressure measuring time to the error of leak detection by the pressure charging method. In this method, compressed air is charged into a vessel whose leak should be examined. A leak changes the pressure in the vessel after the charging. However, the heat transfer around the vessel also changes the pressure. When the charging pressure is low, the temperature rise due to the compression is low; hence the thermal effect is small by low charge pressures. The experimental results in this study indicate that tests with higher pressures induce greater difficulty in leak detection. They also show that a longer duration of the pressure measurement decreases the error of the leak detect.
