METHOD OF INSPECTING PRESSURE LEAKAGE

PURPOSE:To enable the correct inspection of the pressure leakage of plural hole parts at the same time by regulating in advance the temp. of the air to be fed to the respective hole part of a forming product and by preventing the temp. change among each hole part. CONSTITUTION:The air being branched to a pipe line 14b is fed to the hole part 34b of an object 32 to be inspected and the hole part 38b of a reference master 36 with its temp. being regulated to the prescribed value by a surge tank 16b, then with being regulated to the different pressure from the pipe 14a by a pressure regulator 18b and the pressure leakage is measured. The air in the pipe line 14c is regulated to the prescribed temp. at the surge tank 16c, regulated to the different pressure from the pipe lines 14a, 14b by a pressure regulator 18c, fed with being branched to the hole part 32c of the object 32 and the hole part 38c of the master 36 and the pressure leakage is inspected. Since the air pressure of respective hole part varies like this, and individual detection is made possible and yet the inspection under the same conditions can be performed owing to there being no temp. difference among each hole part.