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Gas cylinders and large transport vessels used for industrial compressed gases are subjected to hydrostatic retests. In this paper are presented results of an investigation concerning how to apply acoustic emission tests during such periodic inspections to detect flaws, i.e. internal corrosion and cracks. In conclusion a method for the periodic inspection (hydrostatic test with an acoustic emission testing) of such vessels is proposed. This method allows safe extension of the interval between re-tests.
periodic inspection, gas cylinders, pressure vessels, acoustic emission, flaws detection
Materials Manager, L'Air Liquide, Paris,