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A hammer test is an impact test conducted by dropping weights from increasing heights until a specified deflection of the weight is produced.
A Hammer Test (also known as the "Dead Ring Test") is a part of the prefill inspection process for High Pressure Steel cylinders, mandated by the D.O.T. This test is done to verify that the cylinder contains no liquid or has excess corrosion. It is performed by gently striking the center of the body of a cylinder with a metal object, typically a hammer or wrench. The expected result is a ring-like tone that slowly fades. If a thud or clunk is heard, the cylinder should not be filled with high pressure gas and should be inspected more closely. For more specific details, see CGA publication P-15, section 4.8.