Purpose: This procedure covers ultrasonic inspection of tubular@ centrifugally-cast@ corrosion-resistant steel cylinders. Application: This procedure has been used typically for locating defects such as cracks@ voids@ spongy areas@ and other discontinuities@ but usage is not limited to such applications. This procedure is not applicable to austenitic steels where grain boundaries mask results. Immersion inspection is applicable to tubular products whose wall thickness is 0.5 to 9.0 inches (13 to 229 mm). Contact inspection is applicable to tubular product whose wall thickness is 3.0 to 9.0 inches (76 to 229 mm).