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If external Ultrasonic thickness readings were <br /> 4.2(g) not taken from the external deck, perform the X <br /> UT inspection. <br /> Visually inspect all internal roof penetrations <br /> 4.2( h) for corrosion,wastage, and general X <br /> degradation. <br /> 4.2 i <br /> ( ) Inspect all internal roof penetrations welds for <br /> cracks, pinholes, and structural integrity. X <br /> UT inspect roof pipe columns for pipe internal <br /> 4.2(�) corrosion. X <br /> Floating Root Visually inspect and hammer test deCKplates. <br /> Inspection (In sour service, inspect all deck plates weld X <br /> Page No.6 of 7 <br />