1.1 ,This practice2 covers the procedures for eddy-current examination of nickel and nickel alloy tubes. These procedures are applicable for tubes with outside diameters up to 2 ,in. (50.8 ,mm), incl, and wall thicknesses from 0.035 to 0.120 ,in. (0.889 to 3.04 ,mm), incl. This standard applies to procedures where the sensor is placed on the outside surface of the tube. These procedures may be used for tubes beyond the size range recommended, by contractual agreement between the purchaser and the producer.