tailieunhanh - Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings

"Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings" covers turbine and generator steel rotor forgings covered by Specifications A469/A469M, A470/A470M, A768/A768M, and A940/ A940M. This standard shall be used for contact testing only. | Designation A418 A418M 15 Standard Practice for Ultrasonic Examination of Turbine and Generator Steel Rotor Forgings1 This standard is issued under the fixed designation A418 A418M the number immediately following the designation indicates the year of original adoption or in the case of revision the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon indicates an editorial change since the last revision or reapproval. 1. Scope should be recognized as a possibility. Rigid control of the This practice for ultrasonic examination covers turbine actual frequency used the coil bandpass width if tuned and generator steel rotor forgings covered by Specifications instruments are used and so forth tend to reduce the overall A469 A469M A470 A470M A768 A768M and A940 inaccuracy which is apt to develop. A940M. This standard shall be used for contact testing only. This practice for inspection applies to solid cylindrical This practice describes a basic procedure of ultrasoni- forgings having outer diameters of not less than in. 64 cally inspecting turbine and generator rotor forgings. It does mm nor greater than 100 in. 2540 mm . It also applies to not restrict the use of other ultrasonic methods such as cylindrical forgings with concentric cylindrical bores having reference block calibrations when required by the applicable wall thicknesses of 64 mm in. or greater within the same procurement documents nor is it intended to restrict the use of outer diameter limits as for solid cylinders. For solid sections new and improved ultrasonic test equipment and methods as less than 15 in. 380 mm in diameter and for bored cylinders they are developed. of less than in. 190 mm wall thickness the transducer used for the inspection will be different than the transducer used for This practice is intended to provide a means of inspect- larger sections. ing cylindrical forgings so that the inspection sensitivity