ASTM_A_531_-_A_531M_-_13.pdf

Designation:A531/A531M13Standard Practice forUltrasonic Examination of Turbine-Generator Steel RetainingRings1This standard is issued under the fixed designation A531/A531M;the number immediately following the designation indicates the yearof 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*1.1 This practice covers ultrasonic examination of turbine-generator retaining rings produced in accordance with Speci-fications A288 and A289/A289M with an inside diameter towall thickness ratio equal to or greater than 5:1 and with wallthicknesses from 1 to 4 in.25 to 102 mm.1.2 Forgings may be inspected by either the contact or theimmersion methods,or combinations thereof,as agreed uponbetween the manufacturer and the purchaser.1.3 Supplementary requirements of an optional nature areprovided for use at the option of the purchaser.The supple-mentary requirements shall apply only when specified indi-vidually by the purchaser in the purchase order or contract.1.4 This practice is expressed in inch-pound and SI units;however,unless the purchase order or contract specifies theapplicable“M”specification designation(SI units),the inch-pound units shall apply.The values stated in either SI units orinch-pound units are to be regarded separately as standard.Within the practice,the SI units are shown in brackets.Thevalues stated in each system may not be exact equivalents;therefore,each system shall be used independently of the other.Combining values from the two systems may result in noncon-formance with the standard.1.5This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2A288 Specification for Carbon and Alloy Steel Forgings forMagnetic Retaining Rings for Turbine GeneratorsA289/A289M Specification for Alloy Steel Forgings forNonmagnetic Retaining Rings for GeneratorsE127 Practice for Fabricating and Checking Aluminum Al-loy Ultrasonic Standard Reference BlocksE317 Practice for Evaluating Performance Characteristics ofUltrasonic Pulse-Echo Testing Instruments and Systemswithout the Use of Electronic Measurement Instruments2.2 Other Documents:ANSI/ASME B46.1 Surface Texture(Surface Roughness,Waviness and Lay)Recommended Practice No.SNT-TC-1A Personnel Qualifi-cation and Certification in Nondestructive Testing33.Personnel Requirements3.1 Personnel performing ultrasonic examinations to thispractice shall be qualified and certified in accordance with awritten procedure conforming to Recommended Practice No.SNT-TC-1A or other national standard acceptable to both thepurchaser and the supplier.4.Ordering Information4.1 When this practice is to be applied to an inquiry,contract,or order,the purchaser shall so state and shall alsofurnish the following information:4.1.1 The method or combination of methods to be used forinspection.4.1.2 The frequency to be used for conducting each inspec-tion.4.1.3 Report requirements including C-scan plot,if appli-cable.4.1.4 Supplementary requirements,if any.5.General Requirements5.1 As far as possible the entire volume of the retainingrings shall be subject to ultrasonic inspection.Circumferentialand axial faces shall be machined flat and parallel to oneanother.1This practice is under the jurisdiction of ASTM Committee A01 on Steel,Stainless Steel and Related Alloysand is the direct responsibility of SubcommitteeA01.06 on Steel Forgings and Billets.Current edition approved May 1,2013.Published June 2013.Originallyapproved in 1965.Last previous edition approved in 2012 as A531/A531M 12.DOI:10.1520/A0531_A0531M-13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available fromAmerican Society for Nondestructive Testing(ASNT),P.O.Box28518,1711 Arlingate Ln.,Columbus,OH 43228-0518,http:/www.asnt.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.2 The ultrasonic inspection shall be performed after finalprocessing and heat treatment for properties,unless otherwisespecified in the order or contract.5.3 Rings may be tested either stationary(contact)or whilerotating(immersion).If not specified by the purchaser,acombination of methods may be used at the manufacturersoption.Scanning speed shall not exceed 6 in./s 15 cm/s,unless automatic recording(C-scan)equipment is employed.5.4 To ensure complete coverage(during contact testing),the search unit shall be ind