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इंटरनेट मानक Disclosure to Promote the Right To Information Whereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. “जान1 का अ+धकार, जी1 का अ+धकार” “प0रा1 को छोड न’ 5 तरफ” Mazdoor Kisan Shakti Sangathan Jawaharlal Nehru “The Right to Information, The Right to Live” “Step Out From the Old to the New” IS 4904 (2006): Calibration blocks for use in ultrasonic non-destructive testing [MTD 21: Non-Destructive Testing] “!ान $ एक न’ भारत का +नम-ण” Satyanarayan Gangaram Pitroda ““IInnvveenntt aa NNeeww IInnddiiaa UUssiinngg KKnnoowwlleeddggee”” “!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता हहहहै””ै” Bhartṛhari—Nītiśatakam “Knowledge is such a treasure which cannot be stolen” IS4904:2006 . Wil’w Indian Standard CALIBRATION BLOCKS FOR USE IN ULTRASONIC NON-DESTRUCTIVE TESTING — SPECIFICATION (Fourth Revision ) Ics 19.100 .,,, 0 BIS2006 BUREAU OF INDIAN STANDARDS ‘MANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG NEW DELHI 110002 January 2006 Price Group 3 Non-destructive Testing Sectional Committee, NtTD21 . FOREWORD This Indian Standard ( Fourth Revision ) was adopted by the Bureau of Indian Standards, after the draft finalized by Non-destructive Testing Sectional Committee had been approved by the Metallurgical Engineering Division Council. This standard was first published in 1968 and subsequently revised .in 1972, 1982 and 1990. The third revision issued in 1990, gave recommendations for the use of calibration blocks in ultrasonic flaw detection. As the application of blocks for calibrating various characteristic of flaw detection equipment is covered in details in IS 12666:1988 ‘Methods for performance assessment of ultrasonic flaw detection equipments’, ithas been decided to confine this fourth revision to specification for blocks only. Ultrasonic flaw detection is widely used for assessing, non-destructively the homogeneity and internal soundness of metals and metal products. A wide variety of ultrasonic flaw detectors is now commercially available. The manufacture of ultrasonic flaw detectors with their associated probe system is, however, not governed by any recognized specification. Further, the performance of the instrument varies or changes with usage due to variations of changes in the characteristics of the electronic components employed in it. The performance of the probe system also undergoes changes or variations due to variations in crystal mounting or wear of the probes. It is, therefore, necessary to maintain the sensitivity of an ultrasonic flaw detector and its probe system within narrow limits, ifitisto berelied upon for quantitative results. Complicated electrical measurement might be used-toascertain the performance characteristics but the carrying out of such measurements are not easy for use in practice. The current trend has, therefore, been to use carefully selected blocks of metal of specified size and shape containing suitably located reflecting surfaces for the purpose of checking the instrument and probe characteristics and to calibrate, control and verify the adjustments involved during actual inspecti’d”nso that consistent results may be obtained and these may be expressed on a common basis. Reference blocks of varying character, intended for such purposes, have been developed by individual organizations in different countries. The purpose of this standard is essentially to provide a range of suitable blocks by which use singly or in combination the overall characteristics ofultrasonic flaw detection equipment can be calibrated and verified. Inthis revision following modifications have been carried out: a) Reference clause has been updated since IS2853 ‘Methods ofdetermining austenitic grain size insteel’ has been withdrawn and replaced with IS4748:1988 ‘Method for estimating average grain size ofmetals (first revision )’, b) Material clause has been modified. c) Dimension clause has been modified. d) Legends under Fig. 6 has been added. For the purpose of deciding whether a particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS2: 1960 ‘Rules for rounding Qffnumerical values (revised)’. The number of significant places retained inthe rounded off value should be the same as that of the specified value inthis standard. IS 4904:2006 Indian Standard CALIBRATION BLOCKS FOR USE IN ULTRASONIC NON-DESTRUCTIVE TESTING — SPECIFICATION (Fourth Revision ) 1 SCOPE free from internal flaws. 1.1 This standard ( fourth revision ) prescribes 3.3 Final preparation of blocks shall be by light the material, dimensions and surface finish of steel grinding. Burnishing of the surface and surface blocks used for calibration of ultrasonic flaw hardening shall not bepermitted. The surface ofthe detection equipment. facesantiedgesshallgenerally bemachined toRvalue notgreater than 0.8 micron (see IS 10719 ). 1.2 The blocks prescribed may be selected, as appropriate, for evaluation of various parameters 3.4 The material used for-making blocks shall be of ultrasonic flaw detection equipment under either tested for ultrasonic attenuation after heat laboratory conditions or on a site conditions treatment. The local variations of attenuation (see 1S12666). shall not exceed +1 dB ( +0.02 dB/mm of block dimension ) when tested with compressional waves 2 REFERENCES inthe frequency range 4to 6MHz. The following standards contain provisions ‘which 3.5 The velocity of the compressional wave in the through reference inthis text, constitute provisions material of the block shall be specified by the ofthisstandard. Atthetimeofpublication, theeditions manufacturer within the accuracy of+ 1m/s. indicated were valid. All standards are subject to revision and parties to agreements based on this 3;6 InVi block, the equivalent thickness ofthe steel standard are encouraged to investigate thepossibility for the perspex insert shall be50+0.1 mm. ... ofapplying the most recent editions ofthe standards 4 DIMENSIONS indicated below: 4.1 The dimensions of the calibration blocks shall IS No, Title conform to those inFig. 1to 6. The opposing faces 4748:1988 Method for estimating average of the blocks shall be parallel within + 0.10 mm grain sizeofm etals (first revision) and the adjacent faces shall be perpendicular within + 5mmof arc. Wherever possible, the limits 10719:1983 Method of in dicating surface on dimensions shall beheld tol 0.10 mm. texture on technical drawings 4.2 Onblocks V1and V2,the O(zero) marking for 12666.:1988 Method forperformance assessment probe index shall be done on both the sides. of ultrasonic flaw detection equipment 5 PACKAGING OF BLOCKS 3 MATERIAL 5.1 Each block shall bepacked inastrong case with an identification plate. The case shall be recessed 3.1 The material used for the manufacture ofblocks inboth the base andthe lid inorder to accommodate shall be low or medium-carbon steel, fully killed, the block, and oiled felt shall be provided for normalized to produce afine grain structure having both recesses to keep the test surfaces free from grain size corresponding to Mc Quaid Ehn No. 5or corrosion. Suitable means shall be provided for finer when determined in accordance with IS 4748 carrying the case. and shall be homogeneous throughout. The test 5.2 If wood isused in the manufacture of the case, for grain size of material shall be carried out before care shall be taken to ensure that the wood does not making the blocks. contain chemicals as it would have a deleterious 3.2 The blocks shall bemade from wrought material effect on the block. 185.1 - \ 1562 - 135 - 1184 < - B- 937 84 “ rx-J W I -#- PERSPEX MATERIAL (POLYMETHYL -METHACRYLATE) 35 165 1= 100 I . . + ‘A 300 w SILVER COATED mI “-= I N SURFACE m ~.mII I F lB - 205.1 - lfb7 1174 - 1 6& 65” 70” 75” 60” t @- ’’”k’ .,!,.,,,!,.,4,,!!5,.0l$.1.!!.,.,! !,O1!,,0!,0!,,,!,,,!,.,.,.,,, 15,,0.,,,,,!,.,.,.,.,.200 b 75: @o” 91 -1 120.1 2o11 - lC All dimensionsin millimetres. FIG. 1 BLOCKV 1DIMENSIONS 2 IS 4904:2006 S & 28.6 – . 23.8 . > 20 16* > 50 1- 2.5 All dimensions in millimetres. NOTE — The thickness maybe either 12.5 mmor20mm -and thetarget hole mayhave adiameter of either 1.5 mmor 5 mm. Blocks having athickness of20mmand a target hole 1.5mmdiameter aregeneraliy preferred. FIG.2 BLOCKV2 DIMENSIONS 50 J ... %? RESOLUTION ADDITIONAL HOLES HOLES SFACEC (OPTIONAL) AS SHCNVNIN N* K VIEW (C) m BELOW - ‘: ~ 1 L8 . ‘ 35 83 ‘ * 305 . (A) II Ilnl t-l ALL HOLES 1.5mm DIA. (c) All dimensions in millimetres. FIG.3 BLOCKA5 DIMENSIONSB,EAMCALIBRATIONBLOCK 3 IS 4904:2006 I---7 F--l .2.5 1 I 3x#I 9C’BORE I 17 L--- —-- J 50 ---.+--i L--- [::::.1 ----, ---- 5 a All dimensions in millimetres. FIG.4 BLOCKA6 DIMENSIONS I v 15 I ---- . . . _____ , 15 -- —-. ____ -—-. ___ t .—— — 15 I ---- —_- —-- 1% , I All dimensions in millimetres. FIG.5 BLOCKA7 DIMENSIONSR,ESOLUTIONBLOCK IS 4904:2006 SIDE ~ 50 1 -R6 u------------;---- ----- ----- ----- A i- t r SCALE 5 . SCREW~ bLOT IN SCALE ‘SCALE ‘S’ E- D“ D TOP VIEW SIDE VIEW C’ 85 #- b n-.. - -------- -—----- ———-—- --- —--- . B’ BOTTOM VIEW All dimensions in millimetres. Holes H, H2H3 f2ic7mefer : l.5 * 0.1 mm each Depth : 6.0 * 0.2 mm each Scale Vrickrress : 2 l 0.5 mm Width : 25* l.Omm .FixingArrangements :The scale shall slide easily over the block. It shall have provision to secure by fly nuts or any other device and any position parallel to edge CD. FIG.6 BLOCKA8 DIMENSIONSS,URFACEWAVEBLOCK 5