NABL 108NABL NATIONAL ACCREDITATION BOARD FOR TESTING AND CALIBRATION LABORATORIES SPECIFIC CRITERIA for NON-DESTRUCTIVE TESTING LABORATORIES ISSUE NO : 02 ISSUE DATE: 28.03.2008 AMENDMENT NO : 00 AMENDMENT DATE: -- AMENDMENT SHEET Sl 1 Page No. Clause Date of No. Amendment Amendment made Reasons Signature QM Signature Director 2 3 4 5 6 7 8 9 10 National Accreditation Board for Testing and Calibration Laboratories Doc. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28.03.2008 Amend No: 00 Amend Date: -Page No: i 3.NO. 2.Contents S. Introduction Classes of tests Criteria for Accreditation Specific Criteria PAGE NO. SECTION Amendment Sheet Contents 1. 4.03.2008 Amend No: 00 Amend Date: -Page No: ii . No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. i ii 1 2 4 13 National Accreditation Board for Testing and Calibration Laboratories Doc. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. in workshops and in laboratories.1 Introduction Laboratories Accreditation activities are administered under the direction of the National Accreditation Board for Testing and Calibration Laboratories (NABL) and involving Technical Committees and Accreditation Committees as recommending bodies. components and assemblies by means of non-destructive testing techniques at field sites. It is basically applied to examine the material quality and to determine internal construction and dimensions. Fields of Testing • • • • • • • • • • • Biological Chemical Electrical Electronics Fluid Flow Mechanical Non-Destructive Optical and Photometry Radiological Thermal Forensic The field of NDT covers examination of materials. The information contained in this document must be read alongwith the document ISO/ IEC 17025:2005.03.2008 Amend No: 00 Amend Date: -Page No: 1/ 20 . National Accreditation Board for Testing and Calibration Laboratories Doc. This document on “Specific Criteria for Non-Destructive Testing Laboratories” is one of a series of supplementary booklets of the document ISO/ IEC 17025:2005 “General Requirements for the Competence of Testing and Calibration Laboratories”. NABL assessment system is based on ISO/ IEC 17011: 2004 and APLAC/ ILAC recommendations. Non-Destructive is one of the following fields of testing in which NABL currently gives accreditation. 03.2 Emerging Areas Testing Acoustic emission Holography Infra – red applications Leakage flux techniques Microwave applications Neutron radiography Real time radiography 2. 2.2008 Amend No: 00 Amend Date: -Page No: 2/ 20 .1 2.1 Metals and Alloys Eddy Current Testing Conductivity variation measurement Detection of surface and sub-surface defects Dimensional variations Irregularities in microstructures Variation in chemical composition 2. Each group is further classified into subgroups (classes). Applications for accreditation may be made for one more classes of tests.1.3 Leak Testing Argon leak test Detection of leak by pressure rise or pressure drop Halogen leak test Helium leak test Radio-isotope tracer leak test Ultrasonic leak test National Accreditation Board for Testing and Calibration Laboratories Doc. The classes of test are given hereunder.1.2 Classes of Tests The field of NDT is divided into two groups ‘metals and alloys’ and ‘building materials’. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28.1. 1.2.1.2.2 2.1.2008 Amend No: 00 Amend Date: -Page No: 3/ 20 .2.1.03.4 2. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28.5 Penetrant Testing Detection of surface flaws of materials with visible dye Detection of surface flaws of materials with fluorescent dye 2.2.6 2.2 2.1 2.2.7 Ultrasonic Testing Corrosion survey Detection of internal flaws Detection of surface and sub surface flaws Thickness measurements Measurement of variation in material properties 2.2.1.2.2.5 2.6 Radiography Testing Detection of flaws with radio isotopes Detection of flaws with X-rays 2.8 Under Water Testing Corrosion survey Detection of internal flaws Detection of surface and sub surface flaws Thickness measurements 2.3 2.7 Building Materials – Reinforced Concrete Structures Ultrasonic Pulse Velocity Tests Rebound Hammer Test Cover Meter Test Half Cell Potential difference test Carbonation test Deflection measurement data (Load Test) Crack width measurement in reinforcement concrete structures National Accreditation Board for Testing and Calibration Laboratories Doc.4 Magnetic Particle Testing Detection of sub surface flaws Detection of surface flaws 2. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. under close supervision.1 Officers Exercising Technical Control The officers must have authority and time for effective control of the nondestructive testing operations that they superintend. ii. and expertise in use of. under direction.03. 3. Knowledge of relevant materials. including the drafting of specifications for meeting requirements of standards and codes. Officers exercising technical control – those who are responsible for control of non-destructive tests. They should have: i. can take responsibility for performance of specific procedures. 3. ii.2 Staff Structure The Board classifies non-destructive testing staff into three tiers (categories): i. iii. Sound knowledge of. National Accreditation Board for Testing and Calibration Laboratories Doc.2. applicable non-destructive testing techniques.1 Staff The Board needs to satisfy that testing services have at least one person who has the competence. Experience and ability in interpretation of data from relevant service conditions.2008 Amend No: 00 Amend Date: -Page No: 4/ 20 .3 Criteria for Accreditation This section provides interpretations of some of the clauses of ISO/ IEC 17025: 2005. and iii. Officers who. time and authority to achieve adequate technical control of its operations. 3. Assistants who perform routine technical an non-technical duties. manufacturing processes and service conditions. A large testing service may need more than one such person. They should have a level of knowledge that would enable them to obtain the relevant ISNT/ ASNT/ Level II qualification. 3.3 Assistants Assistants must have knowledge and experience commensurate with the duties that they are required to perform.03. adequate training and have the level of knowledge that would enable them to gain the relevant ISNT/ ASNT/ equivalent Level III qualification.iv. Experience in use of relevant codes and standards.2008 Amend No: 00 Amend Date: -Page No: 5/ 20 . iv. Ability to prepare routine and critical reports. In addition. and Ability to control quality of performance of non-destructive tests. Persons controlling a significant range of non-destructive tests should have tertiary qualifications in science or engineering. v. A person who does not possess formal tertiary qualifications may be considered acceptable to exercise technical control if he has all the attributes as detailed above. they must have a background of knowledge and experience which enables them to understand the response for the purposes of the operations for which they are responsible. National Accreditation Board for Testing and Calibration Laboratories Doc. 3. ii. Experience and ability in interpretation of data from non-destructive tests. take responsibility for performance of specific tests as per procedure should have at least: i. vi. Ability to maintain job records and to prepare routine reports.2. and ability to prescribe suitable procedures in the absence of appropriate codes and standards. under direction.2. iii. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28.2 Officers Responsible for Carrying out Tests as per Specific Procedures Persons who. and ability to apply appropriate codes and standards to the requirements of specific projects. together with compensating practical experience. Experience in use of relevant codes and standards. Experience in performance of applicable non-destructive tests. 2008 Amend No: 00 Amend Date: -Page No: 6/ 20 . No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. The criterion of “competence in critical evaluation of test results” may extend signatory approval well down the staff scale.03.3 Equipment and Housing A testing service must be fully equipped for performance of all tests for which accreditation is sought.2.1 Magnetic Particle and Penetrant Testing. 3.4 Approved Signatory The role of NABL signatory is to ensure the reliability and adequacy of the test document. Adequate storage facilities must be available for equipment and records.5 Qualifications NABL recognizes the qualifications granted by ISNT/ ASNT or equivalent through its Qualifying Board as evidence of the possession of adequate general knowledge of a particular NDT method.3. is eligible for approval as a signatory for test documents. The mobile laboratories must provide facilities comparable to fixed laboratories. and occupies a position in his organization’s staff structure which makes him responsible for the adequacy of test results related. If tests are performed confirming to codes or standards which define particular items or types of equipment becomes mandatory. National Accreditation Board for Testing and Calibration Laboratories Doc. The performance of equipment and materials used for magnetic particle testing and penetrant testing must be checked periodically. it is obviously necessary for the officer Incharge on site to be an approved signatory. An approval may be limited to specific tests. When non-destructive testing is performed away from the base and prompt on-the-spot reports are required. 3. Any officer of a registered testing service who is competent to make a critical evaluation of test results.3.2. All equipment must be maintained in good condition. 3. or may be granted for all tests for which the testing service is registered. Equipment must be checked for performance in accordance with relevant standards. Reference density standards or a densitomater must be available for measurement of film density. Required accessories such as image quality indicators and intensifying screens must be provided. nature and location of items likely to be submitted for examination. They should cover the expected thickness range and the shape.3. The equipment should have stable electronic characteristics & should be checked for performance with standard calibrators as per specific codes. A separate work area for calibration and development work is desirable. Ultrasonic equipment of appropriate sensitivity and resolution for each application must be available. X-ray equipment and radioactive sources must be suitable for the materials to be examined. 3.2008 Amend No: 00 Amend Date: -Page No: 7/ 20 . Facilities must be available for viewing radiographs under optimum conditions of illumination. They must be adequate for the number of films to be processed.3 Radiographic Testing.3.3. The derive for tubular product testing system should have stable response without creating undue vibrations during testing. Records of checks must be kept.03. oscilloscope trace. Viewing facilities should be located where operators are free from disturbance.2 Eddy Current Testing. National Accreditation Board for Testing and Calibration Laboratories Doc. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. Proper recording media like strip chart. bobbin. Adequate numbers of variety of test coils (encircling.3. 3.4 Ultrasonic Testing. Facilities for processing films consistently at a high level of quality must be available. probe or flat coils) should be available. Procedures must be followed which ensure that the processing remains satisfactory. tape recording or PC base data acquisition systems should be available. Eddy current testing instrument of adequate sensitivity over wide range of frequency must be available. sniffer probes. vessels etc. ultrasonic leak detector. of adequate sensitivity must be available. must be available.. should be available for sniffer test. adequate spares like maintenance tool kit containing set of ‘0’ rings. Records of field jobs must include evidence of checking of records and reports of senior staff during supervisory visits. each officer being aware of both the extent and limitations of his own responsibility.2008 Amend No: 00 Amend Date: -Page No: 8/ 20 . capillary leak calibrator etc. There must be clearly defined and recognisable lines of authority and responsibility within the organisation. filaments.03. mechanical & diffusion pump oil etc. should be available.4.. 3. spray probes. All field work must be under effective technical control. heat exchangers. A copy of the written/ documented test procedure must be available to the staff performing the test.1 Test Procedure When the code or standard for a project specifies a test procedure. discharge gauge liner tubes.4 Operating a Testing Service Sound management is essential if a testing service is to operate at a satisfactory standard. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. Particular attention should be given to the following aspects of management.5 Leak Testing Leak testing instruments like helium leak detector. Helium gas cylinders. standard leak calibrator. In case of helium leak detector.fittings etc. halogen leak detector. The detector must have a stable & fast electronic meter response when calibrated with a calibrator & tested over many hours of testing. bubble emission test set up etc. National Accreditation Board for Testing and Calibration Laboratories Doc. Adequate test space area should be available for testing long jobs like tubes. When the test procedure is not specified the officer incharge of the job must select an appropriate documented/ written test procedure. liquid nitrogen etc. pressurise or drop test set up.3. Calibrated pressure gauges. tube. that procedure must be followed exactly. 3.3. Job records must include instructions for each job. “interim” and “final” reports. Each testing service must have a routine arrangement for keeping codes and standards upto date.destructive testing examinations. 3. If required radiographs may be taken by the client and there should be record/ signature to that effect and if the client is not taking them. including radiographs.03. Radiographs must remain the property of the testing service. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. in some circumstances. the test procedure. Signed copies of test documents and all related records must be retained for not less than five years after completion of the work involved. 3. It must contain sufficient information on each test to permit a repeat performance.4. When record such as worksheets and viewing sheets are checked. Its reference library should include recommended particles.4. National Accreditation Board for Testing and Calibration Laboratories Doc.Any variation from a standard test procedure must be noted and reported in test documents.2 Records System An adequate records system is essential.3 Interim and Final Reports There are many circumstances in which clients must have an immediate report of results of non. This has led to the practice of issuing. these should be kept for 5 years. must be traceable to the article under test. they must be signed or initialed by the checking officer as an indication that this has been carried out. Irrevocable decisions are frequently made on the basis of these immediate reports. All the test records must be kept confidential and they may be accessible to the competent authority. and client only if needed. all test data and the test results must be recorded. codes for identification of indications and a selection of reference books.2008 Amend No: 00 Amend Date: -Page No: 9/ 20 . All records. Identification of each test article. the client’s instructions. 3. lift.5.5. genuine defect signals should not be missed. 3. baffles/ support plates etc.viewing of interpretation of radiographs on each assignment is essential. 3.destructive indications. must not be taken as defect indications.4 Vision It is the responsibility of the testing authority to ensure adequacy of the natural or corrected vision of the staff responsible for viewing non.5. National Accreditation Board for Testing and Calibration Laboratories Doc.5 Interpretation of Test Data Thorough training of all staff engaged in interpretation of test data is essential.1 Magnetic Particle and Penetrant Testing Operators using surface methods must be fully competent to interpret indications for the specific work on which they are engaged. The signatory must participate personally in the viewing. Regular checking of the competence of each operator is essential. The controlling officer shall have the authority to give final interpretation.When a testing service is required to issue interim and final reports.4. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28.viewed will depend on the nature of the work and the experience of the interpreter.2 Eddy Current Testing Operators using Eddy Current test instrumentation must be well trained & preferably certified by ISNT/ ASNT. vibration. 3. The percentage to be check.off.3 Radiographical Testing Check Viewing Systematic check. 3.03.2008 Amend No: 00 Amend Date: -Page No: 10/ 20 . Each interpreter must have all available information on the article under examination. The signals due to spurious reasons like – noise. the NABL endorsement must not be applied to the final report unless the corresponding interim reports have also been endorsed. On the other hand. iii) Standards shall be available which specify the radio. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. Complex one.graphic technique used and the quality of the radiographs produced shall comply with the requirements of the standards. The sensitivity achieved in each exposure outside the specified range. National Accreditation Board for Testing and Calibration Laboratories Doc. it is sufficient to note this in the report. The interpretation report shall identify the laboratory which produced the radiographs. must be recorded and reported. together with appropriate experience. 3. iv) v) Both laboratories shall have adequate radiographic viewing equipment and film density standards.Separate accreditation can be given for either the taking and processing of radiographs or the interpretation of radiographs on the following conditions: i) ii) An endorsed reports covering the taking and processing of the radiographs shall be available. and shall note the serial numbers of the endorsed reports covering the taking and processing of the radiographs.2008 Amend No: 00 Amend Date: -Page No: 11/ 20 . but if all exposures are within the specified range.5. The interpreter shall be provided with a copy of the job record covering the taking and processing. Sensitivity Compliance or otherwise each of radiograph exposure with sensitivity requirements must be recorded.off ultrasonic examinations may be conducted only by people with ISNT/ ASNT ultrasonic qualification or equivalent qualifications. and shall have the ability to assess the quality of the radiographs.graphic technique and the product quality requirements. vi) Radiographs shall remain the property of the laboratory responsible for taking and processing. The radio.4 Ultrasonic Testing The quality of an ultrasonic examination depends largely on the knowledge and experience of the person performing the work.03. off” covers most ultrasonic examinations.The expression “complex or one. 3. The only exceptions are ultrasonic thickness measurements and routine ultrasonic flaws detections made in circumstances in which it is possible for the controlling officer to define the test procedure in detail and to specify the circumstances in which the operator must seek assistance or advice.03.2008 Amend No: 00 Amend Date: -Page No: 12/ 20 . National Accreditation Board for Testing and Calibration Laboratories Doc. The interpretation of test result data will be carried out by experienced and preferably certified officer. ultrasonic leak detector will be employed.5 Leak Testing Only experienced operator well versed in operating the leak detectors like helium leak detector.5. halogen leak detector. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. ii) Setting a level of discrimination and measurement uncertainty that is adequate to give confidence in the examinations and acceptances/ rejections concerned. temper and nominal dimensions as the product to be tested. The dimensions of holes or notches and the thickness of the calibration piece must be certified by the manufacturer or established in-house by means. 4. through traceable calibrations (or by other methods of measurement correlation.2. where the concept of traceability is not directly applicable) that equipment is maintained so as to provide the appropriate discrimination and measurement uncertainty.4 Specific Criteria This section gives the specific details applicable for the tests to be conducted by the laboratories seeking accreditation. For specilalised applications. within the level of discrimination and measurement uncertainty claimed. which are traceable to National Standards. National Accreditation Board for Testing and Calibration Laboratories Doc.03.destructive testing necessitates various controls on the measurements or examination process. reference standards shall be prepared from material of the same alloy. v) Meeting the calibration and traceability requirement of any standard or other relevant specification. iii) Ensuring. 4.2 For portable equipment. such as tube testing.2008 Amend No: 00 Amend Date: -Page No: 13/ 20 .2 Eddy Current Testing 4. 4.2. as listed below: i) Specifying the physical characteristic to be determined or examined. a reference ‘sensitivity block’ dimensionally certified by the manufacturer will normally be used for checking the response of the equipment to known flaws. iv) Taking any other necessary steps to ensure that test results are reproducible. and any acceptance/ rejection criteria.1 An ongoing record of the performance of eddy current test sets must be maintained.1 Control of Non Destructive Test Systems Assuring confidence in the results of non. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. a suitable leak testing method (from amongst many) will be selected.5 Reference test standards shall be carefully maintained and properly identified.gross leak testing & fine leak testing. The calibration of reference measuring equipment used for in. like.4. 4.nitrogen should be available.4. ASTM. 4.4.4. 4. 4. 4. heat treatment conditions and nominal dimensions as the materials or products to be tested. 4. The personnel carrying out the test must preferably be certified.03.2 Leak testing should preferably be carried out in two ranges.2. pressure gauges. halogen leak test etc. liquid.4 The acceptance criteria giving the minimum acceptable leak rate in the job with the particular technique of leak test should be clearly spelt out in the specification.3 Where eddy current examination is used for sorting of materials or products.house dimensional verification shall be recorded.2008 Amend No: 00 Amend Date: -Page No: 14/ 20 . No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28.4.5 Accessories of helium leak detection. and ASME etc.1 The equipment used for leak testing shall have adequate sensitivity to detect the leaks as specified in the work order or the specification.3 Any leak test must be carried out as per some standard code like BIS.4. Depending on the leak tightness required in the job. reference test standards shall be prepared from materials of the same alloy(s). pressure change test/ bubble emission test and for fine leak test are. National Accreditation Board for Testing and Calibration Laboratories Doc.helium leak test. 4.2.4 Leak Testing 4.4 4. Examples of gross leak test are.3 Emerging Areas Testing The guidelines for accreditation of tests under this category will be provided on case by case basis as applications are received.sniffer.2. spray probe. In case of aerosols.2 When using fluorescent inks/ powders.6. the intensity of black light at the test surface should be checked as frequently as necessary to monitor possible deterioration of the illumination. dusty or other contaminating environments are involved.2008 Amend No: 00 Amend Date: -Page No: 15/ 20 . These checks will require the use of a white light meter. Where grimy.03. provisions of which are applicable should be mentioned.4. checking should be carried out each time the equipment is used.1 The liquid penetrant shall be suitable for the application for which it is intended. 4. 4. certificate or technical leaflet or may be included in the labelling of the product. a representative sample from each batch shall be tested. National Accreditation Board for Testing and Calibration Laboratories Doc. but this may be in the form of a letter.4 The ambient white light level should be checked at least once every three months where illumination is controlled on a long term basis and should be checked from time from which the equipment is used in situations where illumination may be variable from test to test (e. The relevant national/ international standard. This will require the use of black light meter complying with national standards. in day light conditions).1 The solids content of magnetic inks must be checked as specified in National/ International standards.5 Magnetic Particle Testing 4.5. A specific statement by the manufacturer is required.3 Black light meters and ammeter shall be calibrated at twelve monthly intervals by a manufacturer or appropriate services organisation. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. 4.6 Liquid Penetrant Testing 4.5.g.5. 4.5. 6 Where the temperature of a bath or a test is of extreme values. 4. quoted in procedures.5 For both types of meter. 4. in daylight conditions).6.3 In non-fluorescent i.2 In fluorescent penetrant examination areas.6. 4. The checks will require the use of a white light meter. the intensity of black light illumination at the inspection surface should be checked as frequently as necessary to monitor possible deterioration of the illumination. 4.2 Where the radiography is being performed in accordance with an agreed Standard or Code.6. Where grimy.7.4. checking should be carried out each time the equipment is used. the calibrations must be evidenced by certificates from the appropriate service organisation. National Accreditation Board for Testing and Calibration Laboratories Doc.7 The laboratory should preferably have standard calibration blocks.7 Radiographic Testing 4.6.e. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. dusty or other contaminating environments are involved. 4.7.6. the intensity of illumination at the inspection surface should be checked at least once every three months where illumination is controlled on long term basis. the temperature shall be monitored using a national standard stamped thermometer.2008 Amend No: 00 Amend Date: -Page No: 16/ 20 . colour contrast penetrant examination areas. IQIs will be manufactured to meet the requirements of national standards. 4.g.03..1 The sensitivity of a radiograph shall be established by means of an IQI or penetrameter.7. or other relevant specifications. the requirements of the Standard or Code with respect to the type and location of the IQI or penetrameter shall be strictly observed. appropriate to the material and thickness.6. in situations where illumination may be variable from test to test (e.3 The density of radiographs shall be ascertained using densitometers or film density strips. It should be checked each time the equipment is used. 4.4 White light meters shall be calibrated at twelve monthly or shorter intervals if appropriate by a manufacturer or appropriate service organisation. 4. 7 Film density strips used. 4. Hand-held densitometers must be checked each time they are used as part of the setting up procedure against the level of background illumination on which they will be used.10 The overall effectiveness of radiographic processing carried out by the laboratory shall be monitored every three months. by comparison of results of tests on standard test pieces. or more frequently according to the throughout of work.03. for the lifetime of the set).12 A formal procedure for determining and monitoring the focal characteristics of an X-ray set is provided by the pin. shall be taken out of use and destroyed. or which have been subject to undue wear.g.8 Film density strips are subject to discolouring or fading and must be carefully maintained and stored.4 Densitometer shall be checked and linearity should be calibrated against a reference density strip. as comparators will have the density of each step ascertained using a calibrated and certified densitometer and recorded either directly onto the film or onto a card strip permanently attached to the film.7.7. by comparison of results of tests on standard test pieces.7. National Accreditation Board for Testing and Calibration Laboratories Doc. Linear calibration shall be checked every twelve months and recorded. The laboratory shall monitor any significant changes in these focal characteristics. The accuracy of working thermometers shall be checked. 4.4.5 Reference film density strips shall be uniquely identified and traceable by certificate to a National Standard of Measurement. 4.9 Where appropriate.6 Reference film density strips shall carry a manufacture’s certificate less than five years old. once per year. The date of first calibration shall be recorded on the strip.7.7.7. 4. carried out over an appropriate period of time (e.7.7. All film density strips which are more than five year old. 4.hole method (ASTM specifications).7. 4. 4. thermometers must be used to check chemical process or air dryer temperatures.11 The focal characteristics of an X-ray set are critical to the definition and sensitivity of radiographs. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. 4.2008 Amend No: 00 Amend Date: -Page No: 17/ 20 . 8 Ultrasonic Testing 4. each time the equipment is used.5 Ultrasonic equipment sets shall be verified in accordance with National Standards daily.8.03.house dimensional calibration shall be evidenced by a certificate.8.8. 4. The blocks shall be manufactured in accordance with the appropriate specification and conformance with the requirements shall be evidenced by a manufacturer’s certificate.8.4. 4.2008 Amend No: 00 Amend Date: -Page No: 18/ 20 . or each time the equipment is used including: Visual checks for damage Linearity of time base Calibration of time base Linearity of equipment gain National Accreditation Board for Testing and Calibration Laboratories Doc.8. 4. 4.7.4 Working standard calibration blocks shall be verified at intervals not exceeding two years as follows: Visual Examination for deterioration such as corrosion or mechanical damage.7. The calibration of reference measuring equipment used for in. using a calibrated ultrasonic test set Attenuation check Radio and other dimensional checks. By comparison with corresponding Master Calibration Block.2 One set of calibration blocks shall be designated as master blocks and shall be dimensionally calibrated with traceability established to National Standards at intervals not exceeding five years. 4.1 Ultrasonic calibration blocks should be used to set up the assembly of probe and sensory electronics. which must be certified by the manufacturers of the isotope.14 Safety aspects are to be adhered to as required by the stipulation of NABL Specific Criteria for Radiological Testing. 4.3 Dimensional calibration shall be evidenced by a certificate.13 Each isotope used shall be accompanied by a decay chart for that isotope together with an official record of dimensions. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. below surface. The calibration of reference measuring equipment used for in. ultrasonic thickness measurement and magnetic particle testing. including: Linearity of time base Linearity of amplifier Accuracy of calibrated attenuator 4. the operator/ diver must have signatory approval for these tests if he is responsible.8. 4. for the operation of these tests.house calibration shall be traceable to national standards and. must be evidenced by an official certificate. where practical.8 Calibrated must be evidenced by a certificate provided by the manufacturer of the equipment or an established service agency. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28. the above requirements may be waived off provided the diver conducting the tests holds an appropriate underwater NDT qualification.8.9 Underwater Non-Destructive Testing The following specific requirements apply: i) In general.2008 Amend No: 00 Amend Date: -Page No: 19/ 20 . 4. ii) In cases where these examinations are controlled and monitored on the surface by another NDT operator holding signatory approval for the relevant tests.6 The performance characteristics of ultrasonic probes shall be checked in accordance with national standards as appropriate: Probe index Probe beam angle Probe beam alignment Frequency of checking may depend on volume of work. for underwater ultrasonic examination. National Accreditation Board for Testing and Calibration Laboratories Doc.8.4.03.7 Ultrasonic flaw detectors shall be calibrated at intervals not exceeding twelve months in accordance with national standards and as appropriate. National Accreditation Board for Testing and Calibration Laboratories Doc. then registration will be considered only if the laboratory can demonstrate both adequate technical control over testing and expertise in the areas of test requested. Additionally. v) Where conditions (i) to (iv) above do not apply. the officers exercising technical control over ultrasonic flaw examinations must be experienced in this area and have underwater NDT experience.2008 Amend No: 00 Amend Date: -Page No: 20/ 20 . iv) The operators nominated as exercising technical control must satisfy the criteria detailed in section 3.1 of this document.03. No: NABL 108 Issue No: 02 Specific Criteria for Non-Destructive Testing Laboratories Issue Date: 28.iii) It is the responsibility of the NDT testing service to ensure that all divers supplied to them by diving companies satisfy the criteria set out in (i) or (ii) above. Satsang Vihar Marg New Mehrauli Road New Delhi – 110 067 Tel. NISCAIR 14.: 91-11 26529718 – 20.National Accreditation Board for Testing and Calibration Laboratories 3rd Floor. 26526864 Fax: 91-11 26529716 Website: www.nabl-india.org .