BS/EN 16910-1-2018 pdf download.Railway applications – Rolling stock – Requirements for non-destructive testing on running gear in railway maintenance Part 1: Wheelsets.
4.1 General
NDT personnel shall have knowledge and skills relevant to the component to which they are inspecting. An example of a typical process is shown in the Informative Annex A.
The organization offering the training, examination and acceptance of experience shall provide evidence of fulfilling the relevant requirements of this standard.
NOTE In practice the evidence is provided by an independent body to the organization. These processes are organized with three levels of competence:
— level 1 personnel: persons with competencies in a specific NDT method that allows to perform the following in accordance with NDT instructions: set up NDT equipment, perform the tests, record and classify the results of the tests according to written criteria, report the results;
— level 2 personnel: persons with competencies in a specific NDT method that allows to deal with the following points:
• choose NDT techniques, tests, equipment, specification and procedures;
• select the NDT technique for the testing method to be used;
• define the limitations of application of the testing method;
• translate NDT codes, standards, specifications and procedures Into NDT Instructions adapted to the actual working conditions;
• set up and verify equipment settings;
• perform and supervise tests;
• interpret and evaluate results according to applicable standards, codes specifications or procedures;
carry out and supervise all tasks at or below Level 2,
• provide guidance for personnel at or below level 2;
• report the results;
— level 3 personnel: persons with competencies that allow to perform and direct NDT operations and validate documents.
In order to work as NDT personnel the person has to follow training and pass an examination. In addition the employer shall authorize the person to operate in accordance with the conditions of paragraph 4.
4.3.2 Specific examination in wheelsets
The specific examination shall include only questions selected from a collection of questions related to wheelsets.
During the specific examination, the candidate shall be required to give answers to at least 20 multiple choice questions, including questions involving calculations, NDT procedures and questions on codes, standards and specifications.
The following topics shall be addressed in the questions:
1) terms and definitions;
2) purpose of NDT;
3) typical equipment and techniques;
4) typical defects for wheelsets for manufacturing as well as in service,
5) typical procedures.
The collection of questions shall be validated by an independent body.
4.3.3 Practical examination in wheelsets
The practical examination shall involve applying the test to prescribed wheelset specimens, recording (and, for level 2 candidates, interpreting) the resulting information to the degree required, and reporting the results in the required format.
The training specimen shall not be used during practical examination.
Each specimen shall be uniquely identified and have a master report which includes all of the equipment settings used to detect specified discontinuities contained within the specimen, which shall be uniquely identified by an appropriate permanent marking to ensure that it is completely traceable. Such marking shall not interfere with the practical testing or inspection of the specimen and shall, wherever practicable, be concealed from the candidate while the specimen is being used for examination. The master report shall be compiled based upon at least two independent tests, and shall be validated by level 3 wheelset NDT personnel, for use in grading examinations. The independent test reports from which the master report is compiled shall be retained as records.
The practical examination shall be performed with:
— tests and procedures typical for the candidates working site;
— defects typical to those detected during maintenance. They should be natural or artificially created.
The candidate is required to demonstrate their ability to:
— perform tests on specified specimen;
— complete test reports.
The level 1 candidate shall follow the NOT instruction(s) provided by the examiner.
The level 2 candidate shall select the NOT technique and determine the operating conditions related to a given code, standard and specification.
The time allowed for the examination depends on the number of specimens and on their complexity. The average time allowed shall be defined by an independent body. The recommended maximum time allowed for each area or volume tested:
— forlevell:2h;
— forlevel2:3h.
Level 2 candidates shall draft one written instruction for Level 1 NDT personnel. This instruction shall be applicable to a wheelset component.
The collection of specimens and practical questions shall be validated by an independent body. The candidate shall be evaluated on a minimum of 2 wheelset specimens for the practical examination of levels 1 and 2.
4.3.4 Grading of the level 1 and level 2 competencles
The general, specific and practical examinations shall be graded separately. An examiner shall be responsible for the grading of the examinations by comparing with model answers.
The grading of the practical examination shall be based on items I to 4 in TahIe.BS/EN 16910-1-2018 pdf download.