ASNT SNT-TC-1A-2011 PDF

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Exclusive of those papers that are a work of the federal government and not subject to copyright. ASNT is not responsible for the authenticity or accuracy of information herein. Published opinions and statements do not necessarily reflect the opinion of ASNT.

Products or services that are advertised or mentioned do not carry the endorsement or recommendation of ASAT. No part of this publication may be reproduced or transmitted in any form, by means electronic or mechanical including photocopying, recording or otherwise, without the expressed prior written permission of The American Society for Nondestructive Testing, Inc.

Materials Evaluation. Printed in the United States of America. Supplementary documents include question and answer lists, which may be used in composing examinations for nondestructive testing personnel.

This recommended practice is not intended to be used as a strict specification. It is recognized, however, that contracts require programs, which meet the intent of this document. The verb "should" has been used throughout this document to emphasize the recommendation presented herein. The vertical lines in the margins of this document indicate that information in the text has been modified in some way.

Matthew Patience Bill Plumstead, Jr. Bill Plumstead, Sr. This Recommended Practice has been prepared to establish guidelines for the qualification and certification of NDT personnel whose specific jobs require appropriate knowledge of the technical principles underlying the nondestructive tests they perform, witness, monitor, or evaluate. In developing a written practice as required in Section 5 , the employer should review the detailed recommendations presented herein and modify them, as necessary, to meet particular needs.

Such modification may alter but shall not eliminate basic provisions of the program such as training, experience, testing and recertification. Supporting technical rationale for modification of detailed recommendations should be provided in an Annex to the written practice.

Definitions 2. Grading units are unflawed or flawed and the percentage of flawedlunflawed grading units required should be approved by the NDT Level Throughout this document the term NDT applies equally to the NDT inspection methods used for material inspection, flaw detection or predictive maintenance PdM applications. The employer may subdivide these levels for situations where additional levels are deemed necessary for specific skills and responsibilities. A trainee should work with a certified individual.

The trainee should not independently conduct, interpret, evaluate, or report the results of any NDT test. An NDT Level I individual should be qualified to properly perform specific calibrations, specific NDT, and specific evaluations for acceptance or rejection determinations according to written instructions and to record results. An NDT Level I1 individual should be qualified to set up and calibrate equipment and to interpret and evaluate results with respect to applicable codes, standards, and specifications.

The NDT Level I1 should be thoroughly familiar with the scope and limitations of the methods for which qualified and should exercise assigned responsibility for on-the-job training and guidance of trainees and NDT Level I personnel. An NDT Level I11 individual should be capable of developing, qualifying, and approving procedures, establishing and approving techniques, interpreting codes, standards, specifications, and procedures; and designating the particular NDT methods, techniques, and procedures to be used.

The NDT Level I11 should be responsible for the NDT operations for which qualified and assigned and should be capable of interpreting and evaluating results in terms of existing codes, standards, and specifications. The NDT Level I11 should have sufficient practical background in applicable materials, fabrication, and product technology to establish techniques and to assist in establishing acceptance criteria when none are otherwise available.

Written Practice 5. Documentation of prior certification may be used by an employer as evidence of qualification for comparable levels of certification. Table 6. Limited certifications should apply to individuals who do not meet the full training and experience of Table 6. Limited certifications issued in any method should be approved by the NDT Level and documented in the certification records. The organized training may include instructor led training, self-study, virtual instructor led training, computer based training or web based training.

Computer based training and web based training should track hours and content of training with student examinations in accordance with 7. The sufficiently organized training shall be such as to ensure the student is thoroughly familiar with the principles and practices of the specified NDT method related to the level of certification desired and applicable to the processes to be used and the products to be tested.

A11 training programs should be approved by the responsible NDT Level Examinations 8. A qualified representative of the employer may perform the actual administration and grading of NDT Level I11 examinations specified in 8. For NDT Level I11 personnel, the composite grade should be determined by simple averaging of the results of the basic, method, and specific examinations described below.

Vision Examinations 8. The examination should ensure natural or corrected near-distance acuity in at least one eye such that the applicant is capable of reading a minimum of Jaeger Number 2 or equivalent type and size letter at the distance designated on the chart but not less than 12 inches The ability to perceive an Ortho-Rater minimum of 8 or similar test pattern is also acceptable. This should be administered annually. The examination should demonstrate the capability of distinguishing and differentiating contrast among colors or shades of gray used in the method as determined by the employer.

This should be conducted upon initial certification and at five-year intervals thereafter. The candidate should detect all discontinuities and conditions specified by the NDT Level Proficiency should be demonstrated in selecting and performing the applicable NDT technique within the method and interpreting and evaluating the results on one or more specimens or machine problems approved by the NDT Level Note: While it is normal to score the practical on a percentile basis, practical examinations should contain check points that failure to successfully complete will result in failure of the examination.

Sample questions for general examinations are presented in the separate question booklets that can be obtained from ASNT Headquarters. These questions are intended as examples only and should not be used verbatim for qualification examinations. Alternating Current Field Measurement 2. Eddy Current 3.

Profilometry 2. HolographyIShearography Leak Testing 1. Bubble Test 2. Pressure Change Measurement 3. Halogen Diode Leak Test 4. Radiographic Testing 2. Computed Radiography Testing 3. Computed Tomography Testing 4. Questions utilizing such reference materials should require an understanding of the information rather than merely locating the appropriate answer.

Flawed samples used for practical examinations should be representative of the components andlor configurations that the candidates would be testing under this endorsement and approved by the NDT Level The minimum number of questions that should be given is as follows: 8. Reexamination Those failing to attain the required grades should wait at least thirty 30 days or receive suitable additional training as determined by the NDT Level I11 before reexamination.

In such instances, the responsibility of certification of the employees should be retained by the employer. The practical examination should follow the format and guidelines described in section 8. Certifications expire on the last day of the month of expiration. I Table 6. Extensive examples of representative questions for degree of difficulty, type, etc. Note: All questions and answers should be referenced to a recognized source.

A qualitative description of the sustained signal level produced by rapidly occurring acoustic emission events is the accepted definition for: a. When detecting impulsive acoustic emission signals on large objects, the peak of the signals normally decreases with increasing distance from the source.

This alteration, dependent on distance, must be explained by: a. The Kaiser effect is: a. What is the medium between an ACFM probe and a metal surface when operating in air? A fatigue crack perpendicular to the induced current will cause the induced current to: a. During an ACFM weld inspection, the measurement of crack depth requires the following information: a.

Level II 1. I 1 1 the remote field zone with distance the magnetic field distribution decays: a. The most a. What are the key wave field properties for GPR? What are they? The ratio of the largest receivable signal and the minimal detectable signal is called the: a , system detection factor. What is gating? A method of expanding the depth of penetration by viewing only a portion of the total signal.

The ability to control the shape of the transmitted signal. A method of reducing the signal bandwidth. Timing the transmit and receiver signals to avoid detrimental effects from strong signals. Why is dewowing important? It acts as a biomonitor. It helps to produce a stable image of unstable soils. It allows positive and negative color filling to be used in the recorded trace. It is generally used to improve section resolution and create more spatial realistics.

The velocity of guided waves depends on: a. Guided wave testing of long lengths of pipe: a. How are guided wave testing results typically calibrated: a.

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