Eddy Current USA
Method (1.0-2.2a.4a)

1.0 Purpose
1.1 Scope
2.0 General
2.1 Equipment
2.1a Coils/Probes
2.1b Reference Specimen (Standard)
2.1b.1 100% Thru-Wall Hole
2.1b.2 O.D. Notches
2.1b.3 I.D. Groove
2.1b.4 Discontinuity Depty
2.1b.5 Discontinuity Spacing
2.1c Signaling Instrument
2.1d Data Capturing
2.2 Personnel
2.2a Qualifications
2.2a.1 Trainee
2.2a.1a Certification
2.2a.2 Level I
2.2a.2a Certification
2.2a.3 Level II
2.2a.3a Certification
2.2a.4 Level III
2.2a.4a Certification

1.0 Purpose

Eddy Current inspection is a method of Non-Destructive Testing (NDT) used to provide a basis of material and component data in order to establish an understanding of premature and/or preventative conditions that affect reliability and operation costs. (Return to Top)

1.1 Scope

Eddy Current USA, Inc. provides Electromagnetic Testing (ET) on seamless and welded tube copper, copper alloy, and other nonferromagnetic tubular products installed in commercial and industrial heat exchangers and chillers. Unless noted or otherwise specified, testing and examination will encompass 100% of the available tubes. (Return to Top)

2.0 General

All equipment, personnel, and labor necessary for the performance of the Eddy Current testing procedure will be provided by Eddy Current USA, Inc. unless otherwise specified prior to the date of testing. All Equipment and Personnel requirements adhere to the standards specified by ASME sec. V, article 8 and ASNT CP-189-1995. (Return to Top)

2.1 Equipment

Testing Equipment will consist of suitable electronic devices that can energize the testing Coils/Probes with alternating currents at frequencies capable of sensing changes in the electromagnetic properties of the test specimen. Output data produced by the Testing Equipment will be both recorded and processed to a Signaling Instrument for visualization. (Return to Top)

2.1a Coils/Probes

Test Coils and/or Probes will be capable of inducing alternating currents into the test material as well as sensing the changes in electromagnetic characteristics of the material. Test Coils and/or Probes will be selected so as to provide a minimum fill factor of 0.8, with respect to Unity (1.0). Maximum scanning speed of Test Coils and/or Probes shall not exceed a rate of 24 inches per second. (Return to Top)

2.1b Reference Specimen (Standard)

Reference Specimen (Standard) material will be manufactured from a length of tubing in the same manner as the Test Subject; the same nominal size and material type (composition and form) as the tube being examined. This Standard is intended to establish and verify system response in the Signaling Instrument. Standard calibration discontinuities are distinguished as follows: (Return to Top)

2.1b.1 100% Thru-Wall Hole

A single hole drilled through 100% of the wall: a diameter of 0.052 in. (1.32 mm) for 0.750 in. (19 mm) O.D. tubing and smaller, and 0.067 in. (1.70 mm) for larger tubing. (Return to Top)

2.1b.2 O.D. Notches

Four flat bottom holes 0.187 in. (4.8 mm) in diameter, spaced 90 deg. apart in a single plane around the tube circumference, 20% through the tube wall from the O.D.(Return to Top)

2.1b.3 I.D. Groove

A single 0.062 in. (1.6 mm) wide, 360 deg. circumferential groove, 10% through the tube wall from the I.D. (Return to Top)

2.1b.4 Discontinuity Depth

Discontinuities of the Calibration Standard, at their center, will be accurate to within ±20% of the specified depth or ±0.003 in. (±0.08 mm), whichever is smaller. All other dimensions will be accurate to 0.010 in. (0.25 mm). (Return to Top)

2.1b.5 Discontinuity Spacing

All Discontinuities of the Calibration Standard will be spaced in such a way that they are easily distinguishable from one another from each end of the tube. (Return to Top)

2.1c Signaling Instrument

Signaling Instrumentation will be inspected prior to each use and calibrated to the manufacturer specifications, so as to establish uniformity in the test data. (Return to Top)

2.1d Data Capturing

Data Capturing equipment will be inspected prior to each use and setup so as to allow for real-time data acquisition of signaling instrument, site and subject states, and Technician commentary. (Return to Top)

2.2 Personnel

All Personnel of Eddy Current USA, Inc. are certified and qualified in accordance with ASNT CP-189-1995 and ASNT SNT-TC-1A 1996 2nd ed. (Return to Top)

2.2a Qualifications

All Personnel of Eddy Current USA, Inc. will have completed sufficient organized and documented training to become familiar with the principles of the method and practices of the test Technique. This training is conducted in accordance with a course outline provided by an ASNT certified, NDT Level III. Specifics of the training are available upon request. (Return to Top)

2.2a.1 Trainee

Personnel not yet certified to any level are considered a Trainee. Trainees work with a certified person, under the direction of an NDT Level II or NDT Level III and will not independently conduct any Testing or write a report of testing Results. (Return to Top)

2.2a.1a Certification

Not less than thirty (30) days of experience directly under the supervision of a certified person not less than Level II. (Return to Top)

2.2a.2 Level I

Level I Personnel have demonstrated the skills and knowledge to properly perform specific Calibrations, specific Techniques, and, with prior written approval of an NDT Level III, perform specific Evaluations for acceptance or rejection to be Documented in the Report. (Return to Top)

2.2a.2a Certification

Not less than twelve (12) hours of training, sixty-five (65) hours specific to the Procedure, and one-hundred and thirty (130) hours in Non-Destructive Testing (NDT). (Return to Top)

2.2a.3 Level II

Level II Personnel have demonstrated the skills and knowledge to set up and Calibrate Equipment, conduct Testing, Evaluate, and Document data in accordance with the Procedure approved by an NDT Level III. Level II Personnel are thoroughly familiar with the scope and limitations of the Technique to which certified and are capable of directing the work of Trainees and Level I personnel. Level II Personnel are able to Evaluate and Document Testing data. (Return to Top)

2.2a.3a Certification

Not less than forty (40) hours of training, six-hundred (600) hours specific to the Procedure, and twelve-hundred (1200) hours in Non-Destructive Testing (NDT). (Return to Top)

2.2a.4 Level III

Level III Personnel have the skills and knowledge to establish Techniques; interpret codes, standards, and specifications; designate the particular Technique to be used; and to verify the adequacy of Procedures. Level III Personnel are capable of conducting or directing the training and examining of Personnel specific to the method(s) in which they are certified. (Return to Top)

2.2a.4a Certification

A current and valid ASNT NDT Level III certificate specific to the method of Non-Destructive Testing (NDT). (Return to Top)