1、NAVSEA Technical Publication EDDY CURRENT INSPECTION OF HEAT EXCHANGER TUBING ON SHIPS OF THE UNITED STATES NAVY PUBLISHED BY DIRECTION OF COMMANDER, NAVAL SEA SYSTEMS COMMAND Revision 1 22 MAY 2002 I IlIll IlIlIl Ill11 IlIll IlIll 11l11ll IlIll Ill IlIll IlIll IlIll IlIll IlIll IlIll IlIl IlIll IlI
2、l *O91 OLP7314800* Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-T9074-AT-GlB-0 10/2032 NAVSEA TECHNICAL PUBLICATION CERTIFICATION SHEET 1 of1 Certifi
3、cation Applies to: New Document 0 Revision Change 0 Applicable TMINSPub. No. T9074-AT-GIB-010/2032 Publication Date (Mo, Da, Yr) MAY 22,2002 Title: EDDY CURRENT INSPECTION OF HEAT EXCHANGER TUBING ON SHIPS OF THE UNITED STATES NAVY CHANGES AND REVISIONS: Purpose: This publication is revision 1 of th
4、e original. NAVSEA procedure ECTIP- 1 is now included as appendix B. Also, several technical changes were made including a caution on data trending, an additional requirement for setting the phase rotation for the calibration setup, a relaxation in the calibration standard wall thickness tolerance s
5、pecification, and deletion of the requirement to report ET data from the calibration standard pulls on the data disk report form. MDER/ACN Numbers Incorporated: N/A Zontinue on reverse side or addpages as needed. CERTIFICATION STATEMENT rhis is to certi that responsible NAVSEA activities have review
6、ed the above identified document For technical adequacy and suitability for the intended use. This form is for internal NAVSEA nanagement use only, and does not imply contractual approval or acceptance of the technical mblication by the Government. Philadelphia, PA 191 11-5094 (215/697-1456) Provide
7、d by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-REVISION NO. O 1 T9074-AT-GIB-010/2032 RECORD OF REVISIONS DATE ENTERED BY 1 May 2000 Original issue 22 May 200
8、2 NAVSEA 05 Rev. 1 i Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Rev. 1 ii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CONTENTS ParaqraDh Paqe 1. 1.1 2. 2.1 2.1.1 2.1.2 2.2 2.3 3. 3.1 3.2 3.3
9、3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 3.20 3.21 3.21.1 3.21.2 3.21.3 3.21.4 3.22 4. 4.1 4.1.1 4.1.2 4.1.3 4.1.4 4.1.5 4.1.6 4.1.6.1 4.1.6.2 4.1.6.3 4.1.6.4 4.1.6.5 4.1.7 4.2 4.2.1 SCOPE 1 General 1 APPLICABLE DOCUMENTS 1 Government documents 1 Specifications, stan
10、dards, and handbooks 1 Other government documents, drawings, and publications . . 1 Non-Government publications 2 Order of precedence 2 DEFINITIONS . 2 Absolute mode 2 Calibration . 2 Calibration standard 2 Coil . 2 Defect 2 Differential mode 2 Fill factor . 3 Gain . 3 Inspection activity 3 Noise 3
11、Obstructed tube . 3 Permeability variation 3 Phaseanalysis 3 Phase angle . 3 Plugged tube . 3 Probe 3 Probe motion or probe wobble 3 Signal mix 3 Signal-to-noise ratio 4 Test and inspection 4 Thinning . 4 General thinning . 4 Localized thinning 4 Non-uniform thinning 4 Uniform thinning . 4 Vector an
12、alyzer . 4 GENERAL REQUIREMENTS 4 Equipment 4 Multi-frequency eddy current instrument 4 Strip chart . 5 Magnetic media storage device 5 Probe puller 5 Probes 5 Calibration standards 5 ASME type calibration standard 6 Thinning standard 6 Tapered area sensitivity standard 6 Slotted standard . 6 Option
13、al discontinuity-free standard 6 Borescope 6 Procedure 6 Procedure qualification 7 . . . . . . . . . . . . . . Rev. 1 iii Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-T9074-AT-GIB-010/2032 4.3 5 . 5.1 5.1.1 5.1.2 5.1.3 5.1.4 5.2 5.2.1 5.2.2 5.2.2.
14、1 5.2.2.1.1 5.2.2.1.2 5.2.2.2 5.2.2.3 5.2.3 5.2.4 5.2.5 5.3 5.3.1 5.3.2 5.3.3 5.3.4 5.3.5 5.3.6 5.4 5.4.1 5.4.1.1 5.4.1.2 5.4.1.3 5.4.1.4 5.4.1.5 5.5 6 . 6.1 6.2 6.3 Fiqure Personnel 7 DETAILED REQUIREMENTS 7 Heat exchanger inspection preparation 7 Heat exchanger design review 7 Tubecleaning 7 Tube
15、identification 7 Extent of inspection 8 Eddy current inspection procedure 8 Equipment 8 Calibration techniques 8 Differential mode probe calibration 8 90-10 CuNi material 8 Absolute mode probe calibration . 11 Special probe calibration for crack detection 11 Recalibration 12 Noise interference 12 Sp
16、ecial requirements for titanium tubes . 12 Inspection techniques 12 Detection of local volumetric defects 12 Detection of thinning 12 Detection of cracks . 13 Detection of denting . 13 Evaluation of permeability variations 13 Obstructed tubes . 13 Reporting and record requirements 13 Reporting 13 In
17、spection summary cover letter . 13 Detailed test parameters . 14 Detailed inspection results . 14 Tube sheet diagrams . 14 Metallographic or metallurgical reports . 15 Maintenance of inspection records 15 NOTES 15 Intendeduse . 15 IssueofDODISS . 15 Subject term (key word) listing . 15 . . . . . . A
18、ll materials except 90-10 CuNi material 9 FIGURES Paqe 1 . ASME type calibration standard with typical signal presentation . . 16 2 . 360-degree machined ring standard . 17 3 . Milled flat thinning standard . 18 4 . Tapered area sensitivity standard . 19 5 . Slotted standard 20 6 . Typical defect ev
19、aluation curve for phase angle analysis 21 7 . Typical absolute mode calibration curve for wall thinning . 22 Rev . 1 iv Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Armendix APPENDICES A. Format for reporting eddy current inspection data . . . .
20、. . . B. Eddy Current Inspection Supplemental Requirements . . . . . . . Pacre 23 29 Rev. 1 V Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-1. SCOPE 1
21、.1 General. This standard provides the minimum requirements (unless otherwise specified) to conduct the eddy current inspection of nonferromagnetic tubing in heat exchangers on Navy ships. In this document, the term “heat exchanger“ applies to condensers, reboilers, etc. Minimum requirements are spe
22、cified for inspection personnel, equipment, procedures, evaluation, and reporting of results. 1.2 Data Trendinq. A review of comparative inspections of the same heat exchanger by different inspection activities has concluded that there is a relatively large amount of inspection variability in the re
23、sults. Caution should be used when using the data generated with the procedures in this document for trending of the tube degradation. A comprehensive, statistical study of inspection consistency would be required to quantify the inspection variability. 2. APPLICABLE DOCUMENTS 2.1 Government documen
24、ts. 2.1.1 Specifications. standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index of Specif
25、ications and Standards (DODISS) and supplement thereto, cited in the solicitation (see 6.2) . STANDARD MIL I TARY NAVSEA Technical Publication T9074-AS-GIB-010/271 - Requirements for Nondestructive Testing Methods. (Unless otherwise indicated, copies of federal and military specifications, standards
26、, and handbooks are available from the Standardization Documents Order Desk, Building 4D, 700 Robbins Avenue, Philadelphia, PA 19111-5094.) 2.1.2 Other sovernment documents. drawinss. and publications. The following other government documents, drawings, and publications form a part of this document
27、to the extent specified herein. Unless otherwise specified, the issues are those cited in the solicitation. PUBLICATION NAVAL SEA SYSTEMS COMMAND (NAVSEA) S9086-HY-STM-OOO/CH-254 - Condensers, Heat Exchangers, and Air Ejectors (Copies of standards and publications required by contractors in connecti
28、on with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting officer.) Rev. 1 1 22 MAY 2002 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.2 Non-Government Dublications. The following do
29、cuments form a part of this document to the extent specified herein. Unless otherwise specified, the issues of the documents which are DOD adopted are those listed in the issue of the DODISS cited in the solicitation. Unless otherwise specified, the issues of documents not listed in the DODISS are t
30、he issues of the documents cited in the solicitation (see 6.2). AMERICAN SOCIETY OF MECMICAL ENGINEERS (ASME) Boiler and Pressure Vessel Code, Section V, Article 8. (Application for copies should be addressed to the American Society of Mechanical Engineers, 345 East 47th Street, New York, NY 10017.)
31、 AMERICAN SOCIETY FOR NONDESTRUCTIVE TESTING, INC. (ASNT) SNT-TC-1A - Recommended Practice. (Application for copies should be addressed to the American Society for Nondestructive Testing, Inc., 4153 Arlingate Plaza, Columbus, OH 43228-0513.) 2.3 Order of mecedence. In the event of a conflict between
32、 the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained. 3. DEFINITIONS 3.1 Absolute mode. Mode of operating an eddy current pro
33、be where signal response is based on the total detected electromagnetic properties of one section of the tube (and adjacent structures and conductive deposits). The absolute mode is sensitive to shallow or gradual wall loss, support structures and conductive deposits. 3.2 Calibration. Calibration is
34、 the verification of proper equipment response against a known standard. 3.3 Calibration standard. Representative tube with prefabricated defects used to standardize instrument Set-up. 3.4 Coil. Electric coil in an eddy current probe which induces electromagnetic current in the inspected part and de
35、tects the parts electromagnetic response. 3.5 Defect. Defect is a discontinuity (e.g., wall loss, pit, or crack) whose size, shape, orientation, location, or properties makes it detrimental to the useful service of the part in which it occurs or which exceeds the acceptance criteria for a given desi
36、gn. 3.6 Differential mode. Mode of operating an eddy current probe in which adjacent coils are electrically connected in series opposition, so that electromagnetic conditions not common to both tube regions tested simultaneously by the opposed coils will imbalance the system and thereby yield an ind
37、ication. The differential mode is sensitive to abrupt discontinuities and usually provides more reliable defect depth estimates. Rev. 1 2 22 MAY 2002 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.7 Fill factor. Fill factor is a measure of the ele
38、ctromagnetic coupling between the coil and the test object. It is the square of the ratio of the coil diameter to the bore diameter for internal probes. 3.8 Gain. Gain is the amplification level setting or the receiving circuit in an instrument. instrument gain is usually set to normalize response s
39、ignal amplitude using a calibration standard. 3.9 InsDection activitv. Inspection activity is the organization performing the inspection. Unless otherwise specified by the contract or order, the inspection activity shall be fully responsible for the quality of inspection results and the qualificatio
40、n or certification of individuals conducting inspections. 3.10 Noise. Noise is any undesired signal that tends to interfere with the normal reception or processing of a desired signal. In flaw detection, noise is an undesired response to physical or electromagnetic variables. Nearby welding, arc cut
41、ting, and high speed electrical tools can cause unacceptable noise levels during eddy current testing. 3.11 Obstructed tube. Obstructed tube is a tube which contains a dent, debris, scale, or other condition which prevents the probe from being inserted the full length of the tube. 3.12 Permeabilitv
42、variation. Defect-like signal not caused by a defect, but by local variation in a parts electromagnetic material properties (non-geometric) . These variations can normally be overcome using magnetic bias probes. 3.13 Phase analvsis. Phase analysis is an instrumentation technique which discriminates
43、between variables in the test part by the different phase angle changes which these conditions produce in the test signal. For differential mode inspections, phase analysis is used to estimate defect through-wall extent and distinguish defects from other signal sources (e.g., support structures and
44、conductive deposits). 3.14 Phase ancrle. Phase angle is the angular equivalent of the time displacement between corresponding points on two sine waves of the same frequency. In eddy current testing, phase angle is the angle on the CRT (measured clockwise) from the left horizontal to the eddy current
45、 signal interest. of 3.15 Plussed tube. Plugged tubes (temporary, permanent) are described in document 2.1.2 (NSTM254) . 3.16 Probe. Probe is an eddy current sensor or use in a tube. 3.17 Probe motion or Drobe wobble. Lateral probe motion in the tube. This produces noise or signal variations not nec
46、essarily related to any defect. Probe motion should be minimized since signal variations interfere with sizing. 3.18 Sisnal mix. Signal mix is the elimination or suppression of undesirable signals; for example, those signals caused by conditions such as tube support plates, conductive deposits, and
47、inside diameter (ID) variations Rev. 1 3 22 MAY 2002 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-T9074-AT-GIB-010/2032 (pilgering). Signal mixing allows mixing or subtraction of eddy current signals to enhance the signal-to-noise ratio. 3.19 Sisn
48、al-to-noise ratio. Signal-to-noise ratio is the ratio of values of signal (response containing information) to that of noise (response containing no information). In general, the signal-to-noise ratio is the ratio of the vertical component of the signal of interest to the vertical component of the n
49、oise. 3.20 Test and inspection. The terms T1testl and “inspection1 are used interchangeably and refer to performance of specific procedures and applications of acceptance criteria as required. 3.21 Thinninq. 3.21.1 General thinninq. Wall loss in a tube, generally occurring gradually over several inches or more axial
