ASTM E690-2010 8750 Standard Practice for In Situ Electromagnetic (Eddy-Current) Examination of Nonmagnetic Heat Exchanger Tubes《非磁性换热管现场电磁(涡流)检验的标准实施规程》.pdf
《ASTM E690-2010 8750 Standard Practice for In Situ Electromagnetic (Eddy-Current) Examination of Nonmagnetic Heat Exchanger Tubes《非磁性换热管现场电磁(涡流)检验的标准实施规程》.pdf》由会员分享,可在线阅读,更多相关《ASTM E690-2010 8750 Standard Practice for In Situ Electromagnetic (Eddy-Current) Examination of Nonmagnetic Heat Exchanger Tubes《非磁性换热管现场电磁(涡流)检验的标准实施规程》.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E690 10Standard Practice forIn Situ Electromagnetic (Eddy-Current) Examination ofNonmagnetic Heat Exchanger Tubes1This standard is issued under the fixed designation E690; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision
2、, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope*1.1 This practice describes procedures to be followed duringeddy-current examination (using an internal, pr
3、obe-type, coilassembly) of nonmagnetic tubing that has been installed in aheat exchanger. The procedure recognizes both the uniqueproblems of implementing an eddy-current examination ofinstalled tubing, and the indigenous forms of tube-wall dete-rioration which may occur during this type of service.
4、 Thedocument primarily addresses scheduled maintenance inspec-tion of heat exchangers, but can also be used by manufacturersof heat exchangers, either to examine the condition of the tubesafter installation, or to establish baseline data for evaluatingsubsequent performance of the product after expo
5、sure tovarious environmental conditions. The ultimate purpose is thedetection and evaluation of particular types of tube integritydegradation which could result in in-service tube failures.1.2 This practice does not establish acceptance criteria; theymust be specified by the using parties.1.3 This s
6、tandard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.
7、1 ASTM Standards:2E543 Specification for Agencies Performing Nondestruc-tive TestingE1316 Terminology for Nondestructive Examinations2.2 Other Documents:SNT-TC-1A Recommended Practice for Personnel Qualifi-cation and Certification in Nondestructive Testing3ANSI/ASNT-CP-189 ASNT Standard for Qualific
8、ation andCertification of Nondestructive Testing Personnel3NAS-410 NAS Certification and Qualification of Nonde-structive Personnel (Quality Assurance Committee)43. Terminology3.1 Standard terminology relating to electromagnetic ex-amination may be found in Terminology E1316, Section C,Electromagnet
9、ic Testing.4. Summary of Practice4.1 The examination is performed by passing an eddy-current probe through each tube. These probes are energizedwith alternating currents at one or more frequencies. Theelectrical impedance of the probe is modified by the proximityof the tube, the tube dimensions, ele
10、ctrical conductivity,magnetic permeability, and metallurgical or mechanical dis-continuities in the tube. During passage through the tube,changes in electromagnetic response caused by these variablesin the tube produce electrical signals which are processed so asto produce an appropriate combination
11、 of visual displays,alarms, or temporary or permanent records, or combinationthereof, for subsequent analysis.5. Significance and Use5.1 Eddy-current examination is a nondestructive method oflocating discontinuities in tubing made of materials thatconduct electricity. Signals can be produced by disc
12、ontinuitieslocated either on the inner or outer surfaces of the tube, or bydiscontinuities totally contained within the tube wall. Whenusing an internal probe, the density of eddy currents in the tubewall decreases very rapidly as the distance from the internalsurface increases; thus the amplitude o
13、f the response to outersurface discontinuities decreases correspondingly.5.2 Some indications obtained by this method may not berelevant to product quality. For example, an irrelevant signalmay be caused by metallurgical or mechanical variations that1This practice is under the jurisdiction of ASTM C
14、ommittee E07 on Nonde-structive Testing and is the direct responsibility of Subcommittee E07.07 onElectromagnetic Method.Current edition approved June 1, 2010. Published July 2010. Originally approvedin 1979. Last previous edition approved in 1998 as E690 98(2004)1. DOI:10.1520/E0690-10.2For referen
15、ced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available fromAmerican Society for Nondestructive Testing (ASNT), P.O. B
16、ox28518, 1711 Arlingate Ln., Columbus, OH 43228-0518, http:/www.asnt.org.4Available from Aerospace Industries Association of America, Inc. (AIA), 1000Wilson Blvd., Suite 1700,Arlington, VA22209-3928, http:/www.aia-aerospace.org.1*A Summary of Changes section appears at the end of this standard.Copyr
17、ight ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.are generated during manufacture but that are not detrimentalto the end use of the product. Irrelevant indications can maskunacceptable discontinuities occurring in the same area. Rel-evant i
18、ndications are those that result from nonacceptablediscontinuities. Any indication above the reject level, which isbelieved to be irrelevant, shall be regarded as unacceptableuntil it is proven to be irrelevant. For tubing installed in heatexchangers, predictable sources of irrelevant indications ar
19、elands (short unfinned sections in finned tubing), dents,scratches, tool chatter marks, or variations in cold work.Rolling tubes into the supports may also cause irrelevantindications, as may the tube supports themselves. Eddy-currentexamination systems are generally not able to separate theindicati
20、on generated by the end of the tube from indications ofdiscontinuities adjacent to the ends of the tube (end effect).Therefore, this examination may not be valid at the boundariesof the tube sheets.6. Basis of Application6.1 The following criteria may be specified in the purchasespecification, contr
21、actual agreement, or elsewhere, and mayrequire agreement between the purchaser and the supplier.6.1.1 Type of eddy-current system, and probe (coil assem-bly) configuration,6.1.2 Location of heat exchanger, if applicable,6.1.3 Size, material, and configuration of tubes to be exam-ined,6.1.4 Extent of
22、 examination, that is, length, tube sheet areas,straight length only, minimum radius of bends, etc.,6.1.5 Time of examination, that is, the date and location ofthe intended examination, and the expected environmentalconditions,6.1.6 The source and type of material to be used forfabricating the refer
23、ence standard,6.1.7 The type(s), method of manufacture, location, dimen-sions, and number of artificial discontinuities to be placed onthe reference standard,6.1.8 Allowable tolerances for artificial discontinuities, andmethods for verifying compliance,6.1.9 Methods for determining the extent of end
24、 effect,6.1.10 Maximum time interval between equipment refer-ence checks,6.1.11 Criteria to be used in interpreting and classifyingobserved indications,6.1.12 Disposition of examination records and referencestandard,6.1.13 Contents of examination report, and6.1.14 If specified in the contractual agr
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