1、Designation: E 1930 02Standard Test Method forExamination of Liquid-Filled Atmospheric and Low-PressureMetal Storage Tanks Using Acoustic Emission1This standard is issued under the fixed designation E 1930; the number immediately following the designation indicates the year oforiginal adoption or, i
2、n the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers guidelines for acoustic emission(AE) examinations of new
3、and in-service aboveground storagetanks of the type used for storage of liquids.1.2 This test method will detect acoustic emission in areasof sensor coverage that are stressed during the course of theexamination. For flat-bottom tanks these areas will generallyinclude the sidewalls (and roof if pres
4、sure is applied above theliquid level). The examination may not detect flaws on thebottom of flat-bottom tanks unless sensors are located on thebottom.1.3 This test method may require that the tank experience aload that is greater than that encountered in normal use. Thenormal contents of the tank c
5、an usually be used for applyingthis load.1.4 This test method is not valid for tanks that will beoperated at a pressure greater than the examination pressure.1.5 It is not necessary to drain or clean the tank beforeperforming this examination.1.6 This test method applies to tanks made of carbon stee
6、l,stainless steel, aluminum and other metals.1.7 This test method may also detect defects in tank linings(for example, high-bulk, phenolics and other brittle materials).1.8 AE measurements are used to detect and localize emis-sion sources. Other NDT methods may be used to confirm thenature and signi
7、ficance of the AE indications (s). Proceduresfor other NDT techniques are beyond the scope of this testmethod.1.9 Examination liquid must be above its freezing tempera-ture and below its boiling temperature.1.10 Superimposed internal or external pressures must notexceed design pressure.1.11 Leaks ma
8、y be found during the course of this exami-nation but their detection is not the intention of this testmethod.1.12 The values stated in inch-pound units are to be re-garded as the standard. The SI units given in parentheses arefor information only.1.13 This standard does not purport to address all o
9、f 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. Specific precau-tionary statements are given in Section 8.2. Refe
10、renced Documents2.1 ASTM Standards:E 543 Practice for Evaluating Agencies that Perform Non-destructive Evaluation2E 650 Guide to Mounting Piezoelectric AE Sensors2E 976 Guide for Determining Reproducibility of AE SensorResponse2E 1316 Terminology for Nondestructive Examinations22.2 ANSI/ASNT Standar
11、d:Recommended Practice ASNT SNT-TC-1A for Qualifica-tion and Certification of Nondestructive Testing Person-nel3ANSI/ASNT CP-189 Standard for Qualification and Certi-fication of NDT Personnel32.3 ASME Standard:Section V, Article 12, Boiler and, flaw dimensions must be determined usingsecondary NDT m
12、ethod (for example, ultrasonic inspection).X2.1.5 Flaws that are large enough to be “fracture criticalflaws”, or that are large enough to grow to fracture critical sizebefore another re-examination is performed, shall cause a tankto be repaired or removed from service.X2.1.5.1 “Fracture critical” fl
13、aw dimensions are based uponfracture mechanics analysis of a vessel using strength proper-ties which correspond to materials of construction.X2.2 Material of ConstructionThis example is based ontanks made from carbon steel.X2.3 Instrumentation, Characteristics and Settings:Sensor sensitivity -77 dB
14、ref. 1 volt/microbar at approxi-mately 150 kHzCouplant silicone greasePreamplifier gain 40 dBPreamplifier filter 100 to 300 kHz bandpassPower/signal cable length less than 500 ft (152 m)Signal processor threshold 40 dB (0 dB=1v,preamplifier input)Signal processor filter 100 to 300 kHz bandpassHit de
15、finition time 400 sBackground noise less than 27 dB (0 dB=1v,atthepreamplifier input)Functional check amplitude greater than 80 dB (0 dB = 1v, preamp input)X3. EXAMINATION REPORTE19300210ASTM International takes no position respecting the validity of any patent rights asserted in connection with any
16、 item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical
17、committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at
18、 a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor D
19、rive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).FIG. X3.1 Sample Examination ReportE19300211
