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1、UDC 620.1 79.1 6:621.772:620.162.4 JIS JAPANESE INDUSTRIAL STANDARD Methods for acoustic emission testing of pressure vessels during pressure test Translated and Published by Japanese Standards Association Printed in Japan 5 s Copyright Japanese Standards Association Provided by IHS under license wi
2、th JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:20:27 MSTNo reproduction or networking permitted without license from IHS -,-,- In the event of any doubt arising, the original Standard in Japanese is to be final authority. Copyright Japanese Standards Associa
3、tion Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:20:27 MSTNo reproduction or networking permitted without license from IHS -,-,- JIS ZSZ342 71 R 4733608 0088365 7 M UDC 620.179.16:621.772:620.162.4 JAPANESE INDUSTRIAL STAND
4、ARD J I S Methods for acoustic emission testing Z 2342-1991 of pressure vessels during pressure test 1. Scope .This Japanese Industrial Standard specifies the testing methods for acoustic emission (hereafter referred to as the “AE) carried out during the pressure tests of metallic pressure vessels a
5、nd their piping systems (hereafter referred to as the “pressure vessels, etc.“). - h Remarks: The standard cited in this Standard is as shown below. JIS Z 2300 Glossary of terms used in nondestructive testing 2. Definition The definitions of main terms used in this standard shall be as specified in
6、a JIs z 2300. 3. Treatment of abnormalities during tests When an abnormal occurrence of AE is observed during the tests, the tester shall promptly notify the person in charge of the pressure test and ask him to decide whether to continue or discontinue pressure application. Where pressure applicatio
7、n is discontinued, the location where AE has occurred abnormally shall be examined by other methods. 4. Test engineer The persons conducting the test shall have sufficient knowledge and experience about the AE test carried out during the pressure test of pressure vessels, etc. 5. Preparation for tes
8、t 5.1 Preliminary study The owner of the pressure vessel shall preliminarily give the following items of information to the test engineer. 1i (3) (4) (5) Arrangement plan showing the positional relations between the pressure vessel, etc. and its surroundings Drawing showing the shapes of pressure ve
9、ssel, etc. (dimensions, nozzle position, plate thickness, etc.) Material standard and heat treatment conditions for pressure vessel Conditions for welding procedure and positions of weld lines Specifications of pressure applying apparatus Schedule of pressure application Anticipated noise source Cop
10、yright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:20:27 MSTNo reproduction or networking permitted without license from IHS -,-,- JIS Z*2342 91 W 4933608 0088366 O = 2 Z 2342-1991 (8) Various
11、 items of information necessary for carrying out the test. 5.2 Test apparatus A standard constitution of test apparatus is shown in Fig. 1. The test apparatus shall have sufficient numbers of AE transducers and measuring channels for closely observing the whole region or a specific region of the pre
12、ssure vessel and its piping system. Further, the test apparatus shall be capable of recording the manner of occurrence of AE as a function of pressure or time and indicating the manner of occurrence with the undermentioned three kinds of parameters. Besides, the specifications of the test apparatus
13、in the form of Table 1 shall be decided by preliminary consultation. (1) AE event count (2) Positions of AE sources or alternative information (3) AE peak amplitude or alternative quantities Fig, 1. Standard constitution of test apparatus Pressure detecting end Pressure measuring device (external r
14、i parameter) . I -S- AE transducer I - Signal trans-. mission cable 7 4 Signal proc- essing device Recording Indicating Main amplifier Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:20:
15、27 MSTNo reproduction or networking permitted without license from IHS -,-,- JIS Z*2342 91 W 4933608 00883b7 2 W a 3 Z 2342-1991 Max. output voltage (VI - Table 1. Specification table of test apparatus Item Preamplifier Main amplifier essing Signal device proc- Gain (dB Frequency characteristic (-3
16、dB) (Hz) Cut-of f frequency (Hz) Attenuation gradient (dB/octave) Filter Input. impedance (fi) Output impedance (a) I I I I Input-converted noise (VI I I I Threshold voltage (VI Processing speed (times/s) Time resolution (SI Parameter of each part 5.3 Calibration of test apparatus The test apparatus
17、 shall be calibrated by use of artificial AE sources. location shall satisfy the value preliminarily agreed on by consultation. The precisions in threshold voltage and AE source 5.4 AE wave attenuation characteristic In order to decide the intervals of arranged AE transducers and the like, the AE wa
18、ve attenuation characteristic on the surfaces of the messure vessel, etc. shall be examined. This examination shall desirably be performed with the pressure vessel filled with a fluid by using artificial AE sources. o 5.5 Arrangement of AE transducers The AE transducers shall be arranged in such a m
19、anner that the AE waves from the region under test can be detected by a minimum number of transducers necessary for AE source location. Further, the AE transducers shall be contacted with the surfaces of the pressure vessels, etc. so as t o produce sufficient sound combination. , 5.6 Means of commun
20、ication Means shall preliminarily be established to allow constant communication between the place of installation of test apparatus and that of the pressure applying apparatus. L 5.7 Continuous recording of pressure recording of pressure to allow grasping of the relations between the pressure apply
21、ing process and the manner of AE emission. Means shall be established for continuous Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:20:27 MSTNo reproduction or networking permitted with
22、out license from IHS -,-,- J I S Z*Z342 91 4933608 00883b8 4 4 Z 2342-1991 6. Test procedure 6.1 Confirmation of operability of AE transducers The manner of sound combination of AE transducers and their connection shall be confirmed succeeding the installation of AE transducers and the assembly of t
23、est apparatus and again, immediately after completion of the test. 6.2 Measurement of intensity of background noise For all the channels used in the test, the intensity (peak voltage value) of background noise shall be measured and recorded. taken to shutting it off. Where there is a strong noise-so
24、urce, a measure shall be Because leaks from valves, flanges, safety values, etc. have the possibility of concealing the AE from the test object, it is necessary to take measures to eliminate such leaks before continuation of the test. Where the above shutting-off is impossible or where there are str
25、ong uncontrollable noises occurring as a natural phenomenon or the like, the person in charge of the AE test shall consult with the person in charge of the pressure test about the method of operating the test. 6.3 Adjustment of threshold voltage The threshold voltage of all the channels used in the
26、test shall be adjusted not to cause actuation due to background noises. In this case, the test shall be performed by filling the pressure vessel with the same content as in the pressure test. 6.4 Procedure of applying pressure to pressure vessel The procedure of applying pressure to the pressure ves
27、sel shall be as follows: (i) Pressure application speed safety devices, etc. Apply pressure by using the specified fluid, Use such a pressure applying speed as allows the AE test to be performed under minimum noise conditions. (2) Means of pressure application Generally, use pressure application ste
28、ps of 50 %, 65 %, 85 %, and 100 % of maximum test pressure. In each step, use a pressure retention time of 10 minutes, but make the final retention time at least 30 minutes. For this purpose, the pressure application apparatus shall have the function to retain pressure at the specified values. Stopp
29、ing of pressure application a remarkable quantity of AE occurs is detected during pressure application, keep the pressure unchanged or lower it, and notify such occurrence to the person in charge of the pressure test. (3) If the presence of a location where 6.5 AE measurement Start AE measurement at
30、 least 30 s before pressure application in order to measure at least the three kinds of parameters shown in 5.2, and continue it throughout all the pressure raising processes until AE occurs no longer after starting of pressure retention. In addition, confirm the influence of noise accompanying pres
31、sure application at the initial stage of pressure application, and if required, take measures to reduce the noise. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:20:27 MSTNo reproductio
32、n or networking permitted without license from IHS -,-,- 5. Z 2342-1991 6.6 Pressure measurement Continuously measure the pressure values and record them in such a way that their correspondence to the records of respective AE signals can be recognized. 7. Classification of test results The AE source
33、s assumed from the results of AE test shall be classified into the following three kinds by consulation. (1) (2) Class A Class B Location where a remarkably large quantity of AE occurred. Location where a large quantity of AE occurred. . i (3) Class C Location where some quantity of AE occurred. 8.
34、Recording The process and results of AE test shall as a rule be recorded with respect 0 to the following items. Object subjected to test Day and time of test Testing site Calibration method for test apparatus and results thereof Method of arrangement and installation of AE transducers Manner of occu
35、rrence of background noise Pressure application process (pressure applying method, pressure applying speed, pressure retension time, values of retained pressure, etc.) Manner of occurrence of AE (relations between AE event count and time or pressure, position of AE source location, etc.) Procedure o
36、f classifying test results and results thereof Name of test engineer and number of years of his experience Name of person in charge of pressure test Day and time of making records and name of recorder Kind of test fluid and test temperature Information on preliminary study of pressure vessel, etc. S
37、pecifications of test apparatus (refer to Table 1) Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:20:27 MSTNo reproduction or networking permitted without license from IHS -,-,- J I S Z
38、*2342 91 4933608 0088370 2 Z 2342-1991 Edition 1 Japanese Text Established by Minister of International Trade and Industry Date of Establishment: 1991-03-01 Date of Public Notice in Official Gazette: 1991-03-20 Investigated by: Japanese Industrial Standards Committee Divisional Council on Iron and S
39、teel Technical Committee on Non-Destructive Tests This English translation is published by: Japanese Standards Association 1-24, Akasaka 4, Minato-ku, Tokyo 107 Japan O JSA, 1991 Printed i n Tokyo by Hohbunsha Co., Ltd. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/11/2007 00:20:27 MSTNo reproduction or networking permitted without license from IHS -,-,-