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1、J I S Z*2332 93 D 4933b08 0532947 321 J IS JAPANESE INDUSTRIAL STANDARD Test method for leaks using the pressure change measurement JIS 2 2332-1993 Translated and Published by Japanese Standards Association UDC 620.179.111 Printed in Japan 7s Copyright Japanese Standards Association Provided by IHS
2、under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:01:14 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S ZX2332 93 W q933b08 0532948 2b8 W In the event of any doubt arising, the original Standard in Japanese is to
3、be final authority Errata for JiS (English edition) are printed in Standardizafion Journal, published monthly by the Japanese Standards Association. Errata will be provided upon request, please contact: Business Department, Japanese Standards Association 4-1-24, Akasaka, Minato-ku, Tokyo, JAPAN 107
4、TEL. 03-3583-8002 FAX. 03-3583-0462 Errata are also provided to subscribers of JIS (English edition) in Monthly information. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:01:14 MDTNo r
5、eproduction or networking permitted without license from IHS -,-,- JIS Z*2332 93 D 4933608 0532949 LT4 D JAPANESE INDUSTRIAL STANDARD Test method for leaks using the pressure change measurement UDC 620.179.111 J I S Z 2332-1993 1. Scope for measuring leak rate by pressurizing or depressurizing the t
6、est object and measuring the change of gas pressure before and after passage of the predecided time. This Japanese Industrial Standard specifies the leak test method Remarks: The following standard is cited in this Standard: JIS Z 2300 Glossary of terms used in nondestructive testing 2. Definitions
7、JIS Z 2300 and the following definition apply. For the purpose of this Standard, the definitions given in depressurizing method the test object and measuring its pressure difference in the predecided period between start and finish of test. The method for measuring leak rate by depressurizing Appara
8、tus A pressurizing or depressurizing device. A pressure gauge gauge) shall be used in consideration of the measurement precision. A thermometer consideration of the measurement range and precision. A watch measurement time. Others (they are used if necessary) (a) A coldtrap (b) A barometer (c) Leak
9、standard test pieces The apparatus for this method are as follows. An appropriate pressure gauge (including a vacuum An appropriate thermometer shall be used in An appropriate watch shall be used in consideration of the Test pieces shown in Figure 1 shall be adopted as the leak standard test piece w
10、hich is used for estimating the size of leak hole (leak test piece comparison method). Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:01:14 MDTNo reproduction or networking permitted wi
11、thout license from IHS -,-,- JIS Z*2332 93 4933608 0532950 9Lb Number symbol of leak standard test piece 1 BL-10/100 2 BL-20/100 2 Z 2332-1993 Diameter of standard hole (pm) piece um) 10 100 20 100 Thickness of test Fig. 1. 4 5 Leak standard test piece Unit: mm 30. BL-50/100 50 100 BL-80/100 80 100
12、6 7 3 I BL-30/100 I 30 I 100 BL-100/100 100 BL-200/100 200 8 9 10 BL-300/100 300 100 BL-41)0/100 m 100 BL-500/100 500 100 100 100 Remarks: The symbolizing method of leak standard test piece is as follows. BL - uno / uno i - Thickness of test piece (pm) Diameter of standard hole (pm) L I Symbol indic
13、ating leak test Example: BL-10/100 .-. This symbol indicates a leak test standard piece with a standard hole diameter of 10 pm and its thickness of 100 pm. 4. Preparation 4.1 Pretreatment of test object are removed beforehand, the test object shall be dried. After oil, grease, paint, etc. which may
14、influence leakage Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:01:14 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS Zr2332 93 m 4933b08 0532953 852 m 3
15、Z 2332-1993 4.2 by an appropriate material which can be removed perfectly and quickly after test. Treatment of openings of test object An opening of test object is sealed The sealing materials which do not affect the test object should be used. 5. Test method 5.1 Test temperature temperature, unless
16、 otherwise specified. The test temperature of test object is a normal 5.2 Test pressure wise specified. The test pressure of test object is as follows, unless other- (i) In the case of pressurizing method, the test is performed by pressurizing the inside of test object to not exceeding 25% of the ma
17、ximal allowable pressure. (2) In the case of depressurizing method, the test is performed by depressuriz- ing the inside of test object and in the condition where the pressure dif- ference between the inside and atmospheric pressure is 2 kPa or more, 9.8 kPa or less. 5.3 Pressure holding time minute
18、s or more, unless otherwise specified. The pressure holding time of test object is 10 5.4 Test procedure 5.4.1 Test procedure of pressurizing method surizing method is as follows. The test procedure of the pres- (i) Preparation (a) A pressure gauge, a pressurizing device (a gas bottle), a thermomete
19、r, a recording paper, etc. are prepared. (b) The volume of test object is investigated beforehand. (c) Pretreatment and seal of the openings of test object are performed. (d) A pressure gauge is set to the test object and a pressurizing device is connected to it. (2) Pressurizing (a) The inside of t
20、est object is pressurized to the predecided pressure. (b) After pressurizing, the test is waited for some time till the instantaneous change of pressure is not observed. (cl As the initial values of test start, measurement values of pressure and temperature of test object and atmosphere are recorded
21、 with the measurement time. If the influence of temperature of the test object, and pressure and temperature of atmosphere can be disregarded on the test, these measurements may not be carried out. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/
22、1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:01:14 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS Zt2332 93 4933608 0532952 799 I 4 Z 2332-1993 (3) Pressure holding The test object is held in the predecided time as the pressurized condition. In the press
23、ure holding period, any changes of temperature and pressure (outside pressure) which may influence the test results shall not be given to the test object. (4) Measurement (4.1) After pressure holding in the predecided time, measurement values of pressure and temperature of test object and atmosphere
24、 are recorded with the measurement time. If the influence of temperature of the test object, and pressure and temperature of atmosphere can be disregarded on the test, these measurements may not be carried out. (4.2) The leak rate is calculated by the following method of (4.2.1) or (4.2.2). (4.2.1)
25、The leak rate is calculated by the formula (i) in the case where the influence of temperature change of test object and atmospheric pressure (outside pressure) can be disregarded on the test. p e b d - -Yo (1) At where, Q : leak rate (Pa-Z/s) Pabsl : absolute value of the pressure of test object at
26、the Pabsa : absolute value of the pressure of test object at the Pl P, dt V start time of measurement (Pa) finish time of measurement (Pa) measurement (Pa) measurement (Pa) : pressure of test object at the start time of : pressure of test object at the finish time of : time from start to finish of m
27、easurement (6) : volume of test object ( I ) (4.2.2) The theoretical formula to calculate the leak rate is the formula (2) in the case where the influence of temperature change of test object and/or atmospheric pressure (outside pressure) shall be considered on the test. VTm &?i!%- (2) Q=-( At T z )
28、 where, Q : leak rate (Pa*Z/s) pabsi : patmi + Pi pabs2 : patm2 + p2 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:01:14 MDTNo reproduction or networking permitted without license from
29、 IHS -,-,- J I S Z*2332 93 = 4933608 0532953 625 M 5 Z 2332-1993 where, P, time of measurement (Pa) P, time of measurement (Pa) Patmi : atmospheric pressure (outside pressure) at the start time of measurement (Pa) PatmB : atmospheric pressure (outside pressure) at the finish time of measurement (Pa)
30、 : pressure of test object at the start : pressure of test object at the finish T2-, : reference temperature 293 K TI T2 At V : absolute temperature of gas in the test object at : absolute temperature of gas in the test object at : time from start to finish of measurement (s) : volume of test object
31、 (I) the start time of measurement (K) the finish time of measurement (K) (a) The leak rate is calculated by the formula (3) in the case where the influence of temperature change of test object can not be disregarded and atmospheric pressure (outside pressure) can be disregarded on the test. VT Pz Q
32、 =a) _ . . . . . . . . . . . . . . . . . . dt (G : ) ( 3 ) where, Q : leak rate (Pa-Z/s) measurement (Pa) measurement (Pa) P, Pa At V Tao : reference temperature 293 K TI T2 : pressure of test object at the start time of : pressure of test object at the finish time of : time from start to finish of
33、measurement (s) : volume of test object (E) : absolute temperature of gas in the test object at : absolute temperature of gas in the test object at the start time of measurement (K) the finish time of measurement (K) Copyright Japanese Standards Association Provided by IHS under license with JSALice
34、nsee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:01:14 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Z+2332 93 = 4933bOA 0532954 561 6 Z 2332-1993 (b) The leak rate is calculated by the formula (4) in the case where the influence of tem
35、perature change of test object and atmospheric pres- sure (outside pressure) can not be disregarded on the test. Q=% 5-4. +vT20 Pstmz- ( 4 ) At ( 7-2 TI) At ( T 2 2-1 ) where, Q : leak rate (Pa.Z/s) measurement (Pa Pl P2 Patmi : atmospheric pressure (outside pressure) at the Patma : atmospheric pres
36、sure (outside pressure) at the At V T, : reference temperature 293 K T1 T2 : pressure of test object at the start time of : pressure of test object at the finish time of measurement (Pa) start time of measurement (Pa) finish time of measurement (Pa) : time from start to finish of measurement (s) : v
37、olume of test object ( I ) : absolute temperature of gas in the test object at : absolute temperature of gas in the test object at the start time of measurement (KI the finish time of measurement (K) Remarks 1. Outside temperature of the test object is allowed to use for T, and T2. 2. In general, th
38、e leak rate is calculated by the formula (i), but the formula (3) or (4) shall be used to obtain the leak rate in accordance with the judgement of the orderer or manufacturer in case where the remarkable changes in temperature of test object and/or atmospheric pressure (outside pressure) are observe
39、d. 3. In the calculation of leak rate, minus mark (-) of the calculated value means leakage from inside of test object to outside (flow direction of leak). It is unnecessary to note the marks (+, -) on the record, because that they have no meaning on the leak rate. (5) Release of pressurizing The pr
40、essure in the test object is released. (6) Posttreatment After measurement, an appropriate posttreatment shall be performed to remove influence on the test object. (7) Record The test results are recorded on the papers. Copyright Japanese Standards Association Provided by IHS under license with JSAL
41、icensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:01:14 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS Z*12332 93 = 4933608 0532955 4TB 7 Z 2332-1993 5.4.2 Test procedure of depressurizing method surizing method is as follows. The test p
42、rocedure of depres- (i) Preparation (a) A depressurizing device , a pressure gauge, a recording paper, etc. are prepared. (b) The volume of test object is investigated beforehand. (c) Pretreatment and seal of the openings of test object are performed. (d) A pressure gauge is set to the test object a
43、nd a depressurizing device is connected to it. (e) It is desirable that the coldtrap is set between the pressure gauge and the test object to decrease the influence on the pressure value due to emitted gas in case where a great deal of gas is emitted from the test object (in case where test precisio
44、n may be affected by emitted gas), because of measuring the pressure influenced by emitted gas (vapor) (refer to Figure 2). Fig. 2. An example of use of the coldtrap Valve - - - - - - - _ - - - - - Liquid nitrogen / - ! - Coldtrap (2) Depressurizing (a) The test object is depressurized to the predec
45、ided pressure. (b) As the initial values of test start, measurement values of pressure and temperature of test object and atomosphere are recorded with the measurement time. If the influence of temperature of the test object, and pressure and temperature of atmosphere can be disregarded on the test,
46、 these measurements may not be carried out. (3) Pressure holding The test object is held as the depressurized condition in the predecided time. In the holding period, any changes of temperature and pressure (outside pressure) which may influence the test results shall not be given to the test object
47、. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 03:01:14 MDTNo reproduction or networking permitted without license from IHS -,-,- - J I S Z*2332 93 m 4933608 O532956 334 m 8 Z 2332-1993
48、(4) Measurement (a) After pressure holding in the predecided time, measurement values of pressure and temperature of test object and atomosphere are recorded with the measurement time. If the influence of temperature of the test object, and pressure and temperature of atmosphere can be disregarded on the test, these measurements may not be carried out. (b) The leak rate is calculated by one of the formulas (i), (3) and (4). (5) Release of depressurizing The opening of test object