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1、J IS JAPANESE I NDUSTRIAL STANDARD Translated and Published by Japanese Standards Association (JSNDI/ JSA) Test method for leaks using ammonia gas ICs 19.100; 71.040.40 Reference number : JIS Z 2333 : 2005 (E) PROTECTED BY COPYRIGHT 9s Copyright Japanese Standards Association Provided by IHS under l
2、icense with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 22:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- Z 2333 : 2005 Foreword This translation has been made based on the original Japanese Industrial Standard revised by the Mi
3、nister of Economy, Trade and Industry through deliberations at the Japanese Industrial Standards Committee, as the result of proposal for revision of Japanese Industrial Standard submitted by The Japanese Society for Non-destructive Inspection (JSNDI)/Japanese Standards Association (JSA) with the dr
4、aft being attached, based on the provision of Article 12 Clause 1 of the Industrial Standardization Law applicable to the case of revision by the provision of Article 14. Conse- quently JIS Z 2333 : 1993 is replaced with this Standard. Attention is drawn to the possibility that some parts of this St
5、andard may conflict with a patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have technical properties. The relevant Minister and the Japanese Industrial Standards Committee are n
6、ot responsible for identifying the patent right, application for a patent after opening to the public, utility model right or application for registration of utility model after opening to the public which have the said technical properties. Date of Establishment: 1993-02-01 Date of Revision: 2005-0
7、2-20 Date of Public Notice in Official Gazette: 2005-02-20 Investigated by: Japanese Industrial Standards Committee Standards Board Technical Committee on Iron and Steel JIS Z 2333 : 2005, First English edition published in 2005-06 Translated and published by: Japanese Standards Association 4-1-24,
8、Akasaka, Minato-ku, Tokyo, 107-8440 JAPAN In the event of any doubts arising as to the contents, the original JIS is to be the final authority. O JSA 2005 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any meani, electronic or mechanical, including p
9、hotocopying and microfilm, without permission in writing from the publisher. Printed in Japan “/AT PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 22:31:28 MDTNo repr
10、oduction or networking permitted without license from IHS -,-,- Z 2333 : 2005 Contents Page 1 2 3 4 5 5.1 5.2 5.3 5.4 6 6.1 6.2 6.3 7 7.1 7.2 8 8.1 8.2 8.3 8.4 8.5 8.6 8.7 9 Scope Normative references Definitions Principle Test apparatus . Pressure gauge . Ammonia leak test specimen . Ammonia densit
11、ometer or detecting tube . Other test apparatus Test materials Ammonia gas Aqueous ammonia Developer . Preparation . Precleaning . Treatment of openings of test object Test methods Test temperature . Test pressure Test humidity . Application of developer . Standing time . Relation among ammonia conc
12、entration. standing time and leak rate . Test procedure Retest . 1 1 1 1 1 1 1 2 2 3 3 3 3 3 3 3 3 3 3 3 4 4 4 5 10 (i) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/200
13、7 22:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- Z 2333 : 2005 10 Judgement of test results . . 11 Record 12 Safety . 13 Precautions . 10 10 11 11 (ii) PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=I
14、HS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 22:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- JAPANESE INDUSTRIAL STANDARD JIS Z 2333 : 2005 Test method for leaks using ammonia gas 1 Scope This Japanese Industrial Standard specifies the meth
15、od of test for leaks in which the ammonia gas leaking from the test object such as tank (single wall, double wall, fuel tank), vessel (pressure vessel, vacuum vessel), ammonia storage (a large capacity refrigerating system, fertilizer store house), parts (laminating speci- fication, backing specific
16、ation, double wall specification), sealed part by different ma- terial (glass, metal) and others (complicated piping system, flexible container) is detected by developer. Moreover, this test is available to detect the leak rate up to approximately 1 x 10-8 Pa - mVs. 2 Normative references The follow
17、ing standards contain provisions which, through reference in this Standard, constitute provisions of this Standard. The most recent editions of the standards (including amendments) indicated below shall be applied. JIS G 4305 Cold rolled stainless steel plates, sheets and strip JIS Z 2300 Terms and
18、definitions of nondestructive testing JIS Z 2329 Methods for bubble leak testing 3 Definitions 2300 and the following definition apply. For the purposes of this Standard, the definitions given in JIS Z a) capillary system leak test specimen (AMM-L/I) ammonia leak test speci- men in which the capilla
19、ries with a known pore size of leak and a fixed length are embedded 4 Principle The developers, which are applied to the surface of test object by coating, tape, etc., are chemically reached with a very small amount of ammonia gas leaking from the test object to change the colour from yellow to blue
20、. The leak location and leak rate are detected by observing the colour change of these developers and their diameter of colour change. 5 Test apparatus 5.1 The appropriate pressure gauge, which is calibrated beforehand in consideration of the measuring range and preci- sion, shall be used. Pressure
21、gauge (including a vacuum gauge) 5.2 Ammonia leak test specimen The ammonia leak test specimen shall be used so as to set the test conditions (gas concentration, test pressure, standing time, per- formance of developer, and test temperature) and confirm the detecting sensitivity at actual leak test
22、depending on the condition of test object and be usually a leak container or a capillary system leak specimen of not more than 1 x 10-4 Pa m3/s in leak rate. The example of capillary system leak test specimen (AMM-L/I) is shown in figure 1 and the example in use is shown in figure 2. PROTECTED BY CO
23、PYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 22:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- 2 Z 2333 : 2005 Figure 1 Ammonia leak test specime
24、n (example of capillary system leak test specimen) I)rvelnper ,- Senling conipniind /- / Ammonia gas Test, box Figure 2 Example in use for ammonia leak test specimen 5.3 Ammonia densitometer or detecting tube The ammonia densitometer or detecting tube shall be capable of measuring the ammonia concen
25、tration at the time of testing. 5.4 Other test apparatus a) Case of pressure method 1) 2) Pressure reducing valve Case of vacuum method 1) Vacuum box 2) The pressure method shall be as follows: Compressor, cylinder or other pressure device bj The vacuum method shall be as follows: Air ejector or oth
26、er vacuum pump PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 22:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- 3 Z 2333 : 2005 6 Te
27、st materials 6.1 be not less than 1 % in volume percentage. Ammonia gas The gas concentration of the ammonia gas when tested shall 6.2 Aqueous ammonia Aqueous ammonia shall be of the concentration capable of ensuring that the gas concentration is not less than 1% in volume percentage when tested. 6.
28、3 Developer The developer shall change from yellow to blue by chemical reac- tion of contacting with ammonia gas and be capable of detecting the leak of not more than 1 x 10-8 Pa - m3/s in leak rate (measuring sensitivity). 7 Preparation 7.1 The test object, after removing oil, grease, paint, alkali
29、ne com- ponent, etc. that affects the leak position of test object, shall be dried. At this time, it is desirable to purify by acidic cleaning solution for the inactivation of the part to be tested as well as by using the volatile cleaning solution with little residue. Precleaning 7.2 The openings o
30、f test object shall be tightly sealed by appropriate materials which can be removed quickly and perfectly after the test. The sealing materials which do not affect adversely the test object shall be used. Treatment of openings of test object 8 Test methods 8.1 temperature (5 O C to 35 OC), unless ot
31、herwise specified. Test temperature The test temperature of test object shall be the ordinary 8.2 erwise specified. a) Test pressure The test pressure of test object shall be as follows, unless oth- In the case of pressure method, the test shall be carried out under the pressure of not exceeding 25
32、% of the maximum allowable pressure or the atmospheric pressure. In the case of vacuum method, the test shall be carried out so that the pressure in the vacuum box is reduced to the pressure lower than atmospheric pressure by 15 kPa or over. b) 8.3 The test humidity at the test place shall be not mo
33、re than 80 % in relative humidity, unless otherwise Specified. When the long standing time the test humidity shall be lower. The test shall be carried out under the condition of preventing dew condensation because the developer will change colour falsely by dew condensation. Test humidity PROTECTED
34、BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 22:31:28 MDTNo reproduction or networking permitted without license from IHS -,-,- 4 Z 2333 : 2005 8.4 Application of developer
35、For the method to apply developer to the test object, there is the method of coating by using a spray gun or an aerosol can and the method of sticking a tape developer on which developer is applied. In the case of coating developer, the film thickness shall be aimed at 30 pm to 70 pm. In the case of
36、 using the tape developer, the gap between the test specimen and the tape shall be not more than 2 mm so as not to affect the sensitivity. 8.5 The standing time of test object, unless otherwise specified, shall be the duration longer than the value obtained by substituting the leak rate to be detect
37、ed and the ammonia concentration in (1) of the formula of 8.6 or not less than the duration in which the leak indication of ammonia leak test specimen (the test specimen capable of confirming the leak rate to be detected) becomes not less than 1 mm. The standing time of test object means the period
38、from the point in time of injecting ammonia gas to the opposite side of test specimen after the test specimen is coated with developer and pressurized or depressurized, to the point in time of starting measurement. Standing time Remarks : 8.6 Relation among ammonia concentration, standing time and l
39、eak rate The time (standing time) required for producing the colour change of 1 mm in diameter on the developer caused by leak can be expressed by formula (1) based on the ex- perimental data. (1) 9.95 10-4 Q x A T = where, T : standing time (s) Q : leak rate (Pa m3/s) A : ammonia concentration (vol
40、ume percentage 5%) Moreover, when the shape of leak portion of test object is assumed as cylindrical pore, the calculation formula of Q shall be in accordance with formula (2). - + 1.81 y (2) D2 D4 x I(P? - P%jl Q = 1.23 x 10-2 x where, Q : D : L : pi : p2 : r : r7xL L leak rate (Pa - m:Vs) diameter
41、 of pore (m) length of pore (m) test pressure (Pa) atmospheric pressure (Pa) viscosity coefficient of ammonia gas used (Pa s) (1 Note (1) In the case of the mixed gas of ammonia and nitrogen, the viscosity coefficient is roughly calculated according to the following formula. q = 1.776 x 10-5 - 7.74
42、x 10-8 x A where, A : ammonia concentration (volume percentage %o PROTECTED BY COPYRIGHT Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/14/2007 22:31:28 MDTNo reproduction or networking permitted
43、without license from IHS -,-,- 5 Z 2333 : 2005 For instance, when the leak of 1 x 10-7 Pa - m3/s is intended to be detected as the leak indication of 1 mm by using ammonia gas of 10 70 in volume percentage, the standing time of test shall be calculated according to formula (1) as follows. T = 9.95 x
44、 1 0 - 4 4 1 x 10-7 x io) = 995 (SI Namely, after the elapse of 16 min 35 s, the diameter of reaction spot grows to In the case of 2 mm in the length of pore and 2 pm in the diameter of pore, the 1 mm in diameter. leak rate under non-pressure shall be calculated from formula (2) as follows. Q = O +
45、1.81 x (2 x 10-6)2/2 x 10-3 = 3.62 x 10-9 (Pa. m3/s) 8.7 Test procedure 8.7.1 Test procedure of pressure method The test procedure of pressure method shall be as follows: a) Preparation The preparation shall be as follows: 1) A developer, a film thickness gauge, a pressure gauge, a pressure device (
46、a gas cylinder), a vacuum pump, an oxygen densitometer, ammonia gas, ammonia leak test specimen, ammonia densitometer or detecting tube, a watch, a thermometer, a hygrometer, waste cloths, a brush, a vacuum cleaner, cleaning liquid, recording papers, recording device, markers, tape, an air- line typ
47、e gas mask or a gas mask with chemical cartridge respirator as occasion demands, a dust respirator, goggles to keep dust out of the eyes, etc. are prepared. If necessary, the test conditions are determined by using an ammonia leak test specimen, unless otherwise specified. The pretreatment of test o
48、bject and the treatment of openings are carried out. 2) 3) 4) The instruments such as pressure gauge are fixed to the test object and a pressure device is connected to it. When the inside of test object is humid, ammonia gas is absorbed in mois- ture and the gas concentration may be reduced. If possible, the test object is exhausted up to approximately 250 Pa in pressure prior to the test. At that point in time, the moisture boils, the pointer of vacuum gauge stops once and again the pressure starts to reduce. At the point in t