ISO-383-1976.pdf
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1、INTERNATIONAL STANDARD INTERNATIONAL ORGANIZATION FOR STANDARLXZATION MExWHAPOfiHAl OPrAHW3AUWR IlO CTAHAAPTH3ALWf.ORGANISATION INTERNATIONALE DE NORMALISATION Laboratory glassware - Interchangeable conical ground joints Verrerie de laboratoire - Assemblages coniques rods ? i .: : . ,-%( $ ._ “4.y ;
2、 ys: + d ,c ;2 “r.-+ 2 :,-c34 b 6 u- - - .“” _ x t-c i “LA i UDC 542.231.7 Ref. No. IS0 383-1976 (El : 7 Descriptors : laboratory glassware, joints (junctions), conical components, specifications, interchangeability. m % 0 i!? Price based on 5 pages Copyright International Organization for Standardi
3、zation Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:03:01 MDTNo reproduction or networking permitted without license from IHS -,-,- FOREWORD IS0 (the International Organization for Standardization) is a worldwide federation of na
4、tional standards institutes (IS0 Member Bodies). The work of developing International Standards is carried out through IS0 Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International
5、organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the IS0 Council. Prior to 1972,
6、the results of the work of the Technical Committees were published as IS0 Recommendations; these documents are now in the process of being transformed into International Standards. As part of this process, Technical Committee ISO/TC 48 has reviewed IS0 Recommendation R 383 and found it technically s
7、uitable for transformation. International Standard IS0 383 therefore replaces IS0 Recommendation R 383-1964 to which it is technically identical. IS0 Recommendation R 383 was approved by the Member Bodies of the following countries : Australia Austria Belgium Canada Chile Colombia Czechoslovakia Fra
8、nce Germany Greece India Israel Japan Netherlands New Zealand Poland Romania Spain Sweden United Kingdom U.S.A. U.S.S.R. The Member Body of the following country expressed disapproval of the Recommendation on technical gorunds : Italy* l Subsequently, this Member Body approved the Recommendation. No
9、 Member Body disapproved the transformation of ISO/R 383 into an International Standard. 0 International Organization for Standardization, 1976 l Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1
10、/9972545001 Not for Resale, 04/27/2007 20:03:01 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 383-1976 (E) Laboratory glassware - Interchangeable conical ground joints 0 INTRODUCTION 1 SCOPE AND FIELD OF APPLICATION The purpose of this internati
11、onal Standard is to ensure interchangeability between standard conical ground glass joints, irrespective of where they are manufactured. In order to achieve interchangeability, it is necessary that each of the following requirements be adequately specified, including appropriate tolerances : This In
12、ternational Standard specifies the essential geometric requirements for interchangeability in relation to four series of conical ground glass joints for laboratory use. 2 REFERENCE a) taper; ISO/R 468, Surface roughness. b) large end diameter; c) length of ground zone; d) surface finish. 3 TAPER The
13、 taper of the joints shall be such as to give one increment on diameter for ten increments on axial length, with a tolerance of f 0,006 on the diameter increment, i.e. a taper of (I,00 f 0,006)/l 0. The nominal dimensions listed below are based on the series of joints already widely used in many cou
14、ntries; in particular, the series of large end diameters represents the nearest acceptable compromise to the R 40/3 series of preferred numbers (5, 3, . . . . 100) laid down in IS0 3, Preferred numbers - Series of preferred numbers. From the practical point of view, and especially because of the dif
15、ficulty of carrying out precise measurements on the ground portions of the finished joints, it is desirable to apply a gauging system which allows rapid checking of the essential dimensions. The definition of these dimensions in clause 6 is an integral part of this International Standard, but the sy
16、stem of gauging described in annex A, while it has been proved in practice as fully satisfactory, is not the only one which can be applied for the purpose. The leakage test described in annex B is one which is commonly used for testing joints, but its inclusion in this International Standard is not
17、intended to preclude the use of other tests which may be found more convenient for particular purposes. Attention is specifically drawn to the method of pneumatic gauging. ) NOTE - Actual manufacturing techniques normally result in a tighter tolerance than that given above, but owing to the lack of
18、experimental evidence it is not yet possible to reduce the specified value. , 4 LARGE END DIAMETERS The following series of large end diameters shall be adopted : 5 - 7,5 - 10 - 12,5 - 14.5 - 18,8 - 21,5 - 24 - 29.2 - 34,5-40-45-50-60-71 -85-IOOmm 5 LENGTH OF GROUND ZONE The length of the ground zon
19、e I, in millimetres, is calculated using the formula I=k d is the large end diameter, in millimetres. 1) This method is described in Laboratory practice, March 1958, Vol. 7, No. 3, “Pneumatic gauging applied to standard ground glass joints”, by I.C.P. Smith. 1 Copyright International Organization fo
20、r Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 20:03:01 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 383-1976 (El The calculated length is rounded off to the nearest whole number. The
21、 four series of joints listed in table 1 are obtained by using the values, 2,4, 6 and 8 for the constant k. k6 is the preferred series. TABLE 1 -Series of joints Dimensions in millimetres 6 TOLERANCES ON DIAMETER AND LENGTH The diameter and length of the ground zone shall be such that, when it is pl
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