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1、BRITISH STANDARD BS 701:1953 Incorporating Amendment No. 1 Specification for Brewers mash flask UDC 542.231.3:663.4.023 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:53:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 701:1953 This British Standard, having
2、been approved by the Scientific Glassware and Related Laboratory Apparatus Industry Standards Committee and endorsed by the Chairman of the Chemical Divisional Council, was published under the authority of the General Council on 17 December 1953 BSI 01-2000 First published November 1936 First revisi
3、on December 1953 ISBN 0 580 34118 6 Co-operating organizations The Scientific Glassware and Related Laboratory Apparatus Industry Standards Committee, under whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and
4、industrial organizations: Admiralty* Air Ministry Association of British Chemical Manufacturers* Association of Scientific Workers Board of Trade British Association for the Advancement of Science* British Chemical Ware Manufacturers Association* British Laboratory Ware Association* British Lampblow
5、n Scientific Glassware Manufacturers Association* British Pharmacopia Commission British Scientific Instrument Research Association* Chemical Society Department of the Government Chemist D.S.I.R. Chemical Research Laboratory Glass Manufacturers Federation* Institute of Petroleum* Ministry of Educati
6、on Ministry of Health* Ministry of Supply* National Physical Laboratory* Oil Companies Materials Committee Pharmaceutical Society of Great Britain Royal Institute of Chemistry* Science Masters* Association Society of Chemical Industry Society of Glass Technology* Society of Public Analysts and Other
7、 Analytical Chemists* Standardization of Tar Products Tests Committee* The Government departments and scientific and industrial organizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this Brit
8、ish Standard: Association of Hospital Management Committees Guild of Public Pharmacists High Commission of India Metropolitan Water Board University of London (Faculty of Science) Individual manufacturers Amendments issued since publication Amd. No.Date of issueComments 4922May 1963Indicated by a si
9、deline in the margin Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:53:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 701:1953 BSI 01-2000i Contents Page Co-operating organizationsInside front cover Forewordii 1Scope1 2Definition of capacity1 3Material1 4C
10、onstruction1 5Dimensions1 6Graduation marks1 7Tolerances on capacity1 8Inscriptions1 Appendix A Testing of British Standard brewers mash flasks2 Appendix B Method for the determination of capacity2 Appendix C Subsidiary standard temperature of 27 C2 Figure 1 British Standard brewers mash flask3 Tabl
11、e 1 Dimensions of brewers mash flask1 Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:53:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 701:1953 ii BSI 01-2000 Foreword This standard makes reference to the following British Standard: BS 1797, Tables for use
12、 in the calibration of volumetric glassware. This British Standard specifies a flask with graduation marks at 500 and 515 ml. suitable for the analysis of malts for the determination of brewers extract in the brewing industry. It was first published in 1936, under the title “Brewers flasks”, and has
13、 now been revised and brought into line with other recent British Standards for volumetric glassware. Tests have shown that the requirement in Clause 4 regarding stability on an inclined plane is readily satisfied by good quality flasks in current production; it has been suggested that after further
14、 consideration by the manufacturers it may be possible to increase the specified minimum angle of “topple” from 10 to 15. NOTEA standard temperature of 27 C. may be used, for the purpose stated in Appendix C, in place of the temperature of 20 C. mentioned in Clauses 2 and 8, Appendix B and Figure 1.
15、 In accordance with the recommendations of Technical Committee ISO/TC 48 Laboratory Glassware and Related Apparatus, of the International Organization for Standardization (ISO), use of the inscription “In” is now recommended in place of “C” to indicate that the flask is graduated “to contain”. It is
16、 intended that this change shall become mandatory when a revised edition of the standard is published. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standa
17、rd does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indic
18、ated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:53:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 701:1953 BSI 01-20001 1 Scope This British Standard specifies a flask suitable for certain requirements
19、of the brewing industry, having two graduation marks on the neck corresponding to capacities of 500 and 515 ml. 2 Definition of capacity The capacity corresponding to either graduation mark is defined as the volume of water at 20 C., expressed in millilitres, contained by the flask at 20 C. when fil
20、led to that graduation mark as described in Appendix B. 3 Material The flask shall be made of clear glass, as free as possible from visible defects, and shall be well annealed. 4 Construction The general shape of the flask shall be as shown in Figure 1. It shall stand vertically on its base without
21、rocking and shall not topple when placed empty on a surface inclined at an angle of 10 to the horizontal. The flange at the top of the neck shall be turned over sharply and the mouth shall not be belled to any considerable distance from the top of the neck. The construction shall be sufficiently rob
22、ust to withstand normal usage and the wall thickness shall show no gross departures from uniformity. The weight of the empty flask shall be not less than 125 g. 5 Dimensions The flask shall conform to the dimensions specified in Table 1. Table 1 Dimensions of brewers mash flask 6 Graduation marks Th
23、e graduation marks shall be fine clean permanent lines of uniform thickness, completely encircling the neck of the flask and lying in planes parallel to the base. The graduation marks shall be identified by the numbers 500 and 515 placed immediately above the lower and upper marks respectively. 7 To
24、lerances on capacity The maximum permissible error at either graduation mark shall be 0.6 ml. and the maximum permissible difference between the errors at the two graduation marks shall also be 0.6 ml. 8 Inscriptions Each flask shall have permanently and legibly marked on it: a) The abbreviation “ml
25、”. b) Either the inscription “In 20 C” or the inscription “C20 C” to indicate that the flask is graduated for content at 20 C. c) An identification number, if required. d) The makers or vendors name or mark. e) The number of this British Standard, i.e. “BS 701”.1) Length of neckmaximum 170 mm. Dista
26、nce of higher graduation mark from top of neck minimum 100 mm. Distance between graduation marks25 to 30 mm. Length of cylindrical neck below lower graduation mark minimum 15 mm. Diameter of base50 to 60 mm. 1) The mark “BS 701” on the product is an indication by the manufacturer that it purports to
27、 comply with the requirements of this British Standard. The British Standards Institution is the owner of the registered certification mark shown below: which can be used by manufacturers only under licence from the BSI. The presence of this mark in addition to the mark “BS 701” on a product is an a
28、ssurance that the product does in fact comply with the requirements of the standard. It indicates that the BSI has satisfied itself, by inspection and testing, that the system of production, supervision and control used by the manufacturer is such as to ensure compliance with all the requirements of
29、 the standard. Maintenance of this approved system is secured by periodical inspection and testing on behalf of the BSI. The mark must be accompanied by the name or registered trade mark or licence number of the licensed manufacturer. Further particulars of the terms of licence may be obtained from
30、the Director, British Standards Institution, 2 Park Street, London, W.1. Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10:53:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 701:1953 2 BSI 01-2000 Appendix A Testing of British Standard brewers mash flasks The
31、National Physical Laboratory is prepared to accept brewers mash flasks, marked with an identification number in accordance with Clause 8 c), for examination for compliance with the requirements of this British Standard. Certificates of values will be issued for satisfactory flasks if required. Parti
32、culars of the fees charged can be obtained on application to the Director, National Physical Laboratory, Teddington, Middlesex. Appendix B Method for the determination of capacity When determining the capacity of a flask the vessel shall first be thoroughly cleaned and dried. If hot air is used to s
33、peed up the process of drying, care shall be taken that the flask settles down to room temperature before testing. The clean weighed flask shall then be filled with distilled water to a few millimetres above the graduation mark to be tested, care being taken to avoid wetting the neck of the flask ab
34、ove the water surface and also to avoid trapping any air bubbles on the walls of the flask. The lowest point of the water meniscus2) shall be adjusted to the top edge of the graduation mark to be tested by withdrawing small amounts of water by means of a glass tube drawn out to a jet at its lower en
35、d. The weight of the water in the flask shall then be determined. All operations shall be carried out at room temperature. The volume of water contained by the flask at 20 C. up to the graduation mark tested shall be calculated from the weight thus determined by applying a correction for water tempe
36、rature and, where necessary, air temperature and pressure (see BS 17973). Appendix C Subsidiary standard temperature of 27 C At the Second Meeting, in 1951, of Technical Committee ISO/TC 48 Laboratory Glassware and Related Apparatus, of the International Organization for Standardization, it was agre
37、ed to qualify as follows the acceptance of 20 C. as the standard temperature for volumetric glassware: “When it is necessary in tropical countries to work at an ambient temperature considerably above 20 C. and these countries do not wish to use exclusively the standard temperature of 20 C., it is re
38、commended that they should adopt a temperature of 27 C.” In order to meet the requirements of such tropical countries it has been decided to permit 27 C., as an alternative to 20 C., in British Standards for volumetric glassware. 2) The meniscus can be clearly defined by folding a strip of black pap
39、er round the neck, the top edge of the paper being not more than 1 mm. below the graduation mark on which the setting is to be made. The meniscus, so shaded, is viewed against a white background. 3) BS 1797, “Tables for use in the calibration of volumetric glassware”. Licensed Copy: London South Ban
40、k University, London South Bank University, Fri Dec 08 10:53:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 701:1953 BSI 01-20003 All dimensions are in millimetres. Figure 1 British Standard brewers mash flask Licensed Copy: London South Bank University, London South Bank University, Fri Dec 08 10
41、:53:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 701:1953 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It
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