1、BRITISH STANDARD BS 701:1953 Incorporating Amendment No. 1 Specification for Brewers mash flask UDC 542.231.3:663.4.023BS701:1953 This British Standard, having been approved by the ScientificGlassware and RelatedLaboratoryApparatus IndustryStandards Committeeand endorsed bytheChairman of the Chemica
2、lDivisional Council, waspublished under the authorityof the General Councilon 17December1953 BSI 01-2000 First published November1936 First revision December1953 ISBN 0 580 34118 6 Co-operating organizations The Scientific Glassware and Related Laboratory Apparatus Industry Standards Committee, unde
3、r whose supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Admiralty* Air Ministry Association of British Chemical Manufacturers* Association of Scientific Workers Board of Trade British A
4、ssociation for the Advancement of Science* British Chemical Ware Manufacturers Association* British Laboratory Ware Association* British Lampblown Scientific Glassware Manufacturers Association* British Pharmacopia Commission British Scientific Instrument Research Association* Chemical Society Depar
5、tment of the Government Chemist D.S.I.R. Chemical Research Laboratory Glass Manufacturers Federation* Institute of Petroleum* Ministry of Education Ministry of Health* Ministry of Supply* National Physical Laboratory* Oil Companies Materials Committee Pharmaceutical Society of Great Britain Royal In
6、stitute of Chemistry* Science Masters* Association Society of Chemical Industry Society of Glass Technology* Society of Public Analysts and Other Analytical Chemists* Standardization of Tar Products Tests Committee* The Government departments and scientific and industrial organizations marked with a
7、n asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Hospital Management Committees Guild of Public Pharmacists High Commission of India Metropolitan Water Board University of Lon
8、don (Faculty of Science) Individual manufacturers Amendments issued since publication Amd. No. Date of issue Comments 4922 May 1963 Indicated by a sideline in the marginBS701:1953 BSI 01-2000 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Definition of capacity
9、 1 3 Material 1 4 Construction 1 5 Dimensions 1 6 Graduation marks 1 7 Tolerances on capacity 1 8 Inscriptions 1 Appendix A Testing of British Standard brewers mash flasks 2 Appendix B Method for the determination of capacity 2 Appendix C Subsidiary standard temperature of 27 C 2 Figure 1 British St
10、andard brewers mash flask 3 Table 1 Dimensions of brewers mash flask 1BS701:1953 ii BSI 01-2000 Foreword This standard makes reference to the following British Standard: BS 1797, Tables for use in the calibration of volumetric glassware. This British Standard specifies a flask with graduation marks
11、at500 and515ml.suitable for the analysis of malts for the determination of brewers extract in the brewing industry. It was first published in1936, under the title “Brewers flasks”, and has now been revised and brought into line with other recent British Standards for volumetric glassware. Tests have
12、 shown that the requirement in Clause4 regarding stability on an inclined plane is readily satisfied by good quality flasks in current production; it has been suggested that after further consideration by the manufacturers it may be possible to increase the specified minimum angle of “topple” from10
13、 to 15 . NOTEA standard temperature of27 C.may be used, for the purpose stated inAppendix C, in place of the temperature of20 C.mentioned in Clauses2 and8, Appendix B andFigure 1. In accordance with the recommendations of Technical Committee ISO/TC 48 Laboratory Glassware and Related Apparatus, of t
14、he 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 intended that this change shall become mandatory when a revised edition of the standard is published. A British Standard
15、 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 Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an
16、inside front cover, pages i and ii, pages1 to 3 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS701:1953 BSI 01-2000 1 1 Scope This British Standard specifies a f
17、lask suitable for certain requirements of the brewing industry, having two graduation marks on the neck corresponding to capacities of500 and515ml. 2 Definition of capacity The capacity corresponding to either graduation mark is defined as the volume of water at20 C., expressed in millilitres, conta
18、ined by the flask at20 C.when filled to that graduation mark as described inAppendix 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 inFigure 1. It shall stand
19、vertically on its base without rocking and shall not topple when placed empty on a surface inclined at an angle of10 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 construc
20、tion shall be sufficiently robust 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 than125g. 5 Dimensions The flask shall conform to the dimensions specified inTable 1. Table 1 Dimensions of brewers mash
21、flask 6 Graduation marks The 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 numbers500 and515 placed immediately above the lower and upper
22、 marks respectively. 7 Tolerances on capacity The maximum permissible error at either graduation mark shall be 0.6ml.and the maximum permissible difference between the errors at the two graduation marks shall also be0.6ml. 8 Inscriptions Each flask shall have permanently and legibly marked on it: a)
23、 The abbreviation “ml”. b) Either the inscription “In 20 C” or the inscription “C20 C” to indicate that the flask is graduated for content at20 C. c) An identification number, if required. d) The makers or vendors name or mark. e) The number of this British Standard, i.e.“BS701”. 1) Length of neck m
24、aximum 170mm. Distance of higher graduation mark from top of neck minimum 100mm. Distance between graduation marks 25to30mm. Length of cylindrical neck below lower graduation mark minimum15mm. Diameter of base 50to60mm. 1) The mark “BS701” on the product is an indication by the manufacturer that it
25、purports to 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 “BS701” on a produ
26、ct is an assurance that the product does in fact comply with the requirements of the standard. It indicates that the BSIhas 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 requir
27、ements of 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 obtai
28、ned from the Director, British Standards Institution, 2 Park Street, London,W.1.BS701:1953 2 BSI 01-2000 Appendix A Testing of British Standard brewers mash flasks The National Physical Laboratory is prepared to accept brewers mash flasks, marked with an identification number in accordance with Clau
29、se8 c), for examination for compliance with the requirements of this British Standard. Certificates of values will be issued for satisfactory flasks if required. Particulars of the fees charged can be obtained on application to the Director, National Physical Laboratory, Teddington, Middlesex. Appen
30、dix 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 speed up the process of drying, care shall be taken that the flask settles down to room temperature before testing. The clean weighed
31、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 above the water surface and also to avoid trapping any air bubbles on the walls of the flask. The lowest point of the water meniscus 2)
32、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 end. The weight of the water in the flask shall then be determined. All operations shall be carried out at room temperature. The volume
33、 of water contained by the flask at20 C.up to the graduation mark tested shall be calculated from the weight thus determined by applying a correction for water temperature and, where necessary, air temperature and pressure (seeBS1797 3) ). Appendix C Subsidiary standard temperature of27 C At the Sec
34、ond Meeting, in1951, of Technical Committee ISO/TC 48 Laboratory Glassware and Related Apparatus, of the International Organization for Standardization, it was agreed to qualify as follows the acceptance of20 C.as the standard temperature for volumetric glassware: “When it is necessary in tropical c
35、ountries to work at an ambient temperature considerably above20 C.and these countries do not wish to use exclusively the standard temperature of20 C., it is recommended that they should adopt a temperature of27 C.” In order to meet the requirements of such tropical countries it has been decided to p
36、ermit27 C., as an alternative to20 C., in British Standards for volumetric glassware. 2) The meniscus can be clearly defined by folding a strip of black paper round the neck, the top edge of the paper being not more than1mm.below the graduation mark on which the setting is to be made. The meniscus,
37、so shaded, is viewed against a white background. 3) BS1797, “Tables for use in the calibration of volumetric glassware”.BS701:1953 BSI 01-2000 3 All dimensions are in millimetres. Figure 1 British Standard brewers mash flaskBS 701:1953 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInst
38、itution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards shou
39、ld make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committe
40、e responsible, the identity of which can be found on the inside front cover. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, int
41、ernational and foreign standards publications should be addressed to Customer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise reque
42、sted. Information on standards BSI provides a wide range of information on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and service
43、s. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Subscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:0208996
44、7002. Fax:02089967001. Copyright Copyright subsists in all BSI publications. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retri
45、eval system or transmitted in any form or by any means electronic, photocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designatio
46、ns. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
