BS-3680-11B-1992 ISO-TR-9824-2-1990.pdf
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1、BRITISH STANDARD BS 3680-11B: 1992 ISO/TR 9824-2:1990 Measurement of liquid flow in open channels Part 11: Free surface flow in closed conduits Part 11B: Specification for performance and installation of equipment for measurement of free surface flow in closed conduits UDC 532.57.084:532.542 License
2、d Copy: sheffieldun sheffieldun, na, Wed Nov 29 03:48:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3680-11B:1992 This British Standard, having been prepared under the direction of the Industrial-process Measurement and Control Standards Policy Committee, was published under the authority of the
3、Standards Board and comes into effect on 15 October 1992 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference PCL/3 Draft for comment 91/29060 DC ISBN 0 580 21238 6 Committees responsible for this British Standard The preparation of this British Standard
4、was entrusted by the Industrial-process Measurement and Control Standards Policy Committee (PCL/-) to Technical Committee PCL/3, upon which the following bodies were represented: Clyde River Purification Board Department of the Environment Department of the Environment for Northern Ireland Institute
5、 of Measurement and Control Institution of Water and Environmental Management National Rivers Authority Water Services Association of England and Wales Welsh Office The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Hydrological Soci
6、ety British Water Industries Group GAMBICA (BEAMA) Ltd. Water Research Centre Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 03:48:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3680-11B:1992 BSI 08-1999i Contents Page Committees res
7、ponsibleInside front cover National forewordii 1Scope1 2Normative reference1 3Definitions1 4Characteristics of the closed conduit system1 5Environmental conditions within which equipment is required to operate2 6Choice of measurement reach3 7Functional requirements3 8Performance specification4 9Addi
8、tional requirements4 Annex A (informative) Bibliography5 Figure 1 Closed conduit system1 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 03:48:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3680-11B:1992 ii BSI 08-1999 National foreword This Part of BS 36
9、80 has been prepared under the direction of the Industrial-process Measurement and Control Standards Policy Committee. It is identical with ISO/TR 9824-2:1990 Measurement of free surface flow in closed conduits Part 2: Equipment, published by the International Organization for Standardization (ISO).
10、 This standard is one of a series of Parts of BS 3680-11 on free surface flow in closed conduits. Part 11A describes the methods of measurement of free surface flow in closed conduits, and Part 11C describes methods of measurement and equipment. Cross-references. The Technical Committee has reviewed
11、 the provisions of ISO 772:1988, to which normative reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. A related British Standard to ISO 772 is BS 3680-1:1983. BS 3680-1 has since been revised, and is now published as BS 3680-1:1991. A
12、revision of ISO 772 is in preparation. The introduction to ISO/TR 9824-2 reads as follows. “The measurement of fluid flow and level in partially filled closed conduits presents particularly difficult problems and is not fully documented. This part of ISO/TR 9824 has been prepared therefore to give g
13、uidance to users on the existing equipment employed and on recent developments in this field. Efficient and effective engineering design requires accurate and reliable flow information. The flows in closed conduits may vary from zero through a free surface flow condition to a surcharged pipe-full co
14、ndition, and they may contain both floating and suspended solids as well as other contaminants which may be highly corrosive (e.g. contaminants resulting from industrial processes). The determination of flows in these conditions demands the design of specialized equipment. This part of ISO/TR 9824 s
15、ets out the performance specifications for such equipment.” 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 Standard does not of itself confer immunity from
16、legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 6, an inside back cover 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
17、 table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Wed Nov 29 03:48:16 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 3680-11B:1992 BSI 08-19991 1 Scope This part of ISO/TR 9824 specifies performance requirements of equipment for the determination of free surface flow in cl
18、osed conduits. It identifies the conditions within which such equipment is required to operate and specifies the level of uncertainty and reliability of measurement which the equipment is expected to meet. This part of ISO/TR 9824 is applicable to conduits having an internal cross-sectional area gre
19、ater than 0,018 m2 (e.g. circular conduits of diameter greater than 150 mm). It is not applicable to the measurement of flows in closed conduits which normally operate under pressure as the result of pumping. This part of ISO/TR 9824 should be used in conjunction with ISO/TR 9824-1. 2 Normative refe
20、rence The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO/TR 9824. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of ISO/TR 9824 a
21、re encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 772:1988, Liquid flow measurement in open channels Vocabulary and symbols. 3 Definitions For the
22、 purposes of this part of ISO/TR 9824, the definitions given in ISO 772 and the following definition apply. free surface flows in closed conduits flows within closed conduits, under the influence of gravity only, and normally having a free surface NOTE 1Where the total discharge exceeds the free sur
23、face capacity of the conduit, i.e. the conduit is surcharged, the free surface of the flow disappears. 4 Characteristics of the closed conduit system 4.1 Structure of the closed conduit system The general configuration of a closed conduit system is shown in Figure 1. A closed conduit is typically lo
24、cated underground but in certain instances may be above the ground surface. Systems constructed underground typically incorporate means of access through a man-sized shaft (i.e. a manhole) which is sealed at the surface by a heavy but removable cover. For the purposes of this part of ISO/TR 9824, it
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