BS-4559-5.6-1987 ISO-6145-6-1986.pdf
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1、BRITISH STANDARD BS 4559-5.6: 1987 ISO 6145-6: 1986 Methods for Preparation of calibration gas mixtures Part 5: Dynamic volumetric methods Section 5.6 Sonic orifices ISO title: Gas analysis Preparation of calibration gas mixtures Dynamic volumetric methods Part 6: Sonic orifices UDC 543.27:54 13 185
2、:53.089.62 Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4559-5.6:1987 This British Standard, having been prepared under the direction of the Environment and Pollution Standards Committee, was published under the authority of the Board
3、of BSI and comes into effect on 31 December 1987 BSI 12-1999 The following BSI references relate to the work on this standard: Committee reference EPC/46 Draft for comment 85/51116 DC ISBN 0 580 16257 5 Committees responsible for this British Standard The preparation of this British Standard was ent
4、rusted by the Environment and Pollution Standards Committee (EPC/-) to Technical Committee EPC/46, upon which the following bodies were represented: British Ceramic Research Association British Coal British Gas plc Cement Makers Federation Chemical Industries Association Department of Energy (Gas St
5、andards) Department of Trade and Industry (Electronics Application Division) Department of Trade and Industry (Laboratory of the Government Chemist) Department of Trade and Industry (Warren Spring Laboratory) Electricity Supply Industry in England and Wales GAMBICA (BEAMA Ltd.) Institute of Petroleu
6、m Institution of Chemical Engineers Institution of Gas Engineers Society of Chemical Industry Society of Glass Technology Society of Motor Manufacturers and Traders Limited Water-tube Boilermakers Association The following bodies were also represented in the drafting of the standard, through subcomm
7、ittees and panels: British Compressed Gases Association British Laboratory Ware Association Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4559-5.6:1987 BSI 12-1999i Conte
8、nts Page Committees responsibleInside front cover National forewordii 1Scope and field of application1 2References1 3Principle of the method1 4Practical examples3 5Operating conditions4 6Experimental determination of concentrations and examination of sources of error4 Figure 1 Gas mixer with sonic n
9、ozzles discharging into mixing chamber (schematic)3 Figure 2 Gas mixer with several sonic nozzles per component (schematic)3 Table Relative variations of C1)2 Publications referred toInside back cover 1) In preparation. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:44 GMT+00:00 2006,
10、Uncontrolled Copy, (c) BSI BS 4559-5.6:1987 ii BSI 12-1999 National foreword This Section of BS 4559 has been prepared under the direction of the Environment and Pollution Standards Committee. It is identical with ISO 6145-6:1986 “Gas analysis Preparation of calibration gas mixtures Dynamic volumetr
11、ic methods Part 6: Sonic orifices”, published by the International Organization for Standardization (ISO). This Part of ISO 6145 was prepared as a result of discussions in Technical Committee 158, Gas analysis, in which the UK has participated. BS 4559 was first published in 1970 as a single standar
12、d under the title “Methods for the preparation of gaseous mixtures”. The present revision is being issued in Parts to implement methods prepared by ISO/TC 158 and to provide for revision, where necessary, of the methods included in the 1970 edition which was withdrawn in 1981. Part 5 of this standar
13、d covers the preparation of mixtures using dynamic volumetric methods. This Section covers sonic orifices. Other Sections in this Part of BS 4559 are as follows. Section 5.1: Methods of calibration; Section 5.2: Volumetric pumps method2); Section 5.3: Periodic injections into a flowing gas stream; S
14、ection 5.4: Continuous injection method; Section 5.5: Capillary method2); Section 5.7: Mass flow controllers method2); Section 5.8: Diffusion method2). Terminology and conventions. The text of the International Standard has been approved as suitable for publication as a British Standard without devi
15、ation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker.
16、Wherever the words “International Standard” and “part 6 of ISO 6145” appear, referring to this standard, they should be read as “British Standard” and “Section 5.6 of BS 4559” respectively. 2) In preparation. Cross-references International StandardCorresponding British Standard BS 4559 Methods for p
17、reparation of calibration gas mixtures Part 1 Weighing methods ISO 6142:1981Section 1.1:1983 Mixtures containing components fully vaporizable under ambient conditions (Identical) Part 5 Dynamic volumetric methods ISO 6145-1:1986Section 5.1:1987 Review of methods of calibration (Identical) Licensed C
18、opy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 4559-5.6:1987 BSI 12-1999iii 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. Compli
19、ance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, pages 1 to 10, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have
20、 had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:44 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Fri Dec 01 08:27:44 GMT+00:00 2006, U
21、ncontrolled Copy, (c) BSI BS 4559-5.6:1987 BSI 12-19991 1 Scope and field of application This International Standard constitutes part 6 of ISO 6145, dealing with the various dynamic volumetric techniques used for the preparation of calibration gas mixtures. It describes the method of preparation, us
22、ing orifices with sonic flow, of calibration gas mixtures with one or more components, with a volume ratio equal to or greater than 0,1 %, the repeatability of which on the concentration of each of the components is approximately 0,5 % in relative value. 2 References ISO 6142, Gas analysis Preparati
23、on of calibration gas mixtures Weighing methods. ISO 6145-1, Gas analysis Preparation of calibration gas mixtures Dynamic volumetric methods Part 1: Methods of calibration. 3 Principle of the method 3.1 General The method consists of adding, to a mixing chamber, constant mass flow rates of gas obtai
24、ned by sonic flow of gas at a constant pressure through appropriate channels. 3.2 Operating principle of an orifice with sonic or critical flow For a given upstream pressure p1, the mass flow rate of a pressure-difference device (orifice plate or nozzle) increases when the downstream pressure p2 dec
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