BS 4364-1993 Specification for industrial oxygen《工业用氧气规范》.pdf

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1、BRITISH STANDARD BS 4364:1993 Specification for Industrial oxygenBS4364:1993 This British Standard, having been prepared under the directionof the Chemicals Standards Policy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15February 1993 BSI 07-1999 First pu

2、blished November 1968 Second edition February 1993 The following BSI references relate to the work on this standard: Committee reference CIC/19 Draft for comment 92 91608 DC ISBN 0 580 21536 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by

3、the Chemicals Standards Policy Committee (CIC/-) to Technical Committee CIC/19, upon which the following bodies were represented: Brewers Society British Compressed Gases Association British Soft Drinks Association Ltd. Ministry of Defence Amendments issued since publication Amd. No. Date CommentsBS

4、4364:1993 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 References 1 3 Description 1 4 Sampling 1 5 Oxygen content 1 6 Carbon monoxide and carbon dioxide content 1 7 Total hydrocarbons content 1 8 Water content 1 9 Containers 1 10 Labelling 1 Annex A (

5、informative) Safety considerations for the handling of oxygen 2 Annex B (normative) Method for the determination of oxygen content 2 Annex C (normative) Method for the determination of carbon monoxide and carbon dioxide content 3 Annex D (normative) Method for the determination of total hydrocarbons

6、 content 4 Annex E (normative) Method for the determination of water content 5 Figure B.1 Dumb-bell system: forces within the cell 2 Figure B.2 Measuring cell configuration 3 Figure B.3 Typical analyser configuration (electronic) 3 Figure D.1 Flame ionization detector (schematic) 4 List of reference

7、s Inside back coverBS4364:1993 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of the Chemicals Standards Policy Committee. BS4364:1968 was withdrawn in 1988 as obsolete. At about the same time an EC draft Directive on Food Additives (including gases) was issued,

8、requiring standards of purity of additives to be established in the implementing legislation. This, together with representation from numerous concerns, in particular the welding industry, indicated a need for a revised British Standard to be prepared. This standard represents a complete revision of

9、 BS4364:1968, in order to provide a practical standard for both producers and users of industrial oxygen. Current analytical methods are referred to in order to present a readily reproducible system of checking compliance with the requirements of this standard. Annex A is included as a reminder that

10、 safety considerations are paramount. Full details of sampling for analytical purposes are included in BS5309-2, which includes references to compressed and liquefied gases. This standard is one of a pair prepared in parallel, the other being BS4366:1993 Specification for industrial nitrogen. Refere

11、nce to this standard may be made: by a purchaser of products; by a supplier when specifying products offered; by consumer interests and legislative bodies. The role of a purchaser in monitoring a suppliers compliance with the requirements of this standard may be fulfilled by a third party, such as a

12、n accreditation or certification body. Product certification. Users of this British Standard are advised to consider the desirability of third party certification of product conformity with this British Standard based on testing and continuing product surveillance which may be coupled with assessmen

13、t of a suppliers quality systems against the appropriate Part of BS5750. Enquiries as to the availability of third party certification schemes are forwarded by BSI to the Association of Certification Bodies. If a third party certification scheme does not already exist, users should consider approach

14、ing an appropriate body from the list of Association members. 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 fro

15、m legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages1 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 amendmen

16、t table on the inside front cover.BS4364:1993 BSI 07-1999 1 1 Scope This British Standard specifies requirements for oxygen that is to be used in industrial applications. It also describes the analytical principles and methods to be used to demonstrate compliance with the specification. Requirements

17、 for containers and their labelling are also specified. This standard does not apply to oxygen for medical, breathing, electronics, or other applications where more demanding impurity limits may apply. NOTEThe oxygen is referred to hereafter as “the product”. 2 References 2.1 Normative references Th

18、is standard incorporates, by reference, provisions from specific editions of other publications. These normative references are cited at the appropriate points in the text and the publications are listed on the inside back cover. Subsequent amendments to, or revisions of, any of these publications a

19、pply to this standard only when incorporated in it by updating or revision. 2.2 Informative references This standard refers to other publications that provide information or guidance. Editions of these publications current at the time of issue of this standard are listed on the inside back cover, bu

20、t reference should be made to the latest editions. 3 Description The product shall consist essentially of oxygen, O 2 , in the form of a compressed gas or a liquid. NOTEThe gaseous product is colourless, odourless and tasteless, and slightly denser than air at equal temperatures. The liquid product

21、is odourless and light blue in colour, and boils at 183 C at 101.3 kPa pressure. One volume of liquid product gives approximately 845 volumes of gas at 15 C and 101.3 kPa. 4 Sampling For the purpose of sampling the product for analysis, the provisions of BS5309-2:1976 shall apply. 5 Oxygen content W

22、hen determined by the method described in Annex B, the product shall contain not less than 99.5 % (V/V) of oxygen, O 2 , calculated on a dry basis. 6 Carbon monoxide and carbon dioxide content When determined by the method described in Annex A, the product shall contain a volume fraction of carbon m

23、onoxide (CO) of not more than 2/10 6and shall contain a volume fraction of carbon dioxide (CO 2 ) of not more than 3/10 6 . 7 Total hydrocarbons content When determined by the method described in Annex D, the product shall contain a volume fraction of hydrocarbons expressed as methane of not more th

24、an 50/10 6 . 8 Water content When determined by the method described in Annex E on a fully charged container, the product shall contain a volume fraction of water of not more than 30/10 6in the gaseous form and not more than2/10 6in the liquid form. NOTE 1As product is removed from a fully charged c

25、ontainer, the contribution of water from the container wall may increase. NOTE 2Cryogenic liquids do not contain water as such, but may contain ice crystals. The delivery system from a source of liquid product can also contribute water from its surfaces to the product stream. 9 Containers The gaseou

26、s product shall be supplied in containers painted in accordance with BS349:1973. NOTE 1.For gaseous product attention is drawn to the Pressure Systems and Transportable Gas Containers Regulations, SI 1989 No. 21691 and amendments thereof which are currently in force. NOTE 2The liquid product is typi

27、cally supplied in specialized vacuum insulated containers for which there is no British Standard. 10 Labelling The container in which the product is supplied shall be clearly labelled with the following: a) the name, address and registered trade mark of the manufacturer or supplier; b) the caption:

28、“OXYGEN.” NOTEAttention is drawn to the Classification, Packaging and Labelling of Dangerous Substances Regulations, SI 1984 No. 12442 and amendments thereof which are currently in force.BS4364:1993 2 BSI 07-1999 Annex A (informative) Safety considerations for the handling of oxygen The product is n

29、on-toxic, but vigorously supports combustion of many materials, some of which would not burn in air. The liquid product and the cold gaseous product can cause severe burns or frostbite when in contact with the skin or respiratory tract. The product should not be used in confined spaces without venti

30、lation. Personnel should not enter areas enriched with oxygen. Annex B (normative) Method for the determination of oxygen content B.1 Principle The method uses the principle of paramagnetic susceptibility, a physical property which is considerably greater in oxygen than in other common gases. Oxygen

31、 molecules are more strongly attracted by a magnetic field than are molecules of other gases, most of which are slightly diamagnetic (repelled by a magnetic field). Magneto-dynamic oxygen analysers are based on Faradays method of determining the magnetic susceptibility of a gas by measuring the forc

32、e developed by a strong non-uniform magnetic field on a diamagnetic test body suspended in the sample gas. The test body of all measuring cells in paramagnetic oxygen analysers consists of two nitrogen-filled quartz spheres arranged in the form of a dumb-bell, as shown inFigure B.1. A single turn of

33、 fine platinum wire (the feedback coil) is secured in place around the dumb-bell. A rugged, taut band platinum ribbon suspension attached to the mid-point of the dumb-bell positions the dumb-bell in the strong non-uniform magnetic field existing between the specially shaped pole pieces of the perman

34、ent magnetic structure (seeFigure B.2). B.2 Apparatus A variety of analytical equipment suppliers provide simple, ready to run portable units for this purpose, which may be powered either by battery or mains electricity. Figure B.3 illustrates the configuration of a typical unit designed for this pu

35、rpose. B.3 Calibration Calibration of these units shall be carried out using a calibration standard that is assured by analysis traceable gravimetrically to national standards and of purity 99.95 % oxygen and the manufacturers instructions, and conveyed to the analyser in accordance with BS5309-2:19

36、76. B.4 Procedure After calibrating the instrument, introduce the sample of the product in accordance with the manufacturers instructions, and BS5309-2:1976. Record the oxygen content that is displayed by the instrument. Figure B.1 Dumb-bell system: forces withinthe cellBS4364:1993 BSI 07-1999 3 Ann

37、ex C (normative) Method for the determination of carbon monoxide and carbon dioxide content C.1 Principle The method uses the principle of infra-red absorption by different molecules at specific wavelengths in the infra-red spectrum. C.2 Apparatus C.2.1 Scanning infra-red spectrometer, conforming to

38、 BS4314-1:1968, and fitted with a gas cell of l0m minimum optical path length. C.3 Calibration Calibration of these units shall be carried out using a calibration mixture produced according to BS4559 and the manufacturers instructions, and conveyed to the analyser in accordance with BS5309-2:1976. C

39、.4 Procedure After calibrating the instrument, introduce the sample of the product in accordance with the manufacturers instructions, and BS5309-2:1976. Calculate the carbon monoxide and carbon dioxide content in accordance with BS4314-1:1968. Figure B.2 Measuring cell configuration Figure B.3 Typic

40、al analyser configuration (electronic)BS4364:1993 4 BSI 07-1999 Annex D (normative) Method for the determination of total hydrocarbons content D.1 Principle The method uses the principle of ionizing the hydrocarbon molecules that are present in a particular sample in a flame, and monitoring the chan

41、ge in potential across two electrodes in close proximity to the flame, as illustrated in Figure D.1. The change in potential is proportional to the quantity of hydrocarbons present. D.2 Apparatus D.2.1 Gas chromatograph, fitted with a flame ionization detector, a gas sampling valve, and a suitable v

42、alve to enable hydrocarbons to be “backflushed” to the detector. Nitrogen carrier gas shall be used. NOTEWhile the provisions of BS5443 will assist with the specification of such a system, many other variables, such as column type, length, carrier flow, detector temperature and oven temperature, may

43、 be left open and still provide a suitable system for determination of this impurity. D.3 Calibration Calibration of these units shall be carried out using a calibration mixture produced in accordance with BS4559 and the manufacturers instructions, and conveyed to the analyser in accordance with BS5

44、309-2:1976. The mixture shall, however, contain only methane in a balance of nitrogen, and the result of the calibration shall be expressed as “Total hydrocarbons calibrated as methane”. D.4 Procedure After calibrating the instrument, introduce the sample of the product in accordance with the manufa

45、cturers instructions and BS5309-2:1976. Record the output signal on a computing integrator and calculate the concentration of hydrocarbons in accordance with the computing integrator manufacturers instructions. Figure D.1 Flame ionization detector (schematic)BS4364:1993 BSI 07-1999 5 Annex E (normat

46、ive) Method for the determination of water content E.1 Principle The gas is passed through a direct reading hygrometer. E.2 Apparatus E.2.1 Direct reading hygrometer, of one of the following types: a) cooled mirror dew point; b) electrolytic; c) capacitance; d) piezoelectric. E.3 Calibration Ensure

47、the instrument has a current certificate of calibration demonstrating traceability to the UK national standard held at the National Physical Laboratory. E.4 Procedure Operate the direct reading hygrometer in accordance with the manufacturers instructions. Keep all sample lines as short as practicabl

48、e and, together with all ancillary equipment, ensure that they have only polytetrafluoroethylene or stainless steel wetted parts. Introduce the sample of the product in accordance with the manufacturers instructions and BS5309-2:1976. Record the water content that is displayed by the instrument.6 bl

49、ankBS4364:1993 BSI 07-1999 List of references (see clause 2) Normative references BSI standards publications BRITISH STANDARDS INSTITUTION, London BS 349:1973, Specification for identification of the contents of industrial gas containers. BS 4314, Specification for apparatus for physical methods of gas analysis. BS 4314-1:1968, Infra-red gas analysers for industrial use. BS 4559, Methods for preparation of calibration gas mixtures. BS 4559-1, Weighing methods. BS 4559-1.1:1983, Mixtures containing components fully vaporizable under