1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationEquipment for fireprotection and fire fighting Fire extinguishing media Carbon dioxideBS EN ISO 5923:2012National forewordThis British Standard is the UK implementation of EN ISO
2、 5923:2012. It supersedes BS EN 25923:1994 which is withdrawn.The UK participation in its preparation was entrusted by Technical CommitteeFSH/18, Fixed fire fighting systems, to Subcommittee FSH/18/6, GaseousExtinguishing Media and Systems.A list of organizations represented on this committee can be
3、 obtained onrequest to its secretary.This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application. The British Standards Institution 2012 Published by BSI Standards Limited 2012 ISBN 978 0 580 74002 2 ICS 13.220.10Complianc
4、e with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2012.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN ISO 5923:2012EUROPEAN S
5、TANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 5923 August 2012 ICS 13.220.10 Supersedes EN 25923:1993English Version Equipment for fire protection and fire fighting - Fire extinguishing media - Carbon dioxide (ISO 5923:2012) quipement de protection et de lutte contre lincendie - Agents extincteurs
6、- Dioxyde de carbone (ISO 5923:2012)Ausrstung fr Brandschutz und Brandbekmpfung - Lschmittel - Kohlenstoffdioxid (ISO 5923:2012) This European Standard was approved by CEN on 14 August 2012. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
7、giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three
8、official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodie
9、s of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spa
10、in, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN na
11、tional Members. Ref. No. EN ISO 5923:2012: EBS EN ISO 5923:2012EN ISO 5923:2012 (E) 2 Contents Page Foreword 3BS EN ISO 5923:2012EN ISO 5923:2012 (E) 3 Foreword This document (EN ISO 5923:2012) has been prepared by Technical Committee ISO/TC 21 “Equipment for fire protection and fire fighting“ in co
12、llaboration with Technical Committee CEN/TC 191 “Fixed firefighting systems” the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2013, and conflicting
13、 national standards shall be withdrawn at the latest by February 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document s
14、upersedes EN 25923:1993. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic
15、of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement notice The text of ISO 5923:2012 has been approved
16、 by CEN as a EN ISO 5923:2012 without any modification. BS EN ISO 5923:2012ISO 5923:2012(E) ISO 2012 All rights reserved iiiContents PageIntroduction v1 Scope 12 Normative references . 13 Terms and definitions . 14 Requirements . 15 Sampling 25.1 General . 25.2 Sampling equipment . 25.3 Procedure 26
17、 Methods of test 36.1 Safety warning . 36.2 Purity . 36.3 Water content . 36.4 Oil content . 36.5 Total sulfur compounds content . 37 Packaging and labelling 3Annex A (informative) Determination of water content 4Annex B (normative) Determination of oil content 6Annex C (normative) Determination of
18、total sulfur compounds content 9Annex D (informative) General properties .12Annex E (normative) Precautions for handling 13Annex F (informative) Compatibility 14Annex G (informative) Toxicology 15BS EN ISO 5923:2012ISO 5923:2012(E)IntroductionThis International Standard is one of a series of other I
19、nternational Standards giving specifications for fire extinguishing media in common use and which are in need of a specification for fire fighting purposes. These specifications are designed to establish that the medium in question has at least a minimum useful fire extinguishing capability and can
20、therefore be reasonably sold for fire extinguishing purposes.Requirements for media used in particular equipment will form the subject of future International Standards.Annexes A to C of this International Standard specify methods for determining, respectively, water, oil and total sulfur compounds
21、contents. Annexes D to G provide important information on, and give recommendations relating to, the safety and use of carbon dioxide, and they should be read carefully by all concerned with this medium. ISO 2012 All rights reserved vBS EN ISO 5923:2012Equipment for fire protection and fire fighting
22、 Fire extinguishing media Carbon dioxide1 ScopeThis International Standard specifies requirements for carbon dioxide for use as a fire extinguishing medium.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the
23、edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 385:2005, Laboratory glassware BurettesISO 648:2008, Laboratory glassware Single-volume pipettesISO 2591-1:1988, Test sieving Part 1: Methods using test sieves of woven
24、 wire cloth and perforated metal plateISO 3310-1:2000, Test sieves Technical requirements and testing Part 1: Test sieves of metal wire cloth3 Terms and definitionsFor the purposes of this document, the following definition applies.3.1carbon dioxideC02chemical compound C02used as a fire extinguishin
25、g medium4 RequirementsCarbon dioxide shall comply with the requirements of Table 1 below, when tested by the appropriate method of test specified in Clause 6.Table 1 Requirements for carbon dioxide propertiesProperty RequirementsPurity, o/o (VI V) min. 99,5Water content, o/o (m/m) max. 0,015Oil cont
26、ent, ppm by mass, max. 5Total sulfur compounds content, expressed as sulfur, ppm by mass, max. 5,0NOTE Carbon dioxide obtained by converting dry ice to liquid will not usually comply with these requirements unless it has been properly processed to remove excess water and oil.INTERNATIONAL STANDARD I
27、SO 5923:2012(E) ISO 2012 All rights reserved 1BS EN ISO 5923:2012ISO 5923:2012(E)5 Sampling5.1 GeneralSamples of carbon dioxide needed to perform all of the tests required by this International Standard shall be taken from the same manufacturing lot, using identical sampling procedures.NOTE Attentio
28、n is drawn to the need to design equipment for handling carbon dioxide such that it is either capable of withstanding the pressures involved or is protected from them.5.2 Sampling equipmentRigid metal connections or a flexible reinforced nylon hose should be used throughout the sampling equipment an
29、d shall be kept as short as possible. All components shall have a design pressure of not less than 137 bar.5.3 Procedure5.3.1 GeneralTwo methods of sampling are specified:a) direct sampling, in which the sample is passed to an evaporator and then directly to the analytical apparatus;b) sampling in c
30、ylinders, in which case the sample is transferred in a cylinder to a laboratory.Other methods may be used provided that they are shown to give equally representative samples on analysis (see Annexes A to C).5.3.2 Direct samplingConnect the sampling valve by means of suitable connections (see 5.2) to
31、 an evaporating device and then via a T-piece (the free leg of which is connected to the dip-tube of a Drechsel bottle containing 50 mm of mercury covered by a layer of water on the carbon dioxide side) to the analytical apparatus. Thoroughly flush the connections, valves and the evaporating device
32、with carbon dioxide before starting to take the sample.5.3.3 Sampling in cylindersUse a cylinder of water capacity 1,4 kg or 2,0 kg and with a valve at each end.An internal copper dip-tube of diameter at least 5 mm and of length equal to one-third of the length of the cylinder shall be brazed to the
33、 base of one valve, which shall be clearly identified. The cylinder shall be coated internally with tin containing 1 % (m/m) of lead applied by hot dipping the cylinder after the walls have been descaled.First clean the sampling cylinder by removing both valves and washing the inside of the cylinder
34、 with carbon tetrachloride. Purge with a current of dry filtered air. Wash with methanol and repeat the purging. Degrease the valves using carbon tetrachloride, then refit them. The methanol and carbon tetrachloride used shall comply with the requirements specified in B.2.Support the cylinder vertic
35、ally with its dip-tube valve uppermost. Before taking the sample, thoroughly flush the cylinder with a small quantity of liquid carbon dioxide, first through the top valve and then through the bottom valve. Repeat this flushing procedure, and leave the cylinder connected to the liquid carbon dioxide
36、 source via its lower valve. Then, with the upper valve closed, open the lower valve to admit liquid carbon dioxide to the cylinder. Partly open the upper (dip-tube) valve and continue filling until carbon dioxide snow is discharged from this valve. Close both valves. Open the top valve several time
37、s for brief intervals until only carbon dioxide gas is discharged from it. The free end of the dip-tube inside the cylinder will then be just above the liquid carbon dioxide level in the cylinder.Samples shall be analysed as soon as reasonably practicable after collection. To withdraw the sample for
38、 analysis, support the sampling cylinder vertically with the dip-tube valve at the top. Connect the bottom valve 2 ISO 2012 All rights reservedBS EN ISO 5923:2012ISO 5923:2012(E)of the sampling cylinder (liquid carbon dioxide) to an evaporating device and thence via a T-piece, the free leg of which
39、is connected to a tube as described in 5.3.2, to the analytical apparatus. Thoroughly flush the connections, valves and the evaporating device with carbon dioxide before starting the analysis.When sampling for the determination of water content, heat the connections to above the dew point to prevent
40、 condensation during purging.6 Methods of test6.1 Safety warningAttention is drawn to the need to design equipment for handling carbon dioxide such that it is either capable of withstanding the pressures involved or is protected from them.6.2 PurityDetermine the purity by gas-liquid chromatography,
41、using generally accepted laboratory techniques, or use a volumetric analyser.The method used shall be capable of determining the purity with an accuracy of at least 0,1 %.The sample shall not constitute more than 10 % of the original quantity of carbon dioxide contained in the sample container.6.3 W
42、ater contentDetermine the water content by the method specified in Annex A or by any other method giving equivalent results.6.4 Oil contentDetermine the oil content by the method specified in Annex B or by any other method giving equivalent results.6.5 Total sulfur compounds contentDetermine the tot
43、al sulfur compounds content by the method specified in Annex C or by any other method giving equivalent results.7 Packaging and labelling7.1 Carbon dioxide shall be shipped and stored in containers that will not alter the medium or be detrimentally affected by it.NOTE The containers may need to comp
44、ly with national regulations.7.2 Containers shall be marked with the following information:a) suppliers name and address;b) “carbon dioxide”;c) package identification number;d) the number of this International Standard, i.e. ISO 5923:2012;e) recommended storage precautions. ISO 2012 All rights reser
45、ved 3BS EN ISO 5923:2012ISO 5923:2012(E)Annex A (informative) Determination of water contentA.1 PrincipleGravimetric determination of the water content by passing a sample of the gas over phosphorus pentoxide.A.2 Apparatus and materialA.2.1 Two absorption tubes, U-shape, the length of the limbs bein
46、g 100 mm and the diameter of the tubes being 12 mm, fitted with side arms and ground-glass drilled stoppers.The tubes shall be filled with the desiccant (A.2.5), which shall be held in position by small pads of cotton wool.A.2.2 Flow meter (if desired), float type, suitable for measuring a carbon di
47、oxide flow of 200 ml/min to 2 000 ml/min.A.2.3 Gas meter, calibrated for 1 I or 2,5 l per revolution.A.2.4 Test sieves, of aperture sizes 425 m and 600 m, complying with the requirements of ISO 3310-1:2000.A.2.5 DesiccantSift powdered glass or clean, dry, washed sand and retain the portion that pass
48、es through a test sieve of aperture size 600 m but is retained on a test sieve of aperture size 425 m.In general, follow the applicable recommendations and requirements of ISO 2591-1:1988.Quickly transfer a volume of fresh phosphorus pentoxide to a stoppered container (a large weighing bottle or sma
49、ll stoppered jar is suitable) and add about half as much by volume of the prepared powdered glass or sand. Vigorously shake the container to mix the components and fill the U-tubes (A.2.1) as quickly as possible with the mixture.If it is prepared in this way, it should be easy to fill the tube with the desiccant. If it is not easy, it is probable that the phosphorus pentoxide was moist before the addition of the powdered glass or sand.Prepare the desiccant in small quantities, as required.A.3 SamplingTake the sam
