1、BRITISH STANDARD BS EN 27201-2:1994 ISO 7201-2: 1991 Fire protection Fireextinguishing media Halogenated hydrocarbons Part 2: Code of practice for safe handling and transfer procedures The European Standard EN27201-2:1994 has the status of a British Standard UDC 614.842.612:661.723BS EN27201-2:1994
2、This British Standard, having been prepared under the directionof the Fire StandardsPolicy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 15August1994 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference FSM/15 D
3、raft for comment 89/35650 DC ISBN 0 580 22987 4 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstit
4、ut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland
5、Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normaliz
6、acin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBS EN27201-2:1994 BSI 09-1999 i Contents Page Cooperating organizations Inside fron
7、t cover National foreword ii Foreword 2 1 Scope 3 2 Normative reference 3 3 Definition 3 4 Materials for use in contact with halon 1211 and halon 1301 3 5 Avoidance of mixing and/or contamination 3 6 Pressure hazard 3 7 Toxicity hazard 3 8 Methods of transfer 4 9 Filling operations 4 10 Recovery ope
8、rations 5 Annex A (informative) A-Deviations 6 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-reference Inside back coverBS EN27201-2:1994 ii BSI 09-1999 National foreword This Part of BS EN27201-2 has been prepared under the direction
9、of the Fire Standards Policy Committee and is the English language version of EN27201-2:1994 Fire protection Fire extinguishing media Halogenated hydrocarbons Part 2: Code of practice for safe handling and transfer procedures, published by the European Committee for Standardization (CEN). It is iden
10、tical with ISO7201-2:1991 Fire extinguishing media Halogenated hydrocarbons Part2: Code of practice for safe handling and transfer procedures of halon 1211 and halon 1301. It supersedes BS5635-2.2:1989, which is withdrawn. BS6535-2.2:1989 was submitted to ISO for adoption as an International Standar
11、d, but was adopted with some editorial rearrangement and amendment of the text; this was published as ISO7201-2:1991. In1994 the European Committee for Standardization (CEN) accepted ISO7201-2:1991 as European Standard EN27201-2:1994. As a consequence of implementing the European Standard the Britis
12、h Standard has been renumbered and published incorporating these editorial changes. BS EN27201 is in two Parts. Part 1 gives the specifications for halon1211 and halon1301. This Part gives procedures for the transfer of halons from one container to another. These procedures can be applied to the fil
13、ling and emptying of halon fire extinguishers and the containers used in halon extinguishing systems, to the handling of halon shipping containers and to the recovery of halons from containers which are to be scrapped, cleaned internally examined, etc. These procedures are recommended as good practi
14、ce to reduce unnecessary emission of halons which may have a damaging effect on the atmosphere. Where extinguishers are being refilled, BS6643-1, which specifies requirements for the refilling of extinguishers conforming to BS5423, should be consulted. It has been assumed in the preparation of this
15、standard that the execution of its recommendations is entrusted to appropriately qualified and experienced people. 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 Br
16、itish 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 and ii, theEN title page, pages 2 to 6, an inside back cover and a back cover. This standard has been updated (see copyright date) and may
17、have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 27201-2 May 1994 UDC 614.842.612:661.723 Descriptors: Fire protection, fire extinguishing installation, dangerous materials, hydrocarbons, ha
18、lohydrocarbons, materials handling, specifications, safety requirements English version Fire protection Fire extinguishing media Halogenated hydrocarbons Part 2: Code of practice for safe handling and transfer procedures (ISO 7201-2:1991) Protection contre lincendie Agents extincteurs Hydrocarbures
19、halognes Partie2: Specifications pour manipulation sureet transvasement (ISO 7201-2:1991) Brandbekmpfung Loschmittel Halogenierte Kohlenwasserstoffe Teil 2: Festlegungen fr sichere Handhabung und Umfullen (ISO 7201-2:1991) This European Standard was approved by CEN on1994-05-16. CEN members are boun
20、d to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for 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 Ce
21、ntral Secretariat or to any CEN member. This European Standard exists in three 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 Central Secretariat has the same status a
22、s the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit E
23、uropen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1994 Copyright reserved to CEN members Ref. No. EN 27201-2:1994 EEN27201-2:1994 BSI 09-1999 2 Foreword The endorsement of the International Standard ISO7201-2:1991 as a European Standard w
24、as recommended by the Technical Committee CEN/TC191, the secretariat of which is held by BSI,on1992-10-20. The text of the International Standard ISO7201-2:1991 was approved by CEN as a European Standard without any modification. This European Standard is only available in the English and French ver
25、sions. In accordance with CEN Regulations the foreword to the ISO standard is not included in this European Standard. The following warning which does not appear in the foreword to the ISO standard, is included here with the agreement of CEN/TC191. WARNING. Halon1211 and halon1301 are listed in the
26、Montreal Protocol on Substances that Deplete the Ozone Layer. There are agreements which limit their use. Users of this European Standard are advised to consult the relevant authorities on these matters when supplying or handling halon1211 or halon1301. Compliance with this European Standard does no
27、t in itself confer immunity from legal obligations. 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 November1994, and conflicting national standards shall be withdrawn at the latest by November199
28、4. In accordance with the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the Unite
29、d Kingdom.EN27201-2:1994 BSI 09-1999 3 1 Scope This part of ISO7201 recommends procedures to be used in the transfer of halon1211 and halon1301 from one container to another to reduce unnecessary emission of these halons to the atmosphere. It also provides recommendations and information relevant to
30、 the health and safety of persons engaged in such procedures. 2 Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO7201. At the time of publication, the edition indicated was valid. All standards are subject
31、to revision, and parties to agreements based on this part of ISO7201 are 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 7201-1:1989, Fire protecti
32、on Fire extinguishing media Halogenated hydrocarbons Part 1: Specifications for halon1211 and halon1301. 3 Definition For the purposes of this part of ISO7201, the following definition applies. 3.1 halon halogenated hydrocarbon used as a fire extinguishing medium the term “halon(s)” is used in this
33、part of ISO7201 to mean halon1211 and halon1301 NOTE 1The following numbering system is used to identify individual halons. The word “halon” is followed by a number, usually comprising four digits, which represents, in the order given, the number of carbon, fluorine, chlorine and bromine atoms. Wher
34、e this number would terminate with one (or more) zero(s), such zeros are omitted. Thus halon1211 is bromochlorodifluoromethane (CF 2 ClBr) and halon1301 is bromotrifluoromethane (CF 3 Br). NOTE 2Halon1211 is a colourless, faintly sweet-smelling gas. Halon1301 is a colourless, odourless gas. 4 Materi
35、als for use in contact with halon 1211 and halon 1301 Halon1211 and halon1301 are stable and inert to most common construction materials. Manufacturers test data should be consulted when selecting materials suitable for use in contact with halons. 5 Avoidance of mixing and/or contamination 5.1 Avoid
36、ance of mixing Halon1211 and halon1301 are miscible in all proportions. Halons should not be mixed because this will unnecessarily complicate their subsequent recovery and reprocessing. 5.2 Avoidance of contamination Precautions should be taken to prevent the entry of oil, water and/or other foreign
37、 matter into halon containers. NOTE 3Excessive moisture in containers may lead to corrosion, either directly, or indirectly by causing hydrolysis of the halon. 6 Pressure hazard 6.1 General Halons are shipped, stored and used in fire extinguishing equipment as liquefied gases under pressure. Appropr
38、iate precautions should be observed when filling and handling containers. 6.2 Pressure control in transfer procedures It is essential that nitrogen cylinders are fitted with a pressure-reducing valve to control the nitrogen pressure to not more than the working pressure of the halon containers in us
39、e at any particular time. The pressure-reducing valve should be fitted with a pressure gauge on the outlet side, and with a pressure-relief valve in the line to vent excess pressure if the pressure-reducing valve fails. WARNING Bursting discs are not suitable pressure-relief devices for this applica
40、tion because their operation will vent the total contents of the halon container. 7 Toxicity hazard 7.1 Skin contact hazard Direct contact with liquid halons can degrease the skin and cause a strong chilling effect. Gloves and eye protection should be worn during transfer procedures. 7.2 Inhalation
41、hazard 7.2.1 Natural (undecomposed) halons 7.2.1.1 Effects of exposure Tests on human volunteer subjects have shown that the maximum safe exposures are7% (V/V) to10% (V/V) of halon1301 for1min and4% (V/V) to5% (V/V) of halon1211for1min.EN27201-2:1994 4 BSI 09-1999 After exposure for1min at these con
42、centrations, the volunteers experienced symptoms of dizziness and slight tingling of the fingers and toes. Exposures to concentrations less than these for several minutes would be unlikely to produce any significant effect, but prolonged exposure to concentrations greater than these is hazardous and
43、 should be avoided. 7.2.1.2 Precautions Attention should be paid to checking for and sealing any leaks in the equipment. All transfer procedures should be carried out in well-ventilated areas. It is good practice to avoid all unnecessary exposure to halons and an occupational exposure limit of1000pp
44、m(8h time-weighted average) should be applied. 7.2.1.3 Treatment of affected persons Persons suffering from overexposure to halon vapour should immediately move, or be moved, to an area containing fresh air. In treating persons suffering from the effects of overexposure to halons, the use of epineph
45、rine (adrenaline) and similar drugs should be avoided because they may produce cardiac arrhythmias, including ventricular fibrillation. 7.2.2 Decomposition products 7.2.2.1 Formation of decomposition products On exposure to a flame or hot surface, halons pyrolyse into decomposition products usually
46、identified as halogen acids (i.e. HF, HCl and HBr) and free halogens (e.g. Cl 2and Br 2 ). Halon decomposition products have a characteristic, sharp, acrid odour even in minute concentrations that are far below the concentrations considered to be immediately dangerous. The irritation produced by the
47、se products provides a built-in warning system and thus encourages people to evacuate the area. 7.2.2.2 Precautions Radiant heaters, heaters with open flames and heaters with hot elements in contact with the air should not be used in areas in which halon transfer procedures are carried out. Other op
48、en flames and, in particular, smoking should be prohibited in these areas. 8 Methods of transfer 8.1 General Halon should be transferred from one container to another by one of the methods described in8.2 and8.3. 8.2 Nitrogen overpressurization method Use dry nitrogen to pressurize the vapour space
49、in the supply container to dispense the contents. It is essential that the moisture content of the nitrogen should not exceed0,006% (m/m) (seealso5.2). It is essential that the safe working pressure of the supply container is not exceeded. NOTE 4Excessive moisture in containers may lead to corrosion, either directly, or indirectly by causing hydrolysis of the halon. NOTE 5Halon1211 and halon1301 can be propelled from extinguishing equipment by using nitrogen. 8.3 Pumping The pump should be located as near as possible to the sup
