1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 720-1:1999 The Euro
2、pean Standard EN 720-1:1999 has the status of a British Standard ICS 23.020.30; 71.100.20; 75.160.30 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Transportable gas cylinders Gases and gas mixtures Part 1: Properties of pure gasesThis British Standard, having been prepared u
3、nder the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 August 1999 BSI 08-1999 ISBN 0 580 32138 X BS EN 720-1:1999 Amendments issued since publication Amd. No. Date Comments National foreword This British Stand
4、ard is the English language version of EN 720-1:1999. The UK participation in its preparation was entrusted by Technical Committee PVE/3, Gas containers, to Subcommittee PVE/3/1, Valve fittings for gas cylinders, which has the responsibility to: aid enquirers to understand the text; present to the r
5、esponsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtaine
6、d on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” faci
7、lity of the BSI Standards Electronic Catalogue. 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 legal obliga
8、tions. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover. The BSI copyright notice displayed throughout this document indicates when this document was last issued.CEN European Committee for Standardiz
9、ation Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1999 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 720-1:1999 E EUROPEAN STANDARD EN 720-1 NORME
10、EUROPE ENNE EUROPA ISCHE NORM April 1999 ICS 23.020.30; 71.100.20; 75.160.30 English version Transportable gas cylinders Gases and gas mixtures Part 1: Properties of pure gases Bouteilles a gaz transportables Gaz et me langes de gaz Partie 1: Proprie te s des gaz purs Ortsbewegliche Gasflaschen Gase
11、 und Gasgemische Teil 1: Eigenschaften von Einzel Gasen This European Standard was approved by CEN on 20 December 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without
12、 any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made
13、 by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland,
14、Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 720-1:1999 BSI 08-1999 Foreword This European Standard has been prepared by Technical Committee CEN/TC 23, Transportable gas cylinders, the Secretariat of which is held by BSI. This Eur
15、opean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by October 1999, and conflicting national standards shall be withdrawn at the latest by October 1999. According to the CEN/CENELEC Internal Regulations, the na
16、tional standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
17、 This European Standard has been submitted for reference into the RID and/or in the technical annexes of the ADR. Therefore in this context the standards listed in the normative references and covering basic requirements of the RID/ADR not addressed within the present standard are normative only whe
18、n the standards themselves are. Contents Page Foreword 3 Introduction 3 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Properties of gas mixtures 3 5 Code number 4 6 List of gases 4Page 3 EN 720-1:1999 BSI 08-1999 Introduction In Europe there are 2 existing Directives which deal with the class
19、ification of gases. One relates to Dangerous Substances and Preparations, the other to the Transport of Dangerous Goods (ADR). These Directives have several conflicting classifications, e.g. toxicity is expressed in volume parts per million (p.p.m.V) in the ADR Directive and in milligrams per litre
20、(mg/l) in the Substances and Preparations Directive. The purpose of this standard is to list the properties of individual gases to facilitate the selection of valve outlets. This is different from the scope of the two Directives mentioned above, which are concerned with hazard identification and tra
21、nsport matters respectively. Consequently this standard is not in conflict with either of the two above Directives as it specifically addresses the risks of misconnection of equipment e.g. Chlorine is not an oxidant according to Transport Regulations, but the risk of mixing this gas with flammable g
22、as is well known and is addressed in this standard. 1 Scope The purpose of this part of EN 720 is to define the properties of gases on the basis of four main physicalchemical criteria i.e. fire potential, toxicity, state of gas and corrosiveness (see clause 3) for the purpose of the selection of sui
23、table valve outlets. NOTE See 3.4 for the definition of corrosiveness. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are lis
24、ted hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 720-2, Classification of
25、 gases and gas mixtures Part 2: Gases and gas mixtures Determination of fire potential and oxidizing ability. EN ISO 11114-1, Transportable gas cylinders Compatibility of cylinder and valve materials with gas contents Part 1: Metallic materials. 3 Definitions For the purpose of this European Standar
26、d, the following definitions apply. 3.1 fire potential a gas or gas mixture is said to be flammable in air if it will ignite in air at atmospheric pressure and at a temperature of 208C. The minimum content of gas or gas mixture at which it ignites is called the lower flammability limit in air. This
27、limit is determined at atmospheric pressure and at a temperature of 208C a gas or a gas mixture which is less oxidizing than air is not able, at atmospheric pressure, to support the combustion of substances, which are flammable in air 3.2 toxicity toxicity is characterized by the 50 % lethal concent
28、ration. In this standard the 50 % lethal concentration (LC 50 ) is the concentration of a gas in air, expressed in p.p.m.V., administered in a single exposure during a short period of time (24 h or less) to a group of young adult albino rats (males and females) which results in the death of half of
29、the animals in a period of at least 14 days (see 5.2) 3.3 state of gas the physical state in which gases may be stored and transported in cylinders. Four categories are adopted: deeply refrigerated liquefied; liquefied; compressed; dissolved 3.4 corrosiveness ability of the gas to damage or to destr
30、oy external living tissues (eyes and skin). Gases are assigned a corrosiveness category. This is not to be confused with corrositivity of gases with metallic materials (see EN ISO 11114-1) 4 Properties of gas mixtures From the properties of the various components given in clause 6, the properties of
31、 the gas mixtures may be determined by using the appropriate standard on gas mixtures concerning each of the physico-chemical criteria indicated in clause 1 (see EN 720-2 for the fire potential).Page 4 EN 720-1:1999 BSI 08-1999 5 Code number To be able to recognize the properties of a gas, a code nu
32、mber (FTSC) is given. This code number assigned to each gas is based on the following four physico-chemical criteria: Category I: fire potential, defining the gas behaviour with respect to flammability (see 3.1); Category II: toxicity determined by the 50 % lethal concentration (see 3.2); Category I
33、II: gas state, defining the physical state of the contents in the cylinder at 158C within a given pressure range (see 3.3); Category IV: corrosiveness (see 3.4). Each category is composed of different sub-divisions, each identified by a different digit. In this way a gas, in a given state, is charac
34、terized by a series of four digits (one digit per category) as shown in 5.1 to 5.5. 5.1 Fire potential (category I) For fire potential, gases are divided in 6 subdivisions: Subdivision 0: inert (any gas not classified under subdivisions 1 to 5 below); Subdivision 1: supports combustion (oxidizing ga
35、s having an oxidant potential equal to or less than that of air); Subdivision 2: flammable (gas having flammable limits in air) (see 3.1); Subdivision 3: spontaneously flammable; Subdivision 4: highly oxidizing (see 3.1) (oxidizing gas having an oxidant potential greater than that of air); Subdivisi
36、on 5: flammable and subject to decomposition or polymerization. 5.2 Toxicity (category II) For toxicity, gases are divided into five subdivisions: Subdivision 0: life supporting; Subdivision 1: asphyxiant (when LC 50 is greater than 15 000 p.p.m.V); Subdivision 2: toxic and asphyxiant (when 200 p.p.
37、m.V# LC 50 # 5 000 p.p.m.V); Subdivision 3: very toxic and asphyxiant (when LC 50 # 200 p.p.m.V); Subdivision 9: harmful and asphyxiant (when 5 000 p.p.m.V# LC 50 15 000 p.p.m.V) where LC 50 values correspond to 1 h exposure and mortality in 14 days and with p.p.m.V corresponding to the parts per mi
38、llion by volume. 5.3 State of the gas in the cylinder at 158C (category III) For state of the gas, gases are divided into 8 subdivisions: Subdivision 0: liquefied gas at 35 bar or less; Subdivision 1: liquefied gas at over 35 bar; Subdivision 2: liquid withdrawal liquefied gas (optional); Subdivisio
39、n 3: dissolved gas; Subdivision 4: 35 bar or less gas only (including cryogenic gas withdrawal); Subdivision 5: medium pressure range, compressed gases from 35 bar up to and including 250 bar; Subdivision 7: high pressure range, above 250 bar and up to and including 400 bar; Subdivision 8: very high
40、 pressure, above 400 bar. NOTE Subdivision 6 is not used here because it is used by the U.S. 5.4 Corrosiveness (category IV) For corrosiveness, gases are divided into 4 subdivisions: Subdivision 0: non-corrosive; Subdivision 1: non-halogen acid forming; Subdivision 2: basic; Subdivision 3: halogen a
41、cid forming. 5.5 Designation of the code This code is called FTSC code: F: for fire potential, defining the gas behaviour with respect to flammability; T: for toxicity; S: for gas state, defining the physical state of the contents in the cylinder at 158C within a given pressure range; C: for corrosi
42、veness. 6 List of gases NOTE For compressed gases the third digit used in this standard is a 5. Most of these gases may be filled at higher pressure and consequently the relevant digit 7 or 8 shall then be used. For liquefied gases the third digit used in this standard is 0 or 1 (depending on the pr
43、essure). Most of these gases may be used with liquid withdrawal and consequently the relevant digit 2 shall then be used (irrespective of the pressure).Page 5 EN 720-1:1999 BSI 08-1999 Gas Synonym Code Number Acetylene Ethyne 5130 Air 1050 Allene Propadiene 2100 Ammonia R717 2902 Antimony pentafluor
44、ide 0303 Argon 0150 Arsine 2300 Bis-trifluoromethylperoxide 4300 Boron trichloride Boron chloride 0203 Boron trifluoride Boron fluoride 0253 Bromine pentafluoride 4303 Bromine trifluoride 4303 Bromoacetone 0203 Bromochlorodifluoromethane R12B1 0100 Bromochloromethane 0100 Bromotrifluoromethane Trifl
45、uorobromomethane R13B1 0100 Bromotrifluoroethylene R113B1 2100 1,3-Butadiene (inhibited) 5100 Butane 2100 1-Butene Butylene 2100 2-Butene Butylene 2100 Carbon dioxide Carbonic acid R744 anhydride 0110 Carbon monoxide 2250 Carbonylfluoride 0213 Carbonyl sulfide Carbonoxylsulfide 2201 Chlorine 4203 Ch
46、lorine pentafluoride 4303 Chlorine trifluoride 4203 1-Chloro-1,1-difluoroethane R142b 2100 1-Chloro-1,2,2,2 tetrafluoroethane R124 0100 1-Chloro-2,2,2 trifluoroethane R133a 0100 Chlorodifluoromethane Monochlorodifluoromethane R22 0100 Chlorofluoromethane 2100 Chloroheptafluorocyclobutane C317 0100 C
47、hloromethane Methyl chloride R40 2900 Chloropentafluoroethane Monochloropentafluoroethane R115 0100 Chlorotrifluoromethane Monochlorotrifluoromethane 0100 Chlorotrifluoroethylene R1113 5200 Coal gas Mixture Cyanogen 2200 Cyanogen chloride 0303 Cyclopropane Trimethylene 2100 Deuterium 2150 Deuterium
48、chloride 0213 Deuterium fluoride 0203 Deuterium selenide 2301 Deuterium sulfide 2201 Diborane 5350 Dibromodifluoromethane R12B2 0100 1,2-Dibromotetrafluoroethane R114B2 0100Page 6 EN 720-1:1999 BSI 08-1999 Gas Synonym Code Number 2,2-Dichloro-1,1,1 trifluoroethane R123 0100 Dichloro-2-chlorovinylars
49、ine Lewisite 0303 1,2-Dichlorodifluoroethylene R1112a 0100 Dichlorodifluoromethane R12 0100 Dichlorofluoromethane R21 0100 1,2-Dichlorohexafluorocyclobutane C316 0100 Dichlorosilane 2203 1,1-Dichlorotetrafluoroethane R114a 0100 1,2-Dichlorotetrafluoroethane R114 0100 Diethylzinc 3300 1,1-Difluoroethane Ethylidene fluoride R152a 2100 1,1-Difluoroethylene Vinylidene fluoride R1132a 2110 Difluoromethane Methlylene fluoride 0110 Dimethyl ether Methyl ether 2100 Dimethylamine 2902 2,2-Dimethylpropane Neopentane Tetramethyl
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