1、BSI Standards PublicationBS EN 12876:2015Chemicals used for treatmentof water intended for humanconsumption OxygenBS EN 12876:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 12876:2015. It supersedes BS EN 12876:2009 which is withdrawn.The UK participation
2、in its preparation was entrusted to Technical Committee CII/59, Chemicals for drinking water treatment.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are
3、responsible for its correct application. The British Standards Institution 2015.Published by BSI Standards Limited 2015ISBN 978 0 580 86485 8 ICS 13.060.20; 71.100.80 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the author
4、ity of the Standards Policy and Strategy Committee on 31 March 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12876 March 2015 ICS 71.100.80 Supersedes EN 12876:2009English Version Chemicals used for treatment of wa
5、ter intended for human consumption - Oxygen Produits chimiques utiliss pour le traitement deau destine la consommation humaine - Oxygne Produkte zur Aufbereitung von Wasser fr den menschlichen Gebrauch - Sauerstoff This European Standard was approved by CEN on 20 December 2014. CEN members are bound
6、 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 CEN
7、-CENELEC Management Centre 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 CEN-CENELEC Management Centre ha
8、s the same status as the official versions. CEN members are the national standards bodies 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, Lu
9、xembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Bru
10、ssels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12876:2015 EBS EN 12876:2015EN 12876:2015 (E) 2 Contents Page Foreword 4 Introduction .5 1 Scope 6 2 Normative references 6 3 Description .6 3.1 Identification .6 3.1.1 Che
11、mical name .6 3.1.2 Synonym or common name 6 3.1.3 Relative molecular mass .6 3.1.4 Empirical formula.6 3.1.5 Chemical formula .6 3.1.6 CAS Registry Number .6 3.1.7 EINECS reference 6 3.2 Commercial forms .6 3.3 Physical properties 7 3.3.1 Appearance, odour and taste .7 3.3.2 Density 7 3.3.3 Solubil
12、ity of pure oxygen (in water) .7 3.3.4 Vapour pressure 7 3.3.5 Boiling point at 100 kPa 3).7 3.3.6 Melting point .7 3.3.7 Specific heat .7 3.3.8 Viscosity (dynamic) .7 3.3.9 Critical temperature .7 3.3.10 Critical pressure.7 3.3.11 Physical hardness .8 3.4 Chemical properties 8 4 Purity criteria 8 4
13、.1 General 8 4.2 Composition of commercial product .8 4.3 Impurities and main by-products .8 4.4 Chemical parameters 8 5 Test methods 9 5.1 Sampling .9 5.2 Analyses .9 5.2.1 Main product 9 5.2.2 Impurities . 11 6 Labelling - Transportation - Storage . 11 6.1 Means of delivery 11 6.2 Labelling accord
14、ing to the EU legislation 11 6.3 Transportation regulations and labelling . 12 6.4 Marking 13 6.5 Storage . 13 6.5.1 Containers . 13 6.5.2 Long term stability 13 6.5.3 Storage incompatibilities . 13 Annex A (informative) General information on oxygen . 14 BS EN 12876:2015EN 12876:2015 (E) 3 A.1 Orig
15、in 14 A.1.1 Raw materials 14 A.1.2 Manufacturing process . 14 A.2 Use 14 A.2.1 Function 14 A.2.2 Form in which it is used 14 A.2.3 Treatment dose 14 A.2.4 Means of application . 14 A.2.5 Secondary effects 14 A.2.6 Removal of excess product 14 A.3 Monitoring of oxygen 14 A.3.1 Chromatographic method.
16、 14 A.3.2 Oxymeters based on electrochemical cells 15 A.3.3 Other methods . 15 Annex B (normative) General rules relating to safety 16 B.1 Rules for safe handling and use 16 B.2 Emergency procedures . 16 B.2.1 First aid . 16 B.2.2 Leaks . 16 B.2.3 Fire 16 Annex C (normative) Determination of hydroca
17、rbons content (Methane Index) . 17 C.1 General . 17 C.2 Principle 17 C.3 Apparatus . 17 C.4 Calibration 17 C.5 Procedure . 17 C.6 Accuracy. 17 Bibliography 18 BS EN 12876:2015EN 12876:2015 (E) 4 Foreword This document (EN 12876:2015) has been prepared by Technical Committee CEN/TC 164 “Water supply”
18、, the secretariat of which is held by AFNOR. 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 September 2015, and conflicting national standards shall be withdrawn at the latest by September 2015.
19、This document supersedes EN 12876:2009. 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. Significant technical difference between this
20、edition and EN 12876:2009 is as follows: a) deletion of reference to EU Directive 67/548/EEC of June 27, 1967 in order to take into account the latest Regulation in force (see 3); b) 6.2 updating of risk and safety labelling according to EU Regulation 3 and its latest Adaptations to Technical Progre
21、ss). 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 of Macedonia, France
22、, 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. BS EN 12876:2015EN 12876:2015 (E) 5 Introduction In respect of potential adverse e
23、ffects on the quality of water intended for human consumption, caused by the product covered by this European Standard: a) this European Standard provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA; b) it should be noted tha
24、t, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. NOTE Conformity with the standard does not confer or imply acceptance or approval of the product in any of the Member States of
25、 the EU or EFTA. The use of the product covered by this European Standard is subject to regulation or control by National Authorities. BS EN 12876:2015EN 12876:2015 (E) 6 1 Scope This European Standard is applicable to oxygen used for treatment of water intended for human consumption. It describes t
26、he characteristics of oxygen and specifies the requirements and the corresponding test methods for oxygen. It gives information on its use in water treatment. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for it
27、s application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1089-3, Transportable gas cylinders - Gas cylinder identification (excluding LPG) - Part 3: Colour coding 3 Description 3.
28、1 Identification 3.1.1 Chemical name Oxygen. 3.1.2 Synonym or common name None. 3.1.3 Relative molecular mass 32,00 3.1.4 Empirical formula O23.1.5 Chemical formula O = O 3.1.6 CAS Registry Number1)7782-44-7 3.1.7 EINECS reference2)231-956-9 3.2 Commercial forms Gas or cryogenic liquid. 1)Chemical A
29、bstract Service Registry Number. 2)European Inventory of Existing Commercial Chemical Substances. BS EN 12876:2015EN 12876:2015 (E) 7 3.3 Physical properties 3.3.1 Appearance, odour and taste The product is a colourless, odourless, tasteless gas or a bluish liquid. 3.3.2 Density Liquid: 1,141 g/ml a
30、t 183 C. Gas: 1,337 g/dm3at 15 C and 101,3 kPa 3). 3.3.3 Solubility of pure oxygen (in water) The solubility of oxygen at a pressure of 101,3 kPa 3)in pure water, depending on the temperature, is: a) 61 mg/l at 5 C; b) 45 mg/l at 15 C; c) 36 mg/l at 25 C. 3.3.4 Vapour pressure Oxygen is a gas at 273
31、,15 K and 101,3 kPa. 3.3.5 Boiling point at 100 kPa 3)- 182,97 C. 3.3.6 Melting point Not applicable. 3.3.7 Specific heat At a constant pressure 100 kPa: - 919 J/(kgxK) at 15 C; - 920 J/(kgxK) at 25 C. 3.3.8 Viscosity (dynamic) 2,0720 102mPaxs at 100 kPa and 27 C. 3.3.9 Critical temperature 118,6 C.
32、 3.3.10 Critical pressure 5 043 kPa 3)100 kPa = 1 bar. BS EN 12876:2015EN 12876:2015 (E) 8 3.3.11 Physical hardness Not applicable. 3.4 Chemical properties Oxygen is an oxidizing agent and a supporter of combustion. Dangerous reactions are possible with organic compounds and other combustible substa
33、nces. NOTE Oxygen-rich atmospheres (a volume fraction higher than 25 % of oxygen) increase the rate of combustion which can lead to explosive reactions. 4 Purity criteria 4.1 General This European Standard specifies the minimum purity requirements for oxygen used for the treatment of water intended
34、for human consumption. Limits are given for impurities commonly present in the product. Depending on the raw material and the manufacturing process other impurities may be present and, if so, this shall be notified to the user and when necessary to relevant authorities. Users of this product should
35、check the national regulations in order to clarify whether it is of appropriate purity for treatment of water intended for human consumption, taking into account raw water quality, required dosage, contents of other impurities and additives used in the product not stated in the product standard. Lim
36、its have been given for impurities and chemicals parameters where these are likely to be present in significant quantities from the current production process and raw materials. If the production process or raw materials lead(s) to significant quantities of impurities, by-products or additives being
37、 present, this shall be notified to the user. 4.2 Composition of commercial product Two grades of oxygen exist varying from the manufacturing process: Grade A for cryogenically derived oxygen, the minimum concentration of oxygen shall be a volume fraction of 99,5 %. Grade B for oxygen manufactured w
38、ith non cryogenic methods, the minimum concentration of oxygen shall be a volume fraction of 90 %. 4.3 Impurities and main by-products The hydrocarbons content (as Methane Index) shall not exceed a volume fraction of 50 ppm. NOTE Depending on the production route, the product can contain quantities
39、of water, nitrogen, argon, carbon dioxide and other rare gases which do not affect its use in water treatment. 4.4 Chemical parameters NOTE For the purpose of this standard, “chemical parameters” are those defined in the EU Directive 98/83/EC of 03 November 1998 (see 2). Commercial oxygen does not c
40、ontain significant levels of chemical parameters. BS EN 12876:2015EN 12876:2015 (E) 9 5 Test methods 5.1 Sampling All or part of the gas flow is sent through the analyser. Sample in a volumetric pipette of a few litres with a positive pressure from 150 kPa to 200 kPa or with an automatic sampler. Wh
41、en sampling gaseous oxygen the following shall apply: sample lines and ancillary equipment shall be compatible with use with oxygen, be clean, leak tight and have the appropriate pressure rating to deliver the sample safely and without contamination to the analyser; the sample taken shall be represe
42、ntative and apparatus shall be operated in accordance with the manufacturers recommended operating procedures. NOTE Flow rates to the analyser can require precise control, following pressure regulation, if automatic flow control devices are not an integral part of the measurement system. 5.2 Analyse
43、s 5.2.1 Main product 5.2.1.1 General The most commonly used method of oxygen content measurement is the paramagnetic method. This method has an accuracy of 0,01 % volume fraction. 5.2.1.2 Principle Magneto-dynamic oxygen analyzers are based on Faradays principle of determining the magnetic susceptib
44、ility of a gas by measuring the force 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 analyzers consists of two nitrogen-filled quartz spheres arranged in the form of a dumb-bell, as
45、shown in Figure 1. A single turn of 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 special
46、ly shaped pole pieces of the permanent magnetic structure (see Figure 2). 5.2.1.3 Apparatus A variety of analytical equipment suppliers provides simple, ready to run portable units for this purpose, which may be powered either by battery or mains electricity. Figure 3 illustrates the configuration o
47、f a typical analyser designed for this purpose. BS EN 12876:2015EN 12876:2015 (E) 10 Key 1 Force in sphere 2 Restoring force of suspension Figure 1 Dumb-bell system: Forces within the cell 5.2.1.4 Calibration Calibration of these analyzers shall be carried out using a calibration gas with a volume f
48、raction greater than 99,95 % oxygen and the manufacturers instructions, and conveyed to the analyser in accordance with 5.1. 5.2.1.5 Procedure After calibrating the analyser, introduce the sample of the product in accordance with the manufacturers instructions, and 5.1. Record the oxygen content tha
49、t is displayed by the analyser. Key 1 Pole piece 2 Dumb-bell 3 Platinum wire 4 Pole piece 5 Magnetic Field Figure 2 Measuring cell configuration BS EN 12876:2015EN 12876:2015 (E) 11 Key 1 Dumb-bell system Figure 3 Typical analyser configuration (electronic) 5.2.2 Impurities The content of hydrocarbons (as Methane Index) shall be determined in accordance with the method given in Annex C. 6 Labelling - Transportation - Storage 6.1 Means of delivery Gas: Gaseous oxygen is pressurized in cylinders up to 14,7 103kPa to 30 x 103kPa;
