1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA
2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any
3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-21419-7 SANS 52876:2008Edition 1EN 12876:2000Edition 1SOUTH AFRICAN NATIONAL STANDARD Chemicals used for treatment of water intended for h
4、uman consumption Oxygen This national standard is the identical implementation of EN 12876:2000 and is adopted with the permission of CEN, rue de Stassart 36, B-1050 Brussels. Published by Standards South Africa 1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 3
5、44 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 52876:2008 Edition 1 EN 12876:2000 Edition 1 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee StanSA TC 5140.19, Water, in accordance with procedures
6、 of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in April 2008. EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 12876May 2000ICS 71.100.80English versionChemicals used for treatment of water intended for humanconsumption - OxygenProd
7、uits chimiques utiliss pour le traitement de leaudestine la consommation humaine - OxygneProdukte zur Aufbereitung von Wasser fr denmenschlichen Gebrauch - SauerstoffThis European Standard was approved by CEN on 3 April 2000.CEN members are bound to comply with the CEN/CENELEC Internal Regulations w
8、hich stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Stan
9、dard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standar
10、ds bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUN
11、GCentral Secretariat: rue de Stassart, 36 B-1050 Brussels 2000 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12876:2000 ESANS 52876:2008This s tandard may only be used and printed by approved subscription and freemailing clients of
12、 the SABS .Page 2EN 12876:2000ContentsPageForeword3Introduction .41 Scope 52 Normative reference 53 Description .53.1 Identification.53.2 Commercial forms .53.3 Physical properties63.4 Chemical properties 74 Purity criteria74.1 Composition of commercial product .74.2 Impurities and main by-products
13、.74.3 Toxic substances.75 Test methods75.1 Sampling.75.2 Analyses .86 Labelling - Transportation - Storage106.1 Means of delivery.106.2 Risk and safety labelling according to the EU rules 106.3 Transportation regulations and labelling 116.4 Marking .116.5 Storage11Annex A (informative) General infor
14、mation on oxygen.12Annex B (normative) General rules relating to safety .14Annex C (normative) Determination of hydrocarbons content (Methane Index) .15Bibliography 16SANS 52876:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 3EN 128
15、76:2000ForewordThis European Standard has been prepared by Technical Committee CEN/TC 164 “Water supply“, the secretariat of which isheld by AFNOR.This European Standard shall be given the status of a national standard, either by publication of an identical text or byendorsement, at the latest by No
16、vember 2000, and conflicting national standards shall be withdrawn at the latest by November2000.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are boundto implement this European Standard: Austria, Belgium, Czech Republic, Denmark,
17、 Finland, France, Germany, Greece, Iceland,Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.Annex A is informative.The annexes B and C are normative.SANS 52876:2008This s tandard may only be used and printed by approved subscription and fre
18、emailing clients of the SABS .Page 4EN 12876:2000IntroductionIn respect of potential adverse effects on the quality of water intended for human consumption, caused by theproduct covered by this Standard :1) This Standard provides no information as to whether the product may be used without restricti
19、on in any ofthe Member States of the EU or EFTA ;2) It should be noted that, while awaiting the adoption of verifiable European criteria, existing nationalregulations concerning the use and/or the characteristics of this product remain in force.SANS 52876:2008This s tandard may only be used and prin
20、ted by approved subscription and freemailing clients of the SABS .Page 5EN 12876:20001 ScopeThis European Standard is applicable to oxygen used for treatment of water intended for human consumption. Itdescribes the characteristics of oxygen and specifies the requirements and the corresponding test m
21、ethods foroxygen. It gives information on its use in water treatment.2 Normative referenceThis European Standard incorporates by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed h
22、ereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references the latest edition of thepublication referred to applies.EN 1089-3, Transportable gas cylinde
23、r Cylinder identification Part 3 : Colour coding.3 Description3.1 Identification3.1.1 Chemical nameOxygen.3.1.2 Synonym or common nameNone.3.1.3 Relative molecular mass32,003.1.4 Empirical formulaO23.1.5 Chemical formulaO = O3.1.6 CAS Registry Number1)7782-44-7.3.1.7 EINECS reference2)231-956-9.3.2
24、Commercial formsGas or cryogenic liquid.1) Chemical Abstract Service Registry Number.2) European Inventory of Existing Commercial Chemical Substances.SANS 52876:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 6EN 12876:20003.3 Physic
25、al properties3.3.1 Appearance, odour and tasteThe product is a colourless, odourless, tasteless gas or a bluish liquid.3.3.2 DensityLiquid : 1,141 g/mlat -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 in pure water at 101,3 kPa 3) (pressure
26、of the equilibrating gas phase) is :61 mg/l at 5 C ;45 mg/l at 15 C ;36 mg/l at 25 C.3.3.4 Vapour pressureOxygen is a gas at NTP (Normal Temperature Pressure, 273 K and 101,3 kPa).3.3.5 Boiling point at 100 kPa3)- 182,97 C.3.3.6 Melting pointNot applicable.3.3.7 Specific heatAt a constant pressure 1
27、00 kPa :919 J/(kgxK) at 15 C ;920 J/(kgxK) at 25 C.3.3.8 Viscosity (dynamic)2,0720 x 10-2 mPaxs at 100 kPa and 27 C.3.3.9 Critical temperature- 118,6 C.3.3.10 Critical pressure5 043 kPa.3) 100 kPa = 1 bar.SANS 52876:2008This s tandard may only be used and printed by approved subscription and freemai
28、ling clients of the SABS .Page 7EN 12876:20003.3.11 Physical hardnessNot applicable.3.4 Chemical propertiesOxygen is an oxidizing agent and a supporter of combustion. Dangerous reactions are possible with organiccompounds and other combustible substances.NOTE Oxygen-rich atmospheres (higher than 25
29、% (V/V) of oxygen) increase the rate of combustion which can lead toexplosive reactions.4 Purity criteriaLimits have been given for impurities and toxic substances where these are likely to be present in significantquantities from the current production process and raw materials. If a change in the
30、production process or rawmaterials leads to significant quantities of other impurities or by-products being present, this shall be notified to theuser.4.1 Composition of commercial productTwo grades of oxygen exist varying from the manufacturing process :Grade A for cryogenically derived oxygen, the
31、 minimum concentration of oxygen shall be 99,5 % (V/V).Grade B for oxygen manufactured with non cryogenic methods, the minimum concentration of oxygen shall be90 % (V/V).4.2 Impurities and main by-productsThe hydrocarbons content (as Methane Index ) shall not exceed 50 ppm (V/V)NOTE Depending on the
32、 production route, the product can contain quantities of water, nitrogen, argon, carbon dioxide andother rare gases which do not affect its use in water treatment.4.3 Toxic substancesNOTE For the purpose of this standard, “toxic substances“ are those defined in the EU Directive 80/778/EEC of15 July
33、1980 (see 1).Commercial oxygen does not contain significant levels of toxic substances.5 Test methods5.1 SamplingAll or part of the gas flow is sent through the analyzer. Sample in a volumetric pipette of a few litres with apositive pressure from 150 kPa to 200 kPa or with an automatic sampler.When
34、sampling gaseous oxygen the following shall apply :sample lines and ancillary equipment shall be compatible with use with oxygen, be clean, leak tight and havethe appropriate pressure rating to deliver the sample safely to the analyzer ;ensure that the gas admitted to the analyzer is representative
35、of the bulk sample and that sample pressuresand flow rates comply with the analyzer manufacturers recommended operating procedures.NOTE Flow rates to the analyzer can require precise control, following pressure regulation, if automatic flow controldevices are not an integral part of the measurement
36、system.SANS 52876:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 8EN 12876:20005.2 Analyses5.2.1 Main product5.2.1.1 GeneralThe most commonly used method of oxygen content measurement is the paramagnetic method. This method hasan ac
37、curacy of 0,01 % (V/V).5.2.1.2 PrincipleMagneto-dynamic oxygen analyzers are based on Faradays principle of determining the magnetic susceptibility ofa gas by measuring the force developed by a strong non-uniform magnetic field on a diamagnetic test bodysuspended in the sample gas. The test body of
38、all measuring cells in paramagnetic oxygen analyzers consists oftwo nitrogen-filled quartz spheres arranged in the form of a dumb-bell, as shown in figure 1. A single turn of fineplatinum wire (the feedback coil) is secured in place around the dumb-bell. A rugged, taut band platinum ribbonsuspension
39、 attached to the mid-point of the dumb-bell positions the dumb-bell in the strong non-uniform magneticfield existing between the specially shaped pole pieces of the permanent magnetic structure (see figure 2).5.2.1.3 ApparatusA variety of analytical equipment suppliers provide simple, ready to run p
40、ortable units for this purpose, which maybe powered either by battery or mains electricity.Figure 3 illustrates the configuration of a typical analyser designed for this purpose.Key1 Force in sphere2 Restoring force of suspensionFigure 1 Dumb-bell system : Forces within the cellSANS 52876:2008This s
41、 tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 9EN 12876:20005.2.1.4 CalibrationCalibration of these analyzers shall be carried out using a calibration gas of purity 99,95 % oxygen and themanufacturers instructions, and conveyed to the analys
42、er in accordance with 5.1.5.2.1.5 ProcedureAfter calibrating the analyzer, introduce the sample of the product in accordance with the manufacturersinstructions, and 5.1. Record the oxygen content that is displayed by the analyzer.Key1 Pole piece2 Dumb-bell3 Platinum wire4 Pole piece5 magnetic FieldF
43、igure 2 Measuring cell configurationSANS 52876:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 10EN 12876:2000Key1 Dumb-bell systemFigure 3 Typical analyzer configuration (electronic)5.2.2 ImpuritiesThe content of hydrocarbons (as Me
44、thane Index) shall be determined in accordance with the method given inannex C.6 Labelling - Transportation - Storage6.1 Means of deliveryGas : Gaseous oxygen is pressurized in cylinders up to 14,7 x 103kPa to 30 x 103kPa ;liquefied : Oxygen is kept at - 183 C in cryogenic insulated tanks .6.2 Risk
45、and safety labelling according to the EU rules4)The following labelling requirements shall apply to oxygen.Liquid oxygen and gas (EEC N 008 001-00-8).Symbols and indications of danger :O : OxidizingNature of special risks attributed to dangerous substances :R8 : Contact with combustible material may
46、 cause fire.4)See 2SANS 52876:2008This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .Page 11EN 12876:2000Safety advice concerning dangerous substances :S17 : Keep away from combustible material.6.3 Transportation regulations and labellingOxygen
47、is listed as UN Number5)1072 (gas) and 1073 (liquid).RID6)/ADR7): Class 2, item 1 (for the pressurized gas) and item 3 (for the refrigerated liquid).IMDG8): Class 2, label 2,5.IATA9): Class 2 for the gas (liquefied : Transportation non permitted).6.4 MarkingThe marking shall include the following :t
48、he name “oxygen“, trade name and grade ;identification of the container for the pressurized gas in accordance with EN 1089-3 and for the refrigeratedliquid in accordance with transport regulations ;the name and the address of supplier and/or manufacturer ;the statement “this product conforms to EN 1
49、2876, grade “.6.5 StorageThe full or empty containers (pressurized cylinders or liquid tanks) shall be stored in protected areas and notexposed to temperature above 50 C.6.5.1 Long term stabilityStable.6.5.2 Storage incompatibilitiesKeep away from flammable materials. Avoid all sources of ignition ; do not smoke nearby. Store only in theoriginal containers conforming to current regulations and never transfer oxygen from one container to another.WARNING Do not lubricate the taps, valves and pressure relief valves with organic greases.5)Un
