EN 12126:2012

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Kemikalije, ki se uporabljajo za pripravo pitne vode - SalmiakProdukte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Ammoniak, flüssigProduits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Ammoniac liquéfiéChemicals used for treatment of water intended for human consumption - Liquefied ammonia71.100.80Chemicals for purification of water13.060.20Pitna vodaDrinking waterICS:Ta slovenski standard je istoveten z:EN 12126:2012SIST EN 12126:2013en,fr,de01-april-2013SIST EN 12126:2013SLOVENSKI
STANDARDSIST EN 12126:20051DGRPHãþD

EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 12126
November 2012 ICS 71.100.80 Supersedes EN 12126:2005English Version
Chemicals used for treatment of water intended for human consumption - Liquefied ammonia
Produits chimiques utilisés pour le traitement de l'eau destinée à la consommation humaine - Ammoniac liquéfié Produkte zur Aufbereitung von Wasser für den menschlichen Gebrauch - Ammoniak, flüssig This European Standard was approved by CEN on 23 September 2012.
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 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 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 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, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR 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 national Members. Ref. No. EN 12126:2012: ESIST EN 12126:2013

General information on liquefied ammonia . 16Annex B (normative)
General rules relating to safety . 17Bibliography . 18 SIST EN 12126:2013

NH3. 3.1.6 CAS Registry Number 1)
7664-41-7.
1) Chemical Abstracts Service Registry Number. SIST EN 12126:2013

231-635-3. 3.2 Commercial form
The product is available as liquefied gas. 3.3 Physical properties 3.3.1 Appearance and odour The product is colourless liquid with a characteristic pungent odour. 3.3.2 Density The density of the gas is 0,771 g/l at 101,3 kPa 3) and 0 °C. The density of the liquid is 0,682 g/ml at 101,3 kPa and -34 °C, and 0,61 g/ml at 850 kPa and 20 °C. 3.3.3 Solubility (in water) The solubility of the product in water is 900 g/l at 0 °C, 520 g/l at 20 °C, and 407 g/l at 30 °C. 3.3.4 Vapour pressure
The vapour pressure of the product is 400 kPa at 0 °C, 850 kPa at 20 °C and 2 035 kPa at 50 °C. 3.3.5 Boiling point at 100 kPa 3) The boiling point of the product is -33,4 °C at 101,3 kPa. 3.3.6 Melting point
The melting point of the product is -77,7 °C at 101,3 kPa. 3.3.7 Specific heat
The specific heat of the product is 4,61 kJ/(kg K) at 0 °C and 4,86 kJ/(kg K) at 40 °C. 3.3.8 Viscosity, dynamic The viscosity of the product is 0,254 mPa.s at 33 °C and 101,3 kPa. 3.3.9 Critical temperature
132,4 °C. 3.3.10 Critical pressure
11 450 kPa.
2) European Inventory of Existing Commercial Chemical Substances. 3) 100 kPa = 1 bar. SIST EN 12126:2013

Not applicable. 3.4 Chemical properties Ammonia reacts violently with halogens, acids, acid halides, acid anhydrides and oxidising agents. It reacts with zinc, copper, tin and their alloys. Mixtures of volume fraction of 15 % to 30 % of ammonia with air are explosive. 4 Purity criteria
4.1 General This European Standard specifies the minimum purity requirements for liquefied ammonia used for the treatment of water intended 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 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 this product standard. Limits have been given for impurities and chemical 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 leads to significant quantities of impurities, by-products or additives being present, this shall be notified to the user. 4.2 Composition of commercial product Liquefied ammonia shall not contain less than a mass fraction of 99,8 % of NH3. 4.3 Impurities and main by-products The product shall conform to the requirements specified in Table 1. Table 1 — Impurities Impurity Limit Water max Mass fraction 0,1 %
Permanent gases and methane max Volume fraction 0,1 %
Oil max
5 mg/kg
4.4 Chemical parameters The ch
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