1、BRITISH STANDARDBS EN 15469:2007Petroleum products Test method for free water in liquefied petroleum gas by visual inspectionThe European Standard EN 15469:2007 has the status of a British StandardICS 75.160.30g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g
2、50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 15469:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2007 BSI 2007ISBN 978 0 580 56655 4National forewordThis
3、 British Standard is the UK implementation of EN 15469:2007.The UK participation in its preparation was entrusted to Technical Committee PTI/15, Natural gas and gas analysis.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not pu
4、rport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN
5、15469November 2007ICS 75.160.20English VersionPetroleum products - Test method for free water in liquefiedpetroleum gas by visual inspectionProduits ptroliers - Dtermination de leau libre dans lesgaz de ptrole liqufis par inspection visuelleMinerallerzeugnisse - Bestimmung von freiem Wasser inFlssig
6、gas durch visuelle BegutachtungThis European Standard was approved by CEN on 7 October 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date l
7、ists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the resp
8、onsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Icel
9、and, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stas
10、sart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15469:2007: EEN 15469:2007 (E) 2 Contents Page Foreword3 1 Scope 4 2 Terms and definitions .4 3 Principle4 4 Significance and use .4 5 Apparatus .4 6 Prepa
11、ration of apparatus 5 7 Procedure .5 7.1 Introduction of the Sample .5 7.2 Testing 5 8 Report .6 9 Precision.6 Bibliography 7 EN 15469:2007 (E) 3 Foreword This document (EN 15469:2007) has been prepared by Technical Committee CEN/TC 19 “Gaseous and liquid fuels, lubricants and related products of pe
12、troleum, synthetic and biological origin”, the secretariat of which is held by NEN. 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 May 2008, and conflicting national standards shall be withdrawn
13、at the latest by May 2008. 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. According to the CEN/CENELEC Internal Regulations, the nati
14、onal standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
15、Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 15469:2007 (E) 4 1 Scope This test method covers the use of a pressure cylinder to determine the presence of free water in liquefied petroleum gas (LPG) by visual inspection below 0 C. 2 Terms and de
16、finitions For the purposes of this European Standard, the following term and definition applies. 2.1 liquefied petroleum gases (LPG) petroleum gas, which can be stored and/or handled in the liquid phase under moderate conditions of pressure and at ambient temperature, consisting predominantly of pro
17、pane, butanes, with small proportions of propene, butenes and pentanes/pentenes 3 Principle An LPG sample is transferred into a pressure transparent cylinder filled to 50 % of its capacity. The sample is left below 0 C for not less than 1 h; then it is observed for the presence of ice lumps. The res
18、ults of the test shall be shown as pass, if ice is not present, or fail, if ice is present. The LPG sample, containing dissolved water and/or free water, in condition of saturated vapour pressure and above 0 C, is clear and does not become cloudy, which makes it difficult to distinguish the two liqu
19、id phases. Indeed, as both LPG and water are colourless, it is rather difficult to locate the separation surface between the two liquids at laboratory temperature, and it is only by using a transparent container and under optimal lighting conditions that it could be realised. Alternatively, since ic
20、e is far less transparent than water and can be better observed, the visibility of the water can be improved if it is frozen. 4 Significance and use The test is used to detect liquid water transported with LPGs. Excess water content in LPGs can cause corrosive conditions degrading equipments. It can
21、 also separate and freeze, causing blockages of valves, pumps and regulators. 5 Apparatus 5.1 The sample cylinder will be fitted, preferably with a bottom valve, the stem of which will be short enough so as not to retain possible free water during the transfer of the sample to the test cylinder (5.2
22、). If it is not possible to get such an equipment, use a classical sample cylinder with procedure 7.1.2. 5.2 The test cylinder will be a transparent container with a capacity of 250 ml and suitable for the pressure of the product to be tested with a suitable thermometer in contact with the liquid to
23、 be tested. It is fitted with a bottom valve and a top vent valve. NOTE A transparent container made of plastic or glass as described in test method EN ISO 3993 1 or any other transparent LPG container provided of a bottom and a top vent valve may be used. 5.3 A freezer capable of easily maintaining
24、 a temperature below 0 C. NOTE A cooling bath is not appropriate to perform this test method. EN 15469:2007 (E) 5 6 Preparation of apparatus Before cleaning, the test cylinder (5.2) will be discharged from the previous LPG sample by removing the liquid phase, rather than the vapour phase, to prevent
25、 there being any residual residue left from the LPG on the walls. The test cylinder (5.2) is carefully cleaned with a suitable solvent (for instance ethanol, or isopropanol), dried with nitrogen or dry air. The nitrogen or dry air is then removed by applying a vacuum to the cylinder. The vacuum is r
26、eleased by introducing dry vaporized butane into the test cylinder. The test cylinder is closed and stored in dry conditions before use. It shall not be suspected to retain some liquid (water or solvent) inside the bottom valve. 7 Procedure 7.1 Introduction of the Sample 7.1.1 Leave the test cylinde
27、r in the freezer (5.3) for at least 30 min before transferring the sample to the test cylinder. 7.1.2 If there is a possibility, due to the shape of the stem of the bottom (outlet) valve of the sampling cylinder, that liquid water already decanted could stay in it, then vigorously shake the sample f
28、or dispersing water droplets in the liquid. 7.1.3 Immediately connect the bottom valve of the sample cylinder (standing vertically), containing the product to be tested, to the inlet valve of the test cylinder by suitable tubing and fittings. The tubing will have a small diameter, in order not to in
29、troduce too much air in the test cylinder. Ascertain that these connections are free from leaks. Open the sample cylinder bottom valve. 7.1.4 Open the test cylinder inlet valve and allow the product to flow inside it. If necessary, slightly open the vent valve of the test cylinder. Fill the test cyl
30、inder to approximately 50 % of its capacity. 7.1.5 Close all valves and disconnect the test cylinder from the sample cylinder. 7.1.6 With all valves closed, examine the test cylinder for leaks; if leaks are detected, discard the sample and repeat the sampling with a repaired test cylinder. 7.2 Testi
31、ng 7.2.1 Place the test cylinder, filled with the sample as specified in 7.1, horizontally in the freezer (5.3) for not less than 1 h. NOTE More time than 1 h may be required to cool the sample depending on the mass of the test cylinder and the quantity of product to be cooled. 7.2.2 Remove the test
32、 cylinder from the freezer, make sure that the temperature is below 0 C and immediately observe the liquid to see if small ice lumps are visible at the lower generatrix or at the bottom of the test cylinder. 7.2.3 Because of air humidity, the external walls of the cylinder could be rapidly covered w
33、ith a frozen layer of moisture making it impossible to observe the content. If so, wipe the ice off as fast as possible and observe again. 7.2.4 Record any presence of ice. EN 15469:2007 (E) 6 NOTE As self-training for the operator, it can be useful to simulate a failed test by adding 1 ml of water
34、into the test cylinder and then follow the entire test procedure. In this condition it is certain that the ice lumps will appear and they will be easily distinguished; so the test performer will be aware of what he/she is looking for. Perform the same test by introducing 1 ml of water in the sample
35、cylinder, in order to check whether water contained in the sample cylinder is not trapped. 8 Report The results of the test shall be shown as pass, if ice is absent, or fail, if ice is present. 9 Precision It is not practicable to specify the precision of the procedure because the test is a pass - f
36、ail test, not a quantitative measurement. EN 15469:2007 (E) 7 Bibliography 1 EN ISO 3993, Liquefied petroleum gas and light hydrocarbons - Determination of density or relative density- Pressure hydrometer method (ISO 3993:1984). 2 EN ISO 4257, Liquefied petroleum gases - Method of sampling (ISO 4257
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