1、BRITISH STANDARD BS EN ISO 15996:2005 +A1:2007 Gas cylinders Residual pressure valves General requirements and type testing ICS 23.020.30 BS EN ISO 15996:2005+A1:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 24 May 2005 BSI 2008 ISBN 9
2、78 0 580 62334 9 National foreword This British Standard is the UK implementation of EN ISO 15996:2005+A1:2007. It is identical with ISO 15996:2005, incorporating amendment 1:2007. It supersedes BS EN ISO 15996:2005 which is withdrawn. The start and finish of text introduced or altered by amendment
3、is indicated in the text by tags. Tags indicating changes to ISO text carry the number of the ISO amendment. For example, text altered by ISO amendment 1 is indicated by ! “. The UK participation in its preparation was entrusted by Technical Committee PVE/3, Gas containers, to Subcommittee PVE/3/1,
4、Valve fittings for gas containers. A list of organizations represented on this subcommittee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a Briti
5、sh Standard cannot confer immunity from legal obligations. Amendments/corrigenda issued since publication Date Comments 30 May 2008 Implementation of ISO amendment 1:2007 with CEN endorsement A1:2007EUROPEANSTANDARD NORMEEUROPENNE EUROPISCHENORM ENISO15996:2005+A1 December 2007 ICS23.020.30 Englishv
6、ersion GascylindersResidualpressurevalvesGeneral requirementsandtypetesting(ISO15996:2005) BouteillesgazRobinetspressionrsiduelle Exigencesgnralesetessaisdetype(ISO15996:2005) GasflaschenRestdruckventileAllgemeine AnforderungenundTypprfung(ISO15996:2005) ThisEuropeanStandardwasapprovedbyCENon21March
7、2005. CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEurope an Standardthestatusofanationalstandardwithoutanyalteration.Uptodatelistsandbibliographicalreferencesconcernings uchnational standardsmaybeobtainedonapplicationtotheCentralSecretariato
8、rtoanyCENmember. ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).Aversioninanyotherlanguagemadebytra nslation undertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCentralSecretariathasthesamestatusast heofficial versions. CENmembersarethenationalstandardsbodie
9、sofAustria,Belgium,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France, Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal, Slovakia, Slovenia,Spain,Sweden,SwitzerlandandUnitedKingdom. EUROPEANCOMMITTEEFORSTANDARDIZATION COMITEUROPENDENO
10、RMALISATION EUROPISCHESKOMITEEFRNORMUNG ManagementCentre:ruedeStassart,36B1050Brussels 2005CEN Allrightsofexploitationinanyformandbyanymeansreserved worldwideforCENnationalMembers. Ref.No.ENISO15996:2005:E Foreword This document (EN ISO 15996:2005) has been prepared by Technical Committee ISO/TC 58
11、“Gas cylinders“ in collaboration with Technical Committee CEN/TC 23 “Transportable gas cylinders“, the secretariat of which is held by BSI. 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 October
12、2005, and conflicting national standards shall be withdrawn at the latest by October 2005. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denma
13、rk, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 15996:2005 has been approved by CEN as E
14、N ISO 15996:2005 without any modifications. Foreword to amendment A1 This amendment (EN ISO 15996:2005/A1:2007) has been prepared by Technical Committee ISO/TC 58 “Gas cylinders“ in collaboration with Technical Committee CEN/TC 23 “Transportable gas cylinders” the secretariat of which is held by BSI
15、. This Amendment to the European Standard EN ISO 15996:2005 shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June 2008, and conflicting national standards shall be withdrawn at the latest by June 2008. Attention is drawn
16、 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 national standards organizations of the following
17、 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, Poland, Portugal, Romania, Slovakia, Slovenia
18、, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text of ISO 15996:2005 has been approved by CEN as a EN ISO 15996:2005/A1:2007 without any modification. BS EN ISO 15996:2005+A1:2007 iiiContents Page Foreword iv Introduction v 1 Scope 1 2 Normative references. 1 3 Terms an
19、d definitions. 1 4 Valve requirements. 2 4.1 General. 2 4.2 Description. 2 4.3 Valve outlet geometry. 2 4.4 Performance requirements of the residual pressure device 3 4.4.1 Leakage tightness. 3 4.4.2 Endurance 3 4.4.3 Resistance against reverse over pressure. 3 4.4.4 Resistance to ignition. 3 5 Type
20、 testing. 3 5.1 General. 3 5.2 Documents. 4 5.3 Test valves. 4 5.4 Residual pressure device performance tests 5 5.4.1 General. 5 5.4.2 Leak tightness tests 5 5.4.3 Cycle life test . 5 5.4.4 Resistance test against reverse over-pressure . 5 5.4.5 Oxygen pressure surge test. 5 5.5 Test report 6 Annex
21、A (informative) Various examples of residual pressure valve designs 7 Annex B (informative) Test equipment. 10 B.1 Tightness test equipment for residual pressure valve . 10 B.2 Cycle life test equipment for residual pressure valve. 11 Annex C (informative) Conveyance test. 12 Annex D (informative) I
22、ntegrity under high flow . 13 Bibliography . 15 ENISO15996:2005 iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical
23、 committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with
24、 the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft Intern
25、ational Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may
26、be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 15996 was prepared by Technical Committee ISO/TC 58, Gas cylinders, Subcommittee SC 2, Cylinder fittings. ENISO15996:2005 vIntroduction Gas cylinders are fitted with valves, to conta
27、in and control the discharge of their contents. Increased requirements about avoidance of contamination of gases and gas cylinders has led to the development of gas cylinder valves incorporating residual pressure devices. These devices are designed to maintain a small positive differential pressure
28、between the inlet and the outlet of the cylinder valve. This prevents the gas cylinder from being completely empty in customer use and stops ingress of atmospheric contamination. Many of these devices include a non-return function that protects the cylinder from back flow from downstream processes.
29、BS EN ISO 15996:2005+A1:2007blankINTENRATIONAL TSANDADR IS:69951 O5002(E)1Gas cylinders Residual pressure valves General requirements and type testing 1 Scope This International Standard specifies requirements for residual pressure valves, with or without a non-return function, for gas cylinders and
30、 the methods of testing such valves, for type approval. This International Standard is applicable to valves to be fitted to gas cylinders of up to 150 l water capacity, intended to contain compressed, liquefied or dissolved gases. This International Standard does not cover valves for fire extinguish
31、ers, cryogenic equipment or liquefied petroleum gas. These requirements are in addition to those laid down in ISO 10297. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated
32、 references, the latest edition of the referenced document (including any amendments) applies. ISO 10156, Gases and gas mixtures Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets 3 Terms and definitions For the purposes of this document the following t
33、erms and definitions apply. 3.1 working pressure p wsettled pressure, at a uniform temperature of 15 C, for a full gas cylinder 3.2 valve test pressure p vtfor compressed gases p vt= 1,2 p wand for liquefied gases and dissolved gases under pressure (e.g. acetylene), p vtis greater or equal to the mi
34、nimum test pressure of the cylinder quoted in the relevant transportation regulation for that gas or gas group and filling ratio 3.3 flow direction path taken through the valve by the gas when flowing out of the cylinder through the outlet “ !ISO 10297, Transportable gas cylinders Cylinder valves Sp
35、ecification and type testing. BS EN ISO 15996:2005+A1:20072 3.4 filling direction path taken through the valve by the gas when filling from the outlet into the gas cylinder 3.5 opening pressure differential pressure between upstream and downstream pressures at which the residual pressure device star
36、ts to open NOTE Due to the effects of manufacturing tolerances this is normally expressed as a range of pressures. 3.6 closing off pressure differential pressure between upstream and downstream pressures at which the residual pressure device closes NOTE Due to the effects of manufacturing tolerances
37、 this is normally expressed as a range of pressures. 4 Valve requirements 4.1 General Valves shall operate satisfactorily over the full range of service temperatures, normally from 20 C to + 65 C. The range may be exceeded for short periods (e.g. during filling). Where higher or lower service temper
38、atures are required for longer periods, the purchaser shall specify them accordingly. Valves shall be capable of withstanding the mechanical stresses or chemical attack they may experience during normal service e.g. during storage, valving into cylinders, filling processes, transportation and end us
39、e of the cylinder. Valves shall be cleaned to meet the requirements of the intended service. However, valves to be tested shall be in a condition that the manufacturer intends to supply, prior to any test or test preparation. 4.2 Description There are currently two main types of residual pressure va
40、lves (see Figures A.1 and A.2). The valve shown in Figure A.1 leaves a small positive or residual pressure in the cylinder. The valve shown in Figure A.2 not only leaves a small positive pressure, but also incorporates a non-return function to prevent back-flow into the cylinder from a higher pressu
41、re source. The valve shown in Figure A.2 requires either an adapter or a manual adjustment to overcome the non-return function for filling, whereas the valve shown in Figure A.1 usually does not. Two other schematic designs are shown in Annex A. 4.3 Valve outlet geometry The residual pressure device
42、, if placed in a valve outlet, shall be designed so that it does not interfere with a gas withdrawal connection made in accordance with the relevant national or international standard. The diameter of the gas passage between the valve outlet and the body of the valve is permitted to be larger than i
43、s quoted in the relevant standard provided safety is not compromised. BS EN ISO 15996:2005+A1:2007 34.4 Performance requirements of the residual pressure device 4.4.1 Leakage tightness The leak rate for residual pressure devices shall not exceed 6 cm 3 /h at 20 C and 1 013 mbar when tested at 0,5 ba
44、r and a room temperature normally between 15 C and 30 C. NOTE Leakage rate may vary at extremes of temperature. Therefore it should be considered for acceptability for individual applications. Test details are given in 5.4.2. 4.4.2 Endurance Residual pressure devices shall perform to the manufacture
45、rs specification for opening and closing-off pressures over a life of at least 100 000 cycles. This requirement is in addition to any cycle tests required to satisfy the endurance test specified in ISO 10297, where the cylinder valve is to be tested with the residual pressure device neutralized usin
46、g the manufacturers recommended method or by using a valve not fitted with the residual pressure device. The test cycle is described in 5.4.3. Leakage rate at the end of the test cycle shall not exceed 6 cm 3 /h at 20 C and 1 013 mbar when tested at 0,5 bar and a room temperature normally between 15
47、 C and 30 C. 4.4.3 Resistance against reverse over pressure Where a residual pressure valve incorporates a non-return function, this shall be able to resist a reverse pressure of 1,5 p vt . The test is described in 5.4.4. 4.4.4 Resistance to ignition Residual pressure valves for oxygen and highly ox
48、idizing gases as defined in ISO 10156 shall be subjected to an oxygen pressure surge test in accordance with the requirements of 5.4.5. After the test, valves shall show no evidence of ignition. NOTE In addition, the design should ensure that the valve will resist ignition in normal service conditions, in particular under certain flow conditions vibration (noise) can occur which may be a cause of ignition. 5 Type testing 5.1 General Before valves are introduced into service, they shall be submitted for t
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