SIST EN 13953:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sicherheitsventile für ortsbewegliche, wiederbefüllbare Flaschen für Flüssiggas (LPG)Soupapes de sureté des bouteilles transportables et rechargeables pour gaz de pétrole liquéfiés (GPL)Pressure relief valves for transportable refillable cylinders for Liquefied Petroleum Gas (LPG)23.060.40Pressure regulators23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN 13953:2003SIST EN 13953:2003en01-december-2003SIST EN 13953:2003SLOVENSKI
STANDARD



SIST EN 13953:2003



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13953May 2003ICS 23.060.40English versionPressure relief valves for transportable refillable cylinders forLiquefied Petroleum Gas (LPG)Soupapes de sûreté des bouteilles transportables etrechargeables pour gaz de pétrole liquéfiés (GPL)Sicherheitsventile für ortsbewegliche, wiederbefüllbareFlaschen für Flüssiggas (LPG)This European Standard was approved by CEN on 21 April 2003.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 lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and UnitedKingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2003 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13953:2003 ESIST EN 13953:2003



EN 13953:2003 (E)2ContentsPageForeword.31Scope.42Normative references.43Terms, definitions and abbreviations.43.1Terms and definitions.43.2Abbreviations.64Operating temperatures.65Materials.65.1General.65.2Metallic materials.65.3Non-metallic components.75.4Lubricants, sealants and adhesives.76Design.76.1General.76.2Threads.76.3Springs.86.4Test requirements.87Testing and inspection of the design.87.1General.87.2Hydraulic proof test.87.3Start to discharge and discharge capacity test.97.4Leak test.97.5Test records.97.6Design changes.108Production testing.109Marking.1010Documentation.10Annex A (informative)
Terms used with pressure relief valves.11Annex B (normative)
Special low temperature requirements for valves.12Annex C (informative)
Sizing of pressure relief valves for LPG cylinders.13Annex D (informative)
Production testing.14D.1General.14D.2Dimensional inspection.14D.3Setting and leak testing of pressure relief valves.14Bibliography.15SIST EN 13953:2003



EN 13953:2003 (E)3ForewordThis document (EN 13953:2003) has been prepared by Technical Committee CEN/TC 286 "Liquefied petroleumgas equipment and accessories", the secretariat of which is held by NSAI.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by November 2003, and conflicting national standards shall be withdrawn at the latestby November 2003.Annexes A, C and D are informative, Annex B is normative.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,Slovakia, Spain, Sweden, Switzerland and the United Kingdom.SIST EN 13953:2003



EN 13953:2003 (E)41 ScopeThis European Standard specifies the design, testing and marking requirements for spring loaded pressure reliefvalves, for use in liquefied petroleum gas (LPG) cylinders.These valves can be either an integral part of a cylinder valve (see EN 13152 and EN 13153) or a separate device.This European Standard does not exclude the use of other designs of pressure relief devices that provide a similarlevel of safety.2 Normative referencesThis 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 hereafter. 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 (including amendments).EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment.EN 751 (all parts), Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hotwater.EN 837-1, Pressure gauges - Part 1: Bourdon tube pressure gauges - Dimensions, metrology, requirements andtesting.EN 1563, Founding – Spheroidal graphite cast irons.EN 10270-3, Steel wire for mechanical springs - Part 3: Stainless spring steel wire.EN 12164, Copper and copper alloys
– Rod for free machining purposes.EN 12420, Copper and copper alloys – Forgings.EN 13906-1, Cylindrical helical springs made from round wire and bar – Calculation and design - Part 1:Compression springs.3 Terms, definitions and abbreviations3.1 Terms and definitionsFor the purposes of this European Standard, the following terms and definitions apply:3.1.1LPGmixture of light hydrocarbons, gaseous under standard atmospheric conditions, which can be liquefied by increasedpressure or decreased temperature. The main components are propane, propene, butane and butene isomers3.1.2pressure relief valvevalve which automatically, without the assistance of any energy other than that of the fluid concerned, discharges aquantity of fluid so as to prevent a predetermined safe pressure being exceeded, and which is designed to re-closeand prevent the further flow of fluid after normal pressure conditions of service have been restored. The loadingdue to the fluid pressure underneath the valve-sealing element is opposed by a springSIST EN 13953:2003



EN 13953:2003 (E)53.1.3pressure/flow termsNOTE 1Terms used with LPG pressure relief valves are described graphically in annex A.NOTE 2All pressures are gauge pressures unless otherwise specified.3.1.3.1nominal set pressurepredetermined pressure of the pressure relief valve at which the valve is set to start to discharge3.1.3.2start to discharge pressureinlet pressure at which the first of a stream of bubbles appears at the outlet of a pressure relief valve through awater seal of not more than 50 mm water column, or other equivalent method3.1.3.3pop actionrapid opening of the valve sealing element to achieve full lift, resulting from an increase of inlet pressure creating asudden increase in force and compression of the spring3.1.3.4overpressurepressure range between the nominal set pressure and the flow rating pressure3.1.3.5re-seat pressureinlet pressure at which the sealing element effects a seal with the valve seat after the valve has been subjected topop action3.1.3.6flow rating pressureinlet pressure at which the discharge capacity is measured3.1.4nominal discharge capacityminimum discharge capacity at the flow rating pressure expressed in cubic metres per minute of free air at STProunded down to one decimal place3.1.5discharge capacitycapacity at the flow rating pressure of a pressure relief valve expressed in cubic metres per minute of free air atSTP3.1.6sealing elementnon-metallic resilient component which effects the seal by contact with the pressure relief valve seat3.1.7valve seatnormally raised area of the pressure relief valve body on to which the sealing element effects a seal3.1.8cylinder valvevalve fitted to transportable refillable LPG cylinders from 0,5 l up to 150 l water capacity intended to convey LPGonly3.1.9leak tightnessresistance to leakage to atmosphere across the valve seat or any other pressure containing component when thevalve is closedSIST EN 13953:2003



EN 13953:2003 (E)63.2 AbbreviationsSTPStandard Temperature and Pressure [15,6 °C (288,7 K), 1,013 bar absolute (0,1013 MPa absolute)]4 Operating temperaturesValves designed in accordance with this European Standard shall be suitable for: a minimum operating temperature of - 20 °C in service. Temperatures below this are acceptable for shortperiods for example, when filling; a minimum operating temperature of
- 40 °C for those parts of Europe where valves are subject to moresevere temperature conditions. The material and design shall be shown to be satisfactory for operations underthese conditions and shall meet the requirements of annex B; a maximum operating temperature
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