SIST EN 14129:2005
(Main)Pressure relief valves for LPG tanks
Pressure relief valves for LPG tanks
This document specifies the requirements for the design and testing of spring loaded pressure relief valves and thermal expansion valves for use in:
- static LPG tanks,
NOTE The tanks can be situated above ground, underground or mounded.
- LPG tanks on road tankers, rail tankers, tank-containers or demountable tanks.
This document does not address production testing.
Normative annex B prescribes testing with conditioning at - 40 °C for valves for use under extreme low temperature conditions.
The requirements for pressure relief valve accessories such as isolating devices, manifolds and vent pipes are specified in prEN 14071.
prEN 14570 identifies the requirements for the pressure relief valve capacities for static tanks. See EN 12252 for road tankers.
Sicherheitsventile für Flüssiggas-Behälter
Dieses Dokument legt die Anforderungen an die Konstruktion, Herstellung, Prüfung und Inspektion für federbelastete Sicherheitsventile und Wärmeausdehnungsventile fest, die in
- ortsfesten Flüssiggas-Behältern,
ANMERKUNG Die Behälter können oberirdisch, unterirdisch oder erdüberdeckt aufgestellt werden.
- Flüssiggas-Behältern auf Tankwagen, Schienenfahrzeugen, Tankcontainern oder abnehmbaren Tanks
eingebaut werden.
Dieses Dokument gilt nicht für die Fertigungsprüfung.
Der normative Anhang B beschreibt die Prüfung bei - 40 °C an Ventilen für die Anwendung unter sehr niedrigen Temperaturbedingungen.
Die Anforderungen an Zusatzeinrichtungen wie Schließeinrichtungen, Ventilverteiler und Abblasleitungen für Sicherheitsventile sind in prEN 14071 festgelegt.
prEN 14570 enthält die Anforderungen an das Fassungsvermögen von Sicherheitsventilen für ortsfeste Flüssiggas-Behälter. Siehe EN 12252 für Straßentankwagen.
Soupapes de sécurité pour réservoirs de GPL
Le présent document spécifie les exigences pour la conception et les essais des soupapes de sécurité et des clapets d'expansion thermique a ressort pour utilisation sur :
- des réservoirs de GPL fixes ;
NOTE Les réservoirs peuvent etre aériens, enterrés ou sous talus.
- des citernes de GPL de véhicules-citernes, de wagons-citernes, des conteneurs citernes ou des citernes démontables.
Le présent document ne traite pas des essais en cours de fabrication.
L'Annexe B, normative, stipule des essais avec un conditionnement a - 40 °C pour des soupapes destinées a etre utilisées dans des conditions de températures extremement basses.
Les exigences concernant les accessoires des soupapes de sécurité, tels que les dispositifs d'isolement, les collecteurs et les tuyauteries d'échappement sont spécifiées dans le prEN 14071.
Le prEN 14570 identifie les exigences relatives a la capacité des soupapes de sécurité destinées aux réservoirs fixes. Pour les véhicules-citernes, voir l'EN 12252.
Varnostni ventili za rezervoarje za utekočinjeni naftni plin (UNP)
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Pressure relief valves for LPG tanksSoupapes de sécurité pour réservoirs de GPLSicherheitsventile für Flüssiggas-BehälterTa slovenski standard je istoveten z:EN 14129:2004SIST EN 14129:2005en23.060.40ICS:SLOVENSKI
STANDARDSIST EN 14129:200501-januar-2005
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14129October 2004ICS 23.060.40 English versionPressure relief valves for LPG tanksSoupapes de sûreté pour réservoirs de GPLSicherheitsventile für Flüssiggas-BehälterThis European Standard was approved by CEN on 23 August 2004.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 Central Secretariat 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 Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, 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.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14129:2004: E
EN 14129:2004 (E) 2 Contents Page Foreword.3 1 Scope.4 2 Normative references.4 3 Terms and definitions.5 4 Operating conditions.8 5 Materials.8 5.1 General.8 5.2 Metallic materials.9 5.3 Non-metallic components.9 5.4 Lubricants, sealants, and adhesives.9 5.5 Certification.9 6 Design.10 6.1 Introduction.10 6.2 Design parameters.10 6.3 Threads.10 6.4 Springs.11 6.5 Other requirements.11 6.6 Pressure relief valve with parallel thread.11 7 Testing of the design.12 7.1 General.12 7.2 Hydraulic proof test.12 7.3 Overtorquing test.12 7.4 Operating and flow characteristics.13 7.4.1 General.13 7.4.2 Operation test.13 7.4.3 Flow characteristics test.13 7.4.4 Reseal pressure.13 7.4.5 Blowdown.13 8 Marking.14 8.1 Pressure relief valves.14 8.2 Thermal expansion valves.14 9 Operating instructions.14 Annex A (Informative)
Terms used with LPG pressure relief valves.16 Annex B (Normative)
Special low temperature requirements for valves.17 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC.18 Bibliography.19
EN 14129:2004 (E) 3 Foreword This document (EN 14129:2004) has been prepared by Technical Committee CEN/TC 286 “Liquefied Petroleum Gas 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 or by endorsement, at the latest by April 2005, and conflicting national standards shall be withdrawn at the latest by April 2005. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 97/23/EC. For relationship with EU Directive, see informative annex ZA, which is an integral part of this document. This European Standard has been submitted for reference into the technical annexes of the European Agreement concerning the international carriage of dangerous goods by road (ADR). 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, Denmark, 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.
EN 14129:2004 (E) 4 1 Scope This document specifies the requirements for the design and testing of spring loaded pressure relief valves and thermal expansion valves for use in: static LPG tanks, NOTE The tanks can be situated above ground, underground or mounded. LPG tanks on road tankers, rail tankers, tank-containers or demountable tanks. This document does not address production testing. Normative annex B prescribes testing with conditioning at – 40 °C for valves for use under extreme low temperature conditions. The requirements for pressure relief valve accessories such as isolating devices, manifolds and vent pipes are specified in prEN 14071. prEN 14570 identifies the requirements for the pressure relief valve capacities for static tanks. See EN 12252 for road tankers. 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 references, the latest edition of the referenced document (including any amendments) applies. EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment. EN 1092-1, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges. EN 1503-1, Valves - Materials for bodies, bonnets and covers - Part 1: Steels specified in European Standards. EN 1503-2, Valves - Materials for bodies, bonnets and covers - Part 2: Steels other than those specified in European Standards. EN 1503-3, Valves - Materials for bodies, bonnets and covers - Part 3:Cast irons specified in European Standards. EN 1503-4, Valves - Materials for bodies, bonnets and covers - Part 4:Copper alloys specified in European Standards. EN 1563, Founding – Spheroidal graphite cast irons. EN 10088-1, Stainless steels - Part 1: List of stainless steels EN 10088-3, Stainless steels - Part 3: Technical delivery conditions for semi-finished products, bars, rods andsections for general purposes EN 10204:2004, Metallic products — Type of inspection documents. EN 12165, Copper and copper alloys - Wrought and unwrought forging stock
EN 14129:2004 (E) 5 EN 12420, Copper and copper alloy – Forgings. EN 13906 (all parts), Cylindrical helical springs made from round wire and bar –Calculation and design
prEN 14071, Pressure relief valves for LPG tanks – Ancillary equipment ISO 7-1, Pipe threads where pressure-tight joints are made on the threads -- Part 1: Dimensions, tolerances and designation. ANSI/ASME B1.20.1 – 1983, Pipe threads, general purpose (inch) issued by American National Standards
Institute on 1983. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 pressure relief valve self-closing valve which automatically, without the assistance of any energy other than that of the vapour concerned, discharges vapour at a predetermined pressure, and operates with a pop action
3.2 thermal expansion valve self-closing valve which automatically, without the assistance of any energy other than that of the fluid concerned, discharges fluid at a predetermined pressure
3.3 spring loaded pressure relief valve valve in which the loading due to the vapour pressure underneath the sealing element is opposed only by the force of a spring 3.4 external pressure relief valve pressure relief valve which when fitted to the LPG tank has the spring external to the pressure envelope (see figure 1)
Figure 1 — External pressure relief valve 3.5 internal pressure relief valve pressure relief valve which when fitted to the LPG tank has the spring internal to the pressure envelope
EN 14129:2004 (E) 6 3.5.1 semi-Internal pressure relief valve internal pressure relief valve in which some of the working parts and the wrenching section are outside the pressure envelope (see Figure 2)
Figure 2 — Semi-internal pressure relief valve 3.5.2 fully internal pressure relief valves internal pressure relief valve in which all the working parts and the wrenching section are recessed and within the profile of the tank (see Figure 3)
Figure 3 — Fully internal pressure relief valve 3.6 pressure/flow terms NOTE 1 Terms used with LPG pressure relief valves are described graphically in Annex A. NOTE 2 All pressures are gauge pressures unless otherwise specified.
EN 14129:2004 (E) 7 3.6.1 nominal set pressure predetermined pressure of the pressure relief valve at which the valve is set to start to discharge 3.6.2 start to discharge pressure inlet pressure at which the first of a stream of bubbles appears at the outlet of a pressure relief valve through a water seal of not more than 50 mm water column, or other equivalent method 3.6.3 overpressure pressure increase between the nominal set pressure and the flow rating pressure, usually expressed as a percentage of nominal set pressure 3.6.4 reseal pressure inlet pressure at which leakage ceases through a water seal of not more than 50 mm water column on the outlet of the valve, after the valve has been subjected to a pressure equal to or above the start to discharge pressure but below the "pop" pressure 3.6.5 reseat pressure inlet pressure at which the sealing element effects a seal with the valve seat after the valve has been subjected to pop action 3.6.6 flow rating pressure inlet pressure at which the discharge capacity is measured 3.6.7 maximum allowable pressure maximum pressure for which the valve is designed, as specified by the manufacturer 3.7 blowdown difference between start to discharge and reseat pressures, usually expressed as a percentage of the nominal set pressure 3.8 discharge capacity capacity at the flow rating pressure of a pressure relief valve expressed in cubic metres per minute of free air at STP 3.9 pop action rapid opening of the valve sealing element to achieve full lift, resulting from an increase of inlet pressure creating a sudden increase in force and compression of the spring 3.10 sealing element non-metallic moveable resilient component which effects a seal by contact with the pressure relief valve seat 3.11 valve seat normally raised area of the pressure relief valve body on to which the sealing element effects the seal
EN 14129:2004 (E) 8 3.12 pressure relief valve isolating device device fitted between the storage tank and an external pressure relief valve, which permits replacement of the pressure relief valve without depressurising the tank 3.13 manifold device fitted to a storage tank permitting two or more pressure relief valves to be fitted, only one of which can be isolated at a time, which permits replacement of the isolated pressure relief valve without depressurising the tank 3.14 LPG mixture of light hydrocarbons, gaseous under normal atmospheric conditions which can be liquefied by increased pressure or decreased temperature. The main components are propane, propene, butane and butene isomers 3.15 leak tightness resistance to leakage to atmosphere across the valve seat or any other pressure containing component when the valve is closed 3.16 STP Standard Temperature and Pressure [15,6 °C (288,7 K), 1,013 bar absolute (0,1013 MPa absolute)] 4 Operating conditions Valves designed in accordance with this standard shall be suitable for the following conditions: The minimum operating temperature to which the valve is expected to be exposed during normal use is minus 20 °C. Temperatures below this may be encountered during short periods, for example, during discharge. In some parts of Europe, and for certain applications, lower minimum operating temperatures are encountered. When equipment is designed for a temperature lower than minus 20 °C, it shall meet the requirements of Annex B. The maximum operating temperature to which the valve is expected to be exposed during normal operation is 65 °C.
The minimum pressure to which a valve or fitting is normally exposed is 0 bar. Vacuum conditions on the valve, arising from butane at low temperature or evacuation of the tank can expose the valve or fitting to a vacuum of 50 mbar absolute. 5 Materials 5.1 General 5.1.1 All materials in contact with LPG shall be physically and chemically compatible with LPG under all normal operating conditions for which the valve is intended to be used. 5.1.2 Material for components shall be selected for adequate strength in service. The mater
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.