LPG Equipment and accessories - Pressure relief valves for LPG pressure vessels

This European Standard specifies the requirements for the design and testing of spring loaded pressure relief valves and thermal expansion valves for use in:
- static LPG pressure vessels,
NOTE   The pressure vessels can be situated above ground, underground or mounded.
- LPG pressure vessels 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, changeover manifolds and vent pipes are specified in EN 14071.
EN 14570 identifies the requirements for the pressure relief valve capacities for static pressure vessels.
EN 12252 identifies the requirements for the pressure relief valve capacities for road tankers.
Valves designed in accordance with this standard are specifically for use in LPG applications. Valves manufactured in accordance with EN ISO 4126 1 may also be used in certain LPG applications.
Terms used with LPG pressure relief valves are described graphically in Annex A.

Flüssiggas-Geräte und Ausrüstungsteile - Sicherheitsventile für Druckbehälter für Flüssiggas (LPG)

Diese Europäische Norm legt die Anforderungen an die Auslegung und Prüfung von federbelasteten Sicherheitsventilen und thermischen Ausdehnungsventilen für die folgenden Verwendungen fest:
   ortsfeste Druckbehälter für Flüssiggas,
ANMERKUNG   Die Druckbehälter können oberirdisch, unterirdisch oder mit einem Erdwall bedeckt aufgestellt sein.
   LPG-Druckbehälter auf Straßentankwagen, Eisenbahnkesselwagen, Tankcontainern oder Aufsetztanks.
Dieses Dokument enthält keine Angaben zu Produktionsprüfungen.
Der normative Anhang B beschreibt Prüfungen mit einer Konditionierung bei –40 °C für Ventile für die Verwendung unter extrem niedrigen Temperaturbedingungen.
Die Anforderungen an Ausrüstungen von Sicherheitsventilen, wie z. B. Schließeinrichtungen, Sicherheits-ventilverteiler und Entlüftungsrohre sind in EN 14071 festgelegt.
EN 14570 legt Anforderungen an die Leistung von Sicherheitsventilen für ortsfeste Druckbehälter fest.
EN 12252 legt Anforderungen an die Leistung von Sicherheitsventilen für Straßentankfahrzeuge fest.
Die nach dieser Norm ausgelegten Ventile sind speziell zur Verwendung für Flüssiggasanwendungen vorgesehen. Auch nach EN ISO 4126-1 hergestellte Ventile dürfen für bestimmte Flüssiggasanwendungen verwendet werden.
Die für LPG-Sicherheitsventile verwendeten Begriffe sind graphisch in Anhang A dargestellt.

Équipements pour GPL et leurs accessoires - Soupapes de sécurité pour réservoirs de GPL sous pression

La présente Norme européenne spécifie les exigences pour la conception et les essais des soupapes de sécurité à ressort et des clapets d'expansion thermique destinés à être utilisés dans :
   des réservoirs de GPL sous pression fixes ;
NOTE   Les réservoirs sous pression peuvent être aériens, enterrés ou partiellement enterrés.
   des réservoirs de GPL sous pression des véhicules-citernes, wagons-citernes, conteneurs-citernes ou citernes démontables.
Le présent document ne traite pas des essais de fabrication.
L'Annexe B, normative, spécifie des essais avec un conditionnement à - 40 °C pour des soupapes destinées à être utilisées dans des conditions de températures extrêmement 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 l'EN 14071.
L'EN 14570 identifie les exigences relatives à la capacité des soupapes de sécurité destinées aux réservoirs sous pression fixes.
L’EN 12252 identifie les exigences relatives à la capacité des soupapes de sécurité destinées aux véhicules citernes.
Les soupapes conçues conformément à la présente norme sont spécifiquement destinées à être utilisées dans des applications de GPL. Les soupapes fabriquées conformément à l'EN ISO 4126-1 peuvent également être utilisées dans certaines applications de GPL.
Les termes utilisés pour les soupapes de sécurité pour GPL sont décrits à l'aide d’un schéma en Annexe A.

Oprema in pribor za utekočinjeni naftni plin (UNP) - Varnostni ventili za tlačne posode za utekočinjeni naftni plin (UNP)

EN 14129 določa zahteve za zasnovo in preskušanje vzmetnih varnostnih ventilov in ventilov za toplotni raztezek, ki se uporabljajo v: - statičnih tlačnih posodah za utekočinjeni naftni plin; - tlačnih posodah za utekočinjeni naftni plin na cestnih cisternah, vagonih cisternah, cisternah zabojnikih ali zamenljivih cisternah. Ta dokument ne obravnava preskušanja proizvodnje. Normativna priloga B določa preskušanje s kondicioniranjem pri −40 °C za ventile, ki se uporabljajo pri zelo nizki temperaturi. Zahteve za pripomočke za varnostne ventile, kot so izolirne naprave, menjalni razdelilniki in oddušne cevi, so določene v standardu EN 14071. EN 14570 določa zahteve za zmogljivost varnostnih ventilov za statične tlačne posode. EN 12252 določa zahteve za zmogljivost varnostnih ventilov za cestne cisterne. Ventili, zasnovani v skladu s tem standardom, se uporabljajo posebej za naprave za utekočinjeni naftni plin. Ventili, proizvedeni v skladu z EN ISO 4126-1, se lahko uporabljajo v nekaterih napravah za utekočinjeni naftni plin. Pojmi, ki se uporabljajo za varnostne ventile za utekočinjeni naftni plin (UNP), so opisani v Prilogi A.

General Information

Status
Published
Publication Date
18-Feb-2014
Current Stage
9092 - Decision on results of review/2YR ENQ - revise - Review Enquiry
Completion Date
14-Apr-2020

RELATIONS

Buy Standard

Standard
EN 14129:2014
English language
32 pages
sale 10% off
Preview
sale 10% off
Preview
e-Library read for
1 day

Standards Content (sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flüssiggas-Geräte und Ausrüstungsteile - Sicherheitsventile für Druckbehälter für Flüssiggas (LPG)Équipements pour GPL et leurs accessoires - Soupapes de sécurité pour réservoirs de GPL sous pressionLPG Equipment and accessories - Pressure relief valves for LPG pressure vessels23.060.40Pressure regulators23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN 14129:2014SIST EN 14129:2014en,fr,de01-julij-2014SIST EN 14129:2014SLOVENSKI

STANDARDSIST EN 14129:20051DGRPHãþD
SIST EN 14129:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14129
February 2014 ICS 23.060.40 Supersedes EN 14129:2004English Version
LPG Equipment and accessories - Pressure relief valves for LPG pressure vessels

Équipements pour GPL et leurs accessoires - Soupapes de sécurité pour réservoirs de GPL sous pression

Flüssiggas-Geräte und Ausrüstungsteile - Sicherheitsventile für Druckbehälter für Flüssiggas (LPG) This European Standard was approved by CEN on 30 November 2013.

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
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14129:2014 ESIST EN 14129:2014

EN 14129:2014 (E) 2 Contents Page Foreword ..............................................................................................................................................................4 Introduction .........................................................................................................................................................5 1 Scope ......................................................................................................................................................6 2 Normative references ............................................................................................................................6 3 Terms and definitions ...........................................................................................................................7 4 Operating conditions .......................................................................................................................... 10 5 Materials .............................................................................................................................................. 10 5.1 General ................................................................................................................................................. 10 5.2 Metallic materials ................................................................................................................................ 10 5.3 Non-metallic components .................................................................................................................. 11 5.4 Lubricants, sealants, and adhesives ................................................................................................ 11 5.5 Certification ......................................................................................................................................... 11 6 Design .................................................................................................................................................. 12 6.1 General ................................................................................................................................................. 12 6.2 Design parameters.............................................................................................................................. 13 6.3 Threads ................................................................................................................................................ 14 6.4 Springs ................................................................................................................................................. 14 6.5 Additional requirements .................................................................................................................... 14 6.6 Pressure relief valve with parallel thread ......................................................................................... 15 6.7 Pressure relief valve for use with a changeover manifold ............................................................. 15 6.8 Pilot operated pressure relief valve .................................................................................................. 15 7 Testing of the design .......................................................................................................................... 16 7.1 General ................................................................................................................................................. 16 7.2 Test requirements ............................................................................................................................... 17 7.3 Dimensional checks ........................................................................................................................... 19 7.4 Hydraulic proof test ............................................................................................................................ 19 7.5 Overtorquing test ................................................................................................................................ 19 7.6 Start to discharge pressure test ........................................................................................................ 19 7.7 Discharge capacity test ...................................................................................................................... 20 7.8 Leak tightness tests ........................................................................................................................... 20 7.9 Ageing test .......................................................................................................................................... 20 7.10 Endurance test .................................................................................................................................... 21 7.11 Stress cracking test ............................................................................................................................ 21 7.11.1 General ................................................................................................................................................. 21 7.11.2 Mercurous nitrate immersion test ..................................................................................................... 21 7.11.3 Moist ammonia air stress cracking test ........................................................................................... 21 7.12 Vacuum test ......................................................................................................................................... 21 7.13 Visual inspection ................................................................................................................................ 21 7.14 Test records ........................................................................................................................................ 22 8 Marking ................................................................................................................................................ 22 8.1 Pressure relief valves ......................................................................................................................... 22 8.2 Thermal expansion valves ................................................................................................................. 22 8.3 Pilot operated pressure relief valve .................................................................................................. 23 9 Operating instructions ....................................................................................................................... 23 SIST EN 14129:2014

EN 14129:2014 (E) 3 10 Packaging ............................................................................................................................................. 24 Annex A (informative)

Terms used with LPG pressure relief valves ......................................................... 25 Annex B (normative)

Special low temperature requirements for valves ................................................... 26 Annex C (normative)

Ageing test ................................................................................................................... 27 C.1 General ................................................................................................................................................. 27 C.2 Ultraviolet light .................................................................................................................................... 27 C.3 Rain ....................................................................................................................................................... 27 Annex D (informative)

Environment checklist.............................................................................................. 30 Annex ZA (informative)

Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC ............................................................................................ 31 Bibliography ...................................................................................................................................................... 32

SIST EN 14129:2014

EN 14129:2014 (E) 4 Foreword This document (EN 14129:2014) 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 August 2014, and conflicting national standards shall be withdrawn at the latest by August 2014. 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. This document supersedes EN 14129:2004. This European Standard has been submitted for reference into: — the RID [9]; and — the technical annexes of the ADR [10]. NOTE These regulations take precedence over any clause of this European Standard. It is emphasised that RID/ADR/ADN are being revised regularly at intervals of two years which may lead to temporary non-compliances with the clauses of this European Standard. The major changes to this revision include the addition of: — pilot operated pressure relief valve; — an ageing test, see 7.9 and Annex C; — an endurance test, see 7.10; and — a stress cracking test, see 7.11. 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(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: 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 the United Kingdom. SIST EN 14129:2014

EN 14129:2014 (E) 5 Introduction This European Standard calls for the use of substances and procedures that may be injurious to health and/or the environment if adequate precautions are not taken. It refers only to technical suitability: it does not absolve the user from their legal obligations at any stage. Protection of the environment is a key political issue in Europe and elsewhere around the world. Protection of the environment in this document is understood in a very broad sense. The phrase is used, for example, in relation to the total life-cycle aspects of a product on the environment, including expenditure of energy, and during all phases of its existence, from mining of raw materials, to fabrication, packaging, distribution, use, scrapping, recycling of materials, etc. NOTE 1 Annex D comprises an environmental checklist which highlights the clauses of this European Standard that address environmental aspects. Provisions have to be restricted to a general guidance. Limit values are specified in national laws. It is recommended that manufacturers develop an environmental management policy. For guidance see the EN ISO 14000 series [6], [7] and [8]. It has been assumed in the drafting of this European Standard that the execution of its provisions is entrusted to appropriately qualified and experienced people. All pressures are gauge pressures unless otherwise stated. Valves designed in accordance with this standard are specifically for use in LPG applications. Valves manufactured in accordance EN ISO 4126-1 may also be used in certain LPG applications. NOTE 2 This European Standard requires measurement of material properties, dimensions and pressures. All such measurements are subject to a degree of uncertainty due to tolerances in measuring equipment, etc. It may be beneficial to refer to the leaflet “measurement uncertainty leaflet” SP INFO 2000 27 [13]. SIST EN 14129:2014

EN 14129:2014 (E) 6 1 Scope This European Standard specifies the requirements for the design and testing of spring loaded pressure relief valves and thermal expansion valves for use in: — static LPG pressure vessels, NOTE The pressure vessels can be situated above ground, underground or mounded. — LPG pressure vessels 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, changeover manifolds and vent pipes are specified in EN 14071. EN 14570 identifies the requirements for the pressure relief valve capacities for static pressure vessels. EN 12252 identifies the requirements for the pressure relief valve capacities for road tankers. Valves designed in accordance with this standard are specifically for use in LPG applications. Valves manufactured in accordance with EN ISO 4126-1 may also be used in certain LPG applications. Terms used with LPG pressure relief valves are described graphically in Annex A. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 549:1994, Rubber materials for seals and diaphragms for gas appliances and gas equipment EN 751-1, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 1: Anaerobic jointing compounds EN 751-2, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 2: Non-hardening jointing compounds EN 751-3, Sealing materials for metallic threaded joints in contact with 1st, 2nd and 3rd family gases and hot water - Part 3: Unsintered PTFE tapes EN 837-1, Pressure gauges - Part 1: Bourdon tube pressure gauges - Dimensions, metrology, requirements and testing EN 1092-1:2007+A1:2013, Flanges and their joints - Circular flanges for pipes, valves, fittings and accessories, PN designated - Part 1: Steel flanges EN 1503-1:2000, Valves - Materials for bodies, bonnets and covers - Part 1: Steels specified in European Standards SIST EN 14129:2014

EN 14129:2014 (E) 7 EN 1503-2:2000, Valves - Materials for bodies, bonnets and covers - Part 2: Steels other than those specified in European Standards EN 1503-3:2000, Valves - Materials for bodies, bonnets and covers - Part 3: Cast irons specified in European Standards EN 1503-4:2002, Valves - Materials for bodies, bonnets and covers - Part 4: Copper alloys specified in European Standards EN 1563:2011, Founding - Spheroidal graphite cast irons EN 10204, Metallic products - Types of inspection documents EN 10270-3:2011, Steel wire for mechanical springs - Part 3: Stainless spring steel wire EN 12165:2011, Copper and copper alloys - Wrought and unwrought forging stock EN 12420:1999, Copper and copper alloys - Forgings EN 13906-1:2013, Cylindrical helical springs made from round wire and bar - Calculation and design - Part 1 : Compression springs EN 14071:2004, Pressure relief valves for LPG tanks - Ancillary equipment ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation ISO 6957:1988, Copper alloys — Ammonia test for stress corrosion resistance ANSI/ASME B1.20.1–1983, Pipe Threads, General Purpose (Inch) 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 liquefied petroleum gas LPG low pressure liquefied gas composed of one or more light hydrocarbons which are assigned to UN 1011, UN 1075, UN 1965, UN 1969 or UN 1978 only and which consists mainly of propane, propene, butane, butane isomers, butene with traces of other hydrocarbon gases 3.2 pressure vessel assembly of the pressure-retaining envelope (including the openings and their closures) and non-pressure-retaining parts attached directly to it 3.3 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 3.4 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 SIST EN 14129:2014

EN 14129:2014 (E) 8 3.5 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 3.6 external pressure relief valve pressure relief valve which when fitted to the LPG pressure vessel has the spring external to the pressure envelope Note 1 to entry: See Figure 1. 3.7 pilot operated pressure relief valve external pressure relief valve where the pressure setting is separate from the discharge function Note 1 to entry: See Figure 2. 3.8 internal pressure relief valve pressure relief valve which when fitted to the LPG pressure vessel has the spring internal to the pressure envelope 3.9 semi-Internal pressure relief valve pressure relief valve which when fitted has the spring inside the pressure envelope and which has some of the working parts and the wrenching section outside the pressure envelope Note 1 to entry: See Figure 3. 3.10 fully internal pressure relief valve pressure relief valve which, when fitted, has the spring, all working parts and the wrenching section inside the pressure envelope Note 1 to entry: See Figure 4. 3.11 nominal set pressure predetermined pressure of the pressure relief valve at which the valve is set to start to discharge Note 1 to entry: RID [9] and ADR [10] require a capability of automatic opening under a pressure between 0,9 times and 1,0 times the test pressure of the pressure vessel to which they are fitted. 3.12 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 3.13 overpressure pressure increase between the nominal set pressure and the flow rating pressure, usually expressed as a percentage of nominal set pressure SIST EN 14129:2014

EN 14129:2014 (E) 9 3.14 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 3.15 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 3.16 flow rating pressure inlet pressure at which the discharge capacity is measured 3.17 maximum allowable pressure PS maximum pressure for which the valve is designed, as specified by the manufacturer 3.18 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 3.19 pop pressure pressure at which pop action occurs 3.20 blowdown difference between start to discharge and reseat pressures, usually expressed as a percentage of the nominal set pressure 3.21 discharge capacity capacity at the flow rating pressure of a pressure relief valve expressed in cubic metres per minute of free air at STP 3.22 sealing element non-metallic resilient component which effects a seal by contact with the pressure relief valve seat 3.23 valve seat normally raised area of the pressure relief valve body on to which the sealing element effects the seal 3.24 pressure relief valve isolating device device fitted between the storage pressure vessel and an external pressure relief valve (including pilot operated), which permits replacement of the pressure relief valve without depressurising the pressure vessel 3.25 changeover manifold device fitted to a storage vessel 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 vessel SIST EN 14129:2014

EN 14129:2014 (E) 10 3.26 leak tightness resistance to leakage to atmosphere across the valve seat or any other pressure containing component when the valve is closed 3.27 Standard Temperature and Pressure STP 15,6 °C (288,7 K), 1,013 bar absolute (0,1013 MPa absolute) 4 Operating conditions 4.1 The pressure relief valve shall be suitable for a minimum operating temperature of - 20 °C, the temperature to which the valve is expected to be exposed during normal use. Temperatures below this may be encountered during short periods, for example, during discharge. 4.2 In some parts of Europe, and for certain applications, lower minimum operating temperatures are encountered. When equipment is designed for a temperature lower than −20 °C, the pressure relief valve shall meet the requirements of Annex B. 4.3 The pressure relief valve shall be suitable for the maximum operating temperature of 65 °C. 4.4 The pressure relief valve shall be suitable for the minimum pressure a valve or fitting is normally exposed to, which is 1 bar absolute. Vacuum conditions on the valve, arising from butane at low temperature or evacuation of the pressure vessel can expose the valve or fitting to a vacuum of 50 mbar absolute. 4.5 Pressure relief valves manufactured in accordance with this European Standard are expected to have a useful safe service life expectancy of a minimum of 15 years from the date of manufacture/reconditioning, under normal operating conditions. This requirement does not apply to the protective cap or plug. 5 Materials 5.1 General 5.1.1 The manufacturer shall endeavour to acquire materials and components from suppliers who have a declared environmental policy; see EN ISO 14021, EN ISO 14024 and EN ISO 14025. 5.1.2 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. 5.1.3 Material for components shall be selected for adequate strength in service. The material shall resist brass dezincification, stress corrosion, impact or material failure. If stress corrosion could be present in a material, stress relieving heat treatment shall be carried out as necessary. 5.1.4 The components exposed to atmosphere shall be manufactured from corrosion resistant materials or suitably protected against corrosion. 5.2 Metallic materials 5.2.1 Valves shall be made from steel, stainless steel, copper alloys or other suitable materials. 5.2.2 For pressure containing components, steel and stainless steels shall comply with EN 1503-1:2000 or EN 1503-2:2000, cast iron shall comply with EN 1503-3:2000 and copper alloys shall comply with

EN 1503-4:2002. SIST EN 14129:2014

EN 14129:2014 (E) 11 5.2.3 Components made from stainless steel shall contain not less than 16 % chromium, and not less than 7 % nickel. 5.2.4 Springs shall be manufactured from stainless steel in accordance with EN 10270-3:2011 or material with an equivalent resistance to corrosion. 5.2.5 When carbon steel is used for a spring for an external relief valve, due to material strength requirements, it shall be adequately protected against corrosion. 5.2.6 Hot stamped brass shall be non-porous and suitable for machining or other processes. Leaded brass shall be CW614N or CW617N in accordance with EN 12420:1999 or EN 12165:2011. Sand-cast brass shall not be used. Cold drawn brass rods shall only be used for machining after adequate testing for internal cracking, porosity or other inclusions and shall be heat treated if required. Components produced from stamping brass shall not exhibit cold shuts or surface defects. Components manufactured from hot stamped brass or made of drawn brass or machined from brass rod shall be capable of withstanding, without cracking, the stress-cracking test. 5.2.7 Spheroidal graphite cast iron shall comply with EN 1563:2011, with an elongation at fracture of more than 18 %. Other ductile irons or cast irons shall not be used. Castings shall be free from inclusions and surface defects, which could adversely affect the strength, leak tightness or performance of the valve. 5.2.8 For guidance on the choice of metallic materials, see EN ISO 11114-1:2012. 5.3 Non-metallic components 5.3.1 All non-metallic materials in contact with LPG shall not distort, harden or adhere to the body or seat face to such an extent as to impair the function of the valve. 5.3.2 All rubber materials shall also comply with the requirements of EN 549:1994. The ozone test in EN 549:1994 shall only be carried out where gaskets/seals are exposed to the atmosphere. For guidance on the selection of non-metallic materials, see EN ISO 11114-2:2013 5.4 Lubricants, sealants, and adhesives Where used on threads and seals; lubricants, sealants, and adhesives shall be compatible with LPG and shall not interfere with the operation of the valve or fitting. Sealants shall comply with EN 751-1, EN 751-2 or EN 751-3. 5.5 Certification 5.5.1 The main metallic pressure-bearing parts shall be provided with material manufacturers’ certificates conforming to EN 10204; certificate 3.1. 5.5.2 Springs and other metallic parts shall have certificates conforming to EN 10204, certificate type 2.2 or certificate 3.1. 5.5.3 Non-metallic parts shall be provided with certificates confirming their conformance with the specification stated on the purchase order. 5.5.4 Certificates of material conformity with the requirements of the specification and the order shall be obtained by the manufacturer for all materials. For metallic materials certificates in accordance with EN 10204 for the complete consignment shall be obtained. SIST EN 14129:2014

EN 14129:2014 (E) 12 6 Design 6.1 General 6.1.1 All requirements described in this European Standard for “pressure relief valves” are also applicable to “thermal expansion valves” unless otherwise specified. 6.1.2 A pressure relief valve shall be: — an external pressure relief valve, see Figure 1; — pilot operated pressure relief valve, see Figure 2; — a semi-internal pressure relief valve, Figure 3; or — a fully internal pressure relief valve, see Figure 4. 6.1.3 The design of the pressure relief valve should consider the following: — minimising the use and waste of materials; and — minimising the environmental impact of in service maintenance and end of life disposal.

Figure 1 — External pressure relief valve
Figure 2 — Pilot operated pressure relief valve SIST EN 14129:2014
EN 14129:2014 (E) 13
Figure 3 — Semi-internal pressure relief valve
Figure 4 — Fully internal pressure relief valve 6.2 Design
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.