SIST EN 14071:2015

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Flüssiggas-Geräte und Ausrüstungsteile - Druckentlastungsventile für Behälter für Flüssiggas (LPG) - ZusatzausrüstungÉquipements pour GPL et leurs accessoires - Soupapes de sûreté des réservoirs de gaz de pétrole liquéfié (GPL) - Équipement auxiliaireLPG equipment and accessories - Pressure relief valves for LPG pressure vessels - Ancillary equipment23.060.40Pressure regulators23.020.30MHNOHQNHPressure vessels, gas cylindersICS:Ta slovenski standard je istoveten z:EN 14071:2015SIST EN 14071:2015en,fr,de01-julij-2015SIST EN 14071:2015SLOVENSKI
STANDARDSIST EN 14071:20051DGRPHãþD



SIST EN 14071:2015



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14071
May 2015 ICS 23.060.40 Supersedes EN 14071:2004English Version
LPG equipment and accessories - Pressure relief valves for LPG pressure vessels - Ancillary equipment
Équipements pour GPL et leurs accessoires - Soupapes de sécurité des réservoirs de gaz de pétrole liquéfié (GPL) - Équipement auxiliaire
Flüssiggas-Geräte und Ausrüstungsteile - Druckentlastungsventile für Behälter für Flüssiggas (LPG) -Zusatzausrüstung This European Standard was approved by CEN on 5 March 2015.
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 © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14071:2015 ESIST EN 14071:2015



EN 14071:2015 (E) 2 Contents Page Foreword .4 Introduction .5 1 Scope .6 2 Normative references .6 3 Terms and definitions .7 4 Operating conditions .8 5 Materials .9 5.1 General .9 5.2 Metallic materials .9 5.3 Non-metallic components . 10 5.4 Lubricants, sealants, and adhesives . 10 5.5 Inspection Documents . 10 6 Design . 10 6.1 Introduction . 10 6.2 Pressure relief valve isolating devices . 10 6.2.1 General . 10 6.2.2 Actuation . 11 6.2.3 Indication of closure . 11 6.2.4 Guiding arrangements . 11 6.2.5 Isolating mechanism security . 11 6.2.6 Interchangeability . 11 6.3 PRV manifold . 12 6.3.1 General . 12 6.3.2 Indication of port closure . 15 6.3.3 Port closure . 15 6.4 Vent pipe . 15 6.4.1 Design . 15 6.4.2 Materials . 15 6.4.3 Effect from external conditions . 15 6.5 Connections . 15 6.6 Threads . 15 6.7 Minimum requirements for springs . 16 7 Testing of the design . 16 7.1 General . 16 7.2 Test requirements . 16 7.3 Hydraulic proof test . 17 7.4 Relief valve isolator test . 17 7.5 Testing of audible signal of isolating devices and residual flow of isolating devices and PRV manifolds . 17 7.6 Resistance of the isolating mechanism . 17 7.7 Over-torque deformation test . 18 7.8 Operation test . 18 7.8.1 General . 18 7.8.2 System test . 18 7.9 Stress cracking test . 18 7.9.1 General . 18 7.9.2 Mercury(I)nitrate immersion test . 18 SIST EN 14071:2015



EN 14071:2015 (E) 3 7.9.3 Moist ammonia air stress cracking test . 19 8 Production testing of isolating devices and PRV manifolds . 19 9 Marking and labelling . 19 9.1 PRV isolating device . 19 9.2 Pressure relief valve PRV manifolds . 19 10 User instructions . 20 10.1 PRV isolating devices . 20 10.2 PRV manifolds . 20 Annex A (normative)
Dimensions of master test pieces for PRV and isolating devices . 21 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC for pressure equipment . 23 Bibliography . 25
SIST EN 14071:2015



EN 14071:2015 (E) 4 Foreword This document (EN 14071:2015) 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 November 2015, and conflicting national standards shall be withdrawn at the latest by November 2015. 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 14071:2004. 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. The major changes in this revision include: — the removal of requirements for protection caps; — the introduction of additional testing; — an update of the terminology. 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 14071:2015



EN 14071:2015 (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. It is recommended that manufacturers develop an environmental management policy. For guidance, see the EN ISO 14000 series [1], [2] and [3]. 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. NOTE 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 [5]. SIST EN 14071:2015



EN 14071:2015 (E) 6 1 Scope This European Standard specifies the design, testing and inspection requirements for pressure relief valve isolating devices, valve manifolds, vent pipes and system assemblies which are, where necessary, used with pressure relief valves for use in static pressure vessels for Liquefied Petroleum Gas (LPG) service. This European Standard addresses both prototype testing and production testing of isolating devices and PRV manifolds. Pressure relief valves for LPG pressure vessels are specified in EN 14129:2014. 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 1092-1, 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 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 10204:2004, Metallic products
Types of inspection documents EN 10270-3:2011, Steel wire for mechanical springs
Part 3: Stainless spring steel wire EN 12164:2011, Copper and copper alloys
Rod for free machining purposes EN 12165:2011, Copper and copper alloys
Wrought and unwrought forging stock EN 12420, Copper and copper alloys
Forgings EN 13480-3:2012, Metallic industrial piping
Part 3: Design and calculation SIST EN 14071:2015



EN 14071:2015 (E) 7 EN 13906-1, Cylindrical helical springs made from round wire and bar
Calculation and design
Part 1 : Compression springs EN 14129:2014, LPG Equipment and accessories
Pressure relief valves for LPG pressure vessels ISO 6957, Copper alloys — Ammonia test for stress corrosion resistance ASME B1.20.1:2013, 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 envelope (including the openings and their closures) and non-pressure-retaining parts attached directly to it 3.3 pressure relief valve (PRV) 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 Note 1 to entry: This is known as a “safety valve” in ADR. 3.4 pressure relief valve system PRV system pressure relief valve(s) for use on the pressure vessel complete with isolating device or PRV manifold, and vent pipe where appropriate 3.5 pressure relief valve isolating device device fitted between the storage tank and the external pressure relief valve, which permits the replacement of the pressure relief valve without de-pressuring the pressure vessel 3.6 coefficient of discharge Kd ratio of the actual measured flow capacity divided by the calculated theoretical capacity for the same fluid at the same operating conditions 3.7 pressure relief valve manifold PRV 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 depressurizing the vessel SIST EN 14071:2015



EN 14071:2015 (E) 8 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 vent pipe open-ended pipe, fitted with a protection cap and attached to the pressure relief valve outlet, to direct discharged fluid away from the protected pressure vessel surface 3.10 design signal flow limited flow of LPG intended to equalise pressures so that a replacement PRV can be properly fitted to an isolating device; indicate the effectiveness of the internal shut off in an isolating device before the PRV is completely removed; and produce an acoustic signal 3.11 Standard Temperature and Pressure STP 15,6 °C (288,7 K), 1,013 bar absolute (0,1013 MPa absolute) 3.12 flow rating pressure inlet pressure at which the discharge capacity is measured 3.13 lift actual travel of the sealing disc away from the closed position 3.14 sealing element non-metallic resilient component which effects a seal by contact with the valve seat 3.15 valve seat normally raised area of the pressure relief valve body on to which the sealing element effects a seal 3.16 maximum allowable pressure PS maximum pressure for which the equipment is designed Note 1 to entry: All pressures are gauge pressures unless otherwise stated. 3.17 nominal diameter (DN) numerical designation of the size of a component, which is a convenient round number, approximately equal to the manufacturing dimensions in millimetres (mm) 3.18 external leak tightness resistance to leakage through the fitting to or from the atmosphere 4 Operating conditions 4.1 Equipment designed in accordance with this European Standard shall be suitable for: SIST EN 14071:2015



EN 14071:2015 (E) 9 — minimum operating temperature of −20°C; — maximum operating temperature of 65°C; — maximum allowable pressure of 25 bar; and — minimum pressure of 50 mbar absolute. 4.2 For some parts of Europe and certain applications, temperatures lower than - 20°C can be encountered. For these conditions, a temperature rating of - 40°C shall apply. NOTE 1 In service, temperatures below this can be encountered during short periods, for example, during discharge. NOTE 2 Vacuum conditions on the isolating device or PRV manifold, 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. 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 device is intended to be used. 5.1.2 Material for components shall be selected for adequate strength in service. The material shall resist atmospheric corrosion, brass dezincification, stress corrosion, impact and material failure. Where stress corrosion could be present in a material, stress relieving heat treatment shall be carried out where necessary. 5.1.3 The components exposed to atmosphere shall be manufactured from corrosion resistant materials or suitably protected against corrosion. NOTE Alternative materials to those listed in 5.2 are not precluded, providing they comply with a standard or specification that ensures control of chemical and physical properties, and quality appropriate to the end use. 5.2 Metallic materials 5.2.1 Equipment 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. 5.2.3 Components made from stainless steel shall contain not less than 16 % chromium, and not less than 7 % nickel. Springs shall be manufactured from stainless steel in accordance with EN 10270-3:2011, or from a material with an equivalent resistance to corrosion. 5.2.4 Hot stamped brass shall be non-porous and shall be suitable for machining or other processes. Leaded brass shall be CW614N or CW617N in accordance with EN 12420, EN 12164:2011 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, also known as folds, or surface defects. Components manufactured from hot stamped brass, drawn brass or machined from brass rod, shall be capable of withstanding, without cracking, the stress-cracking test. 5.2.5 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 device. SIST EN 14071:2015



EN 14071:2015 (E) 10 NOTE
For guidance on the choice of metallic materials, see EN ISO 11114-1 [7]. 5.3 Non-metallic components 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 device. 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. NOTE For guidance on the choice of non-metallic materials, see EN ISO 11114-2 [8]. 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 Inspection Documents The main metallic pressure-bearing parts shall be provided with material manufacturers’ certificates conforming to EN 10204:2004, certificate type 3.1. Springs and other metallic parts shall have certificates conforming to EN 10204:2004 certificate type 2.2. Non-metallic parts shall be provided with certificates confirming their conformance with the specification. 6 Design 6.1 Introduction 6.1.1 This section identifies essential requirements for the design of ancillary equipment. 6.1.2 The design shall allow the equipment to operate with the flow characteristics as identified in 7.8. 6.1.3 Equipment components shall be designed with adequate strength and clearances to ensure correct operation in service. 6.1.4 The design should take account of the following: — minimizing the use of raw materials; — minimizing the environmental impact of in-service maintenance and end of life disposal; and — efficient packaging of the finished product. 6.2 Pressure relief valve isolating devices 6.2.1 General Pressure relief valves intended for use with these isolating devices shall be in accordance with EN 14129:2014. If interchangeability of pressure relief valves of diverse manufacturers is required, the requirements of 6.2.6 shall be fulfilled. SIST EN 14071:2015



EN 14071:2015 (E) 11 6.2.2 Actuation Isolating devices shall only be actuated by the fitting or removal of the pressure relief valve. The isolating mechanism shall be closed by a spring. The seal should preferably be metal to metal. 6.2.3 Indication of closure Isolating devices shall have positive means to determine that closure has occurred when the PRV has been removed. This shall be achieved by: — the use of two tell-tale holes in the pressure relief valve. When one complete hole is visible above the bonded seal, the isolating device shall close within one further revolution. (The valve should be closed within five revolutions when removing a fully engaged relief valve from an isolating device). When the isolating device is closed there shall be three full revolutions remaining before disengagement. The use of visible marking (e.g. machined groove) may be used on a thermal expansion valve which shall be visible when three full turns of engagement remain; — a noticeable audible change in the release of gas which shall have taken place when removing the pressure relief valve indicating closure of the isolating device while a minimum of three threads remain engaged. When the isolating device is closed the residual flow shall not exceed 600 l/h at 1 bar differential and STP. The residual flow through a port of a PRV manifold, with a PRV removed, shall not exceed 2,5 l/h at 1 bar differential and STP. 6.2.4 Guiding arrangements The design shall incorporate guiding arrangements of the isolating mechanism necessary to ensure reliable operation. 6.2.5 Isolating mechanism security The isolating mechanism shall be fastened securely to prevent it becoming loose while in service. 6.2.6 Interchangeability 6.2.6.1 Interchangeability of PRVs, of diverse manufacturers, in isolating devices is permitted when the following requirements are met: — isolating devices shall be designed and manufactured to ensure that their intended operation is not interfered with by the pressure relief valve; — isolating devices shall be manufactured to the essential dimensions with Figure 1; and — the flow capacity of the isolating device shall be tested in accordance with the requirement of 7.4 using the master pressure relief valve test piece defined in Annex A. The Kd shall be greater than 0,91 for the M36 isolating device and greater than 0,90 for the M45 isolating device. 6.2.6.2 Interchangeability of other designs of pressure relief valves and isolating devices not conforming to the dimensions given in Figure 1, may take place if it is shown that the flow capacity and other characteristics, tested in accordance with 7.4, of all possible combinations remain acceptable. PRV connections, not conforming to the dimensions given in Figure 1, shall be designed to prevent connection with the isolating devices conforming to Figure 1. SIST EN 14071:2015



EN 14071:2015 (E) 12 6.3 PRV manifold 6.3.1 General A PRV manifold is normally designed with two or four outlet ports and accommodates either two, three or four pressure relief valves. The PRV manifold incorporates a pressure relief valve that is not included in the vessel discharge capacity. This allows the removal or replacement of one pressure relief valve without compromising the overall discharge capacity. The PRV manifold shall be designed to enable the discharge capacity of the required pressure relief valves fitted, to be achieved with the absence of chatter, flutter, sticking and harmful vibration. Where the product of PS x DN is 3,000 bar or greater the PRV manifold shall be designed for strength in accordance with EN 13480-3:2012, or other suitable standards. SIST EN 14071:2015



EN 14071:2015 (E) 13
NOTE The dimensional information is in Table 1. Figure 1 — Essential dimensions for the isolating device and relief valve connection SIST EN 14071:2015



EN 14071:2015 (E) 14 Table 1 — Key for Figure 1 Dimensions in millimetres unless otherwise stated
M 36 M 45 Pressure relief valve A1 28 max 37 max A2 M36 × 2 M45 × 2 A3 51 min 60 min A4 11,8 to 12,2 A5 20,5 to 20,8 A6 a Ø 1,4 to
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