EN 14071:2015+A1:2019

SLOVENSKI STANDARD
01-september-2019
Nadomešča:
SIST EN 14071:2015
Oprema in pribor za utekočinjeni naftni plin (UNP) - Varnostni ventili za tlačne
posode za UNP - Pomožna oprema (vključno z dopolnilom A1)
LPG equipment and accessories - Pressure relief valves for LPG pressure vessels -
Ancillary equipment
Flüssiggas-Geräte und Ausrüstungsteile - Druckentlastungsventile für Druckbehälter für
Flüssiggas (LPG) - Zusatzausrüstung
Équipements pour GPL et leurs accessoires - Soupapes de sécurité des réservoirs de
gaz de pétrole liquéfié (GPL) - Équipement auxiliaire
Ta slovenski standard je istoveten z: EN 14071:2015+A1:2019
ICS:
23.020.32 Tlačne posode Pressure vessels
23.060.40 Tlačni regulatorji Pressure regulators
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 14071:2015+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2019
EUROPÄISCHE NORM
ICS 23.060.40
English Version
LPG equipment and accessories - Pressure relief valves for
LPG pressure vessels - Ancillary equipment
Équipements pour GPL et leurs accessoires - Soupapes Flüssiggas-Geräte und Ausrüstungsteile -
de sécurité des réservoirs de gaz de pétrole liquéfié Druckentlastungsventile für Druckbehälter für
(GPL) - Équipement auxiliaire Flüssiggas (LPG) - Zusatzausrüstung
This European Standard was approved by CEN on 5 March 2015 and includes Amendment 1 approved by CEN on 1 March 2019.

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, Serbia, 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: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14071:2015+A1:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Operating conditions . 9
5 Materials . 9
5.1 General . 9
5.2 Metallic materials . 10
5.3 Non-metallic components . 10
5.4 Lubricants, sealants, and adhesives . 10
5.5 Inspection Documents . 10
6 Design . 11
6.1 Introduction . 11
6.2 Pressure relief valve isolating devices . 11
6.2.1 General . 11
6.2.2 Actuation . 11
6.2.3 Indication of closure . 11
6.2.4 Guiding arrangements . 12
6.2.5 Isolating mechanism security . 12
6.2.6 Interchangeability . 12
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
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 Directive 2014/68/EU (Pressure equipment Directive) aimed to be
covered . 23
Bibliography . 25

European foreword
This document (EN 14071:2015+A1:2019) 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 2019 and conflicting national standards
shall be withdrawn at the latest by November 2019.
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 includes Amendment 1 approved by CEN on 2019-03-01.
This document supersedes !EN 14071:2015".
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
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.
!deleted text"
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.
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].
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
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
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:
— 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 gr
...