FprEN 14129

SLOVENSKI STANDARD
01-marec-2021
Oprema in pribor za utekočinjeni naftni plin (UNP) - Varnostni ventili za tlačne
posode za UNP
LPG Equipment and accessories - Pressure relief valves for LPG pressure vessels
Flüssiggas-Geräte und Ausrüstungsteile - Druckentlastungsventile für Behälter für
Flüssiggas (LPG)
Équipements pour GPL et leurs accessoires - Soupapes de sûreté pour réservoirs de
GPL
Ta slovenski standard je istoveten z: prEN 14129
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.

DRAFT
EUROPEAN STANDARD
prEN 14129
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2021
ICS Will supersede EN 14129:2014
English Version
LPG Equipment and accessories - Pressure relief valves for
LPG pressure vessels
Équipements pour GPL et leurs accessoires - Soupapes Flüssiggas-Geräte und Ausrüstungsteile -
de sûreté pour réservoirs de GPL Druckentlastungsventile für Behälter für Flüssiggas
(LPG)
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 286.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14129:2021 E
worldwide for CEN national Members.

prEN 14129:2021 (E)
Contents
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Operating conditions . 10
5 Materials . 11
5.1 General . 11
5.2 Metallic materials . 11
5.3 Non-metallic materials . 12
5.4 Lubricants, sealants, and adhesives . 12
5.5 Certification . 12
6 Design . 13
6.1 General . 13
6.2 Design parameters . 14
6.3 Threads . 15
6.4 Springs . 15
6.5 Additional requirements . 15
6.6 Pressure relief valve with parallel thread . 16
6.7 Pressure relief valve for use with a changeover manifold . 16
6.8 Pilot operated pressure relief valve . 16
7 Testing of the design . 17
7.1 General . 17
7.2 Test requirements . 19
7.3 Dimensional checks . 20
7.4 Hydraulic proof test . 20
7.5 Overtorquing test . 20
7.6 Start to discharge pressure test . 21
7.7 Discharge capacity test . 21
7.8 Leak tightness tests . 21
7.9 Ageing test . 22
7.10 Endurance test . 22
7.11 Stress cracking test . 22
7.11.1 General . 22
7.11.2 Mercurous nitrate immersion test . 22
7.11.3 Moist ammonia air stress cracking test . 22
7.12 Vacuum test . 23
7.13 Visual inspection . 23
7.14 Test records . 23
8 Marking . 23
8.1 Pressure relief valves . 23
8.2 Thermal expansion valves . 24
8.3 Pilot operated pressure relief valve . 24
9 Operating instructions . 25
10 Packaging . 25
prEN 14129:2021 (E)
Annex A (informative) Terms used with LPG pressure relief valves . 26
Annex B (normative) Special low temperature requirements for valves . 27
Annex C (normative) Ageing test . 28
C.1 General . 28
C.2 Ultraviolet light . 28
C.3 Rain . 28
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/68/EU aimed to be covered . 31
Bibliography . 33

prEN 14129:2021 (E)
European foreword
This document (prEN 14129:2021) has been prepared by Technical Committee CEN/TC 286 “LPG
equipmwnt and accessories”, the secretariat of which is held by NSAI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14129:2014.
This document has been prepared under a standardization request 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.
This document has been submitted for reference in
— the RID [8] and/or
— the technical annexes of the ADR [9].
NOTE These regulations take precedence over any clause of this standard. It is emphasized that RID/ADR are
being revised regularly at intervals of two years which may lead to temporary non-compliances with the clauses of
this standard.
The main changes with respect to the previous edition include:
— Addition of normative references;
— Revision of 5.1, 5.2, 5.3, 6.4, 7.1, 7.11.3; and
— Revision of Annex ZA.
prEN 14129:2021 (E)
Introduction
This document 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. For CEN/TC 286 this is
covered in CEN/TS 16765 [1] and this Technical Specification should be read in conjunction with this
document. The Technical Specification provides guidance on the environmental aspects to be considered
regarding equipment and accessories produced for the LPG industry and the following is addressed:
a) design;
b) manufacture;
c) packaging;
d) use and operation; and
e) disposal.
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 [7], [8] and [9].
It has been assumed in the drafting of this document 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 [4] may also be used in certain LPG applications.
NOTE This document 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 [12].
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