SIST EN 16631:2025
(Main)LPG equipment and accessories - Pressure relief valves for LPG pressure vessels - Reconditioning requirements
LPG equipment and accessories - Pressure relief valves for LPG pressure vessels - Reconditioning requirements
This European Standard specifies the requirements for the reconditioning, retesting and certification of Pressure Relief Valves (PRVs) for LPG pressure vessels covered under the scope of EN 14129.
This European Standard applies to retesting and reconditioning of PRVs that are carried out in a workshop and does not apply to site adjustment of installed PRVs.
Annex A is an informative Annex detailing a sampling approach for PRV requalification which should only be used in case of on-site requalification of series produced pressure vessels fitted with series produced PRVs.
Flüssiggas-Geräte und Ausrüstungsteile - Sicherheitsventile für Druckbehälter für Flüssiggas (LPG) - Anforderungen an die Instandsetzung
Dieses Dokument legt die Anforderungen an die Instandsetzung und Wiederholungsprüfung von Sicherheitsventilen für Druckbehälter (PRV) für Flüssiggas (LPG) fest, die in den Anwendungsbereich von EN 14129 fallen.
Dieses Dokument gilt für Wiederholungsprüfungen und Instandsetzungen von PRV, welche in einer Werkstatt erfolgen, nicht jedoch für die Einstellung eingebauter PRV am Anwendungsort.
Anhang A ist ein normativer Anhang, der ein Stichprobenverfahren zur wiederkehrenden Prüfung von PRV enthält, das für wiederkehrende Prüfungen von seriengefertigten Druckbehältern mit seriengefertigten PRV am Anwendungsort angewendet werden könnte.
Équipements pour GPL et leurs accessoires - Soupapes de sécurité pour réservoirs de GPL sous pression - Exigences de reconditionnement
No Scope available
Oprema in pribor za utekočinjeni naftni plin (UNP) - Varnostni ventili za tlačne posode za UNP - Zahteve za obnovo
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2025
Nadomešča:
SIST EN 16631:2015
Oprema in pribor za utekočinjeni naftni plin (UNP) - Varnostni ventili za tlačne
posode za UNP - Zahteve za obnovo
LPG equipment and accessories - Pressure relief valves for LPG pressure vessels -
Reconditioning requirements
Flüssiggas-Geräte und Ausrüstungsteile - Sicherheitsventile für Druckbehälter für
Flüssiggas (LPG) - Anforderungen an die Instandsetzung
Équipements pour GPL et leurs accessoires - Soupapes de sécurité pour réservoirs de
GPL sous pression - Exigences de reconditionnement
Ta slovenski standard je istoveten z: EN 16631:2025
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 16631
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2025
EUROPÄISCHE NORM
ICS 23.060.40 Supersedes EN 16631:2015
English Version
LPG equipment and accessories - Pressure relief valves for
LPG pressure vessels - Reconditioning requirements
Équipements pour GPL et leurs accessoires - Soupapes Flüssiggas-Geräte und Ausrüstungsteile -
de sécurité pour réservoirs de GPL sous pression - Sicherheitsventile für Druckbehälter für Flüssiggas
Exigences de reconditionnement (LPG) - Anforderungen an die Instandsetzung
This European Standard was approved by CEN on 7 July 2024.
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, 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, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16631:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General . 6
5 Materials . 7
5.1 General . 7
5.2 Lubricants, sealants and adhesives . 7
5.3 Shelf life . 7
5.3.1 Shelf life of unassembled components . 7
5.3.2 Storage life of assembled PRVs . 7
6 Inspection . 7
7 Reconditioning . 8
8 Pressure setting . 8
8.1 General . 8
8.2 Setting and testing of PRVs . 9
9 Changing the set pressure . 9
10 Marking . 10
11 Reconditioning records . 10
12 Operating instructions . 10
Annex A (normative) Assessment of PRVs by sampling . 11
Bibliography . 13
European foreword
This document (EN 16631:2025) 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 July 2025, and conflicting national standards shall be
withdrawn at the latest by July 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 16631:2015.
— Introduction of terms and definitions
— Revision of Clause 4;
— Revision of Clause 5;
— Revision of Clause 8;
— Revision of Clause 10;
— Revision of Clause 11 Documents/certification (now titled Reconditioning records);
— Revision of Clause 12;
— Revision of Annex A for clarity.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Türkiye and the United
Kingdom.
Introduction
Protection of the environment is a key political issue in Europe and elsewhere. Protection of the
environment is taken in a very broad sense. What is meant is the total life cycle aspects of, e.g. a product
on the environment, including expenditure of energy and during all phases from mining of raw materials,
fabrication, packaging, distribution, use, scrapping, recycling of materials, etc.
Provisions have to be restricted to a general guidance. Limit values are specified in national laws. It is
recommended that companies using this document develop an environmental management policy. For
guidance see ISO 14001 series.
It has been assumed in the drafting of this document that the execution of its provisions is entrusted to
appropriately qualified and experienced people. Where judgements are called for, it has been assumed
that they are made by competent persons who have been trained specifically for the tasks.
1 Scope
This document specifies the requirements for the reconditioning and retesting of pressure relief valves
(PRVs) for LPG pressure vessels covered under the scope of EN 14129.
This document applies to retesting and reconditioning of PRVs that are carried out in a workshop and
does not apply to site adjustment of installed PRVs.
Annex A is a normative annex detailing a sampling approach for PRV requalification which could be used
in case of on-site requalification of series produced pressure vessels fitted with series produced PRVs.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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 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 and PTFE strings
EN 837-1, Pressure gauges — Part 1: Bourdon tube pressure gauges — Dimensions, metrology,
requirements and testing
EN 14129:2024, LPG Equipment and accessories — Pressure relief valves for LPG pressure vessels
ISO 2230, Rubber products — Guidelines for storage
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org
3.1
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 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 also referred to as a “safety valve” in ADR.
3.3
competent person
person which by combination of appropriate qualification, training, experience, and resources, is able to
make objective judgments on the subject
3.4
setting
operation of adjusting and testing the start to discharge pressure to the nominal set pressure
3.5
production batch
group of pressure parts or finished pressure vessels, made consecutively by the same manufacturer using
the same manufacturing techniques to the same design, nominal size and material specifications on the
same production machinery and subject to the same heat treatment conditions
3.6
reconditioning
operation that includes complete dismantling of the valve, evaluation and replacement of
components, assembly and setting
3.7
requalification
test carried out at defined intervals, as part of a scheme, to confirm that a PRV is fit for a further
period of service
3.8
pop action
rapid opening of the pressure relief valve sealing element so that the pressure relief valve is fully open,
resulting from an increase of inlet pressure creating a sudden increase in force and compression of the
spring
3.9
sealing element
non-metallic resilient component which effects a seal by contact with the pressure relief valve seat
4 General
PRVs shall have a storage life of two years after being assembled and set.
All PRVs shall be subjected to inspection in accordance with Clause 6 prior to reconditioning, setting or
changing the set pressure.
PRVs where the set pressure (reset) is to be changed, shall meet the requirements of Clause 9.
PRVs that have been stored for more than two years, but are less than five years old, shall have the sealing
element changed and shall meet the requirements of Clauses 6 and 8.
PRVs that have been stored for more than five years shall be reconditioned in accordance with Clauses 6,
7 and 8.
PRVs that are to be reconditioned shall be subjected to reconditioning in accordance with Clauses 6, 7
and 8.
Where on-site requalification of a homogenous batch of pressure vessels is assessed by sampling, PRVs
shall follow the protocol in Annex A to ensure their suitability for a continued period until its next
requalification.
Annex A details a sampling approach for PRV requalification which should only be used in case of on-site
req
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