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 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.
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
oSIST prEN 16631:2023
01-julij-2023
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: prEN 16631
ICS:
23.020.32 Tlačne posode Pressure vessels
23.060.40 Tlačni regulatorji Pressure regulators
oSIST prEN 16631:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
oSIST prEN 16631:2023
oSIST prEN 16631:2023
DRAFT
EUROPEAN STANDARD
prEN 16631
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2023
ICS Will supersede 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 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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16631:2023 E
worldwide for CEN national Members.
oSIST prEN 16631:2023
prEN 16631:2023 (E)
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 . 8
9 Changing the set pressure . 9
10 Marking . 9
11 Documentation/Certification . 10
12 Operating instructions . 10
Annex A (informative) Assessment of PRVs by sampling . 11
A.1 General testing of PRVs on a sampling basis . 11
A.2 Sample size . 11
A.3 Sample selection . 11
A.4 Inspection period . 12
A.5 Pass criteria . 12
Bibliography . 13
oSIST prEN 16631:2023
prEN 16631:2023 (E)
European foreword
This document (prEN 16631:2023) has been prepared by Technical Committee CEN/TC 286 “Liquefied
petroleum gas equipment and accessories”, the secretariat of which is held by NSAI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 16631:2015.
oSIST prEN 16631:2023
prEN 16631:2023 (E)
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 14000 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.
oSIST prEN 16631:2023
prEN 16631:2023 (E)
1 Scope
This document 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 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 an informative annex detailing a sampling approach for PRV requalification which is only
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 14129:2014, 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
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
oSIST prEN 16631:2023
prEN 16631:2023 (E)
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 known 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
reconditioning
operation that includes complete dismantling of the valve, evaluation and replacement of components
and reassembly
3.6
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
3.7
sealing element
non-metallic moveable resilient component which affects 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.
oSIST prEN 16631:2023
prEN 16631:2023 (E)
5 Materials
5.1 General
Components for reconditioning shall meet the Original Equipment Manufacturer (OEM) specification.
5.2 Lubricants, sealants and adhesives
Lubricants, sealants and adhesives shall be compatible with LPG and not interfere with the operation of
the PRV, when used on operating threads and seals. Sealants shall comply with the requirements of
EN 751-1, EN 751-2 or EN 751-3.
5.3 Shelf life
5.3.1 Shelf life of unassembled components
Unassembled metallic components, when stored appropriately have an unlimited shelf life.
Unassembled rubber components shall have a storage life of 7 years with the ability to extend this to 10
years when the requirements of ISO 2230 are met.
Lubricants, sealants and adhesives shall have a shelf life in accordance with the manufacturer's
instructions.
5.3.2 Storage life of assembled PRVs
After manufacture or reconditioning, PRVs may be stored for up to two years when stored in line with
the manufacturer's recommendations. Manufacturers shall ensure that the operating conditions of the
PRV shall remain
...
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