oSIST prEN 16668:2022
(Main)Industrial valves - Requirements and testing for metallic valves as pressure accessories
Industrial valves - Requirements and testing for metallic valves as pressure accessories
This document applies to metallic valves as pressure accessories for industrial applications with a maximum allowable pressure PS greater than 0,5 bar in accordance with the European legislation for pressure equipment and specifies minimum requirements applicable to design, manufacture, testing, materials and documentation.
All relevant essential safety requirements of the European legislation for pressure equipment applicable to valves have been taken into consideration and are addressed in this document.
This document is not applicable to:
- safety valve and bursting disc (a safety accessory),
- sight glass with its frames (component of a pressure equipment) and
- measurement chambers.
For other exclusions, refer to the European legislation for pressure equipment [31].
Industriearmaturen - Anforderungen und Prüfungen für Metallarmaturen als drucktragende Ausrüstungsteile
Dieses Dokument gilt für Metallarmaturen als drucktragende Ausrüstungsteile für Anwendungen in der Industrie mit einem maximal zulässigen Druck (PS) größer als 0,5 bar nach der Europäischen Richtlinie über Druckgeräte und legt die Mindestanforderungen fest, die für die Gestaltung (Auslegung), Herstellung, Prüfung, Werkstoffe und Dokumentation gelten.
Sämtliche relevanten grundlegenden Sicherheitsanforderungen der Europäischen Richtlinie über Druckgeräte, die für die Armaturen gelten, wurden berücksichtigt und werden in dieser Norm behandelt.
Dieses Dokument ist nicht anwendbar auf:
- Sicherheitsventile und Berstscheiben (ein Ausrüstungsteil mit Sicherheitsfunktion);
- Schaugläser und deren Fassungen (Bauteil eines Druckgerätes) und
- Messkammern.
Hinsichtlich weiterer Ausschlüsse wird auf die Europäische Richtlinie über Druckgeräte [31] verwiesen.
Robinetterie industrielle - Exigences et essais pour appareils de robinetterie métalliques utilisés comme accessoires sous pression
Le présent document est applicable aux appareils de robinetterie métalliques utilisés comme accessoires sous pression pour applications industrielles avec une pression maximale admissible PS supérieure à 0,5 bar, conformément à la règlementation européenne pour les équipements sous pression", et spécifie les exigences minimales applicables en matière de conception, de fabrication, d'essais, de matériaux et de documentation.
Toutes les exigences essentielles de sécurité pertinentes de la règlementation européenne pour les équipements sous pression" applicables aux appareils de robinetterie ont été prises en considération et sont traitées dans le présent document.
Le présent document ne s'applique pas :
- aux soupapes de sûreté et disques de rupture (accessoires de sécurité),
- aux voyants et à leurs cadres (composants d'un équipement sous pression), et
- aux chambres de mesure.
Pour les autres exclusions, se reporter à la règlementation européenne pour les équipements sous pression [31].
Industrijski ventili - Zahteve in preskušanje kovinskih ventilov kot tlačnega pribora
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 16668:2022
01-marec-2022
Industrijski ventili - Zahteve in preskušanje kovinskih ventilov kot tlačnega pribora
Industrial valves - Requirements and testing for metallic valves as pressure accessories
Industriearmaturen - Anforderungen und Prüfungen für Metallarmaturen als
drucktragende Ausrüstungsteile
Robinetterie industrielle - Exigences et essais pour appareils de robinetterie métalliques
utilisés comme accessoires sous pression
Ta slovenski standard je istoveten z: prEN 16668
ICS:
23.060.01 Ventili na splošno Valves in general
oSIST prEN 16668:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 16668:2022
DRAFT
EUROPEAN STANDARD
prEN 16668
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2022
ICS 23.060.01 Will supersede EN 16668:2016+A1:2018
English Version
Industrial valves - Requirements and testing for metallic
valves as pressure accessories
Robinetterie industrielle - Exigences et essais pour Industriearmaturen - Anforderungen und Prüfungen
appareils de robinetterie métalliques utilisés comme für Metallarmaturen als drucktragende
accessoires sous pression Ausrüstungsteile
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 69.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 16668:2022 E
worldwide for CEN national Members.
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Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Category of valves . 9
5 Requirements . 9
5.1 Design . 9
5.1.1 General . 9
5.1.2 Shell design strength . 9
5.1.3 Protection against exceeding the allowable limits . 10
5.2 Materials . 10
5.2.1 General requirements . 10
5.2.2 European harmonized standards . 10
5.2.3 European approval of materials (EAM) . 10
5.2.4 Particular Material Appraisal (PMA) . 10
5.2.5 Requirements for prevention of brittle fracture at low temperatures . 11
5.2.6 Selection of bolting material . 11
5.2.7 Material selection for parts other than shell . 11
5.3 Manufacturing . 11
5.3.1 Welding . 11
5.3.2 Heat treatment . 14
5.3.3 Traceability . 14
5.3.4 Qualification of non-destructive testing personnel . 14
5.4 Non-destructive testing (NDT) . 14
5.4.1 Non-destructive testing of steel castings . 14
5.4.2 Non-destructive testing of joint welding . 14
5.5 Final assessment . 14
5.6 Marking . 15
5.7 Surface and coating testing . 15
5.8 Documentation . 15
5.8.1 Documentation for final inspection. 15
5.8.2 Accompanying documents . 16
Annex A (normative) Classification of valves . 17
Annex B (informative) European harmonized standards for materials and components for
shell parts . 22
Annex C (informative) European Approval of Materials (EAM) . 24
Annex D (informative) European harmonized supporting standards for valves . 25
Annex E (informative) Non-destructive testing of steel castings . 27
E.1 Terms and Definitions . 27
E.2 Non-destructive testing of steel castings . 27
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E.2.1 General . 27
E.2.2 Testing procedures . 30
Annex F (normative) Non-destructive testing (NDT) of joint welding . 35
F.1 General . 35
F.2 Non-destructive testing (NDT) extent . 35
F.3 Selection of NDT-methods . 41
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU (Pressure Equipment Directive) aimed to be
covered . 43
Bibliography . 43
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European foreword
This document (prEN 16668:2022) has been prepared by Technical Committee CEN/TC 69 “Industrial
valves”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 16668:2016+A1:2018.
In comparison with the previous edition, the following technical modifications have been made:
— the following clauses and subclauses were modified: 5.3.1.1, 5.3.1.2, 5.3.1.3, 5.3.1.4, 5.3.1.5, 5.3.1.6,
5.3.1.7, 5.3.2, 5.3.4;
— Annex ZA was modified.
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) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
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Introduction
This document is to be understood as an umbrella standard referencing European harmonized standards
for industrial metallic valves as pressure accessories for industrial applications. It covers the relevant
minimum requirements to meet the Essential Safety Requirements of the Pressure Equipment Directive.
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1 Scope
This document applies to metallic valves as pressure accessories for industrial applications with a
maximum allowable pressure PS greater than 0,5 bar in accordance with the European legislation for
pressure equipment and specifies minimum requirements applicable to design, manufacture, testing,
materials and documentation.
All relevant essential safety requirements of the European legislation for pressure equipment applicable
to valves have been taken into consideration and are addressed in this document.
This document is not applicable to:
— safety valve and bursting disc (a safety accessory),
— sight glass with its frames (component of a pressure equipment) and
— measurement chambers.
For other exclusions, refer to the European legislation for pressure equipment [31].
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.
1
EN 19:— , Industrial valves - Marking of metallic valves
EN 736-1:2018, Valves - Terminology - Part 1: Definition of types of valves
EN 764-1:2015+A1:2016, Pressure equipment - Part 1: Vocabulary
EN 764-2:2012, Pressure equipment - Part 2: Quantities, symbols and units
EN 764-4:2014, Pressure equipment - Part 4: Establishment of technical delivery conditions for metallic
materials
EN 764-5:2014, Pressure equipment - Part 5: Inspection documentation of metallic materials and
compliance with the material specification
EN 764-7:2002, Pressure equipment - Part 7: Safety systems for unfired pressure equipment
EN 1349:2009, Industrial process control valves
EN 10269:2013, Steels and nickel alloys for fasteners with specified elevated and/or low temperature
properties
EN 12266-1:2012, Industrial valves - Testing of metallic valves - Part 1: Pressure tests, test procedures and
acceptance criteria - Mandatory requirements
EN 12266-2:2012, Industrial valves - Testing of metallic valves - Part 2: Tests, test procedures and
acceptance criteria - Supplementary requirements
1
Under preparation. Current stage is prEN 19:2021.
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EN 12516-1:2014+A1:2018, Industrial valves - Shell design strength - Part 1: Tabulation method for steel
valve shells
EN 12516-2:2014, Industrial valves - Shell design strength - Part 2: Calculation method for steel valve shells
EN 12516-3:2002, Valves - Shell design strength - Part 3: Experimental method
EN 12516-4:2014+A1:2018, Industrial valves - Shell design strength - Part 4: Calculation method for valve
shells manufactured in metallic materials other than steel
EN 13445-2:2021, Unfired pressure vessels - Part 2: Materials
EN 13445-4:2021, Unfired pressure vessels - Part 4: Fabrication
EN 13445-5:2021, Unfired pressure vessels - Part 5: Inspection and testing
EN 13480-2:2017, Metallic industrial piping - Part 2: Materials
EN ISO 5817:2014, Welding - Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding
excluded) - Quality levels for imperfections (ISO 5817:2014)
EN ISO 9606-1:2017, Qualification testing of welders - Fusion welding - Part 1: Steels (ISO 9606-1:2012
including Cor 1:2012 and Cor 2:2013)
EN ISO 9606-2:2004, Qualification test of welders - Fusion welding - Part 2: Aluminium and aluminium
alloys (ISO 9606-2:2004)
EN ISO 9606-3:1999, Approval testing of welders - Fusion welding - Part 3: Copper and copper alloys
(ISO 9606-3:1999)
EN ISO 9606-4:1999, Approval testing of welders - Fusion welding - Part 4: Nickel and nickel alloys
(ISO 9606-4:1999)
EN ISO 9606-5:2000, Approval testing of welders - Fusion welding - Part 5: Titanium and titanium alloys,
zirconium and zirconium alloys (ISO 9606-5:2000)
EN ISO 9712:2012, Non-destructive testing - Qualification and certification of NDT personnel
(ISO 9712:2012)
EN ISO 14732:2013, Welding personnel - Qualification testing of welding operators and weld setters for
mechanized and automatic welding of metallic materials (ISO 14732:2013)
EN ISO 15609-1:2019, Specification and qualification of welding procedures for metallic materials -
Welding procedure specification - Part 1: Arc welding (ISO 15609-1:2019)
EN ISO 15613:2004, Specification and qualification of welding procedures for metallic materials -
Qualification based on pre-production welding test (ISO 15613:2004)
EN ISO 15614-1:2017, Specification and qualification of welding procedures for metallic materials -
Welding procedure test - Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys
(ISO 15614-1:2017, Corrected version 2017-10-01)
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EN ISO 15614-1:2017/A1:2019, Specification and qualification of welding procedures for metallic
materials - Welding procedure test - Part 1: Arc and gas welding of steels and arc welding of nickel and
nickel alloys - Amendment 1 (ISO 15614-1:2017/Amd 1:2019)
EN ISO 15614-2:2005, Specification and qualification of welding procedures for metallic materials -
Welding procedure test - Part 2: Arc welding of aluminium and its alloys (ISO 15614-2:2005)
EN ISO 15614-5:2004, Specification and qualification of welding procedures for metallic materials -
Welding procedure test - Part 5: Arc welding of titanium, zirconium and their alloys (ISO 15614-5:2004)
EN ISO 15614-6:2006, Specification and qualification of welding procedures for metallic materials -
Welding procedure test - Part 6: Arc and gas welding of copper and its alloys (ISO 15614-6:2006)
EN ISO 17635:2016, Non-destructive testing of welds - General rules for metallic materials
(ISO 17635:2016)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 736-1:2018, EN 764-
1:2015+A1:2016, EN 764-2:2012, EN 764-4:2014, EN 764-5:2014, EN 764-7:2002 and the following
apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
valve
piping component which influences the fluid flow by opening, closing or partially obstructing the passage
of the fluid flow or by diverting or mixing the fluid flow
Note 1 to entry: Typical valves are gate valves, globe valves, control valves, check valves, diaphragm valves,
butterfly valves, plug and ball valves as well as non-standard valves either manual or actuator operated and steam
traps, usually covered by a product standard.
[SOURCE: EN 736-1:2018, 3.1 modified — The Note 1 to entry was added here.]
3.2
production welding
welding carried out during manufacturing before final delivery to the purchaser including joint welding
and finishing welding
3.2.1
joint welding
welding used to weld components in order to obtain an integral unit
3.2.2
finishing welding
production welding carried out in order to ensure the agreed quality of the casting
[SOURCE: EN ISO 11970:2016, 3.1.2]
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3.3
repair welding
welding carried out after delivery to the end user, i.e. after the casting has been in service
[SOURCE: EN ISO 11970:2016, 3.2]
3.4
sample
set of one or more units taken from a batch and intended to provide information on the batch
Note 1 to entry: This definition is based on ISO 2859-1.
3.5
material manufacturer
person or organization (like founder, forge-, welding shop) which provides material to the responsible
valve manufacturer
4 Category of valves
A classification under the use of DN and PS and fluid groups 1 and 2 leads to maximum category III. For
respective results, see Annex A.
Valves classified in Article 4 (3) of the European legislation for pressure equipment, are excluded from
conformance to requirements of this document, but are expected to meet the “sound engineering
practice” by conformity to the relevant product standard.
5 Requirements
5.1 Design
5.1.1 General
Valves shall meet the design requirements of this document and are expected to meet the ones referenced
in Annex ZA of their relevant European harmonized standards.
NOTE Annex D contains a summary of European harmonized standards for valves.
The manufacturer shall conduct a hazard analysis for the intended use and for the reasonably foreseeable
conditions.
It is recommended to have this hazard analysis documented.
If the manufacturer identifies hazards which apply to the valve the manufacturer shall take account of his
analysis by appropriate measures in order to reduce or eliminate the hazard identified.
5.1.2 Shell design strength
The shell design strength shall be determined by the following:
a) for steel valves designed by the tabulation method: according to EN 12516-1:2014+A1:2018;
b) for steel valves designed by calculation: according to EN 12516-2:2014;
c) for copper alloy, aluminium and cast iron valves: according to EN 12516-4:2014+A1:2018;
d) if the shell strength resistance is validated by an experimental method: according to
EN 12516-3:2002.
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Appropriate calculation methods other than those specified in the relevant European harmonized
standards giving same level of safety may be applied.
NOTE The valve obturator normally is no part of the shell – except if an “end of line service” is agreed between
valve manufacturer and customer – in this case, all requirements related to the European legislation for pressure
equipment apply to the obturator as well.
WARNING — Basis of design is expected to comply with the requirements of the European legislation for
pressure equipment relative to the design for adequate strength using calculation methods validated, if
necessary, by an experimental method. The use of experimental design methods without calculation is
limited.
5.1.3 Protection against exceeding the allowable limits
If the hazard analysis identifies the allowable limits under reasonably foreseeable conditions could be
exceeded, manufacturer shall fit the valve with a suitable protective device.
5.2 Materials
5.2.1 General requirements
Shell materials shall be selected in accordance with EN 12516-1:2014+A1:2018,
EN 12516-4:2014+A1:2018 or EN 13445-2:2021. Other metallic shell materials may be used providing
they are covered by an EAM or PMA.
The inspection documents of material shall be in accordance with EN 764-5:2014.
NOTE EAM or PMA is not required for valves classified in Article 4 (3) of the European legislation for pressure
equipment.
Where relevant the requirements given in EN 764-4:2014 should be considered.
5.2.2 European harmonized standards
A summary of Harmonized European Material Standards for shell parts is given in Annex B.
5.2.3 European approval of materials (EAM)
EAM for materials are intended for repeated use. They are established in accordance with EN 764-4:2014
and apply to materials or treatment condition and product forms or dimensions not covered in a
European Harmonized Standard.
Annex C contains a link to OJEU Website for European approval of materials (EAM).
5.2.4 Particular Material Appraisal (PMA)
If no material according to a harmonized European material standard is available the manufacturer is
obliged to perform or obtain the required particular material appraisal (PMA).
For valves in categories III or IV, a specific assessment of the PMA shall be performed by the notified body
in charge of conformity assessment procedures for the valves.
PMA apply also as follows:
— a material or a product form or a thickness not covered by a European material Standard or EAM;
— a material specified in a European material Standard or EAM for materials for pressure equipment is
intended in an exceptional case for service conditions outside its specified range of application.
Table 1 shows a selection of EN material standards covering materials for which it is required to obtain
a PMA when used as shell material.
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Table 1 — EN material standards for which a PMA is required
Main material group European Standard / Material
Steels specified in European EN 10025-2:2019 (S235JR, S235JRG2 and S355J2G3)
standards
EN 10222-2:2017+A1:2021 (P250GH)
Cast irons EN 1561:2011
EN 545:2010
Copper EN 1982:2017
EN 12449:2016+A1:2019
EN 12163:2016
EN 12164:2016
5.2.5 Requirements for prevention of brittle fracture at low temperatures
It is the responsibility of the manufacturer to apply appropriate methods for the prevention of brittle
fracture at low temperatures. Temperature limits as given in EN 12516-1:2014+A1:2018 and
EN 12516-4:2014+A1:2018 shall be considered.
The methods to prevent brittle fracture at low temperatures described in EN 13480-2:2017 and
EN 13445-2:2021, Annex B shall be applied.
5.2.6 Selection of bolting material
Material selection for bolting shall be in accordance with EN 10269:2013. Other bolting materials may be
used providing they are covered by an EAM or PMA.
EN 1515-4:2021 provides a possible selection of bolting for equipment subject to the European
legislation for pressure equipment.
5.2.7 Material selection for parts other than shell
Material selection for parts other than shell is the responsibility of the valve manufacturer.
The stuffing box packing shall not cause corrosion on a stem, shaft or pivot.
NOTE Asbestos materials are not allowed.
5.3 Manufacturing
5.3.1 Welding
5.3.1.1 General requirements
Welding of the shell itself or on components of shell shall only be undertaken if the following conditions
are satisfied:
a) a welding procedure specification is held by the manufacturer;
b) the welding procedures selected by the manufacturer are qualified for the field of application;
c) the welders and welding operators are qualified for the work allocated to them and their approval is
valid.
Welding of high-alloy martensitic chromium steels (>13 % Cr) requires particular qualification, except
casting production welds at the foundry.
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General rules for the specification and qualification of welding procedures for metallic materials defined
in EN ISO 15607:2019 shall be taken into account.
NOTE The provision of the fabrication drawings with welding data (weld details, welding procedure and
welding fillers) including information on type and extent of non-destructive testing of welding seams, parts lists
and copies of the welding procedure qualifications can be subject to agreement between manufacturer and
purchaser.
5.3.1.2 Welding procedure specification (WPS)
The manufacturer shall compile welding procedure specifications, in accordance with
EN ISO 15609-1:2019 for all welds.
5.3.1.3 Qualification of welding procedure specifications (WPQR)
Welding procedure specifications to be used shall be qualified by reference to an appropriate WPQR.
For the pressure retaining welds on a shell of a valve, the welding procedure qualification tests shall be
performed in accordance with one of the applicable standards:
a) EN ISO 15614-1:2017 and EN ISO 15614-1:2017/A1:2019, whereby level 2 of welding procedure
qualification tests shall be fulfilled;
NOTE For valves classified in Article 4 (3), the level of welding procedure qualification tests is determined by
the valve manufacturer.
b) EN ISO 15614-2:2005;
c) EN ISO 15614-5:2004;
d) EN ISO 15614-6:2006;
e) EN ISO 15613:2004 (by preproduction tests).
Additional requirements which may be additionally applied in course of a welding procedure
qualification tests are outlined in EN 13445-4:2021, 8.3. It is considered the valve manufacturer's
obligation to take these requirements into account.
For the pressure retaining welds on a shell of valves, in the categories II, III, IV the examiner/examining
body for the welding procedure approval shall be a competent third party organization who shall perform
examination and tests (or have them carried out) as specified in EN ISO 15614-1:2017 and this clause.
NOTE For all test coupons it is permissible for a manufacturer to subcontract preparation of test pieces and
their testing but not the welding of the test pieces.
For welds other than pressure retaining welds directly attached to a shell, welding procedure
specifications may be acceptable by holding welding procedure approval records carried out in
accordance with EN ISO 15611:2003 and EN ISO 15612:2018.
5.3.1.4 Qualification of welders and welding operators
Welders shall be qualified in accordance with the respective applicable part of EN ISO 9606-1:2017,
EN ISO 9606-2:2004, EN ISO 9606-3:1999, EN ISO 9606-4:1999 and EN ISO 9606-5:2000. Qualification
t
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