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FprEN 12953-9

(Main)

Shell boilers - Part 9: Requirements for limiting devices of the boiler and accessories

Shell boilers - Part 9: Requirements for limiting devices of the boiler and accessories

This European Standard specifies requirements for limiters (or limiting devices) which are incorporated into safety systems for shell boilers as defined in EN 12953-1. A limiter (or limiting device) can be either: - a safety accessory as defined in the Pressure Equipment Directive, Article 1, clause 2.1.3, and needs to include the safety logic and final actuator, or - one element of a safety system, for example, a self-monitoring water level sensor used as part of a safety accessory as defined in the Pressure Equipment Directive, Article 1, clause 2.1.3. The overall boiler protection function needs to be provided in association with additional safety logic (where appropriate) and a final actuator. The design requirements and examination of functional capability for the limiters are covered in this European Standard. For an explanation of the extent of the limiter (or limiting device) see Figure A.1.

Großwasserraumkessel ­ Teil 9: Anforderungen an Begrenzungseinrichtungen an Kessel und Zubehör

Chaudières à tubes de fumée ­ Partie 9: Exigences pour les dispositifs de limitation de la chaudière et de ses accessoires

Mnogovodni kotli - 9. del: Zahteve za omejilne naprave kotla in opremo

General Information

Status
Not Published
Publication Date
18-Sep-2024
ICS
27.060.30 - Boilers and heat exchangers
Technical Committee
CEN/TC 269 - Shell and water tube boilers
Drafting Committee
CEN/TC 269/WG 2 - Shell boilers
Current Stage
4599 - Dispatch of FV draft to CMC - Finalization for Vote
Start Date
08-Mar-2024
Due Date
28-Aug-2023
Completion Date
08-Mar-2024
Directive
2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
Mandate
M/071 - Mandate to CEN for standardization in the field of Pressure equipment
M/601 - COMMISSION IMPLEMENTING DECISION of 1.3.2024 on a standardisation request to the European Committee for Standardization and the European Committee for Electrotechnical Standardization as regards pressure equipment and assemblies in support of Directive 2014/68/EU of the European Parliament and of the Council
Ref Project
oSIST prEN 12953-9:2023 - Shell boilers - Part 9: Requirements for limiting devices of the boiler and accessories

Relations

Revises
EN 12953-9:2007 - Shell boilers - Part 9: Requirements for limiting devices of the boiler and accessories
Effective Date
19-Jan-2023

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SLOVENSKI STANDARD
01-junij-2023
Mnogovodni kotli - 9. del: Zahteve za omejilne naprave kotla in opremo
Shell boilers - Part 9: Requirements for limiting devices of the boiler and accessories
Großwasserraumkessel ­ Teil 9: Anforderungen an Begrenzungseinrichtungen an Kessel
und Zubehör
Chaudières à tubes de fumée ­ Partie 9: Exigences pour les dispositifs de limitation de
lachaudière et de ses accessoires
Ta slovenski standard je istoveten z: prEN 12953-9
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
prEN 12953-9
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2023
ICS 27.060.30 Will supersede EN 12953-9:2007
English Version
Shell boilers - Part 9: Requirements for limiting devices of
the boiler and accessories
Chaudières à tubes de fumée - Partie 9: Exigences pour Großwasserraumkessel - Teil 9: Anforderungen an
les dispositifs de limitation de lachaudière et de ses Begrenzungseinrichtungen an Kessel und Zubehör
accessoires
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 269.
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 12953-9:2023 E
worldwide for CEN national Members.

prEN 12953-9:2023 (E)
⁠⁠⁠Contents Page
⁠⁠⁠European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Requirements for limiter . 10
4.1 General . 10
4.2 Components . 11
4.3 Materials and design . 12
4.4 Electrical equipment . 13
4.5 Fault assessment . 14
4.5.1 General . 14
4.5.2 Fault models and exclusions . 17
4.6 Marking . 19
4.7 Operating instructions . 19
4.8 Type examination of functional capability . 20
4.9 Routine testing for final assessment . 22
5 Special requirements for water level limiters . 23
5.1 Design . 23
5.1.1 General . 23
5.1.2 Internal protection tubes . 23
5.1.3 External chambers . 23
5.2 Floating devices . 24
5.3 Level electrode devices . 24
5.4 Additional requirements for differential pressure sensors . 26
5.5 Type examination of functional capability . 26
6 Special requirements for pressure limiters . 28
6.1 Design . 28
6.2 Fault exclusion of mechanical failure of moving parts . 29
6.3 Type examination of functional capability . 29
7 Special requirements for temperature limiters . 31
7.1 Design . 31
7.2 Type examination of functional capability . 31
8 Special requirements for water conductivity limiters . 31
8.1 ⁠⁠⁠ Internally mounted transducers . 31
8.2 ⁠⁠⁠ ⁠⁠⁠Externally mounted transducers . 31
8.3 Transducers . 32
8.4 Type examination of functional capability of water conductivity limiter . 32
Annex A (informative) Limiting devices . 33
Annex B (informative) Example of an examination plan . 34
Annex C (informative) Marking of limiters . 36
prEN 12953-9:2023 (E)
Annex D (normative) Immunity against electrical and electromagnetic influences —
Requirements and testing . 39
D.1 General . 39
D.2 Immunity against mains voltage variations . 39
D.3 Immunity against short-time voltage interruptions and reductions . 40
D.4 Immunity against mains frequency changes . 40
D.5 Immunity against electrostatic discharge (ESD) . 40
D.6 Immunity against fast transient disturbance variables (burst) . 41
D.7 Immunity against surges . 41
D.8 Immunity against high-frequency electromagnetic fields . 42
D.9 Immunity against conducted disturbances induced by high frequency fields . 42
D.10 Immunity against power frequency magnetic fields . 43
Annex E (informative) Deterministic or probabilistic procedures for limiter safety cases . 44
E.1 General . 44
E.2 Relationships . 44
E.2.1 Type test . 44
E.2.2 Determination of characteristic data for use in protective circuits with SIL
classification (SIL = safety integrity level). 44
Annex F (normative) Requirements and tests of electrical safety . 45
Annex G (informative) Significant technical changes between this document and the
previous edition . 47
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/68/EU aimed to be covered . 48
⁠⁠⁠Bibliography . 49

prEN 12953-9:2023 (E)
⁠⁠⁠European foreword
This document (prEN 12953-9:2023) has been prepared by Technical Committee CEN/TC 269 “Shell and
water-tube boilers”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 12953-9:2007.
Annex G provides details of significant technical changes between this European Standard and the
previous edition.
The European Standard series EN 12953 concerning shell boilers consists of the following Parts:
— Part 1: General
— Part 2: Materials for pressure parts of boilers and accessories
— Part 3: Design and calculation for pressure parts
— Part 4: Workmanship and construction of pressure parts of the boiler
— Part 5: Inspection during construction, documentation and marking of pressure parts of the boiler
— Part 6: Requirements for equipment for the boiler
— Part 7: Requirements for firing systems for liquid and gaseous fuels for the boiler
— Part 8: Requirements for safeguards against excessive pressure
— Part 9: Requirements for limiting devices of the boiler and accessories
— Part 10: Requirements for feedwater and boiler water quality
— Part 11: Acceptance tests
— Part 12: Requirements for grate firing systems for solid fuels for the boiler
— Part 13: Operating instructions
Although these Parts may be obtained separately, it should be recognized that the Parts are
interdependent. As such, the design and manufacture of shell boilers requires the application of more
than one part in order for the requirements of the European Standard to be satisfactorily fulfilled.
NOTE A “Boiler Helpdesk” has been established in CEN/TC 269 which can be contacted for any questions
regarding the application of the European Standards series EN 12952 and EN 12953 see the following website:
http://www.boiler-helpdesk.din.de.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European
...

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1.1   General
This European Standard applies to shell boilers with volumes in excess of 2 litres for the generation of steam and/or hot water at a maximum allowable pressure greater than 0,5 bar and with a temperature in excess of
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The purpose of this European Standard is to ensure that the hazards associated with the operation of shell boilers are reduced to a minimum and that adequate protection is provided to contain the hazards that still prevail when the shell boiler is put into service. This protection will be achieved by the proper application of the design, manufacturing, testing and inspection methods and techniques incorporated in the various parts of this European Standard. Where appropriate, adequate warning of residual hazards and the potential for misuse are given in the training and operating instructions and local to the equipment concerned (see EN 12953-7 and EN 12953-8).
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