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CEN

EN 12953-6:2024

(Main)

Shell Boilers - Part 6: Requirements for equipment for the boiler

Shell Boilers - Part 6: Requirements for equipment for the boiler

This part of this European Standard specifies the minimum requirements for safety related equipment for shell boilers as defined in EN 12953-1, to ensure the boiler operates within the allowable limits (pressure, temperature, etc.) and if the limits are exceeded the energy supply shall be interrupted and locked out without manual (human) intervention at the boiler.
NOTE 1   The maximum time of operation without manual (human) intervention should be defined for each boiler system.
NOTE 2   Annex C (informative) gives recommendations of operation and testing of the boiler system with a maximum time of operation without manual (human) intervention of 72 hours.

Großwasserraumkessel - Teil 6: Anforderungen an die Ausrüstung für den Kessel

Chaudières à tubes de fumée - Partie 6: Exigences pour l'équipement de la chaudière

Mnogovodni kotli - 6. del: Zahteve za opremo kotla

General Information

Status
Not Published
Publication Date
26-Nov-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
6055 - CEN Ratification completed (DOR) - Publishing
Start Date
20-Oct-2024
Due Date
29-Jan-2024
Completion Date
20-Oct-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
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
kSIST FprEN 12953-6:2024 - Shell Boilers - Part 6: Requirements for equipment for the boiler

Relations

Revises
EN 12953-6:2011 - Shell Boilers - Part 6: Requirements for equipment for the boiler
Effective Date
19-Jan-2023

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SLOVENSKI STANDARD
oSIST prEN 12953-6:2023
01-junij-2023
Mnogovodni kotli - 6. del: Zahteve za opremo kotla
Shell Boilers - Part 6: Requirements for equipment for the boiler
Großwasserraumkessel - Teil 6: Anforderungen an die Ausrüstung für den Kessel
Chaudières à tube de fumée - Partie 6: Exigences pour l'équipement de la chaudière
Ta slovenski standard je istoveten z: prEN 12953-6
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
oSIST prEN 12953-6:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 12953-6:2023
oSIST prEN 12953-6:2023
DRAFT
EUROPEAN STANDARD
prEN 12953-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2023
ICS Will supersede EN 12953-6:2011
English Version
Shell Boilers - Part 6: Requirements for equipment for the
boiler
Chaudières à tube de fumée - Partie 6: Exigences pour Großwasserraumkessel - Teil 6: Anforderungen an die
l'équipement de la chaudière Ausrüstung für den Kessel
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 12953-6:2023 E
worldwide for CEN national Members.

oSIST prEN 12953-6:2023
prEN 12953-6:2023 (E)
Contents
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 General requirements for steam boilers and hot water boilers . 11
4.1 Safeguards (safety valves) against excessive pressure . 11
4.2 Materials for valves, fittings, flanges and bolting . 11
4.3 Protective systems . 11
4.4 Energy supply . 12
4.4.1 General . 12
4.4.2 Start up . 13
4.4.3 Normal shutdown . 13
4.5 Flue-gas heated economizers. 13
4.6 Drain and blowdown devices . 13
4.7 Water quality . 14
4.8 Water quality protection . 14
4.8.1 Conductivity in steam boiler water . 14
4.8.2 Condensate in steam boiler plants . 15
4.8.3 Water circulating system in hot water boiler plants . 15
4.8.4 Make-up water or feed water . 15
4.9 Furnace temperature monitoring system . 16
5 Special requirements for steam boilers . 17
5.1 Water level indication . 17
5.2 Steam pressure and temperature indication . 20
5.3 Valves for connections . 20
5.3.1 Steam outlets . 20
5.3.2 Feed pipe connections . 20
5.4 Feed water supply . 21
5.5 Feed water control . 21
5.6 Limiting and monitoring devices. 21
5.6.1 Low and high water level protection . 21
5.6.2 Pressure limitation . 22
5.6.3 Temperature limitation . 22
5.6.4 Flow monitoring device . 22
5.7 Electrically heated steam boilers . 22
6 Special requirements for hot water boilers . 23
6.1 Hot water generating systems . 23
6.2 Expansion and feed lines for open vented systems . 25
6.3 Water supply . 26
6.4 Water level indication . 26
6.5 Limiting and monitoring devices. 27
6.5.1 Low water protection . 27
6.5.2 Pressure and temperature limitation . 27
6.5.3 Flow monitoring device . 27
6.5.4 High water level protection . 28
6.6 Vent valves . 28
oSIST prEN 12953-6:2023
prEN 12953-6:2023 (E)
6.7 Pressure and temperature indication . 28
6.8 Electrically heated hot water boilers . 28
6.9 Parallel mode of operation of hot water boilers . 29
7 Operational aspects including maintenance and testing . 29
8 Alarms and monitoring from the boiler plant . 30
Annex A (informative) Typical examples of steam and hot water boiler systems . 31
A.1 General . 31
A.2 Key to figures. 31
A.3 Plant with open vented system . 33
A.4 Plant with closed system . 34
A.4.1 Hot water system with external pressure generating and expansion system . 34
A.4.2 Hot water system with internal pressure generating and expansion system - Steam
cushion in the boiler . 35
A.4.3 Steam boiler . 36
A.5 Superheater and economizer . 37
A.5.1 Superheater . 37
A.5.2 Economizer . 38
Annex B (informative) Dimensioning of expansion space . 39
B.1 General . 39
B.2 Required data . 39
B.3 Formulas for dimensioning . 40
Annex C (informative) Aspects of boiler operation . 42
C.1 General . 42
C.2 Maintenance . 42
C.3 Boiler operation and testing . 42
Annex D (informative) Drain and blowdown devices. 47
D.1 General . 47
D.2 Design of the drain and blowdown devices . 47
Annex E (informative) Alarms and monitoring from the boiler plant. 49
E.1 General . 49
E.2 Conditions for alarms and monitoring . 49
Annex F (normative) Requirements for monitoring devices .
...

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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).
It is the manufacturer's responsibility, in addition to complying with the requirements of this standard, to take into consideration special measures which could be necessary in order to achieve by manufacturing the required level of safety in accordance with the EU Directive 97/23/EC (PED).
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This European Standard specifies requirements for both directly fired and electrically heated boilers including Low Pressure Boilers (LPB, see 3.6) as well as for heat recovery boilers with a gas-side pressure not exceeding 0,5 bar of cylindrical design, constructed from carbon or carbon manganese steels by fusion welding and a design pressure not exceeding 40 bar. The boilers covered by this European Standard are intended for land use for providing steam or hot water (typical examples are shown in Figures 1 to 6).
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Where a particular boiler is a combination of shell and water-tube design then the water-tube standard series EN 12952 is used in addition to this European Standard. One such example of this combination is shown in Figure 3.
This European Standard applies to the generator, from the feed-water or water inlet connection to the steam or water outlet connection and to all other connections, including the valves and steam and water fittings. If welded ends are used, the requirements specified herein begin or end at the weld where flanges, if used, would have been fitted.
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