FprEN 12953-6

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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.

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
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 .
...