Shell boilers - Part 7 : Requirements for firing systems for liquid and gaseous fuels for the boilers

These requirements apply to oil and gas firing systems of steam and hot water generators. For multifuel firing systems using separate or combined burners these requirements shall apply to the oil and/or gas firing part involved. Where several fuels are burnt simultaneously, improved safety measures may be necessary, especially in respect to limitation of heat input into the firing system and proper air supply to the individual fuels.

Großwasserraumkessel - Teil 7 : Anforderungen an Feuerungsanlagen für flüssige und gasförmige Brennstoffe für den Kessel

Diese Anforderungen gelten für Öl- und Gasfeuerungsanlagen an Dampf- und Heißwasserzeugern. Für kombinierte Feuerungsanlagen mit getrennten oder kombinierten Brennern gelten diese Anforderungen für den Öl- und/oder Gasfeuerungsteil. Wenn verschiedene Brennstoffe gleichzeitig verbrannt werden, können erhöhte Sicherheitsmaßnahmen nötig werden, vorzugsweise im Hinblick auf die Begrenzung der Wärmeleistung der Feuerungsanlage und richtige Lufzuführung zu den einzelnen Brennstoffen.

Chaudières à tubes de fumée - Partie 7 : Exigences pour les équipements de chauffe pour combustibles gazeux et liquides de la chaudière

La présente Norme européenne spécifie les exigences applicables aux équipements de chauffe pour fioul et combustibles gazeux des chaudières à tubes de fumée indépendamment de leur niveau de surveillance. En ce qui concerne les équipements de chauffe polycombustibles utilisant des brûleurs séparés ou combinés, ces prescriptions s'appliquent à l'élément de chauffe pour fioul et/ou gaz impliqué.
Lorsque plusieurs combustibles sont brûlés simultanément, des mesures de sécurité améliorées peuvent être requises, en particulier pour ce qui concerne la limitation de l'apport calorifique à l'équipement de chauffe et l'alimentation en air appropriée pour chaque combustible.
Pour les équipements de chauffe à fioul et gaz les prescriptions de l'EN 267 ou l'EN 676 s'appliquent.

Mnogovodni kotli - 7. del: Zahteve za gorilnike kotlov na tekoča in plinasta goriva

General Information

Status
Published
Publication Date
21-May-2002
Current Stage
9092 - Decision on results of review/2YR ENQ - revise - Review Enquiry
Completion Date
07-Jun-2022

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SLOVENSKI STANDARD
SIST EN 12953-7:2002
01-november-2002

Mnogovodni kotli - 7. del: Zahteve za gorilnike kotlov na tekoča in plinasta goriva

Shell boilers - Part 7 : Requirements for firing systems for liquid and gaseous fuels for

the boilers

Großwasserraumkessel - Teil 7 : Anforderungen an Feuerungsanlagen für flüssige und

gasförmige Brennstoffe für den Kessel

Chaudieres a tubes de fumée - Partie 7 : Exigences pour les équipements de chauffe

pour combustibles gazeux et liquides de la chaudiere
Ta slovenski standard je istoveten z: EN 12953-7:2002
ICS:
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
SIST EN 12953-7:2002 en

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

---------------------- Page: 1 ----------------------
SIST EN 12953-7:2002
---------------------- Page: 2 ----------------------
SIST EN 12953-7:2002
EUROPEAN STANDARD
EN 12953-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2002
ICS 27.060.30; 27.100
English version
Shell boilers - Part 7 : Requirements for firing systems for liquid
and gaseous fuels for the boilers

Chaudières à tubes de fumée - Partie 7 : Exigences pour Großwasserraumkessel - Teil 7 : Anforderungen an

les équipements de chauffe pour combustibles gazeux et Feuerungsanlagen für flüssige und gasförmige Brennstoffe

liquides de la chaudière für den Kessel
This European Standard was approved by CEN on 15 May 2002.

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. Up-to-date lists and bibliographical references concerning such national

standards may be obtained on application to the Management Centre or to any CEN member.

This European Standard exists 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 Management Centre has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,

Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12953-7:2002 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 12953-7:2002
EN 12953-7:2002 (E)
Contents
page

Foreword ..................................................................................................................................................................... 3

1 Scope.............................................................................................................................................................. 4

2 Normative references.................................................................................................................................... 4

3 Terms and definitions ................................................................................................................................... 4

4 Fuel supply..................................................................................................................................................... 6

4.1 Fuel transfer and preparation ...................................................................................................................... 6

4.2 Fuel lines ........................................................................................................................................................ 6

4.3 Safety shut-off devices (Safety trip valves)................................................................................................ 7

5 Air supply, air/fuel ratio ................................................................................................................................ 7

6 Firing system ................................................................................................................................................. 8

6.1 Burners........................................................................................................................................................... 8

6.2 Inspection openings...................................................................................................................................... 8

6.3 Purging, start-up and shutdown.................................................................................................................. 8

6.4 Common stack for several firing systems.................................................................................................. 8

6.5 Fuels ............................................................................................................................................................... 8

Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other

provisions of EU Directives.......................................................................................................................... 9

Bibliography.............................................................................................................................................................. 10

---------------------- Page: 4 ----------------------
SIST EN 12953-7:2002
EN 12953-7:2002 (E)
Foreword

This document (EN 12953-7:2002) has been prepared by Technical Committee CEN/TC 269 "Shell and water-tube

boilers", the secretariat of which is held by DIN.

This European Standard has been prepared under a mandate given to CEN by the European Commission and the

European Free Trade Association, and supports essential requirements of EU Directive(s).

For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard.

This European Standard shall be given the status of a national standard, either by publication of an identical text or

by endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latest

by November 2002.

The European Standard 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 boiler feedwater and boiler water quality.
 Part 11: Acceptance tests.
 Part 12: Requirements for firing systems for solid fuels for the boiler.
 Part 13: Operating instructions.

CR 12953-14: Guidelines for the involvement of an inspection body independent of the manufacturer.

Although these Parts can be obtained separately, it should be recognized that the Parts are inter-dependent. As

such, the design and manufacture of shell boilers requires the application of more than one Part in order for the

requirements of the standard to be satisfactorily fulfilled.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,

France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,

Sweden, Switzerland and the United Kingdom.
---------------------- Page: 5 ----------------------
SIST EN 12953-7:2002
EN 12953-7:2002 (E)
1 Scope

This Part of this European Standard specifies requirements for firing systems for oil and gaseous fuels applicable to

shell boilers, as defined in EN 12953-1, irrespective of the degree of supervision. For multifuel firing systems using

separate or combined burners, these requirements apply to the oil and/or gas firing part involved.

This Part of this European Standard specifies the improved safety measures required when several fuels are burnt

simultaneously.
2 Normative references

This European Standard incorporates, by dated or undated reference, provisions from other publications. These

normative references are cited at the appropriate places in the text and the publications are listed hereafter. For

dated references, subsequent amendments to or revisions of any of these publications apply to this European

Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the

publication referred to applies (including amendments).

EN 267, Forced draught oil burners - Definitions, requirements, testing, marking.

EN 676, Automatic forced draught burners for gaseous fuels.
EN 12953-1, 
 
 General.
3 Terms and definitions

For the purposes of this Part of this European Standard, the following terms and definitions apply.

3.1
liquid fuels

light fuel oils, and heavy fuel oils which need preheating for proper atomisation

3.2
gaseous fuels
standardized quality differentiated mainly by their relative density
3.2.1
light gases

with relative density below 1,3 e.g. natural gas, coke-oven gas, blast-furnace gas

NOTE Natural gas in accordance with ISO 6976.
3.2.2
heavy gases

with relative densities exceeding 1,3 e.g. liquefied petroleum gases, the main components of which are propane

and butane
3.3
burners

devices for the introduction of fuel and air into a combustion chamber at required velocities, turbulence and local

fuel concentration to establish and maintain proper ignition and stable combustion of the fuel

3.4
burner management system

performs a predetermined sequence of actions and always operates in conjunction with a flame monitor that reacts

to signals from control and safety devices, gives control commands, controls the start-up sequence, supervises the

burner operation, and causes controlled shutdown and lockout
---------------------- Page: 6 ----------------------
SIST EN 12953-7:2002
EN 12953-7:2002 (E)
3.5
firing system

total equipment required for the combustion of fuels including the installations for the storage, preparation, and

supply of fuels, the combustion air supply, the burner(s), the flue gas discharge, and all related control and moni-

toring devices

NOTE A flue gas re-circulation system can be installed as an integral part of the firing system.

3.6
firing system heat input

heat input into the combustion chamber, including the reserve required for load control at which the boiler can be

safely operated
NOTE The mass flow of the fuel supplied multiplied by the net calorific value.
3.7
flame monitor

device which detects the presence or absence or break-away of the flame and transmits a signal to the control de-

vice, and generally, consists of a sensing device (if necessary with amplifier) and switching equipment

3.8
flue gas re-circulation

return of flue gas from downstream of the flame zone or from the flue gas exit by hydrodynamic pressure difference

or a separate fan into the air register of the burner or directly into the combustion chamber

3.9
limiters

device that, on reaching a fixed value (e.g. pressure, temperature, flow, water level) is used to interrupt and lock-out

the energy supply and requires manual unlocking before restart
3.10
lock-out
isolation of energy supply which requires a manual intervention to reinstate
NOTE See EN 676 for definition of non-volatile lock-out.
3.11
master fuel trip

device for rapid automatic shut-off of all fuel supplies to the boiler area in the event of danger which may act by

automatic, manual or emergency switch initiation even if a possible electrical or mechanical fault occurs

3.12
firing rate of the burner
rate at which the burner may be operated
3.13
multi-fuel burners

burners in which more than one fuel is burned either simultaneously or separately

3.14
purging of the flue gas passes

forced flow of air through the combustion chamber, flue gas passes, and associated ducts which effectively re-

moves any combustible products and replaces them with air
3.16
relative density

ratio of the density of the gas to the density of dry air under equal conditions of pressure and temperature

---------------------- Page: 7 ----------------------
SIST EN 12953-7:2002
EN 12953-7:2002 (E)
3.17
return-flow atomizer

oil burners where a portion of the quantity of oil supplied to the burner via the flow line does not flow from a burner

gun into the combustion chamber, but flows backwards into the storage tank or the suction side of the pump via a

separate return line, the output being adjusted by a control device in the return line

4 Fuel supply
4.1 Fuel transfer and p
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Großwasserraumkessel - Teil 7 : Anforderungen an Feuerungsanlagen für flüssige und gasförmige Brennstoffe für den KesselChaudieres a tubes de fumée - Partie 7 : Exigences pour les équipements de chauffe pour combustibles gazeux et liquides de la chaudiereShell boilers - Part 7 : Requirements for firing systems for liquid and gaseous fuels for the boilers27.060.30Grelniki vode in prenosniki toploteBoilers and heat exchangersICS:Ta slovenski standard je istoveten z:EN 12953-7:2002SIST EN 12953-7:2002en01-november-2002SIST EN 12953-7:2002SLOVENSKI

STANDARD
SIST EN 12953-7:2002

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12953-7May 2002ICS 27.060.30; 27.100English versionShell boilers - Part 7 : Requirements for firing systems for liquidand gaseous fuels for the boilersChaudières à tubes de fumée - Partie 7 : Exigences pourles équipements de chauffe pour combustibles gazeux etliquides de la chaudièreGroßwasserraumkessel - Teil 7 : Anforderungen anFeuerungsanlagen für flüssige und gasförmige Brennstoffefür den KesselThis European Standard was approved by CEN on 15 May 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12953-7:2002 ESIST EN 12953-7:2002

EN 12953-7:2002 (E)2ContentspageForeword.....................................................................................................................................................................31Scope..............................................................................................................................................................42Normative references....................................................................................................................................43Terms and definitions...................................................................................................................................44Fuel supply.....................................................................................................................................................64.1Fuel transfer and preparation......................................................................................................................64.2Fuel lines........................................................................................................................................................64.3Safety shut-off devices (Safety trip valves)................................................................................................75Air supply, air/fuel ratio................................................................................................................................76Firing system.................................................................................................................................................86.1Burners...........................................................................................................................................................86.2Inspection openings......................................................................................................................................86.3Purging, start-up and shutdown..................................................................................................................86.4Common stack for several firing systems..................................................................................................86.5Fuels...............................................................................................................................................................8Annex ZA (informative)

Clauses of this European Standard addressing essential requirements or otherprovisions of EU Directives..........................................................................................................................9Bibliography..............................................................................................................................................................10SIST EN 12953-7:2002

EN 12953-7:2002 (E)3ForewordThis document (EN 12953-7:2002) has been prepared by Technical Committee CEN/TC 269 "Shell and water-tubeboilers", the secretariat of which is held by DIN.This European Standard has been prepared under a mandate given to CEN by the European Commission and theEuropean Free Trade Association, and supports essential requirements of EU Directive(s).For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard.This European Standard shall be given the status of a national standard, either by publication of an identical text orby endorsement, at the latest by November 2002, and conflicting national standards shall be withdrawn at the latestby November 2002.The European Standard 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 boiler feedwater and boiler water quality. Part 11:Acceptance tests. Part 12:Requirements for firing systems for solid fuels for the boiler. Part 13:Operating instructions.CR 12953-14:Guidelines for the involvement of an inspection body independent of the manufacturer.Although these Parts can be obtained separately, it should be recognized that the Parts are inter-dependent. Assuch, the design and manufacture of shell boilers requires the application of more than one Part in order for therequirements of the standard to be satisfactorily fulfilled.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain,Sweden, Switzerland and the United Kingdom.SIST EN 12953-7:2002

EN 12953-7:2002 (E)41 ScopeThis Part of this European Standard specifies requirements for firing systems for oil and gaseous fuels applicable toshell boilers, as defined in EN 12953-1, irrespective of the degree of supervision. For multifuel firing systems usingseparate or combined burners, these requirements apply to the oil and/or gas firing part involved.This Part of this European Standard specifies the improved safety measures required when several fuels are burntsimultaneously.2 Normative referencesThis European Standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references, the latest edition of thepublication referred to applies (including amendments).EN 267, Forced draught oil burners - Definitions, requirements, testing, marking.EN 676, Automatic forced draught burners for gaseous fuels.EN 12953-1, General.3 Terms and definitionsFor the purposes of this Part of this European Standard, the following terms and definitions apply.3.1liquid fuelslight fuel oils, and heavy fuel oils which need preheating for proper atomisation3.2gaseous fuelsstandardized quality differentiated mainly by their relative density3.2.1light gaseswith relative density below 1,3 e.g. natural gas, coke-oven gas, blast-furnace gasNOTENatural gas in accordance with ISO 6976.3.2.2heavy gaseswith relative densities exceeding 1,3 e.g. liquefied petroleum gases, the main components of which are propaneand butane3.3burnersdevices for the introduction of fuel and air into a combustion chamber at required velocities, turbulence and localfuel concentration to establish and maintain proper ignition and stable combustion of the fuel3.4burner management systemperforms a predetermined sequence of actions and always operates in conjunction with a flame monitor that reactsto signals from control and safety devices, gives control commands, controls the start-up sequence, supervises theburner operation, and causes controlled shutdown and lockoutSIST EN 12953-7:2002

EN 12953-7:2002 (E)53.5firing systemtotal equipment required for the combustion of fuels including the installations for the storage, preparation, andsupply of fuels, the combustion air supply, the burner(s), the flue gas discharge, and all related control and moni-toring devicesNOTEA flue gas re-circulation system can be installed as an integral part of the firing system.3.6firing system heat inputheat input into the combustion chamber, including the reserve required for load control at which the boiler can besafely operatedNOTEThe mass flow of the fuel supplied multiplied by the net calorific value.3.7flame monitordevice which detects the presence or absence or break-away of the flame and transmits a signal to the control de-vice, and generally, consists of a sensing device (if necessary with amplifier) and switching equipment3.8flue gas re-circulationreturn of flue gas from downstream of the flame zone or from the flue gas exit by hydrodynamic pressure differenceor a separate fan into the air register of the burner or directly into the combustion chamber3.9limitersdevice that, on reaching a fixed value (e.g. pressure, temperature, flow, water level) is used to interrupt and lock-outthe energy supply and requires manual unlocking before restart3.10lock-outisolation of energy supply which requires a manual intervention to reinstateNOTESee EN 676 for definition of non-volatile lock-out.3.11master fuel tripdevice for rapid automatic shut-off of all fuel supplies to the boiler area in the event of danger which may act byautomatic, manual or emergency switch initiation even if a possible electrical or mechanical fault occurs3.12firing rate of the burnerrate at which the burner may be operated3.13multi-fuel burnersburners in which more than one fuel is burned either simultaneously or separately3.14purging of the flue gas passesforced flow of air through the combustion chamber, flue gas passes, and associated ducts which effectively re-moves any combustible products and replaces them with air3.16relative densityratio of the density of the gas to the density of dry air under equal conditions of pressure and temperatureSIST EN 12953-7:2002

EN 12953-7:2002 (E)63.17return-flow atomizeroil burners where a portion of the quantity of oil supplied to the burner via the flow line does not flow from a burnergun into the combustion chamber, but flows backwards into the storage tank or the suction side of the pump via aseparate return line, the output being adjusted by a control device in the return line4 Fuel supply4.1 Fuel transfer and preparation4.1.1The fuel supply line shall be equipped with a master fuel trip which shall be positioned in a safe location. Itshall cut off the fuel supply to

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