Forced draught burners for gaseous fuels

This European Standard specifies the terminology, the general requirements for the construction and operation of automatic forced draught gas burners and also the provision of control and safety devices, and the test procedure for these burners.
This standard is applicable to
-   automatic gas burners with a combustion air fan (hereinafter called "burners") as described in 3.1.2 and gas line components, intended for use in appliances of different types, and that are operated with gaseous fuels;
-   total pre mixed burners and nozzle mixed burners.
The standard is applicable to
-   single burners with a single combustion chamber;
-   single fuel and dual fuel burners when operating only on gas;
-   the gas function of dual-fuel burners designed to operate simultaneously on gaseous and liquid fuels, which, for the latter, the requirements of EN 267 also apply.
This European Standard deals with all significant machine hazards, hazardous situations and events relevant to burners, when they are used as intended and under conditions of misuse which are reasonably foreseeable by the manufacturer, see Annex J.
This European Standard specifies the requirements to be met by the manufacturer to ensure the safety during commissioning, start-up, operation, shut-down and maintenance.
This European Standard does not deal with hazards due to specific applications.
It is not applicable to automatic forced draught gas burners which are manufactured before the date of its publication as EN.
This European Standard does not apply to burners specifically designed for use in industrial processes carried out on industrial premises.
This European Standard deals also with the additional requirements for the burners in the scope with pressurised parts and /or firing pressurised bodies, see Annex K.
It deals also with forced draught burners intended to be used with biogenous gaseous fuels, mixtures with line conveyed gas and special gaseous fuels.

Gebläsebrenner für gasförmige Brennstoffe

Die vorliegende Europäische Norm legt die Terminologie für und die allgemeinen Anforderungen an die Konstruktion und den Betrieb von Gasbrennern mit Gebläse und die Bereitstellung von Steuerungs- und Sicherheitseinrichtungen fest sowie das Prüfverfahren für diese Brenner.
Diese Norm gilt für
-   automatische Gasbrenner mit einem Verbrennungsluftgebläse (im Folgenden als Brenner bezeichnet) und gasseitige Ausrüstungsteile, die für die Verwendung in unterschiedlichen Gerätetypen vorgesehen sind und mit gasförmigen Brennstoffen betrieben werden;
-   Vormischbrenner und Düsenbrenner.
Diese Norm gilt für
-   Einzelbrenner mit einem einzigen Feuerraum;
-   Brenner und Zweistoffbrenner für den ausschließlichen Betrieb mit Gas;
-   den Gasbetrieb von Zweistoffbrennern, die für den gleichzeitigen Betrieb mit gasförmigen und flüssigen Brennstoffen konstruiert sind, wobei in letzterem Fall auch die Anforderungen der EN 264 gelten.
Die vorliegende Europäische Norm behandelt sämtliche signifikanten maschinenbezogenen Gefährdungen, Gefährdungssituationen und Gefährdungsereignisse im Hinblick auf Brenner, wenn diese zweckentsprechend sowie unter zweckentfremdeten Bedingungen verwendet werden, die durch den Hersteller vernünftigerweise vorhersehbar sind, siehe Anhang J.
Diese Europäische Norm legt die durch den Hersteller zu erfüllenden Anforderungen fest, die für die Sicherheit während Inbetriebnahme, Anlauf, Betrieb und Abschaltung sowie Wartung erforderlich sind.
Diese Europäische Norm behandelt keine Gefährdungen infolge besonderer Anwendungen.
Diese Europäische Norm gilt nicht für Gasbrenner mit Gebläse, die vor dem Erscheinungsdatum der Norm hergestellt wurden.
Diese Europäische Norm gilt nicht für Brenner, die speziell für den Einsatz in industriellen Prozessen ausgelegt sind, die in industriellen Anlagen erfolgen.
Diese Europäische Norm behandelt darüber hinaus die zusätzlichen Anforderungen für die Brenner mit druckbeaufschlagten Teilen und/oder für die Gasbrenner, die Druckgeräte befeuern, siehe Anhang K.
Diese Europäische Norm behandelt ebenfalls Gebläsebrenner, die für biogene gasförmige Brennstoffe, Mischungen mit leitungsgeführtem Gas und spezielle gasförmige Brennstoffe bestimmt sind.
Diese Europäische Norm behandelt ebenfalls Brenner, die so ausgerüstet sind, um den Anlagennutzungsgrad zu verbessern; siehe Anhang M.

Brûleurs à air soufflé pour combustibles gazeux

La présente Norme européenne prescrit la terminologie, les exigences générales concernant la construction et le fonctionnement des brûleurs à gaz à air soufflé, leur équipement avec des dispositifs de régulation et de sécurité et les méthodes d’essais pour ces brûleurs.
La présente Norme européenne est applicable :
-   aux brûleurs automatiques à gaz avec ventilateur d’air de combustion (dénommés ci-après «brûleurs») et aux composants de la ligne gaz, destinés à être utilisés sur des appareils de différents types et qui fonctionnent avec des combustibles gazeux ;
-   aux brûleurs à pré-mélange total et aux brûleurs à mélange au nez.
La présente Norme européenne est aussi applicable :
-   aux brûleurs individuels alimentant une seule chambre de combustion ;
-   aux brûleurs mono et bicombustibles pour leur fonctionnement exclusif au gaz ;
-   au fonctionnement au gaz des brûleurs bicombustibles conçus pour fonctionner simultanément aux combustibles liquides et gazeux, les exigences de l'EN 264 s'appliquant également aux combustibles liquides.
La présente Norme européenne traite des risques significatifs, situations et événements dangereux liés aux brûleurs lorsqu’ils sont utilisés comme prévu ou dans des conditions anormales raisonnablement prévisibles par le fabricant, voir l’Annexe J.
La présente norme spécifie les exigences à satisfaire par le fabricant afin d’assurer la sécurité lors de la réception, de la mise en route, de l’utilisation, de l’arrêt et de l’entretien.
La présente Norme européenne ne traite pas des risques liés à des applications spécifiques.
La présente Norme européenne n’est pas applicable aux brûleurs fabriqués avant sa date de publication.
La présente Norme européenne ne s’applique pas aux brûleurs spécialement conçus pour une utilisation dans un processus industriel réalisé sur un site industriel.
La présente Norme européenne traite également des exigences complémentaires s’appliquant aux brûleurs avec parties sous pression et/ou installés sur des appareils sous pression, voir l’Annexe K.
La présente Norme européenne traite également des brûleurs à air soufflé destinés à être utilisés avec des biogaz, des mélanges contenant des gaz distribués et des combustibles gazeux spéciaux.
La présente Norme européenne traite également des brûleurs équipés pour augmenter le rendement global de l'appareil ; voir l'Annexe M.

Plinski ventilatorski gorilniki

General Information

Status
Not Published
Public Enquiry End Date
19-May-2012
Current Stage
98 - Abandoned project (Adopted Project)
Start Date
27-May-2016
Due Date
01-Jun-2016
Completion Date
27-May-2016

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Standards Content (Sample)

SLOVENSKI STANDARD
oSIST prEN 676:2012
01-april-2012
Samodejni plinski ventilatorski gorilniki
Automatic forced draught burners for gaseous fuels
Automatische Brenner mit Gebläse für gasförmige Brennstoffe
Brûleurs à air soufflé pour combustibles gazeux
Ta slovenski standard je istoveten z: prEN 676 rev
ICS:
27.060.20 Plinski gorilniki Gas fuel burners
oSIST prEN 676:2012 en,fr,de

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

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oSIST prEN 676:2012
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oSIST prEN 676:2012
EUROPEAN STANDARD
DRAFT
prEN 676
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2012
ICS 27.060.20 Will supersede EN 676:2003+A2:2008
English Version
Forced draught burners for gaseous fuels

Brûleurs à air soufflé pour combustibles gazeux Gebläsebrenner für gasförmige Brennstoffe

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 131.

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, Romania, 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
Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 676:2012: E

worldwide for CEN national Members.
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oSIST prEN 676:2012
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oSIST prEN 676:2012
prEN 676:2012 (E)
Contents

Foreword ..................................................................................................................................................................... 6

1 Scope .............................................................................................................................................................. 8

2 Normative references .................................................................................................................................... 8

3 Terms and definitions ................................................................................................................................. 11

3.1 General terms and definitions .................................................................................................................... 11

3.2 Combustible gases ...................................................................................................................................... 12

3.3 Test rig and combustion chamber ............................................................................................................. 14

3.4 Composition of the gaseous combustion products ................................................................................ 15

3.5 Burner operation.......................................................................................................................................... 15

3.6 Gas line components .................................................................................................................................. 17

3.7 Adjusting, control and safety devices ....................................................................................................... 17

3.8 Sequencing times ........................................................................................................................................ 19

3.9 Combustion .................................................................................................................................................. 20

3.10 Diagrams ...................................................................................................................................................... 20

4 Constructional and operational requirements – safety requirements and/or protective

measures ...................................................................................................................................................... 21

4.1 Conversion to different gases .................................................................................................................... 21

4.2 Construction ................................................................................................................................................ 21

4.3 Equipment .................................................................................................................................................... 23

4.4 Functional and operational requirements ................................................................................................. 33

4.5 Machine safety requirements and/or protective measures ..................................................................... 45

5 Test methods ............................................................................................................................................... 45

5.1 General ......................................................................................................................................................... 45

5.2 Functional tests ........................................................................................................................................... 55

5.3 Operation ...................................................................................................................................................... 56

5.4 Tests to be carried out on the working and test diagrams ..................................................................... 60

5.5 Combustion .................................................................................................................................................. 63

5.6 Start-up ......................................................................................................................................................... 64

5.7 Obtaining the heat input ............................................................................................................................. 64

5.8 Electrical safety ........................................................................................................................................... 65

5.9 Verification of safety and /or protective measures .................................................................................. 66

6 Marking, labelling and packaging .............................................................................................................. 66

6.1 General ......................................................................................................................................................... 66

6.2 Data plate ...................................................................................................................................................... 66

6.3 Other marking .............................................................................................................................................. 67

6.4 Instructions for installation, adjustment, maintenance and operation .................................................. 67

6.5 Packaging ..................................................................................................................................................... 69

6.6 Marking on the packaging .......................................................................................................................... 69

Annex A (normative) Determination of combustion characteristics — Carbon monoxide and

nitrogen oxides and conversion factors ................................................................................................... 70

A.1 CO content, calculation from ml/m into mg/kWh ................................................................................... 70

A.2 NO content, calculation from ml/m into mg/kWh ................................................................................. 71

A.3 Correction for the influence of combustion air temperature and humidity on NO

emissions ..................................................................................................................................................... 71

A.4 NO mean value for evaluating the NO classes ..................................................................................... 72

x x

A.5 CO content ................................................................................................................................................. 72

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A.6 Other conversion factors for emissions, calculated from ml/m into mg/m at 3 % O

reference flue gas conditions ..................................................................................................................... 72

Annex B (informative) Examples of control box sequencing ................................................................................ 74

Annex C (informative) Test gases............................................................................................................................. 75

C.1 General .......................................................................................................................................................... 75

C.2 Conditions for preparation of the test gases ............................................................................................ 75

C.3 Practical application of the test gases ...................................................................................................... 76

Annex D (informative) Gas connections conditions in common use in the various countries ......................... 79

Annex E (informative) Tests ...................................................................................................................................... 80

E.1 Supplementary testing ................................................................................................................................ 80

E.2 Drawing review ............................................................................................................................................ 80

E.3 Individual test and inspection .................................................................................................................... 80

E.4 Test report .................................................................................................................................................... 81

Annex F (informative) Use of alternative gas lines and test documentation ....................................................... 82

F.1 Use of alternative gas lines ........................................................................................................................ 82

F.2 Test documentation ..................................................................................................................................... 82

Annex G (informative) void ........................................................................................................................................ 84

Annex H (informative) Check of the air proving device ......................................................................................... 85

Annex I (informative) Additional recommendations for specific applications .................................................... 86

I.1 General .......................................................................................................................................................... 86

I.2 Pre-heating of the combustion air ............................................................................................................. 86

I.3 Continuous working of the air ventilator .................................................................................................. 86

I.4 Variable excess of combustion air ............................................................................................................ 86

I.5 Burner with start gas flame ........................................................................................................................ 86

I.6 Air filtering .................................................................................................................................................... 87

Annex J (normative) Machine related hazards – safety requirements and/or protective measures ............... 88

J.1 General .......................................................................................................................................................... 88

J.2 List of significant hazards .......................................................................................................................... 88

J.3 Safety requirements and /or protective measures ................................................................................... 88

J.4 Verification of machine safety requirements and/or protective measures ........................................... 92

J.5 Information for use ...................................................................................................................................... 92

Annex K (normative) Additional requirements for burners with pressurised parts and burners

firing pressurised bodies as defined in Pressure Equipment Directive (PED) 97/23/EC ..................... 94

K.1 General .......................................................................................................................................................... 94

K.2 Design ........................................................................................................................................................... 94

K.3 Pressurised parts ........................................................................................................................................ 94

K.4 Electrical safety and gas line components ............................................................................................... 95

K.5 Gas pressure regulator ............................................................................................................................... 96

K.6 High gas pressure over load protection device ....................................................................................... 96

K.7 Automatic safety shut-off valve ................................................................................................................. 96

K.8 Air proving device ....................................................................................................................................... 96

K.9 Automatic burner control system .............................................................................................................. 96

K.10 Means for draining and venting ................................................................................................................. 96

K.11 General functions requirements ................................................................................................................ 97

K.12 External safety limiter ................................................................................................................................. 98

K.13 Design according to Annex L in conjunction with EN 60204-1 ............................................................... 98

K.14 Consideration: safety life cycle .................................................................................................................. 99

K.15 Tests of pressurised parts ........................................................................................................................ 100

K.16 Other marking ............................................................................................................................................ 101

K.17 Instructions for installation, adjustment, maintenance and operation ................................................ 101

Annex L (normative) Electrical requirements – modifications to EN 60204-1 ................................................... 103

L.1 Scope .......................................................................................................................................................... 103

L.2 Normative references ................................................................................................................................ 103

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L.3 Definitions .................................................................................................................................................. 103

L.3.1 Protective System ..................................................................................................................................... 103

L.3.2 Safety device .............................................................................................................................................. 104

L.3.3 Sensor ......................................................................................................................................................... 104

L.3.4 Protective equipment ................................................................................................................................ 104

L.3.5 Actuating element...................................................................................................................................... 104

L.3.6 Control system........................................................................................................................................... 104

L.4 General requirements ............................................................................................................................... 105

L.5 Incoming supply conductor terminations and devices for disconnecting and switching off ........... 107

L.6 Protection against electric shock ............................................................................................................ 107

L.6.1 General ....................................................................................................................................................... 107

L.6.2 Protection against direct contact ............................................................................................................. 108

L.7 Protection of equipment ........................................................................................................................... 108

L.8 Equipotential bonding ............................................................................................................................... 108

L.9 Control circuits and control functions .................................................................................................... 108

Annex M (informative) Burner equipped to increase the efficiency ................................................................... 121

Annex N (informative) Electrical interfaces for burners....................................................................................... 122

Annex O (informative) Environmental checklist EN 676 ...................................................................................... 126

Annex P (informative) A–deviations ....................................................................................................................... 127

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

other provisions of EU Directives ............................................................................................................ 128

Annex ZB (informative) Relationship between this European Standard and the essential safety

requirements of the Pressure Equipment (PED) Directive 97/23/EC.................................................... 131

Annex ZC (informative) void ................................................................................................................................... 139

Annex ZD (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 2006/42/EC Machinery Directive ........................................................... 140

Bibliography ............................................................................................................................................................ 141

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oSIST prEN 676:2012
prEN 676:2012 (E)
Foreword

This document (prEN 676:2012) has been prepared by Technical Committee CEN/TC 131 “Gas burners using

fans”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 676:2003+A2:2008.

This document 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, ZB and ZC, which is an integral part of this

document.
a) Based on ISO 22967 where different to EN 676 such as
i. Update of definitions
ii. Test rig < 2,4 MW and > 2,4 MW
iii. Electrical interfaces for burners
b) Modification

i. Substitution of EN 50156-1 by EN 60204-1 to include international available requirements for

the electrical safety of machines

ii. Annex J is adapted to the new ISO EN 12100 which is substituting EN 1050 which is currently

referenced to in table J.1
iii. Normative formulation of Annex A 'Combustion characteristics'
c) New functions / requirements
i. remote reset
ii. environmental aspects (environmental checklist)
iii. increase of burner efficiency
iv. Terminology for burner load control
This document includes a Bibliography.
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oSIST prEN 676:2012
prEN 676:2012 (E)
Introduction

This European Standard is primarily intended for forced draught gas burners having a combustion air fan,

operated with gaseous fuels, and intended to be marketed as a complete assembly.

EN 437 sets out a system of classification of appliances into categories defined according to the gases and

pressures for which they are designed.

Such a system of classification, when applied to forced draught burners, can lead to difficulties in defining the

precise category to which a particular burner should be allocated. For example many burners are designed to

operate on a wide range of fuel gases with little or no modification other than adjustment of air supply.

The technical committee responsible for the standard decided that the following appliance categories for

forced draught burners should apply:
 single categories: I for natural gas and I for liquefied petroleum gas;
2R 3R
 dual category: II for natural and liquefied petroleum gas.
2R /3R

All the burners of this standard marked with these categories are commissioned on site and the measured

values are recorded in a commissioning report.

However it should be noted that the Gas Appliance Directive requires the specification of the type of gas and

the supply pressure used as well as the burner category.

Forced draught gas burners according to this standard are often used in industrial applications. The safety

principles are the same as for forced draught gas burners used for household/commercial applications.

Industrial forced draught gas burners however should operate safely in their industrial environment and the

risks involved can differ from those for household applications. These industrial forced draught gas burners

can be characterized by the ability to withstand industrial environmental influences, like moisture, high

temperature, electrical and magnetic phenomena, vibrations, etc.

Principal requirements for installation and construction of gas burners and industrial thermal processing are

covered by EN 746-family.

Special requirements for forced draught burners for industrial premises will be given as a note with the

addition "Industrial application".

Further information and application limitation for EN 676 forced draught burners which are used for industrial

application are given in informative annex I.
This document is a type C standard as stated in EN ISO 12100.

The machinery concerned and the extent to which hazards, hazardous situations and hazardous events are

covered are indicated in the scope of this document.

When provisions of this type C standard are different from those which are stated in type A or B standards, the

provisions of this type C standard take precedence over the provisions of the other standard, for machines

that have been designed and built according to the provisions of this type C standard.

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oSIST prEN 676:2012
prEN 676:2012 (E)
1 Scope

This European Standard specifies the terminology, the general requirements for the construction and

operation of forced draught gas burners and also the provision of control and safety devices, and the test

procedure for these burners.
This standard is applicable to

 automatic gas burners with a combustion air fan (hereinafter called "burners") and gas line components,

intended for use in appliances of different types, and that are operated with gaseous fuels;

 total pre-mixed burners and nozzle mixed burners.
The standard is applicable to
 single burners with a single combustion chamber;
 single-fuel and dual-fuel burners when operating only on gas;

 the gas function of dual-fuel burners designed to operate simultaneously on gaseous and liquid fuels,

which, for the latter, the requirements of EN 264 also apply.

This European Standard deals with all significant machine hazards, hazardous situations and events relevant

to burners, when they are used as intended and under conditions of misuse which are reasonably foreseeable

by the manufacturer, see Annex J.

This European Standard specifies the requirements to be met by the manufacturer to ensure the safety during

commissioning, start-up, operation, shut-down and maintenance.
This European Standard does not deal with hazards due to specific applications.

This European Standard is not applicable to forced draught gas burners which are manufactured before the

date of its publication as EN.

This European Standard does not apply to burners specifically designed for use in industrial processes carried

out on industrial premises.

This European Standard deals also with the additional requirements for the burners in the scope with

pressurised parts and /or firing pressurised bodies, see Annex K.

This European Standard deals also with forced draught burners intended to be used with biogenous gaseous

fuels, mixtures with line-conveyed gas and special gaseous fuels.

This European Standard deals also with burners equipped to increase the total appliance efficiency; see

Annex M.
2 Normative references

The following referenced documents are indispensable for the application 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.

EN 88-1, Pressure regulators and associated safety devices for gas appliances — Part 1: Pressure regulators

for inlet pressures up to and including 500 mbar

EN 88-2 Pressure regulators and associated safety devices for gas appliances — Part 2: Pressure regulators

for inlet pressures above 500 mbar up to and including 5 bar
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oSIST prEN 676:2012
prEN 676:2012 (E)
EN 161, Automatic shut-off valves for gas burners and gas appliances
EN 267, Forced draught oil burners — Definitions, requirements, testing, marking

EN 294, Safety of machinery — Safety distance to prevent danger zones from being reached by the upper

limbs

EN 298, Automatic gas burner control systems for gas burners and gas burning appliances with or without

fans
EN 334, Gas pressure regulators for inlet pressures up to 100 bar

EN 953, Safety of machinery — Guards - General requirements for the design and construction of fixed and

movable guards
EN 1088:2008, Safe
...

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