prEN 676

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
• Publication Date: 24-Dec-2013
• Withdrawal Date: 24-Jun-2014
• ICS: 27.060.20 - Gas fuel burners
• Technical Committee: CEN/TC 131 - Gas burners using fans
• Drafting Committee: CEN/TC 131 - Gas burners using fans
• Current Stage: 4098 - Decision to abandon - Enquiry
• Start Date: 16-Dec-2014
• Completion Date: 14-Apr-2025
• Directive: 2006/42/EC - Directive 2006/42/EC of the European Parliament and of the Council of 17 May 2006 on machinery, and amending Directive 95/16/EC (recast)
• Directive: 2009/142/EC - DIRECTIVE 2009/142/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 30 November 2009 relating to appliances burning gaseous fuels
• Directive: 90/396/EEC - Appliances burning gaseous fuels
• Directive: 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
• Mandate: M/079 - Mandate to CEN and CENELEC for standardization in the field of machines
• Mandate: M/396 - Mandate to CEN and Cenelec for standardisation in the field of machinery
• Mandate: M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels
• Ref Project: oSIST prEN 676:2012 - Forced draught burners for gaseous fuels

Relations

• Revises: EN 676:2003+A2:2008 - Automatic forced draught burners for gaseous fuels
• Effective Date: 19-Jan-2023

Overview

The European Standard prEN 676 titled Forced Draught Burners for Gaseous Fuels outlines essential specifications for the design, construction, operation, and safety of automatic forced draught gas burners. Developed by the European Committee for Standardization (CEN), this standard applies primarily to burners equipped with combustion air fans and intended for use with various gaseous fuels. It covers a wide range of burner types, including total premixed and nozzle mixed burners, as well as single and dual fuel burners operating solely on gas.

This standard ensures that manufacturers comply with stringent safety and operational requirements during commissioning, start-up, operation, shut-down, and maintenance. It addresses critical machine hazards and safety measures to mitigate risks associated with burners in typical and certain foreseeable misuse conditions.

Key Topics

• Terminology and Definitions
  prEN 676 provides comprehensive terms related to combustible gases, burner operation, gas line components, and control and safety devices, facilitating a unified language across the industry.

• Construction and Operational Requirements
  The standard specifies mechanical and functional construction requirements to guarantee safe, reliable performance, including:

  • Conversion provisions for different gaseous fuels
  • Equipment design for safety and durability
  • Control and safety devices integration

• Safety and Protective Measures
  Addressing machine-related hazards, prEN 676 outlines protective measures to reduce risk during all phases of burner operation. Annex J details hazardous scenarios and associated safety actions.

• Testing and Verification Procedures
  A series of functional, operational, combustion, and electrical safety tests are defined to validate compliance, including start-up tests and emission measurements. Annexes provide guidance on emissions calculation, test gases, and verification protocols.

• Marking, Labelling, and Documentation
  Manufacturers must follow clear guidelines for product marking, packaging, and offering comprehensive instructions for installation, adjustment, and maintenance to ensure proper and safe use.

Applications

This standard applies broadly across multiple applications where automatic forced draught burners are utilized:

• Residential and Commercial Heating Appliances
  Burners in boilers and heating systems that require precise control and safety measures for gaseous fuel combustion.

• Industrial Heating Systems
  Single gas burners operating within industrial environments, except those specifically tailored for industrial processes, which are excluded.

• Dual Fuel Burners in Gas Mode
  Burners capable of operating on gas and liquid fuels must comply with prEN 676 for the gas function, with EN 267 covering liquid fuel requirements.

• Burners Using Alternative Gaseous Fuels
  The standard also covers burners designed to operate with biogenous gases and gas mixtures conveyed through pipelines, ensuring adaptability to emerging fuel sources.

Related Standards

• EN 267
  Governs construction and operation of liquid fuel burners. Dual fuel burners working on liquid fuels fall under this standard.

• Pressure Equipment Directive (PED) 97/23/EC
  Relevant for burners with pressurized parts or firing pressurized bodies, with additional requirements specified in Annex K of prEN 676.

• EN 60204-1
  Electrical safety and machine control related requirements are referenced and modified within prEN 676, particularly in Annex L.

• Additional CEN Standards for Gas Components
  Including standards for gas valves, regulators, and safety devices that complement burner safety and efficiency.

---

The prEN 676 standard plays a critical role in harmonizing safety and operational performance for automatic forced draught gas burners across Europe, promoting the use of efficient, environment-friendly burners while ensuring user and operator safety. Manufacturers, installers, and testing bodies benefit from its thorough technical guidance and structured compliance framework.

Standards Content (Sample)

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

EUROPEAN STANDARD
DRAFT
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.

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
x
A.3 Correction for the influence of combustion air temperature and humidity on NO
x
emissions . 71
A.4 NO mean value for evaluating the NO classes . 72
x x
A.5 CO content . 72
3 3
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
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

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.
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.

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
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, Safety of machinery — Interlocking devices associated with guards — Principles for design
and selection
EN 1092-1, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 1: Steel flanges
EN 1092-2, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 2: Cast iron flanges
EN 1092-3, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 3: Copper alloy flanges
EN 1643, Valve proving systems for automatic shut-off valves for gas burners and gas appliances
EN 1854, Pressure sensing devices for gas burners and gas burning appliances
EN 10204, Metallic products — Types of inspection documents
EN 10208-1, Steel pipes for pipelines for combustible fluids — Technical delivery conditions — Part 1: Pipes
of requirement class A
EN 10208-2, Steel pipes for pipelines for combustible fluids — Technical delivery conditions — Part 2: Pipes
of requirement class B
EN 10216-1, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-alloy
steel tubes with specified room temperature properties
EN 10217-1, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 1: Non-alloy
steel tubes with specified room temperature properties
EN 12067-1, Gas/air ratio controls for gas burners and gas burning appliances — Part 1: Pneumatic types
EN 12067-2, Gas/air ratio controls for gas burners and gas burning appliances — Part 2: Electronic types
EN 15036-1:2006, Heating boilers — Test regulations for airborne noise emissions from heat generators —
Part 1: Airborne noise emissions from heat generators
EN 50156-1:2004, Electrical equipment for furnaces and ancillary equipment — Part 1: Requirements for
application design and installation
EN 60204-1: 2009 Safety of machinery - Electrical equipment of machines - Part 1: General requirements
(IEC 60204-1:2005, A1:2008, modified)
EN 60335-2-102:2007, Household and similar electrical appliances — Safety — Part 2-102: Particular
requirements for gas, oil and solid-fuel burning appliances having electrical connections
(IEC 60335-2-102:2004, modified)
EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)
EN 60730-1, Automatic electrical controls for household and similar use — Part 1: General requirements
(IEC 60730-1:1999, modified + A1:2003, modified)
EN 61310-1, Safety of machinery — Indication, marking and actuating — Part 1: Requirements for visual,
auditory and tactile signals (IEC 61310-1:1995 + Corrigendum 1995)
EN 62061 Safety of machinery - Functional safety of safety-related electrical, electronic and programmable
electronic control systems (IEC 62061:2005)
EN 10220, Seamless and welded steel tubes — Dimensions and masses per unit length
EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions,
tolerances and designation (ISO 228-1:2000)
EN ISO 3166-1, Codes for the representation of names of countries and their subdivisions — Part 1: Country
codes (ISO 3166-1:2006)
EN ISO 4871, Acoustics — Declaration and verification of noise emission values of machinery and equipment
(ISO 4871:1996)
EN ISO 9606-2, Qualification test of welders — Fusion welding — Part 2: Aluminium and aluminium alloys
(ISO 9606- 2:2004)
EN ISO 9606-3, Approval testing of welders — Fusion welding — Part 3: Copper and copper alloys
(ISO 9606-3:1999)
EN ISO 9606-4, Approval testing of welders — Fusion welding — Part 4: Nickel and nickel alloys
(ISO 9606-4:1999)
EN ISO 9606-5, Approval testing of welders — Fusion welding — Part 5: Titanium and titanium alloys,
zirconium and zirconium alloys (ISO 9606-5:2000)
EN ISO 12100:2010, Safety of machinery - General principles for design – Risk assessment and risk reduction
(ISO 12100:2010)
EN ISO 13849-1, Safety of machinery — Safety-related parts of control systems — Part 1: General principles
for design (ISO 13849-1:2006)
EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 1: Arc welding (ISO 15609-1:2004)
EN ISO 15609-2, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 2: Gas welding (ISO 15609-2:2001)
EN ISO 15609-3, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 3: Electron beam welding (ISO 15609-3:2004)
EN ISO 15609-4, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 4: Laser beam welding (ISO 15609-4:2004)
EN ISO 15609-5, Specification and qualification of welding procedures for metallic materials — Welding
procedure specification — Part 5: Resistance welding (ISO 15609-5:2004)
EN ISO 15612, Specification and qualification of welding procedures for metallic materials — Qualification by
adoption of a standard welding procedure (ISO 15612:2004)
EN ISO 15614-7, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 7: Overlay welding (ISO 15614-7:2007)
EN ISO 15614-11, Specification and qualification of welding procedures for metallic materials — Welding
procedure test — Part 11: Electron and laser beam welding (ISO 15614-11:2002)
ISO 7-1, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances
and designation
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 12100:2010 and the following
apply.
3.1 General terms and definitions
3.1.1
forced draught burner
burner in which the total air for combustion is supplied by means of a fan
3.1.2
automatic forced draught burner
burner that is fitted with an automatic ignition, flame monitoring and burner control devices where the ignition,
flame monitoring and the on/off switching of the burner occurs automatically
NOTE The heat input of the burner can be adjusted during operation either automatically or manually.
3.1.3
dual-fuel burner
burner in which both gaseous and liquid fuels can be burnt either simultaneously or in succession
3.1.4
total pre-mixed burner
burner in which part, or all, of the air for complete combustion of the gas is mixed with the gas upstream of the
mixture outlet ports
3.1.5
nozzle mixed burner
burner in which part, or all, of the air required for combustion of the gas is mixed with the gas at, or
downstream of, the air and gas ports
3.1.6
integrated ignition burner
burner with direct main ignition burner at reduced rate with by-pass start gas supply
3.1.7
start gas rate
gas rate ignited by the ignition device during the start-up of the burner
3.1.8
industrial application
forced draught burner utilization and operation in industrial environment
EXAMPLE industrial application in:
 the extraction,
 growth,
 refining,
 processing,
 production,
 manufacture or
 preparation
of materials, plants, livestock, animal products, food or artefacts.
3.1.9
combustion chamber
part of the appliance in which the combustion takes place
3.1.10
burner head
device for mixing fuel and air comprising, for example, a stabilizing disc and nozzle, that keeps the flame in its
safe position during operation of the burner
3.1.11
heat transfer medium
gaseous or liquid substance for the transport of heat energy from the appliance.
3.1.12
appliance
heat generator, into which the burner fires, which has a combustion chamber and heat exchanger to indirectly
transmit the heat input from the burners combustion gases to the heat transfer medium
3.2 Combustible gases
3.2.1
reference condition
ambient condition of 15 °C and 0,101 325 MPa
3.2.2
calorific value
quantity of heat produced by the combustion, at a constant pressure equal to 0,101 325 MPa, of unit volume
or mass of gas, the constituents of the combustible mixture being taken at reference conditions and the
products of combustion being brought back to the same conditions
NOTE A distinction is made between:
 the gross calorific value: in which the water produced by combustion is assumed to be condensed;
Symbol: H
s
and
 the net calorific value: in which the water produced by combustion is assumed to be in the vapour state.
Symbol: H
i
Units: either
 megajoules per cubic metre (MJ/m³) of dry gas at the reference conditions, or
 megajoules per kilogram (MJ/kg) of dry gas
3.2.3
relative density
d
ratio of the masses of equal volumes of dry gas and dry air at the same conditions of temperature and
pressure
3.2.4
Wobbe index
ratio of the calorific value of a gas per unit volume and the square root of its relative density under the same
reference conditions
NOTE 1 The Wobbe index is said to be superior (Ws) or inferior (Wi) depending on whether the calorific value used is
superior or inferior.
NOTE 2 The units used for the Wobbe Index are either:
a) megajoules per cubic metre (MJ/m³) of dry gas at the reference conditions; or
b) megajoules per kilogram (MJ/kg) of dry gas.
NOTE 3 Adapted from ISO 14532:2005.
3.2.5
gas pressure
static pressure of the moving gas, relative to the atmospheric pressure, measured at right angles to the
direction of flow of the gas
NOTE Gas pressure is expressed in Pascal (Pa, kPa, MPa).
3.2.6
line-conveyed gas
gaseous fuels available by line conveyed supply on site on which burners operate under nominal conditions
when they are supplied at the corresponding normal pressure
3.2.7
reference gases
test gases on which burners operate under nominal conditions when they are supplied at the corresponding
normal pressure
3.2.8
limit gases
test gases representative of the extreme variations in the characteristics of the gases for which burners have
been designed
NOTE The characteristics of the reference and limit gases are given in Table C.1.
3.2.9
normal pressure
pressure under which the burners operate in nominal conditions when they are supplied with the
corresponding reference gas
3.2.10
limit pressures
pressures representative of the extreme variations in the burner supply conditions
NOTE The test pressures are given in Table 5.
3.2.11
supply pressure
pressure measured immediately upstream of all gas line components but downstream of the manually
operated shut-off valve
NOTE See measuring point M1 as specified in Figure 1, at which the nominal conditions are achieved.
3.2.12
adjustment pressure
pressure measured immediately downstream of the pressure regulator
NOTE See measuring point M2 as specified in Figure 1, at which the nominal conditions are achieved.
3.2.13
burner head pressure
pressure measured immediately before the burner head
NOTE See measuring point M3 as specified in Figure 1, at which the nominal conditions are achieved.
3.2.14
pressure in the combustion chamber
pressure or depression, relative to atmospheric pressure, prevailing in the combustion chamber
3.3 Test rig and combustion chamber
3.3.1
combustion chamber pressure
p
F
effective positive pressure or negative pressure relative to the atmospheric pressure prevailing in the
combustion chamber
NOTE Combustion chamber pressure is measured in kPa.
3.3.2
length of the combustion chamber
l
distance between the face of the nozzle or the fuel outlet and the rear wall of the test flame tube or
combustion chamber or any lateral contraction
NOTE The length of the combustion chamber is measured in m.
3.3.3
diameter of the combustion chamber
d
inner diameter of the combustion chamber around the flame tube of the burner
NOTE The diameter of the combustion chamber is measured in m.
3.3.4
burner flame tube
device which hosts the mixing device and the root of the flame
3.3.5
test flame tube
cylindrical part of the test rig where the combustion take place
3.4 Composition of the gaseous combustion products
3.4.1
content of carbon dioxide (CO2)
ratio of the volume of carbon dioxide to the total volume of dry gaseous products in which it is present
NOTE The carbon dioxide content is expressed as a percentage volume fraction.
3.4.2
content of oxygen (O2)
ratio of the volume of oxygen to the total volume of dry gaseous products in which it is present
NOTE The oxygen content is expressed as a percentage volume fraction.
3.4.3
content of carbon monoxide (CO)
ratio of the volume of carbon monoxide to the total volume of dry gaseous products in which it is present
NOTE The carbon monoxide content is expressed as a volume fraction, in units of millilitres per cubic metre for
measuring purpose and in milligrams per kilowatt hours [mg/kWh] related to inferior calorific value (Hi) for calculation
purposes and declaring values.
3.4.4
content of nitrogen oxides (NOx)
ratio of the combined volume of nitrogen oxides to the total volume of dry gaseous products in which they are
present
NOTE The nitrogen oxides content is expressed as a volume fraction, in units of millilitres per cubic metre for
measuring purpose and in milligrams per kilowatt hours [mg/kWh] related to inferior calorific value (Hi) for calculation
purposes and declaring values.
3.4.5
excess air ratio
λλλλ
ratio between the effectively introduced quantity of air and the theoretically required quantity of air
3.5 Burner operation
3.5.1 Gas rate
3.5.1.1
volume flow rate
q
V
volume of gas consumed by the burner in unit time during continuous operation
NOTE The units used for volume flow rate are either
a) cubic metres per hour (m /h),
b) litres per minute (l/min),
c) cubic decimetres per hour (dm /h), or
d) cubic decimetres per second (dm /s).
3.5.1.2
nominal volume flow rate
volume flow rate stated by the manufacturer
NOTE Nominal volume flow rate is expressed in cubic metres per hour (m /h)
3.5.1.3
maximum flow rate
highest flow rate stated by the manufacturer
NOTE Maximum mass flow rate is expressed in cubic metres per hour (m /h) at reference conditions
3.5.1.4
minimum flow rate
lowest flow rate stated by the manufacturer
NOTE Minimum mass fl
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