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BS EN 676:2020 2023

BS EN 676:2020 2023

$215.11

Forced draught burners for gaseous fuels

Published By Publication Date Number of Pages
BSI 2023 150
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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.

PDF Catalog

PDF Pages PDF Title
2 undefined
14 1 Scope
2 Normative references
17 3 Terms and definitions
3.1 General terms and definitions
19 3.2 Combustible gases
22 3.3 Test rig and combustion chamber
3.4 Composition of the gaseous combustion products
23 3.5 Burner operation
3.5.1 Gas rate
24 3.5.2 Permanent and intermittent burner operation
25 3.6 Gas line components
3.7 Adjusting, control and safety devices
29 3.8 Sequencing times
31 3.9 Combustion
3.10 Diagrams
4 Constructional and operational requirements – safety requirements and/or protective measures
4.1 Conversion to different gases
4.2 Construction
4.2.1 General
32 4.2.2 Design
4.2.2.1 Combustion
4.2.2.2 Mechanical safety, stability and control devices
4.2.3 Accessibility for maintenance and use
4.2.4 Soundness
4.2.5 Materials
33 4.2.6 Mounting
4.2.7 Connections
4.3 Equipment
4.3.1 Motors and fans
34 4.3.2 Electrical safety and EMC related to safety
4.3.3 Adjustable air damper
4.3.4 Gas line components
4.3.4.1 General
4.3.4.2 Manually operated shut-off valve
35 4.3.4.3 Filter/strainer
4.3.4.4 Gas pressure regulator
36 4.3.4.5 High gas pressure over load protection device
4.3.4.6 Low gas pressure protection device
4.3.4.7 Adjustment devices
4.3.4.8 Automatic safety shut-off valves
37 4.3.4.9 Ignition device
4.3.4.10 Flame detector device
38 4.3.4.11 Air proving device
39 4.3.4.12 Air/gas ratio control devices
4.3.4.13 Pressure test points
43 4.3.4.14 Automatic burner control unit
4.3.4.15 Valve proving system
4.3.4.16 Electrical interfacing with appliances
4.4 Functional and operational requirements
4.4.1 General function requirements
4.4.1.1 General
4.4.1.2 Burner start-up
44 4.4.1.3 Pre-purge
45 4.4.1.4 Start heat input
4.4.1.5 Start gas ignition
4.4.1.6 Main burner ignition
49 4.4.1.7 Safety times
51 4.4.1.8 Flame failure during ignition period
4.4.1.9 Flame failure during the running condition
4.4.1.10 Burner shut-down
4.4.2 Operational requirements
4.4.2.1 External soundness
4.4.2.2 Resistance of the burner to over-heating
4.4.2.3 Temperatures of the control and safety devices
4.4.2.4 Ignition, operation and flame stability
52 4.4.2.5 Surface temperatures
4.4.3 Heat input range of the burner
4.4.4 Dual-fuel burner
4.4.5 Working diagram and test diagram
4.4.5.1 Working diagram
4.4.5.2 Test diagram
4.4.6 Determination of the flame stability and safe range of operation
53 4.4.7 Limiting values for combustion emissions
4.4.7.1 Carbon monoxide (QCO)
4.4.7.2 Nitrogen oxide (QNOx)
55 4.4.8 Starting characteristics
4.4.9 Appliance categories
4.4.10 Reset from lock-out
56 4.5 Machine safety requirements and/or protective measures
5 Test methods
5.1 General
5.1.1 Test gases for forced draught burners
57 5.1.2 Test pressures
5.1.3 Test rig
5.1.3.1 General
5.1.3.2 Test rig for a heat input of less than or equal to 2,4 MW
60 5.1.3.3 Test rig for a heat input greater than 2,4 MW
62 5.1.3.4 Heat transfer medium
63 5.1.3.5 Ambient test conditions
5.1.3.6 Evacuation of the combustion products
64 5.1.3.7 Electrical supply
5.1.3.8 Installation
65 5.1.3.9 Accuracy of measurements
5.1.3.10 Environmental aspects concerning tests
66 5.1.4 Types of test
5.1.4.1 General
5.1.4.2 Structural testing
5.2 Functional tests
5.2.1 General
5.2.2 Start-up
5.2.3 Pre-purge
5.2.4 Start-up heat input
5.2.5 Ignition
67 5.2.6 Safety times
5.2.6.1 General
5.2.6.2 First and second safety time
5.2.6.3 Safety time during operation
5.2.6.4 Failure to ignite
5.2.6.5 Total closing time
5.3 Operation
5.3.1 External soundness
68 5.3.2 Resistance of the burner to over-heating
5.3.2.1 Nozzle-mixed burners
5.3.2.2 Pre-mixed burner
5.3.3 Temperature of the control and safety devices
5.3.4 Ignition — flame stability
70 5.3.5 Operation — flame stability
71 5.3.6 Auxiliary electricity consumption (ErP)
5.3.7 Sound power level LWA (ErP)
5.4 Tests to be carried out on the working and test diagrams
5.4.1 Tests at point 1
72 5.4.2 Tests at point Hp1
5.4.3 Tests at points 2, 5 (single, multi-stage and modulating burners) and 6 (multi-stage and modulating burners)
73 5.4.4 Tests at points Hp2 (single, multi-stage and modulating burners) and Hp6 (multi-stage and modulating burners)
5.4.5 Tests at point 3
5.4.6 Tests at point 4
74 5.4.7 Tests at first stage points or minimum heat input
5.4.8 Summary
75 5.5 Combustion
76 5.6 Start-up
5.7 Obtaining the heat input
5.7.1 Determination of heat input at reference conditions
78 5.7.2 Determination of heat input at ambient conditions
5.8 Electrical safety
79 5.9 Verification of safety and /or protective measures
6 Marking, labelling and packaging
6.1 General
6.2 Data plate
80 6.3 Other marking
6.4 Instructions for installation, adjustment, maintenance and operation
82 6.5 Packaging
6.6 Marking on the packaging
83 Annex A (normative)Determination of combustion characteristics — Carbon monoxide and nitrogen oxides, conversion and corrections
A.1 CO content (QCO), calculation from ml/m3 into mg/kWh
84 A.2 NOx content (QNOX), calculation from ml/m3 into mg/kWh
85 A.3 Correction for the influence of combustion air temperature and humidity on NOx emissions QNOx
A.4 NOx mean value for evaluating the NOx classes
86 A.5 CO2 content fCO2
A.6 Other conversion factors for emissions, calculated from ml/m3 into mg/m3 at 3 % O2 reference flue gas conditions
88 Annex B (informative)Examples of control box sequencing
89 Annex C (informative)Test gases
C.1 General
C.2 Conditions for preparation of the test gases
90 C.3 Practical application of the test gases
C.3.1 Choice of test gases
92 C.3.2 Conditions of supply and adjustment of the burner
93 Annex D (informative)Gas connections conditions in common use in the various countries
95 Annex E (informative)Tests
E.1 Supplementary testing
E.2 Drawing review
E.3 Individual test and inspection
96 E.4 Test report
97 Annex F (informative)Use of alternative gas lines and test documentation
F.1 Use of alternative gas lines
F.2 Test documentation
98 Annex G (informative)Void
99 Annex H (informative)Check of the air proving device
100 Annex I (informative)Additional recommendations for specific applications
I.1 General
I.2 Pre-heating of the combustion air
I.3 Continuous working of the air ventilator
I.4 Variable excess of combustion air
I.5 Burner with start gas flame
101 I.6 Air filtering
102 Annex J (normative)Machine Directive (2006/42/CE) related hazards – safety requirements and/or protective measures)
J.1 General
J.2 List of significant hazards
J.3 Safety requirements and /or protective measures
J.3.1 General
105 J.3.2 Additional requirements
J.3.2.1 Mechanical safety, stability and control devices
J.3.2.2 Motors and fans
106 J.3.2.3 Electrical safety
J.4 Verification of machine safety requirements and/or protective measures
J.5 Information for use
J.5.1 General
J.5.2 Instructions for installation, adjustment, maintenance and operation
107 Annex K (normative)Additional requirements for burners with pressurized parts and burners firing pressurized bodies as defined in Pressure Equipment Directive (PED) 2014/68/EU
K.1 General
K.2 Pressurized parts
K.2.1 Design
K.2.2 Materials
108 K.2.3 Permanent joints
K.3 Electrical safety and gas line components
K.3.1 Electrical safety
K.3.2 Gas line components
K.4 Gas pressure regulator
K.5 High gas pressure over load protection device
109 K.6 Automatic safety shut-off valve
K.7 Air proving device
K.8 Automatic burner control system
K.9 Means for draining and venting
110 K.10 General functions requirements
K.11 External safety limiter
111 K.12 Design according to Annex L in conjunction with EN 602041
K.12.1 General
K.12.2 Pressure control
K.12.3 Burner control and flame detection
112 K.12.4 Safe shut off of the gas supply
K.12.5 Air/fuel ratio control
K.12.6 Integration of the superior safety equipment of the boiler and of the firing system.
K.13 Consideration: safety life cycle
113 K.14 Tests of pressurized parts
K.14.1 Component pressure strength test
114 K.14.2 Component design mechanical deformation test
K.14.3 Component design welded joint test
K.14.4 External soundness
K.15 Other marking
K.16 Instructions for installation, adjustment, maintenance and operation
116 Annex L (normative)Electrical requirements – modifications to EN 60204-1:2006
L.1 Scope
L.2 Normative references
L.3 Terms and definitions
L.3.1 Protective system
117 L.3.2 Safety device
L.3.3 Sensor
L.3.4 Protective equipment
L.3.5 Actuating element
L.3.6 Control system
L.4 General requirements
L.4.1 General
118 L.4.2 Selection of equipment
L.4.3 Electrical supply
L.4.4 Physical environment and operating condition
L.4.4.1 General
L.4.4.2 Electromagnetic compatibility (EMC)
119 L.4.4.3 Ambient air temperature
L.4.4.4 Humidity
L.4.4.5 Altitude
L.4.4.6 Contaminants
L.4.4.7 Ionizing and non-ionizing radiation
L.4.4.8 Vibration, shock, and bump
120 L.4.4.9 Equipment used in flammable atmospheres
L.5 Incoming supply conductor terminations and devices for disconnecting and switching off
L.5.1 Devices for disconnecting electrical equipment
L.6 Protection against electric shock
L.6.1 General
L.6.2 Protection against direct contact
L.7 Protection of equipment
L.8 Equipotential bonding
L.9 Control circuits and control functions
121 L.9.1 Control circuits
L.9.1.1 Control circuit supply
L.9.1.2 Control circuit voltages
L.9.2 Control functions
122 L.9.3 Protective interlocks
L.9.4 Control functions in the event of failure (Protective system)
L.9.4.1 General requirements
L.9.4.2 Measures to minimize risk in the event of failure
123 L.9.4.3 Protection against maloperation due to earth faults, voltage interruptions and loss of circuit continuity
L.9.4.4 Classification of protective systems
124 L.9.4.5 Safety lifecycle for protective systems
L.9.4.6 Determination of the safety level (PL / SIL) for protective functions
129 L.9.4.7 Application software for PLC based protective systems
L.9.4.8 Installation and commissioning
130 L.9.4.9 Safety validation of protective systems
L.9.4.10 Modification and retrofit
L.10 Operator interface and machine-mounted control devices
L.11 Electrical equipment (Controlgear: location, mounting, and enclosures)
L.11.1 Degrees of protection
L.11.2 Access to controlgear
L.11.3 Creepage distances and clearances
L.11.4 Transformers
131 L.11.5 Switching devices
L.11.6 Trace heating systems
L.12 Conductors and cables
L.13 Wiring practices
L.13.1 Conductors of different circuits
L.14 Electric motors and associated equipment
L.15 Accessories and lighting
L.15.1 Accessories
L.15.2 Local lighting of the machine and equipment
L.16 Marking, warning signs and reference designations
L.17 Technical documentation
L.18 Verification
132 Annex M (informative)Burner equipped to increase the efficiency
133 Annex N (informative)Electrical interfaces for burners
138 Annex O (informative)Environmental checklist EN 676
140 Annex P (informative)Guide for the applicability of the different standards on electrical safety
142 Annex Q (informative)Verification procedures for market surveillance purposes (ErP)
Q.1 General
Q.2 Minimization of the influence of the measurement procedure
Q.3 Verification of the declared parameters
143 Annex R (informative)Impact of the variations of the gas quality in EU gas grids to gas burners
145 Annex S (informative)A-Deviations
146 Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive 2009/142/EC (GAD) aimed to be covered
149 Annex ZB (informative)Relationship between this European Standard and the ecodesign requirements of Commission Regulation (EU) No 813/2013 aimed to be covered

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BS EN 676:2020 2023
$215.11