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BS EN 746-3:2021 – TC:2022 Edition

BS EN 746-3:2021 – TC:2022 Edition

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Tracked Changes. Industrial thermoprocessing equipment – Safety requirements for the generation and use of atmosphere gases

Published By Publication Date Number of Pages
BSI 2022 188
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This part of the EN 746 series specifies safety requirements for generation and use of protective and reactive atmosphere gases that are part of industrial thermo-processing equipment (TPE). The general safety requirements common to TPE are provided in EN 746 1:1997+A1:2009 (see Introduction). This part of the EN 746 series deals with significant hazards, hazardous situations and events relevant to the generation and use of protective and reactive atmosphere gases created by thermochemical reactions and their use in TPE that are part of TPE as listed in Clause 4 and Clause 5, when used as intended and under the conditions foreseen by the manufacturer. This part of the EN 746 series covers: – pipework downstream of and including the manual isolating valve, – equipment for the generation of atmosphere gases, – additional equipment for the use of atmosphere gases in TPE, – safety devices, and – functional requirements for safety related control system for the generation and use of protective and reactive atmosphere gases. It applies to the supply of atmosphere gas, source gas, inert gas and process liquids to TPE and their removal from TPE, confined to equipment integrated in the TPE. This part of the EN 746 series also details the anticipated significant hazards associated with atmosphere gas systems and their use in TPE and specifies the appropriate preventative measures for the reduction or elimination of these hazards. The pressure hazard of the piping and components covered by this standard is within the maximum pressure/size relationship of group 1 as described in Annex C. This part of the EN 746 series: – specifies the requirements to be met to ensure the safety of persons and property during installation, commissioning, start up, operation, shutdown and maintenance, – does not cover the relevant risks involved in the flue gas ducting system when it is not considered a part of TPE, – is not applicable to utility supply upstream of the TPE main disconnects, – does not apply to TPE for semi-conductor devices, – does not apply to TPE with atmosphere, such as air and flue gas from an over stoichiometric combustion, – does not cover the decommissioning of the TPE, – does not cover vacuum furnaces, – does not cover blast furnaces, converters (in steel plants), boilers and equipment not covered under EN ISO 12100:2010. – does not deal with the hazard of noise which is covered in EN 746 1:1997+A1:2009, – is not applicable to generation and use of atmosphere gas in TPE and associated plant which is manufactured before the date of its publication, and – gives the necessary requirements for the information for use. A TPE designed according to this part of EN 746 series does not create any potentially explosive atmosphere in the area around the TPE and is not designed to be located in an area with a potentially explosive or hazardous atmosphere. This part of the EN 746 series deals with significant hazards which are described in Annex A. A table of typical protective and reactive gases is given in Annex B.

PDF Catalog

PDF Pages PDF Title
1 30451181
113 A-30399626
114 undefined
121 1 Scope
122 2 Normative references
124 3 Terms and definitions
127 4 Safety requirements and/or protective/risk reduction measures
4.1 General
4.2 Pipework
4.2.1 General
128 4.2.2 Connections
129 4.2.3 Unconnected pipework
4.2.4 Galvanic cells
4.2.5 Flexible tubing and couplings
4.2.6 Marking of pipework
4.2.7 Soundness/Tightness
130 4.2.8 Condensate drains
4.2.9 Purge points
4.2.10 Blow-off and breather pipes or conduits
4.2.11 Pressure relief devices and flame arrestors on pipework
4.2.12 Pressure oscillations
131 4.2.13 Combustible gas by-pass
4.2.14 Isolation of required safety devices
4.2.15 Vents
4.3 Required safety devices
4.3.1 Atmosphere gas control equipment
4.3.1.1 General
132 4.3.1.2 Safety devices for introduction of atmosphere gases to TPE
135 4.3.1.3 Safety devices for purge gas
4.3.2 Other safety devices
4.3.2.1 Trap seals
4.3.2.2 Safety devices for gas boosters/compressors
4.3.2.3 Devices for vacuum conditions
136 4.4 Requirements for the use of atmosphere gases
4.4.1 Prevention of potential ignitable atmospheres
4.4.1.1 General
4.4.1.2 Safety temperature
4.4.1.3 Monitoring of TPE pressure
4.4.1.4 Controlling process air/oxygen of TPE operating below 750 Ā°C
137 4.4.1.5 Monitoring of atmosphere gas and process liquid supply
4.4.2 Monitoring of TPE doors movements
4.4.3 Supervision of the means of ignition at the point of combustible atmosphere gas discharge
4.4.4 Emergency safety purge
138 4.5 Change of atmosphere
4.5.1 General
4.5.2 Purge with purge gas
4.5.2.1 General
4.5.2.2 Purge with purge gas to change atmosphere from air to combustible gas
139 4.5.2.3 Purge with purge gas to change atmosphere from combustible gas to air
4.5.3 Purge with self-ignition
4.5.3.1 General
4.5.3.2 Purge with self-ignition to change atmosphere from air to combustible gas
4.5.3.3 Purge with self-ignition to change atmosphere from combustible gas to air
4.5.4 Change of atmosphere by burning
4.5.4.1 General
4.5.4.2 Change of atmosphere by burning from air to combustible gas
140 4.5.4.3 Change of atmosphere by burning from combustible gas to air
4.5.5 Purge by evacuation
4.5.5.1 General
4.5.5.2 Purge by evacuation to change atmosphere from air to combustible gas
4.5.5.3 Purge by evacuation to change atmosphere from combustible gas to air
4.6 Interfaces to exhaust systems for combustible or toxic atmosphere gases
4.6.1 Exhaust of burned gases
4.6.1.1 General
4.6.1.2 Natural draft exhaust gas system
141 4.6.1.3 Vented exhaust gas system
4.6.2 Gathering of gases without burning and a closed system
5 Additional requirements for the generation of atmosphere gases
5.1 General
142 5.2 Gas and process liquid supplies
5.2.1 Air supplies
5.2.2 Reaction mixture supplies
5.2.3 Generated atmosphere gas distribution
5.2.3.1 Valves
5.2.3.2 Condensate traps
5.2.3.3 Excess of generated atmosphere gas
5.3 Flame detection
143 5.4 Burners generating exothermic gases
5.5 Special requirements for different types of generator
5.5.1 Requirements for endothermic generators
5.5.1.1 Source gas supplies
5.5.1.2 Catalyst regeneration
5.5.1.3 Mixture supplies
5.5.1.4 Temperature monitoring
5.5.2 Requirements for exothermic generators
5.5.2.1 Mixture supplies
144 5.5.2.2 Pre-purge before start-up
5.6 Post-treatment of generated atmosphere gases
6 Verification of the safety requirements and/or measures
148 7 Information for use
7.1 General
7.2 Marking
149 7.3 Instruction handbook
7.3.1 General
7.3.2 Description of equipment
7.3.3 Inspection procedures
150 7.3.4 Commissioning, start-up and operating procedures
7.3.4.1 General
7.3.4.2 Conditions for start-up
7.3.4.3 Operation condition
151 7.3.5 Shutdown procedures
7.3.6 Maintenance procedures
152 7.3.7 Documentation
153 Annex A (informative)List of significant hazards
155 Annex B (informative)Typical protective and reactive atmosphere gases
157 Annex C (normative)Allowed maximum pressure
162 Annex D (informative)Principle procedures for the change of atmosphere
163 Annex E (informative)Examples for the determination of safety integrity level SIL and performance level PL using the risk graph method
175 Annex F (informative)Basic configuration of piping system of TPE using protective or reactive atmosphere gases
177 Annex G (informative)Overview of the terms defined in ISO 13574 (Vocabulary)
184 Annex ZA (informative)Relationship between this European Standard and the essential requirements of Directive 2006/42/EC aimed to be covered

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