scope:

EN 746-2 specifies the safety requirements for combustion and fuel handling systems that are part of industrial furnaces and associated processing equipment (TPE). NOTE - The general safety requirements common to TPE are provided in EN 746 1. This part of EN 746 deals with significant hazards, hazardous situations and events relevant to combustion and fuel handling systems as listed in Annex A, when used as intended and under the conditions foreseen by the manufacturer. EN 746-2 covers: - fuel pipework downstream of and including the manual isolating valve; - combustion air supply (including oxygen and oxygen enriched combustion air) and flue gas system; - burner(s), burner system and ignition device; - functional requirements for safety related control system. EN 746-2 applies to any oxidation with air or other gases containing free oxygen of gaseous and liquid fuels or any combustion of them to release thermal energy in TPE. For thermal or catalytic post combustion and waste incineration, EN 746-2 applies only to auxiliary burners designed to start-up and/or support the process. The pressure hazard of the piping and components covered by EN 746-2 is within the maximum pressure/size relationship of category I as described in normative Annex E. EN 746-2 also gives the necessary requirements regarding information for use. EN 746-2 does not cover hazards from heating generated by electricity. EN 746-2 does not deal with the hazards created by the release of flammable substances from the products processed in the TPE. EN 746-2 is not applicable to combustion and fuel handling systems:
- of welding machines;
- up-stream of the TPE manual isolating valve. EN 746-2 is not applicable to electrical cabling and power cabling upstream of the TPE control panel/protective system. This document is not applicable to fired heaters (including reformer furnaces or cracking furnaces) in the petrochemical and chemical industries or equipment not covered under EN°ISO°12100. This document or parts of this document can be used to fired heaters (including reformer furnaces or cracking furnaces) in the petrochemical and chemical industries or equipment not covered under EN°ISO°12100.