CEN/TC 271/WG 4 - Dryers, ovens and evaporating equipment

This European Standard deals with all significant hazards, hazardous situations and hazardous events relevant to ovens and dryers in which flammable substances are released by evaporation from and curing of coating materials.
The specific significant risks related to the use of this machinery with foodstuff and pharmaceutical products are not dealt with in this European Standard.
This European Standard is only applicable to machines which are used as intended and under the conditions which are foreseeable as malfunction by the manufacturer (see Clause 4).
For ovens and dryers in which flammable substances are released by evaporation from and curing of coating materials, in which the concentration of these flammable substances shall not, under no circumstances, exceed 3 % of the LEL, EN 746-1 and EN 746-2 may be applied instead of this European Standard.
This European Standard is not applicable to:
—   ovens for hardening metals;
—   enamelling plants;
—   portable heating systems for drying (for instance infrared radiant heaters, hot-air blowers, blow-dryers);
—   solvent recovery plants;
—   distillation and/or refraction plants;
—   textile dry-cleaning systems.
This European Standard is not applicable to machinery manufactured before the date of its publication as EN.

This European Standard is applicable to thermal cleaning systems for exhaust gas from surface treatment equipment/systems as given below in which the concentration of exhaust gas to be cleaned (for the purpose of this European Standard, named "process gas") at the inlet to the thermal cleaning system is safely limited within the concentration ranges given in 5.2.2.2.
Surface treatment equipment includes:
-   dryers according to EN 1539, curing equipment;
-   flash-off areas;
-   coating plants (e.g. closed spray booths, open fronted spray booths);
-   machines using flammable solvents for the pre-treatment and cleaning of products or equipment (e.g. barrels, tins, cans or containers);
-   related solvent handling equipment.
This European Standard deals only with the significant hazards from fire and explosion and hazards generated by residual process gases as listed in Clause 4, when used as intended and under the conditions foreseen by the manufacturer.
The types of thermal cleaning systems covered in this European Standard are
-   direct combustion, and
-   catalytic combustion
(see definitions in 3.1.1 and 3.1.2).
This European Standard applies in conjunction with the relevant requirements of EN 746-1 and EN 746-2.
For the purpose of this European Standard a thermal cleaning system for process gas contains the following components: fan(s), heat exchanger, process space, main and supporting burner, injection system, power driven dampers, control and power circuits joined together for the processing of flammable substances, predominantly volatile organic compounds, by effecting oxidation.
NOTE    Thermal cleaning equipment is usually integrated with systems as covered by e.g. EN 1010-1, EN 1539, EN 12215, EN 12921-1 or EN 12921-3.
1.2   This European Standard is not applicable to:
-   thermal paint removal systems;
-   pyrolytic systems.

This European Standard deals with all significant hazards, hazardous situations and hazardous events relevant to ovens and dryers in which flammable substances are released by evaporation from and curing of coating materials.
This European Standard is only applicable to machines which are used as intended and under the conditions which are foreseeable as malfunction by the manufacturer (see Clause 4).
This European Standard is not applicable to:
-   ovens and dryers in which flammable substances are released by evaporation from and curing of coating materials, in which the concentration of these flammable substances shall not, under no circumstances, exceed 3 % of the LEL,
NOTE 1   These machines are dealt with in EN746-1 and EN746-2.
-   combined spraying and drying booths,
NOTE 2   EN13355  deals with combined spraying and drying booths
-   ovens for hardening metals,
-   sintering furnaces,
-   enamelling plants,
-   portable heating systems for drying (for instance infrared radiant heaters, hot-air blowers, blow-dryers),
-   machinery for production of pharmaceutical products,
-   machinery for production of food,
-   solvent recovery plants,
-   distillation and/or refraction plants,
-   textile dry-cleaning systems.
This European Standard is not applicable to machinery manufactured before the date of its publication as EN.

1.1   This document is applicable to thermal cleaning systems for exhaust gas from surface treatment equipment/systems as given below in which the concentration of exhaust gas to be cleaned (for the purpose of this document, named "process gas") at the inlet to the thermal cleaning system is safely limited within the concentration ranges given in 5.2.1.2.
Surface treatment equipment includes:
-   dryers according to EN 1539, curing equipment;
-   flash-off areas;
-   coating plants (e.g. closed spray booths, open fronted spray booths);
-   machines using flammable solvents for the pre-treatment and cleaning of products or equipment (e.g. barrels, tins, cans or containers);
-   related solvent handling equipment.
This document deals only with the significant hazards from fire and explosion as listed in Clause 4, when used as intended and under the conditions foreseen by the manufacturer.
The types of thermal cleaning systems covered in this document are
-   direct combustion, and
-   catalytic combustion
(see definitions in 3.1.1 and 3.1.2).
This document shall be used in conjunction with the relevant requirements of EN 746-1 and EN 746-2.
For the purpose of this document a thermal cleaning system for process gas contains the following components: fan(s), heat exchanger, process space, main and supporting burner, injection system, power driven dampers, control and power circuits joined together for the processing of flammable substances, predominantly volatile organic compounds, by effecting oxidation.
NOTE    Thermal cleaning equipment is usually integrated with systems as covered by e.g. EN 1010, EN 1539, EN 12215, prEN 12921-1 or prEN 12921-3.
1.2   This document is not applicable to:
-   thermal paint removal systems;
-   pyrolytic systems.
1.3   This document is not applicable to thermal cleaning systems which are manufactured before the date of publication of this document by CEN.

This standard deals with all significant hazards relevant to dryers and overns, in which flammable substances are released, when they are used as intended and under conditions foreseen by the manufacturer (see clause 4). 1.1 This standard is applicable to dryers, ovens and other evaporating equipment used in the pre-treatment, printing, coating and/or impregnating processes of surfaces and/or materials.