EN 12753:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Thermal cleaning systems for exhaust gas from surface treatment equipment - Safety requirementsSystemes d'épuration thermique de l'air extrait des installations de traitement de surface - Prescriptions de sécuritéThermische Reinigungssysteme für Abluft aus Anlagen zur Oberflächenbehandlung - SicherheitsanforderungenTa slovenski standard je istoveten z:EN 12753:2005SIST EN 12753:2005en25.220.0113.040.40ICS:SLOVENSKI
STANDARDSIST EN 12753:200501-julij-2005

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12753May 2005ICS 13.040.40; 25.220.01English versionThermal cleaning systems for exhaust gas from surfacetreatment equipment - Safety requirementsSystèmes d'épuration thermique de l'air extrait desinstallations de traitement de surface - Prescriptions desécuritéThermische Reinigungssysteme für Abluft aus Anlagen zurOberflächenbehandlung - SicherheitsanforderungenThis European Standard was approved by CEN on 21 March 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12753:2005: E

Schematic views of thermal cleaning systems.23 Annex B (informative)
Temperature dependency of LEL.27 Annex C (informative)
Operating parameters, conditions for use and measurement methods.31 Annex D (informative)
Guidelines for thermal cleaning systems operating at increased concentrations.32 Annex E (informative)
References to national exposure limit values.34 Annex F (normative)
Classification of material's reaction to the fire — national standards.35 Annex G (informative)
Relation between categories and zones.36 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EC Directive 98/37/EC.37 Bibliography.38

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. 1.3 This European Standard is not applicable to thermal cleaning systems which are manufactured before the date of publication of this document by CEN.

Examples of downstream equipment are:  heat recovery systems,  recirculation systems.
Examples of flammable substances are:  solvent vapours;  fuel gases;  condensates;  deposits;  gases released from condensates and/or deposits.
Examples of ignition sources are:  hot surfaces (e.g. of heating systems, of electrical equipment);  heating systems, burners, combustion products;  sparks created by mechanically induced energy (e.g. by fans wheel, bearing);  electrostatic discharges;  electrical sparks;  hot gases or chemical reactions within the system/equipment itself and/or in upstream and downstream equipment components or duct systems due to back-firing.

Maximum temperature in the heat exchanger Mass content of aromatic hydrocarbons Admissible concentration given in % of LEL Reference temperature a) Independent < 25 % 25 % 20 °C b) Independent > 25 % 20 % 20 °C c) 450 °C Independent 50 % Theat exchanger
NOTE 1 The indicated limit values represent the proven findings of scientific studies (see Bibliography) and experiences in the operation of thermal cleaning systems. These findings show that mixtures corresponding to the values indicated in subclauses a), b) and c) do not result in explosive reactions of the flammable substances but an accelerated combustion takes place at temperatures in the region 600 °C. For further information see Bibliography. NOTE 2 For temperature dependence of the LEL, see Annex B. For information about types of thermal cleaning systems, properties of volatile flammable substances and process design see Annex D. There are ways to operate thermal cleaning systems safely at higher concentrations than those given by a), b) and c). These types of thermal cleaning systems are not covered by this European Standard. This is due to the fact that these conditions for a safe operation depend on the specific design of the thermal cleaning system and cannot be determined in a generally applicable way. The risk assessment and the design of such thermal cleaning systems is covered by EN 1127-1. For further information see Annex D. If the limitation of the inlet concentration as given in Table 1 cannot be ensured, the inlet concentration shall be monitored (e.g. by FID, FTA or IR-gas detectors) and interlocked with at least one of the following measures:  damper for diluting of the process gas (e.g. by fresh air);  damper cutting off the process gas;  damper bypassing the system. NOTE 3 Bypassing may need to apply to additional national environmental regulations. The interlocking shall ensure the operation of the system within the limits given in Table 1.
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