Fans for ATEX EXPLOSIVE ATMOSPHERES

Transcription

1 Fans for ATEX EXPLOSIVE ATMOSPHERES An ATEX area is a mixture of air and inflammable gas, the vapour of an inflammable liquid, a fog of combustible liquid or combustible powder, which, if they catch fire, do so at once in their entirety. Sensitivity to the ignition of gases: LIE Minimum concentration of explosivity» % volume. LSE Maximum concentration of explosivity» % volume. EMI Minimum ignition energy» 10-6 μ Joules Flash Point Minimum temperature of a liquid forms inflammable gases Temperature Temperature at which a gas ignites temperature T1, T2, T3, T4, T5 and T6 Sensitivity to the ignition of solids: LIE or CME Minimum concentration explosive» g/m 3 CLO Maximum concentration of Oxygen» % volume EMI Minimum ignition energy» 10-3 μ Joules TMI Minimum ignition temperature in ºC: - In a TMI n cloud (a cloud of dust in contact with a hot surface). - In a TMI c layer, ignition of a 5 mm layer. - (limit of T the lesser of: 2/3 of TMI n or TMI c -75ºC) Summary of definitions of the zones Explosive atmospheres II 3 G. EEx na II 3 D. IP55 (non-conductive dust) II 2 D. IP65 (conductive dust) Zone 2 (gas) Zone 22 (dust) Not probable under normal operating conditions Zone 1 (gas) Zone 21 (dust) Probable under normal operating conditions II 2 G. EEx d II 2 G. EEx de II 2 G. EEx p II 2 G. EEx e II 2 D. IP65 Zone 0 (gas) Zone 20 (dust) Electric motors cannot be used Definition of zones: Gases and vapours / Powders: Zone 0 / Zone 20: Present continuously, during long periods of time or frequently. It is not possible to use electric motors. Zone 1 / Zone 21: It is probable in normal operating conditions Zone 2 / Zone 22: The creation of an ATEX zone is not probable under normal operating conditions Groups and categories of apparatus: GROUP I: Equipment for underground and surface work in mines with danger of firedamp or explosive powders. M1 Category: must remain operative M2 Category: it must be possible to cut off the energy supply GROUP II: Other danger zones Category 1: a very high level of protection. Highly probable area. Category 2: a high level of protection. Probable area. Category 3: a normal level of protection. Improbable area. 10

2 Selection of the category according to the zone: ZONE CATEGORY 0 or or 21 1 or 2 2 or 22 1, 2 or 3* *The 3D category cannot be used with a conductive powder Selection of the zone according to the category: CATEGORY ZONE 1 All 2 1, 21, 2 or 22 3* 2 or 22 *The 3D category cannot be used with a conductive powder Explosion group and kind of temperature Explosion group II A Kind of temperature T1 T2 T3 T4 T5 T6 Acetone Ethane Ethylic acetate Ethyl chloride Ammoniac Benzene Acetic acid Carbon monoxide Methane Methanol Methyl chloride Propane Town gas Toluene Amyl-i acetate Butane N-butyl alcohol Cyclohexane Dichloroethane 1, 2 Acetic anhydride Petrol Otto fuels Aviation fuel Fuel oils Hexane Acetaldehyde II B Ethylic alcohol Ethylene Ethylene monoxide Sulfureted hydrogen Ethylic ether II C Hydrogen Acetylene Carbon disulphide Kind of temperature and ignition temperature: Kind of temperature Ignition temperature T1 <450 T2 300 to 450 T3 200 to 450 T4 135 to 200 T5 100 to 135 T6 85 to 100 Explosivity values for combustible solids Product Kmax Pmax EMI CLO TMIn TIMc Cornflour Ground rice > Wheat flour >300 11% Malted flour >10 11% Corn starch >100 9% Rice starch > Potato starch > Mark (EN) in accordance with ATEX FAN and MOTOR marks in accordance with the ATEX directive 0081 II 2 G/D EC mark Identification of certifying authority (e.g. LCIE) EC mark for Ex products Electrical apparatus groups Category of the equipment (2 or 3) Gas or Dust Extra standard mark for motors EEx d II C T4 Explosionproof apparatus Groups according to Gas (Only required for flame-resistant) Group (all except mines) Protection type Kind of temperature 11

3 : Axial fans with square frame, with ATEX certification EEx d : Axial fans with circular frame, with ATEX certification EEx d Wall-mounted axial fans () or circular axial fans () with ATEX certification and CEE ExII2G EExd flame-resistant motor to work in explosive atmospheres. Fan: Impeller made from cast aluminium Airflow direction from motor to impeller Spark-proof stuffing-box included : Support frame in aluminium sheet : Protection guard against contacts, in accordance with standard UNE : Support ring in sheet steel with aluminium strip in the impeller area in accordance with Standard EN-14986:2006 Motor: Class F motors with ball bearings, IP-55 protection, with ATEX certification, EEx d IIBT4 flame-resistant Three-phase 230/400V.-50Hz. (up to 5.5CV.) and 400/690V.-50Hz. (power over 5.5CV.) Working temperature: -20ºC.+ 40ºC. Mark: II 2 G. EEx d Notified authority: L.O.M. ID: LOM3ATEX0157 Finish: Rust retardant with ATEX paint, free of ferric components, in polyester resin, polymerised at 190ºC, with prior alkaline degreasing and with phosphate-free pre-treatment On request: Special windings for different voltages and frequencies ATEX construction for different categories Fans with two-speed motor. Aluminium strip to prevent sparks in accordance with standard EN-14986:2006 Order code 45 4T : Axial fans with square frame, with ATEX certification : Axial fans with circular frame, with ATEX certification Mark: II 2 G. EEx d IIBT4 Notified authority: L.O.M. ID: LOM3ATEX0157 Impeller diameter (cm) Number of motor poles 4=1400 r/min. 50 Hz 6=900 r/min. 50 Hz T=Three-phase M=Single-phase Technical characteristics Model Speed (r/min) Maximum admissible current (A) 230V 400V Installed power (kw) Maximum airflow (m 3 /h) Sound pressure level db(a) Approx. weight (Kg) -25-4T M T M T M T M T M T T T T T T T T T T T T T

4 Acoustic features The specified values are determined according to free field measurements of pressure and sound levels in db(a) at an equivalent distance of twice the fan s span plus the impeller s diameter, with a minimum of 1.5 m. Sound power Lw(A) spectrum in db(a) via frequency band in Hz. Model Model Dimensions in mm Model A B C D E G H I J -25-4T M T M T M T M T M T T M T M Model A B C D E F J N -63-4T x30º -63-6T x30º -71-4T x22º T x22º T x22º T x22º T x22º T x22º30 15

5 Characteristic curves Q = Airflow in m 3 /h, m 3 /s and cfm. Pe= Static pressure in mm.w.c., Pa and inwg. Accessories See accessories section. INT AR RFT/ RFM PANELS P R RI S 16