1、 STD-BSI BS EN Li97-ENGL 1998 m Lb24bb9 Ob7807L 3T0 m BRITISH STANDARD Specification for Dedicated liquefied petroleum gas appliances - Multi-purpose boiling burners for outdoor use The European Stanard EN 497 : 1997 has the status of a British Standard ICs 97.040.20 NO COPYING WITHOUT BSI PERMISSIO
2、N EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 497 : 1998 STD-BSI BS EN 497-ENGL 1998 m Lb24bh9 Ob78072 237 m Amd. No. BS EN 497 : 1998 Date Text affected National foreword This British Standard is the English language version of EN 497 : 1997. The UK participation in its preparation was entrusted to
3、Technical Committee GSEn4, Dedicated LPG appliances, which has the responsibility to: - aid enquirers to understand the text, - present in the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed - monitor related internation
4、al and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in th
5、e BSI Standards Catalogue under the section entitled International standards Correspondence Index, or by using the Find facility of the BSI Standards Electronic Catalogue. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document com
6、prises a front cover, an inside front cover, the EN title page, pages 2 to 28, an inside back cover and a back cover. This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15
7、February 1998 Amendments issued since publication O BSI 1998 ISBN O 680 28962 1 * m * ENROPEAN STANDARD NORNE EUROPENNE EUROP- NORM EN 497 September 1997 ICs 97.040.20 Descriptors: Gas appliances, liquefied petroleum gases, burners, exterior, definitions, classifications, equipment specifications, p
8、erformance evaluation, safety, tests, verication, marking, technical notices Engush version Specication for dedicated liquefied petmlewn gas appliances - Multi purpose bom burnem for outdoor use Spcidor pour les appareils fonctionnant exclusivement aux gaz de ptrole liqufis - Bnileurs usages multipl
9、es, avec supports inthgrs, utiliss en plein air Festiegungen nIr Fliissiggasgerate - Fissiggasbetriebene Mehmyeckkochgem zur Verwendung im Freien This European Standaxd was approved by CEN on 21 August 1997. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the
10、 conditions for giving this European Standard the status of a national standard without any alteration. Upto-date lists and bibliographical references concerning such national stan- - with two functions: that is designed to be capable of being used as an open burner after removal of a detachable pla
11、te. 3.9 open burners Hotplate burner where the pans being heated are in direct contact with the fiames. 3.10 sooting Phenomenon appearing during incomplete combustion and characterized by a deposit of carbon on surfaces in contact with the flame or the products of combustion. O BSI 1998 3.11 pressur
12、e couple Set of two separate supply gas pressures applied because of the large difference between the Wobbe indexes within a gas family or a gas group: - the highest pressure appies only with gases of low Wobbe index; - the lowest pressure applies only with gases of high Wobbe index. EN 4371 3.12 sh
13、ut down lid A lid intended to be shut down over the hotplate. 3.13 heat input The product of the volume or mass rate and the calorific value of the gas, brought to the same reference conditions. It is expressed in kilowatts (kW). Symbol Q. For the purposes of this standard only heat inputs calculate
14、d from the gross calorific value are considered (see 3.28). 3.14 nominal heat input of a burner The value of the heat input of this burner, as decked by the manufacturer. Symbol Q,. 3.16 mass rate The mass of gas passed in unit time. It is expressed in kilograms per hour (kgh) or in grams per hour (
15、gh). Symbol M. 3.16 volume rate The volume of gas passed in unit time. It is expressed in cubic metres per hour (m3/h) or in cubic decimetres per hour (dm3/h), the gas being dry and under the reference test conditions. Symbol V 3.17 flame lift Phenomenon characterized by the partial or total movemen
16、t of the base of the flame away from the burner port. 3.18 removable That which can only be removed with a tool. 3.19 relative density The ratio of the mass of a volume of dry gas to an equal volume of dry air under the same temperature and pressure conditions. 3.20 ignition device A device to ignit
17、e one or more burners directly or indirectly, for instance through a flash tube. It may be: - either electric (resistance, spark, etc.); - or thermal (fiame, pilot, etc.). 3.21 flame supervision device A device which, due to the presence of a flame on the sensing element, keeps open the gas flow to
18、the burner and pilot and which cuts off the gas supply to the burner and pilot in the case of extinction of the supervised flame. Page 5 EN 497 : 1997 3.22 Wobbe index The ratio of the calorific value of a gas, by unit of volume, and the square root of the density of the same gas. The Wobbe index is
19、 called gross when the calorific value considered is the gross caorifk value (see 3.28). It is expressed in megajoules per cubic metre (MJh3). Symbol gross Wobbe index W,. 3.23 injector A component part that admits the gas into an aerated burner. There are two types of injectom: - calibrated injecto
20、rs, where the section of the outlet orifice is fured - adjustable injectors, where the section of the outlet orifice is variable. 3.24 control handie A component designed to be operated manually so as to control the movement of a control of the appliance, such as a tap, etc. 3.26 means of sealing An
21、y static or dynamic device designed to ensure soundness, for example: flat-faced joints, O-ring joints, conical joints, diaphragms, grease, pastes, putties . 3.26 primary air ajuster A device allowing the aemtion rate of a burner to be set at a predetermined value according to the supply conditions.
22、 The action of operating this device is termed primary air austment. 3.27 gas rate adjuster A device allowing the gas rate to a burner to be set at a predetermined value according to the supply conditions. The Gustment can be continuous (adpstment screw) or discontinuous (changing the calibrated ori
23、fices). The operation of changing the setting of this device is termed the a4pstment of the gas rate. 3.28 calorific value The quantity of heat produced by complete combustion at a constant pressure equal to 1 013,25 mbar, of unit volume or mass of the gas, the components of the fuel mixture being a
24、t 15 OC, 1 013,25 mbar and the products of combustion being brought to the same conditions. There are two calorific values: - the gross calorific value (symbol Hs): the water produced by combustion is assumed to be condensed - the net calorific value (symbol Hi): the water produced by combustion is
25、assumed to be retained in the vapour state. EN 4371 For the purposes of this standard only the gross calorific value is used. O BSI 1998 Page 6 EN 497 : 1997 The calorific values are expressed in units of energy referred: - either to the unit volume of dry gas measured under normal reference conditi
26、ons: 15 OC, 1 013,25 mbar. It is expressed in megajoules per cubic metre (MJ/m3); - or to the unit mass of dry gas. It is then expressed in megajoules per kilogram (MJkg). 3.29 gas supply pressure The difference between the static pressure measured at the gas inlet connection of the appliance and th
27、e atmospheric pressure. It is expressed in miilibm (mbar). 3.30 light back Phenomenon characterized by the retum of the flame inside the body of the burner. 3.31 tap A device designed to isolate a burner from the gas supply pipework and to adjust its rate during use. 3.32 locking Any means of locung
28、 an uster, such that any attempt to change the austment causes the breaking of the sealing device or seaiing material and makes the interference with the adjuster apparent. The uster is said to be sealed in the usted position. An duster sealed at the factory is considered as non-existent. 3.33 soft
29、solder Solder for which the lowest temperature of the melting range, after application, is less than 450 “C. 3.34 stability of flames Condition of flames when the phenomena of flame iift or light back do not occur. 3.36 pan support A component placed above an open burner designed to support the vess
30、el being heated while maintajning it at a set distance from the burner. 3.36 hotplate The part of an appliance incorporating one or several covered or open burners, with a pan support on top or a contact gnU or a heating plate. 3.37 ignition delay time The time between the ignition of the fiame supe
31、rvised, the appliance being at room temperature, and the moment when the effect of this flame is sufficient to keep the closing member open. 3.38 extinction delay time The time between the extinction of the flame supervised and the closure of the gas supply to the burner and to the pilot. 3.39 gripp
32、ing area An area of the appliance designed to be manipulated during normai use. 4 Classication 4.1 Classification of gases used Gases used are classified in families and groups accordmg to their Wobbe number. The third family, grouping liquefied petroleum gases, covers Wobbe indexes between 72,9 MJ/
33、m3 and 87,3 MJ/m3 (W,). It is subdivided into two groups, group P which covers the range of Wobbe indexes between 72,9 MJ/m3 and 76,s MJ/m3 and group B which covers the range of Wobbe indexes between 81,8 MJ/m3 and 87,3 Wh3. Group B is not covered by this standard 4.2 Classification of appliances Ap
34、pliances are classified into categories according to the gases that they use. However, for each country, only some of the categories mentioned below are applicable, on account of local gas supply conditions (types of gas and supply pressures). For these categories, no requirement different from thos
35、e defined in this standard shall be applied. The gas supply conditions and types of connection applicable to each country are given in Annex k Appliances within the field of application of this standard belong to the following categories: a) category 13B/P(30) An appliance Capable of using third fam
36、ily gases (propane, butane or their mixtures), without adjustment at nominal operating pressures from 28 mbax to 30 mbaq An appliance capable of using third family gases (propane, butane or their mixtures), without austment at nominal operating pressures of 50 mk, An appliance capable of burning thi
37、rd family gases (butane and propane), and operating without adjustment on the appliance using a pressure couple. For butane, appliances in this category may be used without austment at nominal operating pressures from 28 mbar to 30 mbar, for propane they are used at a nominai operating pressure of 3
38、7 mbar. An appliance capable of using third family gases of group P (propane), without adjustment at a nominai operating pressure of 37 mbw, An appliance capable of using third family gases of group P Cpropane), without adjustment at a nominal operating pressure of 50 mbar. b) category kVP(50) categ
39、ory I3+(2830/37) d) category I3P(37) e) category I3P(50) O BSI 1998 STD-BSI BS EN 497-ENGL 1998 lb24bb9 Ub78079 hl1 E 6 Constructiod characteristics NOTE. The test methods for verifying the compliance of the appliance to the requirements of this clause are indicated in 7.2. 5.1 Conversion to differe
40、nt gases The appliance sha operate under normal supply conditions specified in the instructions, without requiring any intervention on the inted gas circuit or the austers of the appiiance. Gas rate adjusters shall be locked and sealed by the manufacturer. 5.2 Materiais The quality and thickness of
41、materiais used in the construction of an appliance shall be such that the constructional and performance characteriscs are not aitered in use. in normal conditions of operation, cleaning or transport, the parts of the appliance: - shall withstand the mechanical, chemical and thermal actions to which
42、 they may be submitted - shail not be liable to any alteration which might impair their operation. Metallic parts not made of corrosion-resistant materials shail be covered with an effective protection against corrosion. This requirement does not apply to cast parts and cooking devices. Asbestos or
43、asbestos based material shall not be used. The surface treament and finish of materials likely to be in contact with food shall be such that they cannot contaminate or affect the food. 6.3 Ease of cleaning AU the parts of the appliance requiring frequent cleaning by the user (for example: cooking de
44、vices) shall be easily accessible without having to use a tool for dismantling. It shall be possible to put these parts back correctly and without difficulty by following the instnictions. Sharp corners and edges which could give rise to injury, for example during the cleaning of appliances, shall b
45、e avoided. It shall not be possible for the gas container, the connection tube and the parts of the gas circuit to be soiled by the spdiage of cooking juices. The appliance shall be designed in such a way that cooiung juices do not impair the safety of operation. Any part of the appliance installed
46、or adjusted at the factory and which does not need to be manipulated by the user shail be protected in appropriate fashion. To this end paint may be used provided tha it withstands the heat to which it is exposed during the normal operation of the appliance. Page 7 EN 497 : 1997 5.4 Strength The con
47、struction of an appliance shall be such that, during normal conditions of use: - any displacement of pasts; - any distortion; - any deterioration likely to impair its good performance will not occur. The materials used, the construction and the assembly of the body of the appliance shall be such tha
48、t the application of a load on the grid of the appliance placed on a horizontal plane under the test conditions described in 7.2.4 shall not cause any frachm or any permanent distortion greater than 1 mm at any point in the components of the appliance. 5.5 Assembly AU components which require assemb
49、ly by the user shall be designed in such a way that their incorrect mounting is not possible if the instructions are followed. 5.6 Stability 6.6.1 Stability of the appliance on a horizontal plane The appliance being placed on a horizontal surface, the tests described in 7.2.6.1 shall be carried out without: - the appliance fahg over, - any of its component parts becoming loose or moving in such a way that its operation is impaired; - lids falling accidentally from their raised position. 5.6.2 Stability of the appliance placed on a slope Under the test
