1、I CEN ENS293 92 3404589 0025939 T EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 293:1992 nay 1992 UDC 662.944-225.8 Descriptors: Jet pumps, liquid fuel appliances, domestic fluid, atomizing burners, definitions, equipment specifications, perforaiance evaluation, flow rate, spraying, tests, in
2、spection, mejkiog English version , Oil pressure atomizing nozzles - Minimum requirements - Testing Gicleurs sans retour pour brleurs fioul domestique pulvrisation - Prescriptions minimales - Essais ldruckzerstuberdsen - Hindestanforaeiungen - Prfungen This European Standard was approved by CEN on 1
3、992-04-30. CEM members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-tedate lists and bibliographical references concerning such national standards may be obt
4、ained 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 translation under the responsibility of a CEN member into its own language and notified to the Centra Secr
5、etariat. has the came status as the official versions. CEN members are the national standards bodies of Austria, elgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdoa. CEN European Committe
6、e for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart,% -1Mo russels o 1992 Copyright reserved to CEN members Ref. No. EN 2931992 E I CEN EN*293 92 3404589 0025920 b Page 2 EN 293:1992 Foreword This European Standard was drawn up by
7、the Technical Committee CEN/TC 47 “Atomizing oil burners and their components - Function - Safety - Testing“. It has been submitted to the Formal Vote and it is now adopted. National Standards identical to this European Standard shall be published at the latest by 1992-11-30 and conflicting national
8、 standards shall be withdrawn at the latest by 1992-11-30. According to the CEN/CENELEC Common Rules, the following countries are bound to implement this standard : Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain,
9、 Sweden, Switzerland and United Kingdom. CEN EN*2613 92 H 3404589 0025923 8 E Page 3 EN 293:1992 1 Scope This European Standard applies to oil pressure atomizing nozzles without back- flow - herein called atomizing nozzles - with a nominai throughput s 6,30 kg/h at 10 bar with a fuel oil. They are c
10、haracterized by the requirements concerning the operational function according to clause 5. - 2 Normative references . This European Standard incorporates by dated or undated reference, provi from other publications. These nonnative references are cited at the app places in the text and the publicat
11、ions are listed hereafter. For dated ces, subsequent amendments ta or revisions of any of these publications this European Standard only when Incorporated In It by amendment or revi For undated references the latest edltion Of the publication referred to applies. iropr refe acP 1 sion ENV 299 Oil pr
12、essure atomizing nozzles; Angle- and spray characteristics 3 Definitions 3.1 Atomizlng nozzle An atomizing nozzle Is a device in whlch fuel oll is atomfzed through trans- formation of pressure energy into kinetic energy. The atomizing nozzle is an essential part of the oil atomizing burner, and, tog
13、ether with the mixing device, it provldes a combustible Ofl/ar-mlXtUfC. In this standard atomizing nozzles are devices working without by-pass in ccm- pliance with the flow principle (Slmplexnottles). 3.2 Reference condltlons The reference conditions comprise test pressure, test temperature, vlscosl
14、ty, surface tension and density of the test oll at the time of the test, at speci- fied values at a point imnediately upstream of the nozzle. 3 3 Homl na1 throughput The nominal throughput it the mass flow expressed in kg/h at 10 bar. 3.4 Test pressure The oil pressure is measured imncdlately before
15、 the atM flgure 2). zing nozz t (see 3.5 Index angle See E3V 209. CEN EN*273 72 3404589 O5922 T E Page 4 EN 293:1992 3.6 Sectionai distribution The sectional distribution of an atomizing nozzle indicates a degree of syrrmetry of the atomizing cone. 4 Construction requirements 4.1 Components The comp
16、onents used for atomizing ical, thermal and chemical demands zzles shall be able to withstand the mechan- to which they are exposed during operation. The atomizing nozzle shall be free of manufacturing residues and other contamination, test oil excepted. During installation and maintenance, observed
17、. the directions of the manufacturer shall be The atomizing nozzles shall be provided with a strainer or filter with a mesh size of maximum 75 micron - at a nominal throughput of 1,00 - 3,15 kg/h - and maximum 140 micron - at a nominal throughput of 3,55 - 6,30 kg/h - or giving equivalent filtration
18、. The atomizing nozzle shall be temperature resistant up to and including 120 OC. 4.2 Dimensions To secure the interchangeability of atomizing nozzles, the dimensions defined in figure 1 shall be observed. 5 Functional requirements The atomizing nozzles shal rily at the prescribed nom the manufactur
19、er . Under normal conditions of be shaped so as to atomize the fuel oil satisfacto- na1 throughput and the pressure range indicated by application and mounting, any changes which might influence the functional abilities of the nozzle are not permissible. 5.1 Pressure resistance The atomizing nozzle
20、shall be designed so that it can withstand a static pressc re of 50 bar. 5.2 Reference test conditions The nozzle testicg snall Ye carried out under reference conditioris as tolicws: pressure : vi scosi ty: density : surface tension : timcer3tur-e : (10 - + 0,035) bar (3,4 + 0,04) mz/s (0,840 + il,O
21、l) kg/ (2.95 + o,20).10-z Umz (23 + 1 ) C - - - - CEN EN*293 92 3484589 8025923 1i I Nomi na 1 throughput kg/h 1 ,o0 1,25 1 ,o0 1.80 2.00 2.25 2.50 2.80 3.15 3.55 4 ,O0 4,50 5.00 5,60 6,30 Page 5 EN 293:1992 Throughput max. value min. value kglh kgl h 1,040 O, 960 I. 300 1,200 1,664 1,536 1,872 I, 7
22、28 2 , O80 1 , 920 2,340 2,160 2,600 2,400 2,912 2 , 688 3,276 3,024 3,692 3,408 4,160 3,840 4,680 4,320 5,200 4,800 5,824 5 ,376 6,552 6 , 048 5.3 Nominal throughput The nominal throughput at a test Pressure of 10 bar and the permissible toleran- ces of + 4 % are given In table 1. Intermediate valu
23、es are permissable, if the talerances are adhered to (Throughput ValUeS in l/h and gal/h see annex A). TcSle 1 Nominal throughput 6 Testing 6.1 General After the tests for throughput, and the tests in respect of ENV 299 have been made wlth the reference oil as defined in 5.2, a flnal test for pressu
24、re resl- s:ance and temperature resistance shall be made. 6.2 Pressura resstanca test After deairatlon of the atomlzing nozzle the nozzle orifice shall be closed and a test pressure of 50 bar shall be applled for at least 5 min. The atomizing nozzle shall then be submitted to a visual check. 6.3 Ten
25、perature resistance test The ternoerature resistance shall be detemincd by exposing the atomizing nozzle, with Its strainer or filter, gradually up to a tmerature of 120 “C (the ajfll- mtlm time for the temperature increase is 15 min). The tmperaturc of 120 OC shall be keot constant for at least 15
26、minutes. The csollng shall be equally gradual, after which the atmizing nozzle shall be dlsasserribkd and the several nozzle parts Shall be subject tg a visual cmk. CEN ENS293 92 3404589 8025924 3 Is Page 6 EN 293:1992 6.4 Test of throughput 6.4.1 Test equlpment (Example) Tho oil-feedlng device upst
27、ream of the atomlzing nozzle (see for example figure 2) Is composed of the following parts: - Oil tank - flow meter - pump, equipped with a pressure-regu - fast actlng toroidal valve to be sw - nozzle adapter atlng device tched on or off wlth a timer - oil collector to receive the atomized fuel oll
28、to which a welghing device is connected tci measure the throughput It shall be guaranteed that all CCnneCtlng pipes from the tank to the toroidal valve are always fllled with the test oll (fit a devlce to avoid back-flow, tank to be arranged at the upper part of the test rig.), so that the starting
29、tlme can be reduced and errors, resulting from mis-feeding, can be avolded. 6.4.2 Test spec1 fi cat1 ont The reference oll shall be examined frequently as to its characteristics and conformi ty to 5.2. By means of measuring devlces, fitted directly upstream of the atomizing nozzle, the oil-temperatu
30、re is recorded (sensor or thenno-elements) and the values of the atomizing pressure (pressure control devlcc) are Indicated. The measuring devices to detenlne to the oll-througput, the atomizing pressure and test circle may have a maximum measuring accuracy of i 0,4 X. 6.4.3 Test procedure Test with
31、 equipment as given In 6.4.1. (Example) The atcrniting nozzle to be tested Is screwed Into the adapter. The torodial valve is opened to regulate the pressure and the temperature. When the operational state 1s establlshed, the torodlal valve shall be closed for a moment to check the welght on the wel
32、ghlng device. Hereafter, the test Shall be carrled out, the duration ofwhlch 1s as long as pre-detenined by tae tlmer. 6.4.4 Test method and evaluation of results Distinction between two test methods is made. The throughput measured shall be wlthln t,cie tglerancas Stated in table i (see 5.3). CEN E
33、N*K293 72 E 3404589 0825925 5 a Page 7 EN 293:1992 6-4.4.1 Grav ime t ri c method Oetennination of throughput by mass The test oil collected during the measuring period is related to throughput Is expressed in kg/h. it time. ie 6.4.4.2 Volumetrlc method Determination of throughput by measurement of
34、VOORO By multiplying the obtained value in l/h by the density of oil in kg/l, the- throughput, expressed In kg/h, is obtalned. 6.5 Testing of the Spray Characterlstlcs Seo ENV 299 6.6 Spray distribution 6.6.1 Test equipment Sectorial patternator with cylindrical tank, the mlnlmum Internal diarnetj,r
35、 of which is 278 m and the bottcm of which 1s sllghtly sloped and divided inta 12 sectlons, each of them having an apex angle of 30 degrees. Each sec%ion is connected at the lower part via an oll dlscharge pipe to a ver- tically positioned calibrated gauge, graduated up to 50 ml. The upper part of t
36、he tank 1s covered, the nozzle adapter shall be placed verti- cally In the centre of the cover: the adapter shall be adjustable upwards and downwards and shall be turnable for 360 degrees around Its vertlcal axis. The adapter axis shall colncide exactly wlth the centre of each of the 12 sections. 6.
37、6.2 Test procedure The nozzle to be tested 1s screwed Into the adapter. The distance between nozzle orifice and upper part of the center tube of the sections is 50 mn (sec figure 3). . The test shall be carrled out after an opeitlnq state dutlng which the atm- ltlng pressure Is set to 10 bar. Ouring
38、 the starting phase, the graduated gauges are covered, so that no raamcs oll may enter. The test begins as soon as the atomlzlng pressure has stabllized and when the vlscoslty of the test oil cornplles wlth the rcquirments fixed In 5.2. The gauges mal1 then be uncovered without lntertuptlng the atom
39、izing. The test is ccmoletcd as soon as one of the gauges is fllled wlth50 ml of oil. The gauges Shall then be covered and the atantzing be Interrupted. 6.6.3 Evaluatlon of results The dlstrlbution of the spray pattern 1s characterized by the level of oil crn- tained In the 12 gauges. The distributi
40、on of test oil shall be recorded for em of t9e gauges and the arithmetic mean value be determined. This mean value is campared wlth the abtalned lowest value. The result allows to determine the distrlbutlon symnetry of the nozzle. CEN EN*293 92 3404589 002592b 7 E Page 8 EN 293:1992 An example is gi
41、ven below: - values recorded for gauges 1 to 12: 41, 44, 42, 47, 50, 46, 47, 48, 36, 40, 43, 43 - Arithmetic mean value: 43,9 - minimum value: 36 - a 0.82 Ar1 thmetic mean value: 43.9 6*6*4 Limit values The distribution characteristic of an atomizing nozzle shall be deemed satisizc- tory when values
42、 obtained during evaluation according to 6,6,3 are above 0.7. 6.7 Testing of the Index angle See ENV 299 7 Marklng Each nozzle shall be provided wlth the following Information in an indelible manner: brandmark or manufacturers identification mark nominal throughput in kg/h at 10 bar (as indicated in
43、 table 1) Index angle, in degrees (see ENV 299) type of spray-pattern, clther by indlcatlng a code or full indicatlon (see ENV 299) conforml ty mark It is left to the manufacturer to mark on the nozzle body any other additional i n f o mat 1 on. CEN EN*293 92 W 34045kIe1 0025927 9 = Figure 1 .- Page
44、 9 EN 293:1992 CEN EN*293 92 W 3404589 0025928 O = Page 10 EN 293:1992 1) Oil tank 2) Temperature- regu 1 at i ng device (if provided) 3) Weighing device 4) Pump 5) Pressure regulator 6) Toroidal valve 7) Timer 8) Precision manometer 9) Device to measure and record the temperature 10) Atomizing nozz
45、le 11) oil collector Figure 2. Example of equipment to test the flow through an atomizing nozzle CEN E“AZ93 92 W 3404589 0025929 2 Page 11 EN 293:1992 X (312 1 I I 1 ! w h h ! Figure 3 _ Page 12 EN 293:1992 CEN EN*293 92 3404589 0025930 9 - Figure 4 - c patternator feed pipes cover 15 calibrated gau
46、ges figure 5 - CEN EN*293 92 3404589 0025933 O Thro Page 13 EN 293:1992 Ihput Annex A. (Informative) NomInal throughput In l/h and gal/h at 10 bar Nominal throughput kg/h 1 ,o0 1,25 1,60 1,80 2,oo 2,25 2,50 2,8O 3,15 3,55 4,OO 4,50 5,oo 5,60 6,30 1 /h 1 * 190 1,488 1,904 2,142 2,380 2 , 678 2,975 3
47、, 332 3 , 748 4 , 224 4,760 5,355 5 , 950 6,664 7,497 gal /h 0,314 O ,393 O, 503 O, 566 O , 629 0,708 O ,786 0,881 0,991 1,116 1,258 1,415 1,572 1,761 1,981 - Note: Atomlzlng nozzle (simplex nozzle) with a throughput of hlghcr than 6,30 kg/h In llne wlth this European standard can, If agreable, be tested In accordance wlth this standard.
