09-30192027-DC.pdf

a Date: 27 January 2009 Origin: European Latest date for receipt of comments: 30 April 2009 Project no.: 2008/03517 Responsible committee: GSE/27 Automatic gas and oil burners Interested committees: Title: Draft BS EN 299 Oil pressure atomizing nozzles - Determination of the angle and spray characteristics Supersession information: If this document is published as a standard, the UK implementation of it will supersede BSEN299 : 1999 and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below). WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 30 April 2009. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent. See overleaf for information on commenting. No copying is allowed, in any form, without prior written permission from BSI except as permitted under the Copyright, Designs and Patent Act 1988 or for circulation within a nominating organization for briefing purposes. Electronic circulation is limited to dissemination by e-mail within such an organization by committee members. Further copies of this draft may be purchased from BSI Customer Services, Tel: +44(0) 20 8996 9001 or email cservicesbsigroup.com. British, International and foreign standards are also available from BSI Customer Services. Information on the co-operating organizations represented on the committees referenced above may be obtained from the responsible committee secretary. Cross-references The British Standards which implement International or European publications referred to in this draft may be found via the British Standards Online Service on the BSI web site http:/www.bsigroup.com. Direct tel: 020 8996 7009 Responsible Committee Secretary: Committee Service Centre (BSI) E-mail: cscbsigroup.com Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 8.0 DPC: 09/30192027 DC Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:44, Uncontrolled Copy, (c) BSI b Introduction This draft standard is based on European discussions in which the UK has taken an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. Comment is particularly welcome on national, legislative or similar deviations that may be necessary. Even if this draft standard is not approved by the UK, if it receives the necessary support in Europe, the UK will be obliged to publish the official English Language text unchanged as a British Standard and to withdraw any conflicting standard. 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Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/www.bsigroup.com/en/Standards-and-Publications/Current-work/DPCs/ Template for comments and secretariat observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause No./ Annex (e.g. 3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that the mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a trademark of Microsoft Corporation. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:44, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM FINAL DRAFT prEN 299 January 2009 ICS 27.060.10Will supersede EN 299:1998 English Version Oil pressure atomizing nozzles - Determination of the angle and spray characteristics Gicleurs sans retour pour brûleurs à fioul domestique à pulvérisation - Détermination de l'angle et des caractéristiques de pulvérisation Öldruckzerstäuberdüsen - Prüfung der Sprühcharakteristik und des Winkels This draft European Standard is submitted to CEN members for unique acceptance procedure. It has been drawn up by the Technical Committee CEN/TC 47. If this draft becomes a European Standard, CEN 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. This draft European Standard was established by CEN 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 CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels © 2009 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. prEN 299:2009: E Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:44, Uncontrolled Copy, (c) BSI prEN 299:2009 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Testing 4 4.1 Testing of the radial distribution/spray pattern 4 4.1.1 Test equipment 4 4.1.2 Test procedure .5 4.1.3 Processing of test data .5 4.1.4 Spray uniformity and angle ratio 5 4.1.5 Classification of pattern types .5 4.2 Testing of the index angle 5 4.2.1 Test equipment 5 4.2.2 Test procedure .6 4.2.3 Processing of test data .6 4.2.4 Computation of index angle .6 4.3 Explanations .9 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:44, Uncontrolled Copy, (c) BSI prEN 299:2009 (E) 3 Foreword This document (prEN 299:2009) has been prepared by Technical Committee CEN/TC 47 “Atomizing oil burners and their components - Function - Safety - Testing”, the secretariat of which is held by DIN. This document is currently submitted to the Unique Acceptance Procedure. This document will supersede EN 299:1998. According to edition 1998 the following fundamental changes are given: test equipment in Figure 1 dimensioned. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:44, Uncontrolled Copy, (c) BSI prEN 299:2009 (E) 4 1 Scope This European Standard specifies a method for the determination of the spray characteristic and the index angle of oil pressure atomizing nozzles. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 293, Oil pressure atomizing nozzles Minimum requirements Testing 3 Terms and definitions For the purposes of this document, the following terms and definitions apply: 3.1 radial spray distribution-spray angle variation in liquid flux when proceeding from the nozzle axis to the edge of the conical spray pattern at a specified distance from the atomizer 3.2 index angle Y plane angle formed by a conical spray, wherein the magnitude of the angle is determined by a specified percentage, e.g. 80 %, of the total volume of liquid collected in a radial patternator 3.3 cumulative volume aggregate volume of liquid, expressed as a percentage of the total volume collected in a radial patternator, when proceeding from the spray axis (centre of the patternator) to the edge of the spray pattern 3.4 radial patternator device comprising a series of concentric annular compartments with a row of collection cylinders that is capable of measuring the radial spray distribution, as defined in 3.1 3.5 index arbitrary number assigned to a group of oil burner nozzles having similar spray patterns EXAMPLE “I“ indicating “solid“, see Table 1. 4 Testing 4.1 Testing of the radial distribution/spray pattern 4.1.1 Test equipment The radial patternator, as shown in Figures 1 and 2, shall be a cylindrical vessel having a bottom plate comprising 14 concentric dividers that provide annular compartments from which liquid may be drained into graduated collection cylinders. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:44, Uncontrolled Copy, (c) BSI prEN 299:2009 (E) 5 During testing, the top of the vessel shall be covered with a lid at whose centre a nozzle holder shall be mounted, which shall be vertically adjustable, so that the specified distance can be maintained between the nozzle orifice and the upper bevelled edges of the dividers. Means shall be taken to ensure that the annular compartments and collection cylinders are not exposed to the spray prior or subsequent to the period designated for the collection of liquid. 4.1.2 Test procedure The nozzle to be tested shall be mounted in the nozzle holder. The latter shall be adjusted so that the axial distance between the nozzle orifice and the upper edges of the dividers is 50 mm. Testing shall be conducted with a reference oil as specified by EN 293. The total volume atomized during each test shall be at least 80 ml and shall in any case be sufficient to provide representative quantities of liquid in the collection cylinders. At the conclusion of each test, the liquid volumes in each cylinder shall be recorded. 4.1.3 Processing of test data The recorded liquid volumes shall be tabulated along with the corresponding cumulative percentage volumes (see Table 3). Using the listed plane angles for each annular compartment, the cumulative volume (starting at the centre of the patternator) may be correlated with the plane angle subtended by that volume. Using this procedure, the continuous radial distribution may be represented in tabular or graphical form. 4.1.4 Spray uniformity and angle ratio The radial mass-distribution is a measure of spatial uniformity at a specified distance from the atomizer. For example, a nozzle with “solid“ spray pattern is relatively uniform, whereas a nozzle with “hollow“ spray pattern is characterized by a high concentration of liquid at the outside of the spray cane. An indication of uniformity or pattern type can be given by calculating the 50 % / 80 % angle ratio. The two angles are those which correspond to the 50 % and 80 % points in Table 3 (see 4.2.4). 4.1.5 Classification of pattern types The defined angle ratio shall be the basis for classifying spray pattern to the arbitrary indices in Table 1. Table 1 Index 50 % / 80 % angle ratio Qualitative description of spray pattern I 0,700 solid II 0,700 to 0,749 semi-solid III 0,750 to 0,799 semi-hollow IV 0,800 hollow 4.2 Testing of the index angle 4.2.1 Test equipment See 4.1.1. Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:44, Uncontrolled Copy, (c) BSI prEN 299:2009 (E) 6 4.2.2 Test procedure See 4.1.2. 4.2.3 Processing of test data See 4.1.3. 4.2.4 Computation of index angle The index angle for this standard is quantitatively defined as the 80 % angle. This is the angle according to Equation (1) corresponding to the inner angle where 80 % of the liquid volume is collected. () () () += 12 1 VV VV Y (1) where Y is the index angle; V is 50 %, if the 50 % index angle is to be computed, 80 %, if the 80 % index angle is to be computed; V1 is the cumulative volume in percent collected in all patternator compartments up to and including the compartment such that V1 is as large as possible without exceeding the value of 80 %, if the 80 % angle is computed, or without exceeding 50 %, if the 50 % angle is computed; V2 is the cumulative volume in percent collected in all patternator compartments up to and including the compartment such that V2 is as small as possible but still exceeds the value of 80 %, if the 80 % angle is computed, or still exceeds the value of 50 %, if the 50 % is computed; is the plane angle subtended by outer edge of compartment corresponding to V1; is the plane angle subtended by outer edge of compartment corresponding to V2. Table 2 Angle marking degrees Tested angle degrees 50 45 to 55 60 56 to 65 70 66 to 75 80 76 to 85 90 86 to 95 100 96 to 105 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:44, Uncontrolled Copy, (c) BSI prEN 299:2009 (E) 7 Dimensions in millimetres Figure 1 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:44, Uncontrolled Copy, (c) BSI prEN 299:2009 (E) 8 Dimensions in millimetres Figure 2 Licensed Copy: London South Bank University, South Bank University, 02/02/2009 03:44, Uncontrolled Copy, (c) BSI prEN 299:2009 (E) 9 Table 3 Tube No. Collected tube volume ml Cumulative volume % Plane angle degrees 1 2 1,923077 14,5 2 9 10,57632 28,5 3 14 24,03846 41,7 4 22,5 45,67308 53,9 5 25 69,71153 64,8 6 14,5 83,65384 74,6 7 5,5 88,9423 83,3 8 3 91,82691 90,9 9 2,5 94,23076 97,6 10 2 96,15384 103,6 11 2 98,07692 108,8 12 2 100,0 113,5 13 0 100,0 121,3 14 0 100,0 128,5 EXAMPLE Example showing collected liquid volumes, conversion to cumulative percent volume, and corresponding plane angles: Test references: oil burner nozzle “Hollow“ 0,85 GPH 60 Pressure: 10 bar The test shall be performed with a reference oil as defined in EN 2