BS EN 1267-2012

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BSEN1267 2012
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raising standards worldwide™NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 1267:2012Industrial valves — Test of flowresistance using water as testfluidLicensed copy: Bradford University, University of Bradford, Version correct as of 31/01/2012 20:24, (c) TheBritish Standards Institution 2012BS EN 1267:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 1267:2012. Itsupersedes BS EN 1267:1999 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PSE/18/1, Industrial valves, steam traps, actuators andsafety devices against excessive pressure - Valves - Basic standards.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication.© The British Standards Institution 2012ISBN 978 0 580 67641 3ICS 23.060.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 January 2012.Amendments issued since publicationDate Text affectedLicensed copy: Bradford University, University of Bradford, Version correct as of 31/01/2012 20:24, (c) TheBritish Standards Institution 2012BS EN 1267:2012EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 1267 January 2012 ICS 23.060.01 Supersedes EN 1267:1999English Version Industrial valves - Test of flow resistance using water as test fluid Robinetterie industrielle - Essai de résistance à l'écoulement utilisant l'eau comme fluide d'essai Industriearmaturen - Messung des Strömungswiderstandes mit Wasser als Prüfmedium This European Standard was approved by CEN on 26 November 2011. 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. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1267:2012: ELicensed copy: Bradford University, University of Bradford, Version correct as of 31/01/2012 20:24, (c) TheBritish Standards Institution 2012BS EN 1267:2012EN 1267:2012 (E) 2 Contents Page Foreword 41 Scope 52 Normative references 53 Terms and definitions .54 Test facility .64.1 General 64.2 Test tube lengths .84.3 Test tube sizes .84.3.1 Steel test tubes 84.3.2 Copper test tubes 94.4 Pressure tappings94.5 Measurement devices 104.6 Test fluid 105 Test procedure 105.1 Test conditions . 105.1.1 Permissible measurement fluctuations 105.1.2 Steady conditions . 115.1.3 Permissible non-steady conditions 115.2 Pressure loss in test tubes 115.3 Valve test . 126 Calculation . 136.1 Valve pressure loss determination . 136.2 Coefficient calculations . 146.2.1 Flow resistance coefficient ζ (zeta). 146.2.2 Flow coefficient, Kv. 146.2.3 Flow coefficient, Cv. 146.3 Uncertainty 156.3.1 Total measurement uncertainty 156.3.2 Flow coefficients, Kvand Cv. 156.3.3 Pressure loss coefficient, ζ (zeta) . 167 Test report . 16Annex A (informative) Lower ζ limit considerations . 18Annex B (informative) Flow rate and physical phenomena of flow through a valve . 19B.1 General . 19B.2 Normal flow conditions 20B.3 Cavitation . 21B.4 Flashing (self-vaporizations) . 21Annex C (informative) Uncertainty on measurement . 22C.1 Introduction . 22C.2 Permissible measurement fluctuations 22C.2.1 General . 22C.2.2 Direct visual observation of signals delivered by the systems . 22C.2.3 Automatic recording of signals delivered by measurement systems . 23C.2.4 Automatic integration of signals delivered by the measurement systems 24C.3 Measured value stability on physical quantities . 25C.4 Determining flow rate and pressure loss coefficients in turbulent rating condition . 26Annex D (informative) Evaluation of uncertainty of flow rate coefficient (Kv) and pressure losses coefficient (ζ) . 27D.1 Generality 27D.2 Evaluation of measurement uncertainty of the Kv(Cv) 27Licensed copy: Bradford University, University of Bradford, Version correct as of 31/01/2012 20:24, (c) TheBritish Standards Institution 2012BS EN 1267:2012EN 1267:2012 (E) 3 D.2.1 Determination of flow rate coefficient . 27D.2.2 Identification of uncertainty of input quantities . 28D.2.3 Sensitivity coefficient 28D.2.4 Type A evaluation uncertainty . 29D.2.5 Expression of relative uncertainty . 29D.3 Evaluation of measurement uncertainty of the ζ . 30D.3.1 Determination of flow resistance coefficient 30D.3.2 Identification of uncertainty of input quantities . 30D.3.3 Sensitivity coefficient 30D.3.4 Type A evaluation uncertainty . 32D.4 Expression of relative uncertainty on ζ 32Bibliography 33Licensed copy: Bradford University, University of Bradford, Version correct as of 31/01/2012 20:24, (c) TheBritish Standards Institution 2012BS EN 1267:2012EN 1267:2012 (E) 4 Foreword This document (EN 1267:2012) has been prepared by Technical Committee CEN/TC 69 “Industrial valves”, the secretariat of which is held by AFNOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by July 2012, and conflicting national standards shall be withdrawn at the latest by July 2012. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1267:1999. The main changes compared to the previous edition are the following: a) the scope was specified and editorially revised; b) the normative references were updated; c) Clause 3 on terms and definitions was revised; d) Clause 4 on test facility was changed; e) Clause 5 on test procedure was changed; f) Annex A on lower ζ limit considerations was revised; g) Annex D on evaluation of uncertainty of flow rate coefficient (Kv) and pressure losses coefficient (ζ) was added; h) a bibliography was added. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, 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, Turkey and the United Kingdom. Licensed copy: Bradford University, University of Bradford, Version correct as of 31/01/2012 20:24, (c) TheBritish Standards Institution 2012BS EN 1267:2012EN 1267:2012 (E) 5 1 Scope This European Standard specifies a method for determining valve pressure loss coefficient and fluid flow coefficient using water as test fluid. This method is suitable  for valves with low zeta values but higher than 0,1 by determining pressure loss, with respect to fluid flow rate and specific gravity, and  for valves with equal inlet and outlet nominal size. Industrial process control valves are excluded from this European Standard. NOTE 1 For zeta values above 6, the pressure loss coefficient inaccuracy is higher than the pressure loss caused by the test tubes. It becomes the same configuration of tests as in EN 60534-2-3. NOTE 2 If using air as test fluid, other standards e.g. EN 60534-2-3 and ISO 6358 should be referred to. 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 736-1:1995, Valves — Terminology — Part 1: Definition of types of valves EN 736-3:2008, Valves — Terminology — Part 3: Definition of terms EN 1057, Copper and copper alloys — Seamless, round copper tubes for water and gas in sanitary and heating applications EN 24006:1993, Measurement of fluid flow in closed conduits — Vocabulary and symbols (ISO 4006:1991) EN ISO 6708:1995, Pipework components — Definition and selection of DN (nominal size) (ISO 6708:1995) ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads — Part 1: Dimensions, tolerances and designation ISO 7194:2008, Measurement of fluid flow in closed conduits — Velocity-area methods of flow measurement in swirling or asymmetric flow conditions in circular ducts by means of current-meters or Pitot static tubes 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 flow coefficient Kvor Cv[EN 736-3:2008, 3.4.1] Licensed copy: Bradford University, University of Bradford, Version correct as of 31/01/2012 20:24, (c) TheBritish Standards Institution 2012BS EN 1267:2012EN 1267:2012 (E) 6 3.2 flow resistance coefficient ζζ [EN 736-3:2008, 3.4.5] 3.3 fluctuations low period modifications of the measured value of a physical quantity around its mean value during the measurement reading time 3.4 nominal diameter DN [EN ISO 6708:1995, 2.1] 3.5 stability stability, or the permanent rating conditions, which is reached, when the variations or value changes for these same physical quantities are low enough between a given reading and the next one 3.6 types of valves [EN 736-1:1995] 3.7 uncertainty [EN 24006:1993, 5.26] 4 Test facility 4.1 General A basic flow test facility is shown in Figure 1. The position of components outside the frame may be determined by the laboratory. For angle valves (Figure 1 b)), the tested valve and the tube section (L3length) may be laid either vertically or horizontally. For multi-way valves, additional test tubes of the same type shall be used, in the same conditions. Licensed copy: Bradford University, University of Bradford, Version correct as of 31/01/2012 20:24, (c) TheBritish Standards Institution 2012BS EN 1267:2012EN 1267:2012 (E) 7 NOTE L1and L3≥ 10 D and L2and L4≥ 2 D. a) Straight valves b) Angle or multiport valves Key 1 water supply 6 upstream pressure measuring device 2 flow meter 7 valve under test 3 temperature measurement 8 downstream pressure tapping point 4 regulating valve 9 regulating valve 5 upstream pressure tapping point 10 differential pressure measuring device Figure 1 — Test installation Licensed copy: Bradford University, University of Bradford, Version correct as of 31/01/2012 20:24, (c) TheBritish Standards Institution 2012BS EN 1267:2012EN 1267:2012 (E) 8 4.2 Test tube lengths The test tube lengths and the pressure measurement point positions shall comply with Figure 1. Lengths are measured from test tube ends. If the test facility includes two elbows in series in different planes upstream, a link L1greater than 10 D, shall be adopted unless straightener is installed before the upstream test tube. If a flow straightener is used, length L1may be smaller than 10 D, provided that the conditions in 5.1 are met. For other details concerning flow straighteners, refer to ISO 7194:2008, Clause 6. 4.3 Test tube sizes 4.3.1 Steel test tubes The test tubes (dimensions DN 8 to DN 150) can be threaded with an external taper thread as per ISO 7-1 (but with the pressure tap length indicated in Table 1) for use with threaded end valves, and also in order to adapt threaded flanges for flanged valves. Table 1 — Tube sizes Nominal size of valve DN Nominal size of tube mm Thread size Gauge length mm 8 13,5 × 2,3 ¼ 11,0 10 17,2 × 2,3 ⅜ 11,515 21,3 × 2,6 ½ 15,0 20 26,9 × 2,6 ¾ 16,5 25 33,7 × 3,2 1 19,0 32 42,4 × 3,2 1 ¼ 21,5 40 48,3 × 3,2 1 ½ 21,5 50 60,3 × 3,6 2 25,5 65 76,1 × 3,6 2 ½ 30,0 80 88,9 × 4,0 3 33,0 100 114,3 × 4,5 4 39,0 125 139,7 × 5,0 5 43,5 150 165,1 × 5,0 6 43,5 200 219,1 × 3,6 250 273,0 × 4,0 300 323,9 × 4,5 350 355,6 × 5,0 400 406,4 × 5,0 450 457,0 × 5,0 500 508,0 × 5,6 600 610,0 × 6,3 NOTE The nominal dimensions of DN 8 to DN 150 are in accordance with ISO 65, medium series and ISO 7598. The nominal dimensions of DN 200 to DN 600 are in accordance with ISO 4200, series C and EN ISO 1127. Licensed copy: Bradford University, University of Bradford, Version correct as of 31/01/2012 20:24, (c) TheBritish Standards Institution 2012BS EN 1267:2012EN 1267:2012 (E) 9 4.3.2 Copper test tubes Table 2 — Copper test tubes Nominal size of valve DN Nominal size of tube mm 8 10 × 0,810 12 1,015 15 × 1,0 15/20 18 1,020 22 × 1,025 28 1,5 32 35 × 1,540 42 1,550 54 × 1,5 Dimensions and tolerances shall be in accordance with EN 1057. Test tubes shall be straight. Their ends shall be cut square and deburred. Their internal surfaces shall be cleaned and free from obstructions visible to the naked eye. Inner diameters are determined by the valve manufacturer unless otherwise specified in a valve, product or application standard. For valves with low ζ coefficient, the results obtained are affected by the test tube inner diameter. Therefore, the actual test tube inner diameter shall be mentioned (see Clause 7 b)). NOTE When new test tubes are made, it is recommended to make them in accordance with Table 1 and Table 2. 4.4 Pressure tappings The number of pressure taps is determined by the laboratory. At each pressure measurement section, there can be one, two or four tabs or a slot, provided that eccentricity is controlled. There should be four measurement taps for sizes greater than DN 300. Pressure tap diameters shall comply with Table 3 and length shall be at least twice the diameter. The measurement tap hole on test tube internal surface is sharp-edged and free from burrs. The measurement tape hole centreline cuts the axis of the test tube. The pressure tap hole centreline is square to axis with a maximum tolerance of 5°. The inner diameter of connection tubes b
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