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1、BRITISH STANDARD BS EN 12237:2003 Ventilation for buildings Ductwork Strength and leakage of circular sheet metal ducts The European Standard EN 12237:2003 has the status of a British Standard ICS 91.140; 91.140.30 ? Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:40:53 GMT+00:00 2006, Unc
2、ontrolled Copy, (c) BSI BS EN 12237:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 16 April 2003 BSI 16 April 2003 ISBN 0 580 41588 0 National foreword This British Standard is the official English language version of EN 12237:2003. The
3、 UK participation in its preparation was entrusted to Technical Committee RHE/2, Air distribution and air diffusion, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implem
4、ent international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does
5、 not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European
6、 committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages
7、2 to 11 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:40:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STAND
8、ARD NORME EUROPENNE EUROPISCHE NORM EN 12237 April 2003 ICS 91.140; 91.140.30 English version Ventilation for buildings - Ductwork - Strength and leakage of circular sheet metal ducts Ventilation des btiments - Rseau de conduits - Rsistance et tanchit des conduits circulaires en tle Lftung von Gebud
9、en - Luftleitungen - Festigkeit und Dichtheit von Luftleitungen mit rundem Querschnitt aus Blech This European Standard was approved by CEN on 18 December 2002. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
10、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 Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German
11、). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finlan
12、d, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stas
13、sart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12237:2003 E Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:40:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12237:2003 (E) 2 Contents page
14、Foreword. 3 1Scope 4 2Normative references . 4 3Terms, definitions and symbols 4 3.1Terms and definitions. 4 3.2Symbols . 6 4Classification. 6 5Requirements 7 5.1Leakage 7 5.2Strength 7 6Test rig specification 7 7Test procedure strength and leakage. 7 7.1Test sample 7 7.2Test method. 7 7.3Correction
15、 of leakage test result. 8 8Test report 8 Annex A (informative) Recommended procedure if the permitted air leakage rate is exceeded when testing a specific installation. 10 Bibliography . 11 Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:40:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN
16、 12237:2003 (E) 3 Foreword This document (EN 12237:2003) has been prepared by Technical Committee CEN /TC 156 “Ventilation for buildings“, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or b
17、y endorsement, at the latest by October 2003, and conflicting national standards shall be withdrawn at the latest by October 2003. Annex A is informative. The standard is one of a series of standards for ductwork used for ventilation and air conditioning of buildings for human occupancy. The positio
18、n of this standard in the field of mechanical building services is shown in Figure 1. Mechanical building services Control SystemsVentilation and air conditioning systems Heating Systems Air handling unitsDuctworkInstallation Sheet metal air ducts with circular cross section - Dimensions Circular sh
19、eet metal air ducts Requirements for strength and leakage Rectangular sheet metal air ducts Requirements for strength and leakage Ductwork hangers and supports Requirements for strength FlangesSheet metal air ducts with rectangular cross section -Dimensions Measurement of duct surface area Requireme
20、nts for ductwork components to facilitate maintenance Determination of mechanical energy loss Flexible ducts Ductwork made of insulation ductboards Figure 1 Position of EN 12237 in the field of mechanical building services Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:40:53 GMT+00:00 200
21、6, Uncontrolled Copy, (c) BSI EN 12237:2003 (E) 4 According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Ic
22、eland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom. 1 Scope This European Standard specifies requirements and test methods for strength and air leakage of circular ductwork used in air conditioning and ventilation syst
23、ems in buildings. The standard is intended to establish the mechanical strength and leakage required to verify the fitness for the intended service as installed ductwork. The standard is intended for testing specific installations as well as product series in general under in-situ or laboratory cond
24、itions. The requirements and methods are applicable also to rectangular ductwork in respect of air leakage. A recommended procedure, if the permitted air leakage rate is exceeded when testing a specific installation, is given in informative annex A. 2 Normative references This European Standard inco
25、rporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this E
26、uropean Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments). CR 12792:1997, Ventilation for buildings Symbols and terminology. prEN 14239:2001, Ventilation for buildings Ductwork Measu
27、rement of ductwork surface area. 3 Terms, definitions and symbols 3.1 Terms and definitions For the purposes of this European Standard the terms and definitions given in CR 12792:1997 apply. 3.1.1 duct surface area Aj surface area of the ductwork under test see prEN 14239:2001 3.1.2 total joint leng
28、th L actual total length of the periphery of the installation joints included in the test section of the ductwork 3.1.3 test pressure ptest static air pressure difference between the pressure within the ductwork to be tested and the pressure of the surrounding air Licensed Copy: sheffieldun sheffiel
29、dun, na, Sat Oct 28 11:40:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12237:2003 (E) 5 3.1.4 design operating pressure pdesign maximum static air pressure difference at which the installed ductwork is designed to operate under normal conditions 3.1.5 static pressure limit ps maximum design oper
30、ating pressure for the ductwork according to its air tightness class NOTEThe static pressure limits, positive and negative, for the appropriate air tighness class are specified in Table 2. 3.1.6 air leakage rate qv air leakage flow rate of the ductwork under test 3.1.7 measured air leakage rate qvlm
31、easured air leakage flow rate before correction 3.1.8 air temperature t temperature of the air during the test 3.1.9 atmospheric pressure pa barometric pressure of ambient air during the test 3.1.10 air leakage factor f leakage flow rate per unit surface area of the duct (f = qv I Aj) 3.1.11 air lea
32、kage limit fmax maximum permitted leakage factor for the ductwork according to its air tightness class Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:40:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12237:2003 (E) 6 3.2 Symbols The nomenclature shown in Table 1 is used throughout this
33、European Standard. Table 1 Symbols SymbolQuantityUnits AjDuct surface aream2 fAir leakage factorm3s-1m-2 fmaxAir leakage limitm3s-1m-2 LTotal joint lengthm pAbsolute static pressurePa paAtmospheric pressurePa pdVelocity pressurePa pdesignDesign operating pressurePa prStagnation (or absolute total pr
34、essure)Pa psStatic pressure limit (p - pa)Pa ptestTest pressurePa qvlmeasuredMeasured air leakage volume ratem3?s-1 or l?s-1 qvVolume rate of air flow at the flow meterm3?s-1 or l?s-1 qvlLeakage volume rate of air flowm3?s-1 or l?s-1 tAir temperatureC 4 Classification The air tightness classes shall
35、 be as specified in Table 2. Table 2 Ductwork Classification Air tightness class Static pressure limit (ps) Pa Air leakage limit (fmax) m3s-1m-2 PositiveNegative A5005000,027 pt0,65 10-3 B1 0007500,009 pt0,65 10-3 C2 0007500,003 pt0,65 10-3 D a2 0007500,001 pt0,65 10-3 a Ductwork for special applica
36、tions. Licensed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:40:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12237:2003 (E) 7 5 Requirements 5.1 Leakage The leakage factor (f) shall be lower than the air leakage limit (fmax), corresponding to the required air tightness class, specified in Ta
37、ble 2 for any test pressure (ptest) lower than or equal to the design operating pressure (pdesign). The requirements shall be satisfied for positive and negative pressures. 5.2 Strength The ductwork shall withstand the static pressure limits (ps) specified in Table 2 without permanent deformation, o
38、r any sudden change in leakage flow rate or test pressure. A deformation shall be reported only when it gives a cross section area reduction of at least 10 %. 6 Test rig specification The test rig shall be inspected by the user before use on site and shall have a calibration certificate, chart or gr
39、aph, indicating satisfactory calibration within one year of the test for which it is to be used. 7 Test procedure strength and leakage 7.1 Test sample 7.1.1 Sample for testing a specific installation in situ The section to be tested shall be sealed off from the rest of the system before commencing t
40、he test. The test sample shall contain a representative variety of duct dimensions and fittings. The ductwork surface area of the section shall be at least 10 % of the total ductwork surface area, and if possible, at least 10 m2. NOTEThe normal ratio between the total joint length (L) and ductwork s
41、urface area (Aj) is: 1,51 j A L in m-1 7.1.2 Sample for testing a product series in general The test sample shall contain a representative variety of duct dimensions and fittings. Straight ducts of a minimum length of 2,5 m shall be included in the test section. The ductwork surface area to be teste
42、d shall be at least 10 m2. The ratio between the total joint length (L) and ductwork surface area (Aj) shall be: 1 j A L in m-1 7.2 Test method 7.2.1 Method for testing a specific installation The section to be tested shall be subjected to test pressures, positive and negative, not lower than its de
43、sign operating pressure (pdesign). The leakage rate readings shall be recorded under stable conditions, i.e. when each test pressure has been maintained within 5 % of the specified value for 5 minutes. NOTEA recommended procedure for the case of excessive air leakage rate is given in annex A. Licens
44、ed Copy: sheffieldun sheffieldun, na, Sat Oct 28 11:40:53 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 12237:2003 (E) 8 7.2.2 Method for testing a product series in general The test sample shall be subjected to several test pressures, at least 5 positive and 5 negative, within a range of test press
45、ures up to and including the static pressure limit (ps). The leakage rate reading shall be recorded under stable conditions, i.e. when each test pressure has been maintained within 5 % of the specified value for 5 minutes. 7.3 Correction of leakage test result The measured leakage flow rate shall be
46、 corrected if the temperature (t) and/or atmospheric pressure (pa) are different from the standard conditions (+ 20 C and 101 325 Pa) as follows: 101325273 293 a vlmeasuredvl p t qq + = 8 Test report The test report shall include the following information on the tests: a) the date and place of test;
47、 b) the test personnel and witnesses; c) a record of the test equipment, including the means of pressurising the sample and the measuring instruments with the appropriate calibration reference; d) the air temperature and atmospheric pressure during the test; e) the building or project reference; f)
48、the design of the installed ductwork including dimensions, length, type of ducts and fittings, assembly method, and the type and distance of hangers/supports; g) the required air tightness class and design operating pressure of the installed ductwork; h) the identity of the installer of ductwork; i)
49、 the identity of the manufacturer of ductwork; The test report shall also include the following: j) the measured values of: 1) ductwork surface area (Aj); 2) total joint length (L); 3) test pressure (ptest); 4) air leakage rate (qvl) corrected for temperature and barometric pressure; 5) pressurising time; 6) observed deformation of the ductwork during the test; k) the calculated values of: 1) air leakage factor (f); 2) air leakage limit (fmax