1、BRITISH STANDARDBS EN 13831:2007Incorporating corrigendum April 2008Closed expansion vessels with built in diaphragm for installation in waterICS 91.140.10g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g5
2、5g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 13831:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2007 BSI 2008ISBN 978 0 580 62086 7National forewordThis British Standard is the UK implementation of EN 13831:
3、2007. It supersedes BS 4814:1990 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee RHE/7, Expansion vessels using an internal diaphragm.A list of organizations represented on this committee can be obtained on request to its secretary.This publication doe
4、s not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.Amendments/corrigenda issued since publicationDate Comments30 April 2008 Correction to supersession
5、detailsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13831August 2007ICS 91.140.10English VersionClosed expansion vessels with built in diaphragm for installationin waterVases dexpansion ferms avec membrane incorpore pourinstallation dans des systmes eauAusdehnungsgefe mit eingebauter Membrane f
6、r denEinbau in WassersystemenThis European Standard was approved by CEN on 26 July 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists
7、 and bibliographical references concerning such nationalstandards may be obtained on application to the CEN 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 translationunder the responsi
8、bility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland,
9、 Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart
10、, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13831:2007: EEN 13831:2007 (E) 2 Contents Page Foreword4 Introduction .5 1 Scope 6 2 Normative references 6 3 Terms and conditions .7 4 Symbols and units.9 5 M
11、aterials .10 5.1 General10 5.2 Materials proven by experience and current use.10 5.3 Fasteners 11 5.4 Non-pressurised parts 11 6 Design and calculation11 6.1 Design .11 6.1.1 Requirements pertaining to the diaphragm 11 6.1.2 Requirements pertaining to fresh water application11 6.1.3 Outside finish.1
12、1 6.1.4 Inspection openings11 6.1.5 Connections .12 6.1.6 Clenched joints 12 6.1.7 Volume tolerance of vessels 12 6.1.8 Fatigue 12 6.1.9 Loadings .13 6.2 Experimental design method13 6.2.1 General13 6.2.2 Preparations .13 6.2.3 Vessels with PS V 1 000 bar L 13 6.2.4 Vessels with 1 000 bar L 0,005 Di
13、(if this condition is not fulfilled, e has to be checked additionally for plastic buckling. See EN 134453 f) R DeBS EN 13831:2007EN 13831:2007 (E) 17 The required thickness e is the greater of the following values ( )fD,R,pei+=20750(6) p,zfRpe502 = (7) Figure 2 Torispherical end design (factor ) 6.3
14、.4.5 Ellipsoidal ends An ellipsoidal end is made on a truly ellipsoidal former. These rules apply only to ends for which 1,7 6,3 mm, (bois the basic gasket or joint seating width = w / 2 with the exception of the ring-joint for which bo = w / 8) mm d diameter of an opening mm dinozzle inside diamete
15、r mm denozzle outside diameter mm Diinside diameter of the cylindrical shell / pipe / opening to which the end is bolted mm C diameter of the bolt circle mm G mean diameter of gasket mm e minimum required wall thickness of the end mm BS EN 13831:2007EN 13831:2007 (E) 26 ebminimum required wall thick
16、ness of nozzle under internal pressure mm eominimum required wall thickness of end without opening mm e1minimum required wall thickness for the peripheral area of the end mm f nominal design stress of end material at temperature MPa fambnominal design stress of end material at room temperature MPa W
17、amb total tensile force of bolts for the gasket seating condition N k distance between centre lines of two adjacent openings mm m tightening coefficient of gasket (Table 1) ea,banalysis thickness of external section of a nozzle mm ea,banalysis thickness of the internal protrusion of a nozzle mm fbno
18、minal design stress at calculation temperature of the nozzle MPa l external length of a nozzle effective for reinforcement mm l internal length on a protruding nozzle effective for reinforcement mm w contact width of gasket, as limited by gasket width and flange facing mm Y2calculation coefficient o
19、f opening reinforcement y gasket seating pressure (Table 1) N/mm26.3.6.3 Unstayed flat circular bolted ends without openings 6.3.6.3.1 General These design rules relate to the following ends: gaskets entirely within the bolt circle (narrow-face); gaskets on both sides of the bolt circle (full-face).
20、 The ends may or may not be of uniform thickness. However the minimum required wall thickness has to be extended to the entire surface located inside the gasket. BS EN 13831:2007EN 13831:2007 (E) 27 6.3.6.3.2 Circular ends with gasket entirely within the bolt circle a) plane face c) tongue joint b)
21、raised face d) groove joint Figure 9 Bolted circular flat ends with gasket entirely within the bolt circle The minimum required wall thickness e for the end is the greater value calculated from Equations (41) and (42) respectively. For the gasket seating condition: ambambA3fGWG)(Ce= (41) For each pr
22、essure condition: ()fpGCmbGG,e += 2433102p(42)Wamb is given by the following equation: yGbW = amb (43) The minimum required wall thickness e1for the peripheral area end is given by Equation (41) or the following for each pressure condition whichever is greater. BS EN 13831:2007EN 13831:2007 (E) 28 (
23、)fpGCmbGe += 243p1 (44) 6.3.6.3.3 Circular ends with gasket on both sides of the bolt circle (full faced gasket flange) Figure 10 Bolted circular flat end with a gasket on both sides of the bolts The minimum required wall thickness for the end is given by the following equation: fpC,e = 410 (45) The minimum required wall thickness for the peripheral area of the end is given by: e1= 0,8 e (46) The reduced thickness of the flanged extension shall be limited to a crown area whose internal circumference is not smaller than 0,7 C. BS EN 13831:2007
