1、July 2009DEUTSCHE NORM English price group 31No part of this standard may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.060.40!$Xt“1538192www.
2、din.deDDIN EN 334Gas pressure regulators for inlet pressures up to 100 bar (includesAmendment A1:2009)English version of DIN EN 334:2009-07Gas-Druckregelgerte fr Eingangsdrcke bis 100 bar (enthlt nderung A1:2009)Englische Fassung DIN EN 334:2009-07SupersedesDIN EN 334:2005-06www.beuth.deDocument com
3、prises pages108DIN EN 334:2009-07 Start of validity This standard takes effect on 1 July 2009. National foreword This standard includes safety requirements. This standard has been prepared by Technical Committee CEN/TC 235 “Gas pressure regulators and associated safety devices for use in gas transmi
4、ssion and distribution” (Secretariat: UNI, Italy). The responsible German body involved in its preparation was the Normenausschuss Gastechnik (Gas Technology Standards Committee). This standard has been included in the body of Codes of practice for gas issued by the DVGW Deutscher Verein des Gas- un
5、d Wasserfaches e.V. (German Association of Gas and Water Engineers). This standard has been harmonized in all key points with the essential requirements of the Pressure Equipment Directive, with the exception of the external resistance to environmental conditions where corrosion occurs. When operati
6、ng gas pressure regulators as in this standard in installations conforming to the codes of practice for gas issued by the DVGW Deutscher Verein des Gas- und Wasserfaches e.V. (German Association of Gas and Water Engineers), the specifications of DVGW Arbeitsblatt G 491 shall be taken into account. A
7、s regards the calculation of volumetric flow rates for sizing purposes, only those methods specified in 6.2.1 and 6.2.3 (except for the limitations given in the fifth paragraph above) are to be used, whereby the following definition of KGapplies: KGrepresents the gas flow rate at an absolute inlet p
8、ressure of 2 bar at an absolute outlet pressure of 1 bar at a gas inlet temperature of 15 C (288,15 K) at a gas standard density of 0,83 kg/m3 KGis expressed in m3/(h bar). Amendments This standard differs from DIN EN 334:2005-06 as follows: a) The harmonized part of the standard now covers differen
9、tial strength gas pressure regulators and various different combinations of pressure regulators and safety devices, and no longer covers regulators incorporated into pressure-regulating devices in service lines. b) Clause 3 “Terms and definitions” has been partially reorganized. c) A glossary listin
10、g important terms in German, English and French has been added in an annex. Previous editions DIN EN 334: 1999-07, 2001-11, 2005-06 2 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 334:2005+A1 January 2009 ICS 23.060.40 Supersedes EN 334:2005English Version Gas pressure regulators for inlet pr
11、essures up to 100 bar Appareils de rgulation de pression de gaz (rgulateurs) pour des pressions amont jusqu 100 bar Gas-Druckregelgerte fr Eingangsdrcke bis 100 bar This European Standard was approved by CEN on 23 December 2004 and includes Amendment 1 approved by CEN on 8 December 2008.CEN members
12、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 t
13、o 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 translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the s
14、ame 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,
15、 Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2009 CEN All rights of exploitation in any form and by any means re
16、served worldwide for CEN national Members. Ref. No. EN 334:2005+A1:2009: E2 Contents page Foreword 51 Scope 62 Normative references 73 Terms, definitions and symbols . 93.1 !General terms and definitions of types of gas pressure regulators“ 93.2 !Terms and definitions of components of gas pressure r
17、egulators“ . 123.3 !Terms, symbols and definitions of components of functional performance“ . 143.3.7 !Terms, symbols and definitions of functional performance“ 163.4 !Terms, symbols and definitions related to design and tests“ . 204 Construction requirements . 224.1 Basic requirements . 224.1.1 Gen
18、eral 224.1.2 !Gas pressure regulators with associated safety devices 234.1.3 End connections 254.1.4 Flange ratings 254.1.5 Nominal sizes and face-to-face dimensions . 254.1.6 Sealing of the adjusting device 294.1.7 !Springs 294.1.8 Replaceable parts that may be affected by erosion or abrasion 294.2
19、 Materials . 294.2.1 Requirements for metallic materials 294.2.2 Requirements for elastomers (including vulcanized rubbers) . 344.2.3 Requirements for non metallic materials different from those in 4.2.2 . 344.3 Strength of housings . 35 ! 354.3.1 Body and its inner metallic partition walls“ 354.3.2
20、 Flanges . 354.3.3 !Other pressure containing parts 354.3.4 Inner metallic partition walls 374.3.5 Minimum values of safety factor 374.3.6 Welded joint coefficient 385 Functional requirements . 385.1 General 385.1.1 Mounting position 385.1.2 Sound emission . 385.2 Shell strength, external tightness
21、and internal sealing . 395.2.1 Shell strength . 395.2.2 External tightness 405.2.3 Internal sealing 405.3 Control classifications 405.3.1 Accuracy under stable conditions . 405.3.2 Lock-up behaviour . 405.3.3 Stable conditions . 415.4 Final visual inspection 415.5 Fail-close conditions . 426 Gas pre
22、ssure regulator sizing 426.1 Flow behaviour 42EN 334:2005+A1:2009 (E) DIN EN 334:2009-07 3 6.2 Sizing equations for the calculation of volumetric flow rates of a gas pressure regulator with its control member in its mechanically fully open position . 436.2.1 Normal calculations 436.2.2 Practical cal
23、culations 436.2.3 Simplified calculations 436.3 Calculation of the maximum accuracy flow rate 446.4 Inherent flow characteristics 446.5 Calculation of volumetric flow rates for partially open gas pressure regulators . 446.6 Flow coefficient . 447 Testing 457.1 General . 457.2 Tests . 457.3 Type test
24、 . 467.4 Selection of test samples . 477.5 Routine tests 477.6 Production surveillance 477.7 Test and verification methods . 477.7.1 Dimensional check and visual inspection 477.7.2 Materials check 477.7.3 Verification of the strength of pressure containing parts and inner metallic partition walls 48
25、7.7.4 Shell and inner metallic partition walls strength test 497.7.5 Alternative shell and inner metallic partition walls strength test . 507.7.6 External tightness test 507.7.7 Functional tests . 517.7.8 Final visual inspection 648 Documentation 648.1 Documentation related to type test . 648.1.1 Do
26、cumentation required prior to type test . 648.1.2 Test report 648.2 Documentation related to the routine tests 648.2.1 Documentation provided at the request of the customer . 648.2.2 Documentation provided with the regulator . 658.3 Documentation related to production surveillance in accordance with
27、 7.6 658.3.1 Documentation to be available for production surveillance . 658.3.2 Production surveillance report 669 Marking . 669.1 General requirements . 669.2 Markings for the various connections 679.3 Marking of integrated safety devices 67Annex A (informative) Alternative methods for the determi
28、nation of the accuracy class, the lock-up pressure class, the maximum accuracy flow rate, the flow coefficients and the verification of the hysteresis band 68A.1 General . 68A.2 Test methods . 68A.2.1 Direct acting gas pressure regulator . 68A.2.2 Pilot controlled gas pressure regulators 69A.3 Deter
29、mination of flow coefficients for larger capacity regulators . 70Annex B (informative) Inspection certificate 77Annex C (informative) Acceptance test 79Annex D (informative) Compliance evaluation)80D.1 General . 80D.2 Introduction 80D.3 Procedure . 80D.4 Manufacturers compliance evaluation . 81D.5 I
30、ssue of the certificate of compliance . 81EN 334:2005+A1:2009 (E) DIN EN 334:2009-07 4 Annex E (informative) !Seat leakage (alternative requirement)“ 82Annex F (normative) Creep (venting) relief device 83F.1 General 83F.2 Terms and definitions . 83F.3 Requirements . 83F.3.1 Construction 83F.3.2 Func
31、tional requirements . 83F.4 Testing 83F.5 Type test . 84F.6 Routine tests 84F.7 Documentation . 84F.8 Marking . 84Annex G (informative) Order specification . 85G.1 General 85G.2 Minimum specifications 85G.2.1 Details of construction 85G.2.2 Dimensions. 85G.2.3 Performance . 85G.3 Optional specificat
32、ions . 86Annex H (normative) Materials 88H.1 Steel materials for pressure containing parts and inner metallic partition walls . 88H.2 Metallic materials different from steel materials for pressure containing parts and inner metallic partition walls 94H.3 Materials for fixtures, integral process and
33、sensing lines, connectors and fasteners 99Annex I (informative) !Glossary . 102Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC 104Bibliography 106EN 334:2005+A1:2009 (E) DIN EN 334:2009-07 5 Foreword This document (EN 334:200
34、5+A1:2009) has been prepared by Technical Committee CEN/TC 235 “Gas pressure regulators and associated safety devices for use in gas transmission and distribution”, the secretariat of which is held by UNI. This European Standard shall be given the status of a national standard, either by publication
35、 of an identical text or by endorsement, at the latest by July 2009, and conflicting national standards shall be withdrawn at the latest by July 2009. This document includes Amendment 1, approved by CEN on 2008-12-08. This document supersedes !EN 334:2005“. The start and finish of text introduced or
36、 altered by amendment is indicated in the text by tags ! “. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive 97/23/EC. For relationship with EU Directive 97/23/EC, see
37、informative Annex ZA, which is an integral part of this document. Gas pressure regulators dealt with in this document are standard gas pressure regulators and, when used in pressure regulating stations complying with EN 12186 or EN 12279, they are considered as standard pressure equipment in accorda
38、nce with Clause 3.1 of Art. 1 of Pressure Equipment Directive 97/23/EC (PED). For standard gas pressure regulators used in pressure regulating stations complying with EN 12186 or EN 12279, Table ZA.1 given in Annex ZA includes all applicable Essential Requirements given in Annex I of PED, !except th
39、e external corrosion resistance in case of environmental conditions where corrosion is likely to occur“. The normative Annex H of this document lists some suitable materials for pressure containing parts, inner metallic partition walls, fasteners and connectors. Other materials may be used when comp
40、lying with the restrictions given in Table 5. !deleted text“ !Continued“ integrity of gas pressure regulators is assured by periodic functional checks. For periodic functional checks it is common to refer to national regulations/standards where existing or users/manufacturers practices. According to
41、 the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lith
42、uania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 334:2005+A1:2009 (E) DIN EN 334:2009-07 6 1 Scope !This document specifies constructional, functional, testing and marking requirements, sizing and document
43、ation of gas pressure regulators used in the pressure regulating stations in accordance with EN 12186 or EN 12279:“ for inlet pressures up to 100 bar and nominal diameters up to DN 400; for an operating temperature range from -20 C to +60 C, which operate with fuel gases of the 1stand 2ndfamily in a
44、ccordance with EN 437 in transmission and distribution networks and also in commercial and industrial installations. “Gas pressure regulators“ hereafter will be called “regulators“ except in the titles. !For standard regulators when used in pressure regulating stations complying with EN 12186 or EN
45、12279, Annex ZA lists all applicable Essential Requirements except the external corrosion resistance in case of environmental conditions where corrosion is likely to occur.“ !This document considers the following classes/types of regulators:“ class 1: operating temperature range from -10 C to 60 C;
46、class 2: operating temperature range from -20 C to 60 C; ! type IS: (integral strength type); type DS: (differential strength type).“ This document applies to regulators which use the pipeline gas as a source of control energy unassisted by any external power source. The regulator may incorporate a
47、creep (venting) relief device, complying with the requirements in Annex F. The regulators complying with the requirements of this document may be declared as “in compliance with EN 334“ and bear the marking “EN 334”. This document does not apply to: regulators upstream from/on/in domestic gas-consum
48、ing appliances which are installed downstream of domestic gas meters; ! regulators incorporated into pressure-regulating devices used in service lines1with volumetric flow rate 200 m3/h at normal conditions and inlet pressure 5 bar;“ regulators for which a specific document exists (e.g. EN 88, etc.); industrial process control valves in accordance with
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