1、BRITISH STANDARDBS EN 88-2:2007Pressure regulators and associated safety devices for gas appliances Part 2: Pressure regulators for inlet pressures above 500 mbar up to and including 5 barThe European Standard EN 88-2:2007 has the status of a British StandardICS 23.060.40g49g50g3g38g50g51g60g44g49g4
2、2g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 88-2:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 Dece
3、mber 2007 BSI 2007ISBN 978 0 580 54317 3National forewordThis British Standard is the UK implementation of EN 88-2:2007.The UK participation in its preparation was entrusted by Technical Committee GSE/22, Safety and control devices for gas and oil burners and gas burning appliances, to Subcommittee
4、GSE/22/19, Pneumatic air/gas ratio controls and governors.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compl
5、iance with a British Standard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 88-2November 2007ICS 23.060.40English VersionPressure regulators and associated safety devices for gasappliances - Pa
6、rt 2: Pressure regulators for inlet pressuresabove 500 mbar up to and including 5 barRgulateurs de pression et dispositifs de scurit associspour appareils gaz - Partie 2: Rgulateurs de pressionpour pression amont suprieure 500 mbar et infrieure ougale 5 barDruckregler und zugehrige Sicherheitseinric
7、htungen frGasgerte - Teil 2: Druckregler fr Eingangsdrcke ber500 mbar bis einschlielich 5 barThis European Standard was approved by CEN on 8 May 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status o
8、f a national standard without any alteration. Up-to-date lists 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 versi
9、on in any other language made by translationunder the responsibility 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, Denmar
10、k, 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.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEU
11、ROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 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 88-2:2007: EEN 88-2:2007 (E) 2 Contents Page Foreword. 4 Introduction 5 1 Scope 6 2 Normative ref
12、erences . 6 3 Terms and definitions. 7 3.1 Pressure regulator 7 3.2 Components 7 3.3 Safety shut-off devices. 9 3.4 Control variables. 10 3.4.1 Reference values. 10 3.4.2 Variables in the controlling process. 11 3.4.3 Possible values of all variables . 11 3.4.4 Terms pertinent to the controlled vari
13、able. 12 3.5 Operating features in stable conditions . 12 3.6 Features pertinent to accuracy 14 3.7 Features pertinent to lock-up behaviour 15 3.8 Further functional terminology 16 3.8.1 Pressures pertinent to design of gas pressure regulator. 16 3.8.2 nominal pressure 17 3.8.3 operating temperature
14、 range temperature range at which the pressure regulator components and fixtures are capable of operating continuously. 17 4 Classification. 17 5 Units of measurement and test conditions 17 5.1 Units of measurement 17 5.2 Test conditions 17 6 Construction requirements 18 6.1 General. 18 6.2 Construc
15、tion 18 6.2.1 General. 18 6.2.2 Breather holes . 18 6.2.3 External visual Indication of the position of the closure member. 18 6.2.4 Parts transmitting actuating forces 19 6.2.5 Pressure adjustment. 19 6.3 Materials. 19 6.3.1 General. 19 6.3.2 Springs. 19 6.3.3 Requirements for elastomers (including
16、 vulcanized rubbers). 19 6.4 Gas connections . 19 6.4.1 General. 19 6.4.2 Connection sizes. 19 6.4.3 Threads 20 6.4.4 Pressure test nipples (applicable only for outlet connections operating at 500 mbar) 20 7 Performance requirements 20 7.1 General. 20 7.2 Strength of housings 20 7.2.1 Requirement 20
17、 7.2.2 Performance test. 21 7.3 External and internal leak tightness . 21 EN 88-2:2007 (E) 3 7.4 Torsion and bending. 21 7.5 Control classification 21 7.5.1 General. 21 7.5.2 Control classifications for pressure regulators. 21 7.5.3 Safety shut-off device accuracy group for over-pressure 22 7.6 Safe
18、ty devices . 22 7.6.1 Over-pressure safety shut-off device . 22 7.6.2 Under-pressure safety shut-off devices . 23 7.6.3 Bypass 23 7.6.4 Response time. 23 7.7 Durability of performance 23 7.7.1 Pressure regulator 23 7.7.2 Safety slam-shut device . 23 8 Marking, installation and operating instructions
19、. 24 8.1 Marking 24 8.2 Installation, operating and servicing instructions. 24 8.3 Warning notice 25 Annex A (informative) Main components for direct acting and pilot controlled pressure regulators. 26 A.1 Main components of a pressure regulator . 26 A.2 Main components of a gas safety shut-off devi
20、ce. 27 Annex B (informative) Use of ISO 7-1 and EN ISO 228-1 threads for gas connections (see 6.4.3) . 29 Annex C (normative) Performance test methods 30 C.1 General. 30 C.2 Apparatus and test rig 30 C.3 Performance tests under stable conditions. 32 C.3.1 General. 32 C.3.2 Determination of a perform
21、ance curve. 34 C.3.3 Determination of the lock-up pressure. 35 C.3.4 Regulator accuracy class. 36 C.4 Safety shut-off device accuracy group. 37 C.4.1 General conditions and apparatus 37 C.4.2 Test at ambient temperature 39 C.4.3 Test at the limit temperatures between 0 C and 60 C. 39 C.4.4 Verificat
22、ion of the upper limit of the highest set range 40 C.4.5 Response time. 40 C.5 Durability of performance 41 C.5.1 General. 41 C.5.2 Pressure regulator 41 C.5.3 Safety shut-off devices. 42 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directiv
23、e 90/396/EEC. 43 Bibliography . 45 EN 88-2:2007 (E) 4 Foreword This document (EN 88-2:2007) has been prepared by Technical Committee CEN/TC 58 “Safety and control devices for gas-burners and gas-burning appliances”, the secretariat of which is held by BSI. This European Standard shall be given the s
24、tatus of a national standard, either by publication of an identical text or by endorsement, at the latest by May 2008, and conflicting national standards shall be withdrawn at the latest by May 2008. This document has been prepared under a mandate given to CEN by the European Commission and the Euro
25、pean Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. EN 88 consists of the following parts under the general title “Pressure regulators and associated safety d
26、evices for gas appliances”: Part 1: Pressure regulators for inlet pressures up to and including 500 mbar; Part 2: Pressure regulators for inlet pressures above 500 mbar up to and including 5 bar. This European Standard should be used in conjunction with EN 13611 Safety and control devices for gas bu
27、rners and gas burning appliances General requirements. SIL classification according to EN 61508 cannot automatically be claimed based upon compliance with this standard. Pressure regulators with SIL classification do not meet automatically the requirements of this standard. According to the CEN/CENE
28、LEC 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, Lithuania, Luxemb
29、ourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 88-2:2007 (E) 5 Introduction This standard is a particular standard for Pressure Regulators for gas-burners and gas-burning appliances which cites EN 13611 Safety and co
30、ntrol devices for gas burners and gas-burning appliances - General requirements wherever possible. This standard supplements or modifies the corresponding clauses of EN 13611. The construction and performance requirements are as far as applicable in total conformity with EN 13611. EN 88-2:2007 (E) 6
31、 1 Scope This European Standard specifies the safety, construction and performance requirements for pressure regulators (hereafter referred to as regulators) intended for use with gas burners and gas-burning appliances using fuel gases of the 1st, 2ndand 3rdfamilies. This European Standard covers ty
32、pe testing only. It also provides additional information for the purchaser and user. This European Standard is applicable to regulators that may be tested independently of gas burners and gas-burning appliances, which have a declared working pressure from above 500 mbar up to and including 5 bar. Th
33、is European Standard is also applicable to regulators incorporating safety devices. NOTE 1 For safety accessories and pressure accessories, the requirements of EN 13611:2007, Annex F also apply. NOTE 2 Regulators conforming to EN 88-2 fulfil also the requirements of EN 88-1. Regulators intended to b
34、e used on pipe work installations for third family gases are also covered by EN 13785 and EN 13786. This European Standard is not applicable to: a) pressure regulators that are connected directly to mains pipe-work or to a container that maintains a standard distribution pressure; b) pressure regula
35、tors which use electrical auxiliary energy. 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 ame
36、ndments) applies. EN 88-1:2007, Pressure regulators and associated safety devices for gas appliances Part 1: Pressure regulators for inlet pressures up to and including 500 mbar EN 549, Rubber materials for seals and diaphragms for gas appliances and gas equipment EN 682, Elastomeric seals Materials
37、 requirements for seals used in pipes and fittings carrying gas and hydrocarbon fluids EN 13611:2007, Safety and control devices for gas burners and gas burning appliances General requirements EN 13787, Elastomers for gas pressure regulators and associated safety devices for inlet pressures up to 10
38、0 bar EN 60534-1:2005, Industrial-process control valves Part 1: Control valve terminology and general considerations (IEC 60534-1:2005) EN 60534-2-3, Industrial-process control valves Part 2-3: Flow capacity Test procedures (IEC 60534-2-3:1997) EN 88-2:2007 (E) 7 EN ISO 228-1, Pipe threads where pr
39、essure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation (ISO 228-1:2000) EN ISO 6708, Pipework components Definition and selection of DN (nominal size) (ISO 6708:1995) ISO 7-1, Pipe threads where pressure tight joints are made on the threads Part 1: Designation
40、, dimensions and tolerances ISO 3419, Non-alloy and alloy steel butt-welding fittings 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13611:2007, EN 60534-1:2005 and the following apply. 3.1 Pressure regulator 3.1.1 pressure regulator device that main
41、tains the outlet pressure constant independent of the variations in inlet pressure and/or flow rate within defined limits 3.1.2 nominal inlet diameter nominal size DN of the inlet connection in accordance with EN ISO 6708 3.1.3 nominal outlet diameter nominal size DN of the outlet connection in acco
42、rdance with EN ISO 6708 3.2 Components NOTE The main components of a pressure regulator and a safety shut-off device are shown in Annex A. 3.2.1 control member movable part of the pressure regulator that is positioned in the flow path to restrict the flow through the pressure regulator NOTE A contro
43、l member may be a plug, ball, disk, vane, gate, diaphragm, etc. 3.2.2 body part of the pressure regulator that is the main pressure containing envelope 3.2.3 valve seat corresponding sealing surfaces within a pressure regulator, or SSD that make full contact only when the pressure regulator or SSD i
44、s in the closed position 3.2.4 seat ring replaceable component of a regulator valve seat assembly EN 88-2:2007 (E) 8 3.2.5 actuator device or mechanism which changes the signal from the controller into a corresponding movement controlling the position of the control member 3.2.6 casing of actuator h
45、ousing of the actuator NOTE There may be two chambers under pressure within it. When the pressure in each chamber is different from atmospheric pressure, the chamber at the higher pressure is termed the “motorization chamber“ 3.2.7 controller device that controls the regulator NOTE It includes: sett
46、ing element, normally a spring, to obtain the set value of the controlled variable; detector element, normally a diaphragm, for the controlled variable. 3.2.8 pilot controller device that controls the regulator NOTE It includes: setting element to obtain the set value of the controlled variable; det
47、ector element for the controlled variable; unit which compares the set value of the controlled variable with its feedback value; system which provides the motorization energy for the actuator. 3.2.9 main diaphragm device that detects the controlled variable feedback pressure and provides the force t
48、o position the valve 3.2.10 pressure containing parts parts where failure would result in release of gas to the atmosphere NOTE Such parts comprise bodies, control member, bonnets, the casing of the actuator, blind flanges and pipes for process and sensing lines. 3.2.11 inner metallic partition wall
49、 metallic wall that divides internal chambers which have differing operating pressures 3.2.12 process and sensing line line that connects impulse points to the pressure regulator NOTE Sensing and process lines may be integrated into the pressure regulator or external to the pressure regulator. Those lines with no internal flow are termed “sensing lines“; those with internal flow are termed “process lines“. EN 88-2:2007 (E) 9 3.2.13 breather line line between the controller and/or pilot regulator and atmosphere which equ
