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1、BRITISH STANDARD BS EN 88-2:2007 Pressure regulators and associated safety devices for gas appliances Part 2: Pressure regulators for inlet pressures above 500 mbar up to and including 5 bar The European Standard EN 88-2:2007 has the status of a British Standard ICS 23.060.40 ? Licensed Copy: London
2、 South Bank University, London South Bank University, Wed Jan 02 02:00:11 GMT+00:00 2008, Uncontrolled Copy, (c) BSI BS EN 88-2:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2007 BSI 2007 ISBN 978 0 580 54317 3 National for
3、eword This 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 GSE/22/19, Pneumatic air/gas ratio controls and go
4、vernors. 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. Compliance with a British Standard cannot confer imm
5、unity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:00:11 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 88-2 November 2007 IC
6、S 23.060.40 English Version Pressure regulators and associated safety devices for gas appliances - Part 2: Pressure regulators for inlet pressures above 500 mbar up to and including 5 bar Rgulateurs de pression et dispositifs de scurit associs pour appareils gaz - Partie 2: Rgulateurs de pression po
7、ur pression amont suprieure 500 mbar et infrieure ou gale 5 bar Druckregler und zugehrige Sicherheitseinrichtungen fr Gasgerte - Teil 2: Druckregler fr Eingangsdrcke ber 500 mbar bis einschlielich 5 bar This European Standard was approved by CEN on 8 May 2007. CEN members are bound to comply with th
8、e 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 Management Centre
9、 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 same status as the official
10、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, Romania, Slovakia, Sloveni
11、a, 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 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN nat
12、ional Members. Ref. No. EN 88-2:2007: E Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:00:11 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EN 88-2:2007 (E) 2 Contents Page Foreword. 4 Introduction 5 1 Scope 6 2 Normative references . 6 3 Terms and definitions.
13、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 variable. 12 3.5 Operating features in sta
14、ble 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 range temperature range at which the p
15、ressure 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 Construction 18 6.2.1 General. 18 6.2.2 Breathe
16、r 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 vulcanized rubbers). 19 6.4 Gas connect
17、ions. 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 7.2.2 Performance test. 21 7.3 External
18、and internal leak tightness . 21 Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:00:11 GMT+00:00 2008, Uncontrolled Copy, (c) BSI 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
19、pressure regulators. 21 7.5.3 Safety shut-off device accuracy group for over-pressure 22 7.6 Safety 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 re
20、gulator 23 7.7.2 Safety slam-shut device. 23 8 Marking, installation and operating instructions. 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
21、 Main components of a pressure regulator. 26 A.2 Main components of a gas safety shut-off device. 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 Per
22、formance tests under stable conditions. 32 C.3.1 General. 32 C.3.2 Determination of a performance 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
23、 temperature 39 C.4.3 Test at the limit temperatures between 0 C and 60 C. 39 C.4.4 Verification 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 (informati
24、ve) Relationship between this European Standard and the Essential Requirements of EU Directive 90/396/EEC. 43 Bibliography . 45 Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:00:11 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EN 88-2:2007 (E) 4 Foreword This d
25、ocument (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 status of a national standard, either by publication of an identical t
26、ext 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 European Free Trade Association, and supports essential requirements of E
27、U 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 devices for gas appliances”: Part 1: Pressure regulators for inlet pre
28、ssures 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 burners and gas burning appliances General requirements. SIL classifica
29、tion 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/CENELEC Internal Regulations, the national standards organizations of the
30、 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, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia
31、, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:00:11 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EN 88-2:2007 (E) 5 Introduction This standard is a particular standard for Pressure Regulators for gas-
32、burners and gas-burning appliances which cites EN 13611 Safety and control 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 fa
33、r as applicable in total conformity with EN 13611. Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:00:11 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EN 88-2:2007 (E) 6 1 Scope This European Standard specifies the safety, construction and performance requiremen
34、ts for pressure regulators (hereafter referred to as regulators) intended for use with gas burners and gas-burning appliances using fuel gases of the 1st, 2nd and 3rd families. This European Standard covers type testing only. It also provides additional information for the purchaser and user. This E
35、uropean 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. This European Standard is also applicable to regulators incorporating safety devices. NOTE 1
36、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 be used on pipe work installations for third family gases are also covered by EN 13785 and E
37、N 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 regulators which use electrical auxiliary energy. 2 Normative references The following referenced
38、 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 88-1:2007, Pressure regulators and associated safety devices for gas a
39、ppliances 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 requirements for seals used in pipes and fittings carrying gas and hydrocarbon fluids EN 1
40、3611:2007, 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 100 bar EN 60534-1:2005, Industrial-process control valves Part 1: Control valve terminology
41、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) Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:00:11 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EN 88-2
42、:2007 (E) 7 EN ISO 228-1, Pipe threads where pressure-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 joi
43、nts are made on the threads Part 1: Designation, 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 reg
44、ulator 3.1.1 pressure regulator device that maintains 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
45、nominal size DN of the outlet connection in accordance 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 f
46、low through the pressure regulator NOTE A control 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 c
47、ontact only when the pressure regulator or SSD is in the closed position 3.2.4 seat ring replaceable component of a regulator valve seat assembly Licensed Copy: London South Bank University, London South Bank University, Wed Jan 02 02:00:11 GMT+00:00 2008, Uncontrolled Copy, (c) BSI EN 88-2:2007 (E)
48、 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 housing of the actuator NOTE There may be two chambers under pressure within it. When the pressure in each chamber
49、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: setting 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 val