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1、BRITISH STANDARD BS EN 12953-9:2007 Shell boilers Part 9: Requirements for limiting devices of the boiler and accessories The European Standard EN 12953-9:2007 has the status of a British Standard ICS 27.060.30 ? Licensed Copy: AUB User, na, Sun Sep 02 00:29:06 GMT+00:00 2007, Uncontrolled Copy, (c)
2、 BSI BS EN 12953-9:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007 ISBN 978 0 580 58655 2 National foreword This British Standard is the UK implementation of EN 12953-9:2007. The UK participation in its preparatio
3、n was entrusted to Technical Committee PVE/2, Water tube and shell boilers. 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 correc
4、t application. Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publication Amd. No. DateComments Licensed Copy: AUB User, na, Sun Sep 02 00:29:06 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN
5、12953-9 July 2007 ICS 27.060.30 English Version Shell boilers - Part 9: Requirements for limiting devices of the boiler and accessories Chaudires tubes de fume - Partie 9: Exigences pour les dispositifs de limitation de la chaudire et de ses accessoires Growasserraumkessel - Teil 9: Anforderungen an
6、 Begrenzungseinrichtungen an Kessel und Zubehr This European Standard was approved by CEN on 26 May 2007. CEN members 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 alteratio
7、n. Up-to-date lists and bibliographical references concerning such national standards 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 translat
8、ion 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 versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany,
9、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 STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Mana
10、gement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12953-9:2007: E Licensed Copy: AUB User, na, Sun Sep 02 00:29:06 GMT+00:00 2007, Uncontrolled Copy, (c) BSI EN 12953-9:2007 (E)
11、2 Contents Page Foreword4 1 Scope 6 2 Normative references6 3 Terms and definitions .7 4 Requirements for limiter .9 4.1 General9 4.2 Materials and design .9 4.3 Electrical equipment10 4.4 Fault assessment.10 4.5 Marking.12 5 Special requirements for water level limiters .14 5.1 Components.14 5.2 De
12、sign.14 5.3 Floating devices.15 5.4 Level electrode devices 15 5.5 Examination of functional capability.16 5.6 Fault detection .19 6 Special requirements for pressure limiters 19 6.1 Components.19 6.2 Additional fault assessment requirements.19 6.3 Design.19 6.4 Electrical equipment20 6.5 Examinatio
13、n of functional capability.20 6.6 Fault detection .22 7 Special requirements for temperature limiters.22 7.1 Components.22 7.2 Design.22 7.3 Electrical equipment24 7.4 Examination of functional capability.24 8 Special requirements for flow limiters.25 8.1 Components.25 8.2 Design.25 8.3 Electrical e
14、quipment25 8.4 Examination of functional capability.25 Annex A (informative) Limiting device26 Annex B (informative) Example of an examination plan.27 Annex C (informative) Marking of limiters29 Annex D (normative) Immunity against electrical and electromagnetic influences Requirements and testing.3
15、2 D.1 General32 D.2 Immunity against mains voltage variations32 D.3 Immunity against short-time voltage interruptions and reductions.32 D.4 Immunity against mains frequency changes33 D.5 Immunity against electrostatic discharge (ESD)33 D.6 Immunity against fast transient disturbance variables (burst
16、).33 D.7 Immunity against surges 34 D.8 Immunity against high-frequency electromagnetic fields.34 D.9 Immunity against conducted disturbances induced by high frequency fields.35 D.10 Immunity against power frequency magnetic fields35 Licensed Copy: AUB User, na, Sun Sep 02 00:29:06 GMT+00:00 2007, U
17、ncontrolled Copy, (c) BSI w w w . b z f x w . c o m EN 12953-9:2007 (E) 3 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC 36 Bibliography 37 Licensed Copy: AUB User, na, Sun Sep 02 00:29:06 GMT+00:00 2007, Uncontrolled Copy,
18、(c) BSI w w w . b z f x w . c o m EN 12953-9:2007 (E) 4 Foreword This document (EN 12953-9:2007) has been prepared by Technical Committee CEN/TC 269 “Shell and water-tube boilers”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, eithe
19、r by publication of an identical text or by endorsement, at the latest by January 2008 and conflicting national standards shall be withdrawn at the latest by January 2008. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association,
20、 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. The European Standard EN 12953 concerning shell boilers consists of the following Parts: Part 1: General Part 2: Materials for pressur
21、e parts of boilers and accessories Part 3: Design and calculation for pressure parts Part 4: Workmanship and construction of pressure parts of the boiler Part 5: Inspection during construction, documentation and marking of pressure parts of the boiler Part 6: Requirements for equipment for the boile
22、r Part 7: Requirements for firing systems for liquid and gaseous fuels for the boiler Part 8: Requirements for safeguards against excessive pressure Part 9: Requirements for limiting devices of the boiler and accessories Part 10: Requirements for feedwater and boiler water quality Part 11: Acceptanc
23、e tests Part 12: Requirements for grate firing systems for solid fuels for the boiler Part 13: Operating instructions CR 12953 Part 14: Guideline for the involvement of an inspection body independent of the manufacturer. Although these Parts may be obtained separately, it should be recognised that t
24、he Parts are interdependent. As such, the design and manufacture of shell boilers requires the application of more than one Part in order for the requirements of the European Standard to be satisfactorily fulfilled. According to the CEN/CENELEC Internal Regulations, the national standards organizati
25、ons 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, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania
26、, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. Licensed Copy: AUB User, na, Sun Sep 02 00:29:06 GMT+00:00 2007, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m EN 12953-9:2007 (E) 5 Introduction The types of limiters which shall be fitted to boilers are specified in EN 129
27、53-6 and the design of the safety systems are specified in EN 50156-1. A limiter (or limiting device) is one element of a shell boiler safety system. It comprises a sensor and monitoring elements to achieve the desired level of reliability. In order to provide the necessary safety function, for exam
28、ple, to cut off the heat supply to the boiler in the event of a low water fault, the limiter is connected to other elements in the safety system such as actuators and safety logic circuits. Licensed Copy: AUB User, na, Sun Sep 02 00:29:06 GMT+00:00 2007, Uncontrolled Copy, (c) BSI w w w . b z f x w
29、. c o m EN 12953-9:2007 (E) 6 1 Scope This European Standard specifies requirements for limiters (or limiting devices) which are incorporated into safety systems for shell boilers as defined in EN 12953-1. A limiter (or limiting device) can be either: a safety accessory as defined in the Pressure Eq
30、uipment Directive, Article 1, clause 2.1.3, and needs to include the safety logic and final actuator, or one element of a safety system, for example, a self-monitoring water level sensor used as part of a safety accessory as defined in the Pressure Equipment Directive, Article 1, clause 2.1.3. The o
31、verall boiler protection function needs to be provided in association with additional safety logic (where appropriate) and a final actuator. The design requirements and examination of functional capability for the limiters are covered in this European Standard. For an explanation of the extent of th
32、e limiter (or limiting device) see Figure A.1. 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
33、amendments) applies. EN 298:2003, Automatic gas burner control systems for gas burners and gas burning appliances with or without fans EN 50156-1:2004, Electrical equipment for furnaces and ancillary equipment Part 1: Requirements for application design and installation EN 60529:1991, Degrees of pro
34、tection provided by enclosures (IP code) (IEC 60529:1989) EN 60664-1:2003, Insulation coordination for equipment within low-voltage systems Part 1: Principles, requirements and tests (IEC 60664-1:1992 + A1:2000 + A2:2002) EN 60730-1:2000, Automatic electrical controls for household and similar use P
35、art 1: General requirements (IEC 60730-1:1999, modified) EN 61000-4-2:1995, Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques Section 2: Electrostatic discharge immunity test Basic EMC publication (IEC 61000-4-2:1995) EN 61000-4-3:2006, Electromagnetic compatibility (EMC
36、) Part 4-3: Testing and measurement techniques Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2006) EN 61000-4-4:2004, Electromagnetic compatibility (EMC) Part 4-4: Testing and measurement techniques Electrical fast transient/burst immunity test (IEC 61000-4-4:2004) EN
37、 61000-4-5:2006, Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques Section 5: Surge immunity test (IEC 61000-4-5:2005) EN 61000-4-6:1996, Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques Section 6: Immunity to conducted disturbances, induced
38、 by radio-frequency fields (IEC 61000-4-6:1996) EN 61000-4-8:1993, Electromagnetic compatibility (EMC) Part 4: Testing and measurement techniques Section 8: Power frequency magnetic field immunity test; basic EMC publication (IEC 61000-4-8:1993) Licensed Copy: AUB User, na, Sun Sep 02 00:29:06 GMT+0
39、0:00 2007, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m EN 12953-9:2007 (E) 7 EN 61000-4-11:2004, Electromagnetic compatibility (EMC) Part 4-11: Testing and measurement techniques Voltage dips, short interruptions and voltage variations immunity tests (IEC 61000-4-11:2004) EN 61000-6-2:2005,
40、 Electromagnetic compatibility (EMC) Part 6-2: Generic standards Immunity for industrial environments (IEC 61000-6-2:2005) EN 61508-3:2001, Functional safety of electrical/electronic/programmable electronic safety-related systems Part 3: Software requirements (IEC 61508-3:1998 + Corrigendum 1999) 3
41、Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 limiter limiting device that, on reaching a fixed value (e.g. pressure, temperature, flow, water level) is used to interrupt and lock-out the energy supply NOTE Limiting device comprises: a measur
42、ing or detection function and an activation function for correction, or shutdown, or shutdown and lockout, and which is used to carry out safety related functions as defined in the PED, on its own or as part of a safety (protective) system (e.g. sensors, limiters) (see also Figure 1). If this is ach
43、ieved by multi channel systems, then all items or limiters for safety purposes are included within the safety (protective) system Figure 1 Protective devices and safety accessories according to Directive 97/23/EC (PED) 3.2 actuating element component which produces changes in other electrical circui
44、ts or volume flows (e.g. fuel, air) as a result of the effect of changes in signal NOTE For example, a gas shut off valve is not an actuating element. 3.3 fail-safe limiter is fail-safe if it possesses the capability of remaining in a safe condition or transferring immediately to another safe condit
45、ion in the event of certain faults occurring Licensed Copy: AUB User, na, Sun Sep 02 00:29:06 GMT+00:00 2007, Uncontrolled Copy, (c) BSI w w w . b z f x w . c o m EN 12953-9:2007 (E) 8 3.4 self-monitoring regular and automatic determination that all chosen components of a safety system are capable o
46、f functioning as required 3.5 redundancy provision of more than one device or system which, in the event of a fault, will still be provided by the necessary facilities 3.6 diversity provision of different means of performing the required function, e.g. other physical principles or other ways of solv
47、ing the same problem 3.7 complex electronics assemblies which use electronic components with more than one functional output 3.8 safety shut-down process which is effected immediately following the detection of a fault within the limiter or caused by exceeding the threshold of the process value limi
48、t resulting in a defined state with deactivated terminals of the safety output(s) 3.9 lock-out safety shut-down condition of the limiter, such that a restart can only be accomplished by a manual reset of the limiter or by a manual reset of the safety logic and by no other means NOTE This will be ach
49、ieved by a competent operator taking account of the physical situation 3.10 sensor transducer which, on reaching a defined limit value, outputs a signal and/or cuts out and only reverses the output signal in the event of a specific change in the performance quantity (e.g. pressure, temperature, flow, level) NOTE Sensors are used for signalling or for triggering control processes Licensed Copy: AUB User, na, Sun Sep 02 00:2