BS EN 12953-6-2011 Shell boilers Requirements for equipment for the boiler《锅壳式锅炉 锅炉用设备的要求》.pdf

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1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 12953-6:2011Shell BoilersPart 6: Requirements for equipment for theboilerBS EN 12953-6:2011 BRITISH STANDARDNational forewordThis British Standard is the UK implementation

2、of EN 12953-6:2011.It supersedes BS EN 12953-6:2002 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PVE/2, Water Tube And Shell Boilers.A list of organizations represented on this committee can beobtained on request to its secretary.This publication doe

3、s not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2011ISBN 978 0 580 64618 8ICS 23.020.01; 23.060.30; 27.060.30Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published u

4、nder the authority of theStandards Policy and Strategy Committee on 30 April 2011.Amendments issued since publicationDate Text affectedBS EN 12953-6:2011EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12953-6 February 2011 ICS 27.060.30 Supersedes EN 12953-6:2002English Version Shell Boilers -

5、Part 6: Requirements for equipment for the boiler Chaudires tube de fume - Partie 6: Exigences pour lquipement de la chaudire Growasserraumkessel - Teil 6: Anforderungen an die Ausrstung fr den Kessel This European Standard was approved by CEN on 1 January 2011. CEN members are bound to comply with

6、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 to the CEN-CENELEC Managem

7、ent 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-CENELEC Management Centre has the same statu

8、s as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,

9、 Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2011 CEN All rights of exploitation in any form and by any means rese

10、rved worldwide for CEN national Members. Ref. No. EN 12953-6:2011: EBS EN 12953-6:2011EN 12953-6:2011 (E) 2 Contents Page Foreword 31 Scope 52 Normative references 53 Terms and definitions . 54 General requirements for steam boilers and hot water boilers 84.1 Safeguards (safety valves) against exces

11、sive pressure . 84.2 Materials for valves, fittings, flanges and bolting 84.3 Protective systems 84.4 Heat supply . 84.5 Flue-gas heated economizers 104.6 Drain and blowdown devices . 104.7 Water quality 104.8 Water quality protection 105 Special requirements for steam boilers 125.1 Water level indi

12、cation 125.2 Steam pressure and temperature indication 145.3 Valves for connections . 155.4 Feed water supply 155.5 Feed water control . 155.6 Limiting devices . 165.7 Electrically heated steam boilers . 166 Special requirements for hot water boilers . 166.1 Hot water generating systems (for example

13、 see Annex A) 166.2 Expansion and feed lines for open vented systems 176.3 Water supply 186.4 Water level indication 186.5 Limiting devices . 196.6 Vent valves . 206.7 Pressure and temperature indication 206.8 Pressure controller 206.9 Discharge from safety valves . 216.10 Electrically heated hot wa

14、ter boilers . 216.11 Parallel mode of operation of hot water boilers . 217 Operational aspects including maintenance and testing 218 Alarms and monitoring from the boiler plant . 22Annex A (informative) Examples of steam and hot water boiler systems. 23Annex B (normative) Dimensioning of expansion s

15、pace 37Annex C (informative) Aspects of boiler operation . 40Annex D (informative) Drain and blowdown devices . 45Annex E (informative) Alarms and monitoring from the boiler plant . 47Annex F (informative) Significant technical changes between this European Standard and the previous edition . 50Anne

16、x ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC 51Bibliography 52BS EN 12953-6:2011EN 12953-6:2011 (E) 3 Foreword This document (EN 12953-6:2011) has been prepared by Technical Committee CEN/TC 269 “Shell and water-tube boilers”,

17、 the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2011, and conflicting national standards shall be withdrawn at the latest by August 2011. Attention

18、 is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 12953-6:2002. This document has been prepared under a mandate given

19、 to CEN by the European Commission and the European 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. Annex F provides details of significant technical changes b

20、etween this European Standard and the previous edition. The European Standard EN 12953 concerning shell boilers consists of the following parts: Part 1: General Part 2: Materials for pressure parts of boilers and accessories Part 3: Design and calculation for pressure parts Part 4: Workmanship and c

21、onstruction 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 boiler Part 7: Requirements for firing systems for liquid and gaseous fuels for the boiler Part 8: Requirements for

22、 safeguards against excessive pressure Part 9: Requirements for limiting devices of the boiler and accessories Part 10: Requirements for boiler feedwater and boiler water quality Part 11: Acceptance tests Part 12: Requirements for firing systems for solid fuels for the boiler Part 13: Operating inst

23、ructions CR 12953-14: Guidelines for the involvement of an inspection body independent of the manufacturer. BS EN 12953-6:2011EN 12953-6:2011 (E) 4 Although these parts can be obtained separately, it should be recognized that the parts are inter-dependent. As such, the design and manufacture of shel

24、l boilers requires the application of more than one part in order for the requirements of the standard to be satisfactorily fulfilled. For any questions arising when using these standards the Boiler Helpdesk of CEN/TC 269 may be contacted: http:/www.boiler-helpdesk.din.de According to the CEN/CENELE

25、C Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

26、 Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. BS EN 12953-6:2011EN 12953-6:2011 (E) 5 1 Scope This part of this European Standard specifies the minimum requirements for safety related equipment for shell boilers

27、 as defined in EN 12953-1, to ensure the boiler operates within the allowable limits (pressure, temperature, etc.) and if the limits are exceeded the energy supply shall be interrupted and locked out without manual (human) intervention at the boiler. NOTE 1 The maximum time of operation without manu

28、al (human) intervention should be defined for each boiler system. NOTE 2 Annex C (informative) gives recommendations of operation and testing of the boiler system with a maximum time of operation without manual (human) intervention of 72 hours. 2 Normative references The following referenced documen

29、ts are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12953-1:2002, Shell boilers Part 1: General EN 12953-2:2002, Shell bo

30、ilers Part 2: Materials for pressure parts of boilers and accessories EN 12953-7:2002, Shell boilers Part 7: Requirements for firing systems for liquid and gaseous fuels for the boilers EN 12953-8:2001, Shell boilers Part 8: Requirements for safeguards against excessive pressure EN 12953-9:2007, She

31、ll boilers Part 9: Requirements for limiting devices of the boiler and accessories EN 12953-10:2003, Shell boilers Part 10: Requirements for feedwater and boiler water quality EN 12953-12:2003, Shell boilers Part 12: Requirements for grate firing systems for solid fuels for the boiler EN 50156-1:200

32、4, Electrical equipment for furnaces and ancillary equipment Part 1: Requirements for application design and installation 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12953-1:2002 and the following apply. 3.1 controls devices used for maintaining t

33、he variable to be controlled (pressure, temperature, etc.) at a specific value (set point) 3.2 limiter limiting device that, on reaching a fixed value (pressure, temperature, etc.) is used to interrupt and lock-out the energy supply and requires manual unlocking before restart limiting device requir

34、es: measuring or detection function, and BS EN 12953-6:2011EN 12953-6:2011 (E) 6 activation function for correction, or shutdown, or shutdown and lockout, and which is used to carry out safety related functions as defined in the Pressure Equipment Directive “PED“ 97/23/EC 1, either on its own or as

35、part of a protective system (e.g. sensors, limiters, etc.) (see also Figure 1) NOTE 1 If this is achieved by multi channel systems, then all items or limiters for safety purposes are included within the protective system. NOTE 2 Manual resetting can be realised as a part of the limiter or as a part

36、of the safety logic. This will be achieved by the responsible operator taking into account of the physical situation. Figure 1 Protective devices and safety accessories according to PED 97/23/EC 3.3 independent ability to function as required without dependence upon other equipment 3.4 lock-out safe

37、ty shut-down condition of the protective system, 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 3.5 functional check testing of the safety device to ensure it performs its intended function 3.6 electrically

38、 heated steam boilers steam boilers in which water is heated by an electric current flowing between electrodes or by immersion heaters 3.7 electrically heated hot water boilers hot water boilers in which water is heated by an electric current flowing between electrodes or by immersion heaters 3.8 ex

39、pansion vessels containers to compensate for temperature dependent changes in water volume closed expansion vessels are pressurised open expansion vessels are vented to atmospheric pressure and are not pressurised BS EN 12953-6:2011EN 12953-6:2011 (E) 7 3.9 allowable heat output maximum heat output

40、(water mass flow times the difference between outlet and inlet enthalpy) that can be generated during continuous operation and at which hot water boilers can be operated 3.10 allowable flow temperature highest temperature, measured at the outlet branch at which the hot water boiler can be operated (

41、see 6.5.2.3) 3.11 maximum continuous rating (MCR) maximum continuous steam output that can be generated during continuous operation taking the specified steam condition into consideration 3.12 internal steam cushion steam filled space located within the steam boiler to accommodate changes in volume

42、3.13 external steam cushion steam filled space located outside the steam boiler to accommodate changes in volume 3.14 gas cushion gas-filled space to accommodate changes in volume 3.15 effective heat transfer 3.15.1 for a hot water boiler, the heat supply is on and flow of water is greater than or e

43、qual to a specified minimum value 3.15.2 for a steam boiler, the heat supply is on, the start-up or steam valve is open and the temperature is greater than the saturation temperature at ambient pressure 3.16 normal operation automatic operation, with all regulating circuits and controls (open loops/

44、closed loops) in automatic mode and with the set points and parameters valid for normal operation NOTE Normal operation also includes the automatic switching on and off of the assigned actuators (e.g. burner). 3.17 normal shut down controlled switch off of the boiler either operated manually or auto

45、matically 3.18 make-up water water which compensates for losses of water and steam from the system 3.19 feedwater mixture of returned condensate and/or make up water supplied to the boiler inlet BS EN 12953-6:2011EN 12953-6:2011 (E) 8 3.20 pressurization equipment external system for keeping the hot

46、 water system pressure within the required pressure limits NOTE In order to prevent corrosion caused by oxygen infiltration, systems that prevent the system water being in direct contact with air should be preferred. 3.21 boiler attendant boiler operator skilled person appointed for operating the bo

47、iler plant 4 General requirements for steam boilers and hot water boilers 4.1 Safeguards (safety valves) against excessive pressure Each steam boiler and hot water boiler, except open vented hot water boiler, shall be equipped with safeguards (safety valves) against excessive pressure in accordance

48、with EN 12953-8. Superheaters and economizers shall be protected in accordance with EN 12953-8. Where a superheater or an economizer can be isolated a pressure gauge connection shall be provided. 4.2 Materials for valves, fittings, flanges and bolting The conditions and requirements to select the ma

49、terial shall be in accordance with EN 12953-2. 4.3 Protective systems 4.3.1 All limiters and their installation shall be designed in accordance with EN 12953-9. The protective systems shall be in accordance with EN 50156-1. 4.3.2 The application design and installation of the electrical safety circuit as well as the electrical and control equipment for the heat supp