1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationWater-tube boilers and auxiliary installationsPart 7: Requirements for equipment for the boilerBS EN 12952-7:2012National forewordThis British Standard is the UK implementation o
2、f EN 12952-7:2012. It supersedes BS EN 12952-7:2002, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PVE/2, Water Tube And Shell Boilers.A list of organizations represented on this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
3、does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2013.Published by BSI Standards Limited 2013.ISBN 978 0 580 67645 1 ICS 23.020.01; 27.040; 27.060.30Compliance with a British Standard cannot c
4、onfer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January 2013.Amendments issued since publicationAmd. No. Date Text affectedBRITISH STANDARDBS EN 12952-7:2012EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE
5、 NORM EN 12952-7 October 2012 ICS 27.040 Supersedes EN 12952-7:2002English Version Water-tube boilers and auxiliary installations - Part 7: Requirements for equipment for the boiler Chaudires tubes deau et installations auxiliaires - Partie7: Exigences pour lquipement de la chaudire Wasserrohrkessel
6、 und Anlagenkomponenten - Teil 7: Anforderungen an die Ausrstung fr den Kessel This European Standard was approved by CEN on 8 September 2012. 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 na
7、tional standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A v
8、ersion 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 status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus
9、, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingd
10、om. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12952-7:2012: EBS EN
11、 12952-7:2012EN 12952-7:2012 (E) 2 Contents Foreword 31 Scope 52 Normative references 53 Terms and definitions . 64 General requirements for steam boilers and hot water generators . 85 Special requirements for steam boilers 126 Special requirements for hot water generators 157 Additional requirement
12、s for plants without manual intervention . 208 Final inspection of the water tube boiler plant . 23Annex A (normative) Chemical recovery boilers (Black liquor recovery boilers) 24Annex B (informative) Aspects of boiler operation . 26Annex C (informative) Alarms and monitoring from the boiler plant .
13、 30Annex D (normative) Requirements for limiters based on analogue measurements 31Annex E (normative) Access to internal parts . 35Annex F (normative) Final inspection of the water tube boiler plant 38Annex G (informative) Drain and blowdown devices 39Annex H (informative) Significant technical chan
14、ges between this European Standard and the previous edition . 40Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC 41Bibliography 42BS EN 12952-7:2012EN 12952-7:2012 (E) 3 Foreword This document (EN 12952-7:2012) has been prepar
15、ed 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, either by publication of an identical text or by endorsement, at the latest by April 2013, and conflicting national s
16、tandards shall be withdrawn at the latest by April 2013. Attention 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 1
17、2952-7:2002. 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(s). For relationship with EU Directive 97/23/EC, see informative Annex ZA, which is an integral part of th
18、is document. Annex H provides details of significant technical changes between this European Standard and the previous edition. The European Standard series EN 12952 concerning water-tube boilers and auxiliary installations consists of the following parts: Part 1: General; Part 2: Materials for pres
19、sure parts of boilers and accessories; Part 3: Design and calculation for pressure parts of the boiler; Part 4: In-service boiler life expectancy calculations; Part 5: Workmanship and construction of pressure parts of the boiler; Part 6: Inspection during construction, documentation and marking of p
20、ressure parts of the boiler; Part 7: Requirements for equipment for the boiler; Part 8: Requirements for firing systems for liquid and gaseous fuels for the boiler; Part 9: Requirements for firing systems for pulverized solid fuels for the boiler; Part 10: Requirements for safeguards against excessi
21、ve pressure; Part 11: Requirements for limiting devices of the boiler and accessories; Part 12: Requirements for boiler feedwater and boiler water quality; Part 13: Requirements for flue gas cleaning systems; Part 14: Requirements for flue gas DENOX-systems using liquified pressurized ammonia and am
22、monia water solution; BS EN 12952-7:2012EN 12952-7:2012 (E) 4 Part 15: Acceptance tests; Part 16: Requirements for grate and fluidized-bed firing systems for solid fuels for the boiler; CR 12952 Part 17: Guideline for the involvement of an inspection body independent of the manufacturer; Part 18: Op
23、erating instructions. Although these parts may be obtained separately, it should be recognised that the parts are inter-dependent. As such, the design and manufacture of water-tube boilers requires the application of more than one part in order for the requirements of this European Standard to be sa
24、tisfactorily fulfilled. NOTE 1 Part 4 and Part 15 are not applicable during the design, construction and installation stages. NOTE 2 A “Boiler Helpdesk“ has been established in CEN/TC 269 which may be contacted for any questions regarding the application of European Standards series EN 12952 and EN
25、12953, see the following website: http:/www.boiler-helpdesk.din.de According to the CEN/CENELEC Internal Regulations, the national standards organisations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, E
26、stonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 12952-7:2012EN
27、 12952-7:2012 (E) 5 1 Scope This part of this European Standard specifies the essential requirements for equipment and protective devices for a water-tube boiler plant as defined in EN 12952-1, to ensure the boiler operates safely within the allowable limits (pressure, temperature, etc.). NOTE 1 Add
28、itional requirements specially needed for boilers without manual intervention are specified in Clause 7. NOTE 2 Requirements for equipment for chemical recovery boilers are given in Annex A. 2 Normative references The following documents, in whole or in part, are normatively referenced in this docum
29、ent and are indispen-sable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 837-1, Pressure gauges Part 1: Bourdon tube pressure gauges Dimensions, metrology, requir
30、ements and testing EN 12952-1:2001, Water-tube boilers and auxiliary installations Part 1: General EN 12952-3:2011, Water-tube boilers and auxiliary installations Part 3: Design and calculation for pressure parts of the boiler EN 12952-8:2002, Water-tube boilers and auxiliary installations Part 8: R
31、equirements for firing systems for liquid and gaseous fuels for the boiler EN 12952-9:2002, Water-tube boilers and auxiliary installations Part 9: Requirements for firing systems for pulverized solid fuels for the boiler EN 12952-10:2002, Water-tube boilers and auxiliary installations Part 10: Requi
32、rements for safeguards against excessive pressure EN 12952-11:2007, Water-tube boilers and auxiliary installations Part 11: Requirements for limiting devices of the boiler and accessories EN 12952-12:2003, Water-tube boilers and auxiliary installations Part 12: Requirements for boiler feedwater and
33、boiler water quality EN 12952-13, Water-tube boilers and auxiliary installations Part 13: Requirements for flue gas cleaning systems EN 12952-14, Water-tube boilers and auxiliary installations Part 14: Requirements for flue gas DENOX-systems using liquefied pressurized ammonia and ammonia water solu
34、tion EN 12952-16:2002, Water-tube boilers and auxiliary installations Part 16: Requirements for grate and fluidized-bed firing systems for solid fuels for the boiler EN 12952-18, Water-tube boilers and auxiliary installations Part 18: Operating instructions EN 50156-1:2004, Electrical equipment for
35、furnaces and ancillary equipment Part 1: Requirements for application design and installation BS EN 12952-7:2012EN 12952-7:2012 (E) 6 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 12952-1:2001, EN 12952-8:2002, EN 12952-9:2002, EN 12952-11:2007, EN
36、12952-12:2003 and EN 12952-16:2002 and the following apply. 3.1 Types of steam boilers and hot water generators 3.1.1 natural circulation steam boilers and hot water generators steam boilers and hot water generators in which the water to be evaporated/heated circulates due to the differences in dens
37、ity 3.1.2 forced or assisted circulation steam boilers and hot water generators steam boilers and hot water generators in which the water to be evaporated/heated is circulated by means of pumps 3.1.3 once-through steam boilers and hot water generators steam boilers, with or without separating vessel
38、s, where the water flow is determined by the feedwater pump, and the water is evaporated completely or in a major portion during one single passage Note 1 to entry: Hot water generators, where the water flow is effected by the circulating pump of the heating system and is heated during one single pa
39、ssage, e.g. once-through hot water generator where there is no contact between hot and cold water in the drum (two-way drum) once-through hot water generator with header distributing water from below. 3.1.4 waste heat steam boilers and hot water generators boilers and generators utilising heat recov
40、ered from outside sources, e.g. gas turbines, blast furnaces 3.2 limits of steam boilers and hot water generators boundaries of the steam and water spaces located between the shut-off devices of the steam boilers and hot water generators in the inlet, outlet, pressure retaining, overflow, and drain
41、lines Note 1 to entry: The bodies of the shut-off devices are considered to be within these limits. 3.3 steam boiler and hot water generating plant plant consists of one or more water-tube boilers and their equipment as defined in EN 12952-1 3.4 heat supply system assembly of components in which the
42、 energy of the fuel (including electrical and waste-heat energy) is supplied to the steam boilers and hot water generators 3.5 classification of pressure generation systems (Hot water generators) 3.5.1 internally pressurised systems systems where the pressure is generated by the saturation pressure
43、corresponding to the flow temperature 3.5.2 externally pressurised systems systems where the pressure is generated by methods such as gas cushion or pressure pumps BS EN 12952-7:2012EN 12952-7:2012 (E) 7 3.6 expansion vessels containers to compensate for temperature related changes in water volume c
44、losed expansion vessels are pressurised open expansion vessels are vented to atmospheric pressure and are not pressurised 3.7 maximum continuous rating (MCR) maximum continuous steam output that can be generated during continuous operation 3.8 allowable heat output maximum heat output (water mass fl
45、ow times the difference between outlet and inlet enthalpy) that can be generated during continuous operation and at which hot water generators may be operated 3.9 maximum allowable pressure (PS) maximum pressure for which equipment is designed, as specified by the manufacturer, and at a location spe
46、cified by the manufacturer Note 1 to entry: This may be the location of connection of protective and/or limiting devices or the top of equipment or, if not applicable, any point specified. 3.10 maximum allowable temperature (TS) maximum temperature of the fluid for which equipment is designed by the
47、 manufacturer, and at a location specified by the manufacturer Note 1 to entry: Typically, this is at the outlet of the generator. 3.11 controls devices used for holding the variable to be controlled (e.g. water level, pressure, temperature) at a specified value (set point) 3.12 limiter limiting dev
48、ice that, on reaching a fixed value (e.g. pressure, temperature, flow, water level) is used to interrupt and lock-out the heat supply and requires manual unlocking before restart Limiting device requires: a measuring or detection function, and an activation function for correction, or shutdown, or s
49、hutdown 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 part of a protective system (e.g. sensors, limiters, etc.) (see also Figure 1). If this is achieved by multi-channel systems, then all items or limiters for safety purposes are included within the protective system. Note 1 to entry: Manual resetting can be realised
