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1、BRITISH STANDARD BS EN 14222:2003 Stainless steel shell boilers The European Standard EN 14222:2003 has the status of a British Standard ICS 27.060.30 ? BS EN 14222:2003 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 14 May 2003 BSI 14 May 2
2、003 ISBN 0 580 41804 9 National foreword This British Standard is the official English language version of EN 14222:2003. The UK participation in its preparation was entrusted to Technical Committee PVE/16, Shell boilers, which has the responsibility to: A list of organizations represented on this c
3、ommittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “ International Standards Correspondence Index” , or by using
4、the “ Search” facility of the BSI Electronic Catalogue or of British Standards Online. 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 does not of itself confer immunity fro
5、m legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the
6、UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date
7、Comments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14222 April 2003 ICS 27.060.30 English version Stainless steel shell boilers Chaudires tubes de fume en acier inoxydableEdelstahl-Growasserraumkessel This European Standard was approved by CEN on 21 February 2003. CEN members are bound to
8、 comply with 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 Manage
9、ment 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 Management Centre has the same status as the of
10、ficial versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITT
11、EE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2003 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14222:2003 E EN 14222:2003 (E) 2 Conten
12、ts page Foreword3 1Scope 4 2Normative references 4 3Terms and definitions4 4Materials5 5Design.5 6Manufacture5 7Inspection and testing.5 8Marking .5 9Requirements for equipment5 9.1General5 9.2Safeguards against excessive pressure .5 9.3Materials for valves, fittings, flanges and bolting 5 9.4Limiti
13、ng devices and safety circuits6 9.5Boiler heat supply6 9.6Water level indication6 9.7Steam pressure indication7 9.8Drain and blowdown devices8 9.9Valves for connections8 9.10Feed water supply8 9.11Feed water control.8 9.12Limiting devices.9 10Operational aspects of steam boilers9 11Small steam boile
14、rs .9 Annex A (informative) Operational aspects of steam boilers10 Annex ZA (informative) Clauses of this European Standard addressing essential safety requirements of the Pressure Equipment Directive.11 Bibliography12 ? EN 14222:2003 (E) 3 Foreword This document (EN 14222:2003) has been prepared by
15、 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 October 2003, and conflicting national stan
16、dards shall be withdrawn at the latest by October 2003. 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) Pressure Equipment Directive (PED) 97/23/EC 1. For relations
17、hip with EU Directive(s), see informative annex ZA, which is an integral part of this document. This European Standard refers to EN 12953: Shell boilers and EN 13445: Unfired pressure vessels. Annex A is informative. According to the CEN/CENELEC Internal Regulations, the national standards organizat
18、ions of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and the United Kingdom.
19、 ? EN 14222:2003 (E) 4 1 Scope This European Standard specifies requirements for electrically heated shell boilers manufactured from stainless steel specifically dedicated for generating steam for sterilizers and disinfectors. This European Standard covers only boilers that are heated by immersion h
20、eaters and which have a maximum allowable pressure (PS) of 6 bar, a maximum volume (V) of 1 000 litres and a product of PS x V not greater than 3 000 bar x l. 2 Normative references This European Standard incorporates by dated or undated reference, provisions from other publications. These normative
21、 references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated referenc
22、es the latest edition of the publication referred to applies (including amendments). EN 285:1996, Sterilisation Steam sterilizers Large sterilizers. EN 12953-1, Shell boilers Part 1: General. EN 12953-5, Shell boilers Part 5: Inspection during construction, documentation and marking of pressure part
23、s of the boiler. EN 12953-6, Shell boilers Part 6: Requirements for equipment for the boiler. EN 12953-8, Shell boilers Part 8: Requirements for safeguards against excessive pressure. prEN 12953-9:1999, Shell boilers Part 9: Requirements for limiting devices and safety circuits of the boiler and acc
24、essories. EN 13445-2:2002, Unfired pressure vessels Part 2: Materials. EN 13445-3, Unfired pressure vessels Part 3: Design. EN 13445-4, Unfired pressure vessels Part 4: Fabrication. EN 13445-5, Unfired pressure vessels Part 5: Inspection and testing. EN 60204-1, Safety of machinery Electrical equipm
25、ent of machines Part 1: General requirements (IEC 60204-1:1997). 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 12953-1 and EN 12953-6 and the following apply: 3.1 controls devices used for maintaining the variable to be controlled (e.g. wat
26、er level, pressure, temperature) at a specific value (set point) 3.2 limiters device that, on reaching a fixed value (e.g. pressure, temperature, flow, water level) is used to interrupt and lock- out the heating energy supply and lock-out requires manual unlocking before restart ? EN 14222:2003 (E)
27、5 3.3 lock-out isolation of energy supply which requires a manual intervention to reinstate 3.4 functional check testing of the safety device to ensure it performs its intended function 4 Materials Each steam boiler shall be manufactured from materials in steel group 8 or 10 in accordance with EN 13
28、445-2:2002, annex A. 5 Design Each steam boiler shall be designed in accordance with EN 13445-3. 6 Manufacture Each steam boiler shall be manufactured in accordance with EN 13445-4. 7 Inspection and testing Each steam boiler shall be inspected, tested and documented in accordance with EN 13445-5. 8
29、Marking The requirements for marking shall be in accordance with EN 12953-5. 9 Requirements for equipment 9.1 General The following requirements for equipment for electrically heated stainless steel shell boilers are worked out on the basis of EN 12953-6. 9.2 Safeguards against excessive pressure Ea
30、ch steam boiler shall be equipped with safeguards against excessive pressure in accordance with EN 12953-8. In a deviation from EN 12953-8 the minimum inside diameter of the safety valve seat could be reduced to 8 mm. 9.3 Materials for valves, fittings, flanges and bolting Steel materials for valves
31、, fittings, flanges and bolting shall be in accordance with EN 13445-2. ? EN 14222:2003 (E) 6 9.4 Limiting devices and safety circuits 9.4.1Limiters shall be designed in addition to prEN 12953-9. In accordance with prEN 12953-9:1999, 5.4.2 level electrode inclinations between 45 and 90 from the vert
32、ical shall be allowed provided that functional capability examinations have proven successful. The electrical safety circuits shall be in accordance with EN 60204-1. 9.4.2Functional checking of all limiters shall be possible at any time during operation e.g. by simulation where appropriate. 9.4.3If
33、a limiter responds, the boiler shall automatically go to a safe condition and a signal shall be given to indicate boiler malfunction. 9.4.4After manual resetting of a limiter lock-out, the boiler shall be put back into operation by manual intervention only. 9.5 Boiler heat supply 9.5.1The pressure o
34、f each boiler shall be controlled automatically by regulating the heating energy input. 9.5.2Automatic start-up of the boiler and the system is permitted provided that equipment is installed to ensure that start-up is conducted safely. Automatic restarting after normal shut-down shall not be conside
35、red a start-up. 9.5.3A high temperature alarm device for shutting off the heating energy supply shall be provided. The alarm temperature shall be determined by the manufacturer. 9.5.4The electrical supply circuits and the safety of the control equipment shall conform to EN 60204-1. 9.6 Water level i
36、ndication 9.6.1Each steam boiler shall have at least one independent means (independent from other equipment) of indicating the water level, which shall be a gauge of transparent material directly connected to the boiler shell. 9.6.2The gauge(s) shall be mounted so that the water level is visible th
37、rough the transparent material at the lowest alarm level, i.e. at the lowest permissible water level (LWL), which shall be marked. The maximum permissible water level, which shall be specified by the boiler manufacturer, shall be visible. The gauge shall be capable of showing a measurement of “15 mm
38、 below LWL“. 9.6.3The lowest permissible water level (LWL) of the boiler (see Figure 1), which shall be permanently and legibly marked on the boiler shell and identified by the letters “LWL“, shall be at least 30 mm above the uppermost surface of the immersion heaters “HHS“. ? EN 14222:2003 (E) 7 Ke
39、y 1Controlled water level 2LWL 3HHS Figure 1 Water level indication 9.6.4Pipes and fittings connecting a water level gauge to a boiler shall be as short as possible and constructed so that no undrained pocket is formed between the boiler and the gauge. There shall be no outlet therefrom except for r
40、egulators, steam pressure gauges and drains or other similar apparatus, which does not permit the escape of a significant amount of steam. Pipes connecting a water level gauge to the boiler shall not be less than 8 mm bore. Where a chamber of a safety control or alarm device is fitted to the water g
41、auge or its piping, the connecting pipes between the boiler and the water level gauge shall have a bore not less than 15 mm. 9.6.5Where the water level gauge is a part of the boiler shell, the requirements of 9.6.4 shall not apply. 9.7 Steam pressure indication 9.7.1Each boiler shall have a steam pr
42、essure gauge in accordance with EN 285:1996, 6.1.1.2, connected to the steam space either directly or through the water level gauge column or its steam connection. 9.7.2The steam pressure gauge shall be connected to a siphon or similar device of sufficient capacity to keep the gauge tube filled with
43、 water. The pipe shall be of sufficient size and shall have provision for blowing through if possible. Alternatively the pressure line shall be fitted with an isolating membrane close to the boiler. The pressure line between the membrane and the gauge shall contain a non-compressible fluid. 9.7.3Ste
44、am pressure gauge connections shall be made suitable for the design working pressure of the boiler. 9.7.4Pressure gauges shall be graduated to indicate the pressure in bars. The maximum allowable pressure shall be indicated by a fixed and readily visible red mark on the pressure gauge. NOTEIn additi
45、on, the operating pressure and the safety valve set pressure may also be indicated. 9.7.5Each boiler shall be provided with a valve connection for the special purpose of connecting a test gauge when the boiler is in service so that the accuracy of the boiler steam gauge can be ascertained. ? EN 1422
46、2:2003 (E) 8 9.8 Drain and blowdown devices 9.8.1Each boiler shall be fitted with drain valves placed at, or as near as practicable to, the lowest point of the apparatus. NOTEOn some boilers, drain valves may be used for blowdown purposes. 9.8.2Where drain valves from two or more boilers are connect
47、ed to a common discharge, two valves shall be fitted to each drain line, one being of a non-return type to prevent the contents of one boiler passing to another. As an alternative to the non-return valves an interlock system, enabling only one valve to be open at a time shall be allowed. 9.8.3Taper-
48、plug valves where fitted, shall be of the bolted cover type with separately packed glands. 9.8.4Where drain valves are not self-closing or capable of being locked in the closed position, a further shut-off device shall be installed in the line. NOTEHaving the drain valve enclosed by a cabinet or an
49、inspection door is included in the term “being locked in a closed position“. 9.9 Valves for connections 9.9.1 Steam outlets The stop valve connecting the boiler to the steam pipe shall be attached directly to the boiler or shall be as near to it as practicable. The valve should preferably be of a type, which positively indicates whether it is open or closed. Where more than one boiler is connected to