SIST EN 12952-10:2003

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Wasserrohrkessel und Anlagenkomponenten - Teil 10 : Anforderungen an Sicherheitseinrichtungen gegen DrucküberschreitungChaudieres a tubes d'eau et installations auxiliaires - Partie 10: Exigences pour la protection vis-a-vis des exces de pressionWater-tube boilers and auxiliary installations - Part 10: Requirements for safeguards against excessive pressure27.060.30Grelniki vode in prenosniki toploteBoilers and heat exchangers13.240Varstvo pred previsokim tlakomProtection against excessive pressureICS:Ta slovenski standard je istoveten z:EN 12952-10:2002SIST EN 12952-10:2003en01-december-2003SIST EN 12952-10:2003SLOVENSKI
STANDARD



SIST EN 12952-10:2003



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 12952-10September 2002ICS 23.060.40; 27.040English versionWater-tube boilers and auxiliary installations - Part 10:Requirements for safeguards against excessive pressureChaudières à tubes d'eau et installations auxiliaires - Partie10: Exigences pour la protection vis-à-vis des excès depressionWasserrohrkessel und Anlagenkomponenten - Teil 10 :Anforderungen an Sicherheitseinrichtungen gegenDrucküberschreitungThis European Standard was approved by CEN on 22 March 2002.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 12952-10:2002 ESIST EN 12952-10:2003



EN 12952-10:2002 (E)2Contents1Scope.42Normative references.43Terms and definitions.44Symbols and abbreviations.45Requirements.55.1Steam boiler.55.2Hot water generator.8Annex ZA (informative)
Clauses of this European Standard addressing essential safety requirements orother provisions of Pressure Equipment Directive.10Bibliography.11SIST EN 12952-10:2003



EN 12952-10:2002 (E)3ForewordThis document (EN 12952-10:2002) has been prepared by Technical Committee CEN/TC 269 "Shell and wa-ter-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 orby endorsement, at the latest by March 2003, and conflicting national standards shall be withdrawn at the latest byMarch 2003.This document has been prepared under a mandate given to CEN by the European Commission and the EuropeanFree 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.The European Standard EN 12952 concerning water-tube boilers and auxiliary installations consists of the followingparts:¾ Part
1: General.¾ Part
2: Materials for pressure parts of boilers and accessories.¾ Part
3: Design and calculation for pressure parts.¾ Part
4: In-service boiler life expectancy calculations.¾ Part
5: Workmanship and construction of pressure parts of the boiler.¾ Part
6: Inspection during construction, documentation and marking of pressure parts of the boiler.¾ Part
7: Requirements for equipment for the boiler.¾ Part
8: Requirements for firing systems for liquid and gaseous fuels for the boiler.¾ Part
9: Requirements for firing systems for pulverized solid fuels for the boiler.¾ Part 10: Requirements for safeguards against excessive pressure.¾ Part 11: Requirements for limiting devices
of the boiler and accessories.¾ Part 12: Requirements for boiler feedwater and boiler water quality.¾ Part 13: Requirements for flue gas cleaning systems.¾ Part 14: Requirements for flue gas DENOX-systems.¾ Part 15: Acceptance tests.¾ 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.Although these Parts can be obtained separately, it should be recognized that the Parts are inter-dependent. Assuch, the design and manufacture of water-tube boilers requires the application of more than one Part in order forthe requirements of the standard to be satisfactorily fulfilled.NOTEParts 4 and
15 are not applicable during the design, construction and installation stages.According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun-tries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Swe-den, Switzerland and the United Kingdom.SIST EN 12952-10:2003



EN 12952-10:2002 (E)41 ScopeThis Part of this European Standard specifies the requirements for safeguards against excessive pressure inwater-tube boilers as defined in EN 12952-1.2 Normative referencesThis European Standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. For datedreferences, subsequent amendments to or revisions of any of these publications apply to this European Standard onlywhen incorporated in it by amendment or revision. For undated references, the latest edition of the publicationreferred to applies (including amendments).prEN 1268-1, Safety devices for the protection against excessive pressure — Part 1: Safety valves.prEN 1268-5, Safety devices for the protection against excessive pressure — Part 5: Controlled safety pressurerelief systems (CSPRS) — General requirements.EN 12952-1:2002, Water-tube boilers and auxiliary installations — Part 1: General.prEN ISO 4126-4, Safety devices for protection against excessive pressure — Part 4: Pilot-operated safety valves(ISO/DIS 4126-4:1999).3 Terms and definitionsFor the purposes of this European Standard the terms and definitions given in EN 12952-1 apply.4 Symbols and abbreviationsFor the purposes of this part of this European Standard, the symbols given in EN 12952-1:2002, Table 4-1 shall apply.Throughout this part of this European Standard, additional terminology and symbols have been included wherenecessary to meet the requirements of the specific text concerned (see Table 4-1 and Figure 4-1).Table 4-1 — Symbols and unitsSymbolexplanationunitDEinlet pipe internal diametermmd0smallest flow diameter (minimum free bore)mmLEdeveloped length of inlet pipemmSIST EN 12952-10:2003



EN 12952-10:2002 (E)5Figure 4-1 — Safety valves5 Requirements5.1 Steam boiler5.1.1Each steam boiler and each isolatable heated compartment (e.g. reheater, superheater, economizer) shallbe provided with at least one suitable safety device which shall ensure against excessive pressure. The total certi-fied discharge capacity of all safety devices mounted on the boiler shall be at least equal to the maximum continu-ous rating (MCR) of the boiler. The suitability of the safety device shall be demonstrated by a hot test on the as-sembled boiler.The number and type of safety devices to be installed shall be specified by the manufacturer and shall meet therequirements of this clause.At least one of the following safety device shall be considered suitable:a) direct-loaded safety valves in accordance with prEN 1268-1or;b) assisted safety valves in accordance with prEN 1268-1 or;c) supplementary-loaded
safety valves in accordance with prEN 1268-1 or;d) pilot-operated safety valve (POSV) in accordance with prEN 1268-1 or prEN ISO 4126-4, consisting of a mainvalve, controlled by signals from 3 pilot valves;e) controlled safety pressure relief system (CSPRS) in accordance with prEN 1268-5, consisting of a main valve,controlled by signals from 3 sensing lines.SIST EN 12952-10:2003



EN 12952-10:2002 (E)6In the case of safety devices in accordance with d) and e) the following shall apply:¾ The safety device shall be capable of operating when the signal from only one pressure sensing line is avail-able.¾ The size and position of the pressure sensing lines shall ensure that the risk of loss of function is reduced to aminimum.¾ The mechanical and electrical parts of the pilot and control unit which are used to actuate the main valves shallstill be functionally fit even in the case of an assumed individual defect.¾ It shall be possible to prove the reliability of the safety pressure relief device by functional testing on the plant.In case of assisted, supplementary loaded safety valves, POSV and CSPRS shall be allowed to control one or moremain valves by the same control unit.5.1.2The minimum flow diameter of safety valves or main valves of POSV or CSPRS for boilers with a volume£ 10 litres shall be at least 6 mm and for volumes > 10 litres shall be at least 15 mm.5.1.3In the case of boilers without superheater(s) the safety valves or main valves of POSV or CSPRS shall beconnected to the steam space.NOTEIf the total required discharge capacity is qm and the drumspace is simultaneously protected by n safety devices(n > 1) the discharge capacity of each of them should be at least qm/(n + 1).5.1.4In the case of once-through steam generators the safety valves or main valves of POSV or CSPRS shallbe located at the steam outlet of the boiler.5.1.5In the case of super
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