SIST EN 12953-8:2002

SLOVENSKI STANDARD
01-maj-2002
Mnogovodni kotli - 8. del: Zahteve za opremo in varnostne naprave za
preprečevanje prekoračitve tlaka
Shell boilers - Part 8: Requirements for safeguards against excessive pressure
Großwasserraumkessel - Teil 8: Anforderungen an Sicherheitseinrichtungen gegen
Drucküberschreitung
Chaudieres a tubes de fumée - Partie 8: Exigences pour la protection vis-a-vis des exces
de pression
Ta slovenski standard je istoveten z: EN 12953-8:2001
ICS:
13.240 Varstvo pred previsokim Protection against excessive
tlakom pressure
27.060.30 Grelniki vode in prenosniki Boilers and heat exchangers
toplote
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 12953-8
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2001
ICS 27.060.30; 27.100
English version
Shell boilers - Part 8: Requirements for safeguards against
excessive pressure
Chaudières à tubes de fumée - Partie 8: Exigences pour la Großwasserraumkessel - Teil 8: Anforderungen an
protection vis-à-vis des excès de pression Sicherheitseinrichtungen gegen Drucküberschreitung
This European Standard was approved by CEN on 7 September 2001.
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 alteration. Up-to-date lists and bibliographical references concerning such national
standards 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 translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12953-8:2001 E
worldwide for CEN national Members.

Contents
Page
Foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Requirements . 4
4.1 General requirements for safeguards (safety pressure relief devices) . . . 4
4.2 Discharge capacity . 5
4.3Set pressures . 5
4.4 Cross-sections and pressure losses in the inlet pipe of safety valves
in accordance with prEN ISO 4126-1 . 5
4.5Discharge lines . 6
Annex ZA (informative) Clauses of this European Standard addressing
essential safety requirements or other provisions of the Pressure Equipment
Directive . 7
Foreword
This European Standard 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, either by publication of an identical text or by
endorsement, at the latest by May 2002, and conflicting national standards shall be withdrawn at the latest by May 2002.
This European Standard 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(s), see informative annex ZA, which is an integral part of this standard.
The European Standard series 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 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 boiler
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, and safety circuits 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 instructions
Part 14: Guidline for the involvement of an inspection body independent of the manufacturer (TR)
Although these Parts may be obtained separately, it should be recognised that the Parts are inter-dependent. 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 organizations of the following countries are
bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany,
Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United
Kingdom.
1 Scope
This Part of this European Standard specifies the requirements for safeguards against excessive pressure in shell boilers
as defined in EN 12953-1.
2 Normative references
This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative
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 references, the latest edition of the publication referred to applies
(including amedments).
EN 12953-1, Shell boilers — Part 1: General.
EN 12953-6, Shell boilers — Part 6: Requirements for equipment for the boiler.
prEN ISO 4126-1, Safety devices for protection against excessive pressure — Part 1: Safety valves.
3 Terms and definitions
For the purposes of this European Standard the terms and definitions given in EN 12953-1 and EN 12953-6 apply.
4 Requirements
4.1 General requirements for safeguards (safety pressure relief devices)
4.1.1 Boilers, with the exception of open vented hot water boilers, shall have at least one safety device sized for the
rated output (see 4.2) of the boiler which shall ensure against excessive pressure. The
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