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EN 12952-7:2002

(Main)

Water-tube boilers and auxiliary installations - Part 7: Requirements for equipment for the boiler

Water-tube boilers and auxiliary installations - Part 7: Requirements for equipment for the boiler

This part of the European Standard defines the requirements for equipment for steam boilers and hot water generators as defined in EN 12952-1, wherein steam or hot water will be generated. Requirements for equipment for chemical recovery boilers are given in annex A and design examples for hot water generating systems are given in annex B.

Wasserrohrkessel und Anlagenkomponenten - Teil 7: Anforderungen an die Ausrüstung für den Kessel

Dieser Teil der Europäischen Norm legt die Anforderungen an die Ausrüstung von Dampf- und Heißwasserkessel, wie in EN 12952-1 beschrieben, fest, in denen Dampf oder Heißwasser erzeugt wird. Anforderungen an die Ausrüstung von Laugenrückgewinnungskessel sind in Anhang A enthalten. Ausführungsbeispiele für Heißwassererzeugungsanlagen sind in Anhang B enthalten.

Chaudières à tubes d'eau et installations auxiliaires - Partie 7: Exigences pour l'équipement de la chaudière

La présente partie de la Norme européenne définit les exigences pour l'équipement des chaudières à vapeur et générateurs d'eau surchauffée tels que définis dans l'EN 12952-1, dans lesquels la vapeur ou l'eau surchauffée sont produites. Les prescriptions relatives à l'équipement des chaudières de récupération chimiques sont données en annexe A, et des exemples de conception de systèmes de générateurs d'eau surchauffée sont donnés en annexe B.

Vodocevni kotli in pomožne napeljave - 7. del: Zahteve za opremo kotla

General Information

Status
Withdrawn
Publication Date
21-May-2002
Withdrawal Date
23-Oct-2012
ICS
27.040 - Gas and steam turbines. Steam engines
Technical Committee
CEN/TC 269 - Shell and water tube boilers
Drafting Committee
CEN/TC 269/WG 3 - Equipment
Current Stage
9960 - Withdrawal effective - Withdrawal
Start Date
24-Oct-2012
Completion Date
24-Oct-2012
Directive
97/23/EC - Directive 97/23/EC of the European Parliament and of the Council of 29 May 1997 on the approximation of the laws of the Member States concerning pressure equipment
Mandate
M/071 - Mandate to CEN for standardization in the field of Pressure equipment
Ref Project
SIST EN 12952-7:2002 - Water-tube boilers and auxiliary installations - Part 7: Requirements for equipment for the boiler

Relations

Replaced By
EN 12952-7:2012 - Water-tube boilers and auxiliary installations - Part 7: Requirements for equipment for the boiler
Effective Date
31-Oct-2012

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SLOVENSKI STANDARD
01-november-2002
Vodocevni kotli in pomožne napeljave - 7. del: Zahteve za opremo kotla
Water-tube boilers and auxiliary installations - Part 7: Requirements for equipment for the
boiler
Wasserrohrkessel und Anlagenkomponenten - Teil 7: Anforderungen an die Ausrüstung
für den Kessel
Chaudieres a tubes d'eau et installations auxiliaires - Partie 7: Exigences pour
l'équipement de la chaudiere
Ta slovenski standard je istoveten z: EN 12952-7:2002
ICS:
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 12952-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2002
ICS 27.040
English version
Water-tube boilers and auxiliary installations - Part 7:
Requirements for equipment for the boiler
Chaudières à tubes d'eau et installations auxiliaires - Partie Wasserrohrkessel und Anlagenkomponenten - Teil 7:
7: Exigences pour l'équipement de la chaudière Anforderungen an die Ausrüstung für den Kessel
This European Standard was approved by CEN on 25 March 2002.
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, Malta, 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
© 2002 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 12952-7:2002 E
worldwide for CEN national Members.

Contents
1 Scope .4
2 Normative references .4
3 Terms and definitions.5
3.1 Types of steam boilers and hot water generators.5
3.6 Classification of pressure generation systems (Hot water generators) .5
4 General requirements for steam boilers and hot water generators .7
4.1 Safeguards against excessive pressure .7
4.2 Heat supply system .7
4.3 Ash removal plants.7
4.4 Flue-gas cleaning plants .7
4.5 Requirements for limiting devices and safety circuits .8
4.6 Cleaning, access and inspection openings .8
4.7 Feed lines and protection against feedwater backflow .12
4.8 Connection of steam boilers or hot water generators .12
5 Special requirements for steam boilers .13
5.1 Requirements for pumps .13
5.2 Isolating and drain devices.14
5.3 Lowest permissible water level (LWL).14
5.4 Water level and flow indicators .15
5.5 Water supply control and protective device against water shortage.16
5.6 Pressure and temperature measuring devices.16
5.7 Marking .16
6 Special requirements for hot water generators.16
6.1 Requirements for hot water generating systems .16
6.2 Requirements for pumps .17
6.3 Shut-off and drain devices.18
6.4 Lowest permissible water level and installation of flow and return line.19
6.5 Water level and flow indicators .19
6.6 Water supply and drain control, protective device against water shortage.20
6.7 Safeguards against minimum pressure .20
6.8 Safety device for temperature control .20
6.9 Pressure and temperature indicating devices.20
6.10 Marking .21
7 Additional requirements for plants without permanent supervision .21
7.1 General.21
7.2 Steam boilers.21
7.3 Hot water generators .22
8 Final assessment of safety devices.24
8.1 Performance of inspection.24
8.2 Equipment on the steam and water side .24
8.3 Firing system equipment .25
8.4 Electrical safety circuit.25
8.5 Operating instructions .25
9 Small plant boilers .25
9.1 Steam boilers.25
9.2 Hot water generators .26
Annex A (normative) Chemical recovery boilers (Black liquor recovery boilers) .28
Annex B (informative) Design examples for hot water generating systems.30
Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other
provisions of the Pressure Equipment Directive.49
Foreword
This document (EN 12952-1:2002) 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 November 2002, and conflicting national standards shall be withdrawn at the latest
by November 2002.
For relationship with EU Directive(s), see informative annex ZA, which is an integral part of this document.
This Part of this European Standard has been prepared under a mandate given to CEN by the European Commis-
sion and the European Free Trade Association and supports essential safety requirements of the Pressure Equip-
ment Directive (PED) [1]. For relationship with Pressure Equipment Directive see informative Annex ZA, which is an
integral Part of this Standard.
The European Standard EN 12952 concerning water-tube boilers and auxiliary installations 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: 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 pressure 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 excessive 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.
Part 15: Acceptance tests.
Part 16: Requirements for grate and fluidized bed firing systems for solid fuels for the boiler.
CR 12952-17: 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. As
such, the design and manufacture of water-tube boilers requires the application of more than one Part in order for
the requirements of the standard to be satisfactorily fulfilled.
NOTE Parts 4 and 15 are not applicable during the design, construction and installation stages.
The Annex A is normative. The Annex B of this European Standard are informative.
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.
1 Scope
This Part of this European Standard specifies the requirements for equipment for steam boilers and hot water
generators as defined in EN 12952-1, wherein steam or hot water will be generated. Requirements for equipment
for chemical recovery boilers are given in Annex A, and design examples for hot water generating systems are
given in Annex B.
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 amendments).
EN 837-1, Pressure gauges — Part 1: Bourdon tube pressure gauges — Dimensions, metrology, requirements and
testing.
EN 12952-1,  

   
 

  1: General.
EN 12952-6,  

   
 

  6: Inspection during construction; documentation
and marking of pressure parts of the boiler.
EN 12952-8,  

   
 

  8: Requirements for firing systems for liquid and
gaseous fuels for the boiler.
prEN 12952-9,  

   
 

  9: Requirements for firing systems for pul-
verized solid fuels for the boiler.
prEN 12952-10,  

   
 

  10: Requirements for safeguards against ex-
cessive pressure.
prEN 12952-11,  

   
 

  11: Requirements for limiting devices of the
boiler and accessories.
prEN 12952-12,  

   
 

  12: Requireme
...

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1.1   General
This European Standard applies to water-tube boilers with volumes in excess of two litres for the generation of steam and/or hot water at a maximum allowable pressure PS greater than 0,5 bar and with a temperature in excess of 110 °C as well as auxiliary installations (other plant equipment).
The purpose of this European Standard is to ensure that the necessary essential safety requirements according to Annex I of the Pressure Equipment Directive are fulfilled in order to guarantee the safety of water tube boilers.
This aim will be achieved by:
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-   the provision of protective measures against hazards, which cannot be eliminated, and
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which are incorporated in the various parts of this European Standard.
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1.2   Boiler assembly
For the purpose of this European Standard, the boiler assembly includes:
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-   additionally, the piping that is connected to the boiler involved in services such as draining, venting, desuperheating, etc., up to and including the first isolating valve in the tubing line downstream of the boiler;
-   reheaters which are independently fired, and are separately provided with their safety accessories including all control and safety systems.
The following equipment and components can be integrated in the assembly at the discretion of the manufacturer:
-   isolatable superheaters, reheaters, economizers and related interconnecting piping;
-   the heat supply or firing system;
-   the means of preparing and feeding the fuel to the boiler including the control systems;
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-   the pressure expansion vessels and tanks of hot water generating plant.
1.3   Other plant equipment
a)   The boiler supporting structural steelwork, the thermal insulation and/or brickwork and the casing;
b)   the means of providing the boiler with air including the forced draught fans and air pre-heaters which are heated by the gases of combustion;
c)   the facilities for moving flue gases through the boiler up to the stack inlet, including the induced draught fans and the air pollution reducing equipment located in the flue gas removal path;
d)   all other equipment necessary for the operation of the boiler plant.
1.4   Exclusions
This European Standard does not apply to the following types of boiler plant:
a)   boilers other than stationary boilers;
b)   shell type boilers;
c)   electrical boilers;
d)   nuclear primary circuits, the failure of which can cause an emission of radioactivity.

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Water-tube boilers and auxiliary installations - Part 7: Requirements for equipment for the boiler
SIST EN 12952-7:2012

This part of this European Standard specifies the essential requirements for equipment and protective devices for 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   Additional 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.

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