Heating boilers - Heating boilers with forced draught burners - Nominal heat output not exceeding 10 MW and maximum operating temperature of 110 °C

This European Standard specifies the requirements and test methods for the construction, the safety and the rational energy usage for heating boilers (standard-heating and low temperature boilers) fired by liquid fuels from steel and cast iron with burners according to the relevant burner standards (for atomising oil burners, see. EN 267) up to a nominal heat output of 10 MW. They are operated, either with negative pressure (natural draught boiler) or with positive pressure (pressurised boiler) in the combustion chamber, in accordance with the boiler manufacturer's instructions
Boilers in accordance with this European Standard are designed for the heating of central heating installations in which the heat carrier is water, and the maximum allowable operating temperature of which is up to 110 °C and the maximum safety temperature limiter of 120 °C. The maximum allowable operating pressure is 10 bar.
This standard does not apply to gas boilers with atmospheric burners, boilers for solid fuels, oil or gas fired condensation boilers, boilers with oil vaporisation burners. For these boilers there are further requirements.
For gas-fired central heating boilers equipped with a forced draught burner of nominal heat out put not exceeding 1000 kW, see prEN 303-7.
For shell boilers with a nominal heat output exceeding 10 MW and a maximum safety temperature limiter exceeding 120 °C, see EN 12953 series.
NOTE   Definitions for heating boiler and low temperature boiler see Council Directive 92/42/EEC.

Heizkessel - Heizkessel mit Gebläsebrennern - Nennwärmeleistung kleiner oder gleich 10 MV und einer maximalen Betriebstemperatur von 110 °C

Diese Europäische Norm legt die Anforderungen und Prüfverfahren für die Konstruktion, die Sicherheit und den rationellen Energieverbrauch für Heizkessel (Standardheiz- und Niedertemperaturheizkessel) für flüssige Brennstoffe aus Stahl oder Gusseisen mit Gebläsebrennern nach den jeweiligen Brennernormen (für Ölzerstäubungsbrenner siehe EN 267) bis zu einer Nennwärmeleistung von 10 MW fest, die nach den Festlegungen des Kesselherstellers entweder mit Unterdruck (Naturzugkessel) oder mit Überdruck (Überdruckkessel) im Brennraum betrieben werden.
Heizkessel nach dieser Europäische Norm sind bestimmt für die Beheizung von zentralen Heizungsanlagen, deren Wärmeträger Wasser mit einer maximalen Betriebstemperatur bis 110 °C und einer Absicherungstemperatur von 120 °C ist. Der hydrostatische Betriebsüberdruck beträgt maximal 10 bar.
Diese Norm gilt nicht für Gasspezialheizkessel mit atmosphärischen Brennern, Heizkessel für feste Brennstoffe, öl- bzw. gasbefeuerte Brennwertkessel, Heizkessel mit Ölverdampfungsbrennern. Für diese Kessel sind andere und teilweise zusätzliche Anforderungen zu erfüllen.
Für gasbefeuerte Zentralheizkessel mit Gebläsebrennern und einer Nennwärmeleistung kleiner gleich 1000 kW, siehe prEN 303-7.
Für Großwasserraumkessel bis zu einer Nennwärmeleistung von 10 MW und einer Absicherungstemperatur von über 120 °C, siehe Normenreihe EN 12953.
ANMERKUNG    Begriffe für Heizkessel und Niedertemperaturheizkessel siehe Richtlinie 92/42/EWG des Rates.

Chaudières de chauffage - Chaudières avec brûleurs à air soufflé - Puissance utile inférieure ou égale à 10 MV et température maximale de service de 110 °C

La présente Norme européenne spécifie les exigences et méthodes d'essai pour la construction, la sécurité et l'utilisation rationnelle de l'énergie pour des chaudières de chauffage (chaudières standard et chaudières basse température) alimentées en combustibles liquides, en acier et en fonte, avec des brûleurs conformes aux normes applicables aux brûleurs (pour des brûleurs à pulvérisation, voir la norme EN 267) jusqu'à une puissance utile nominale de 10 MW. Ces chaudières fonctionnent, selon les instructions du fabricant, soit en dépression (à tirage naturel) ou en pression (chaudières pressurisées) dans la chambre de combustion.
Les chaudières conformes à la présente norme sont conçues pour des installations de chauffage central dont le fluide caloporteur est l'eau, et la température maximale de service autorisée est inférieure ou égale à 110 °C et la température maximale du thermostat limiteur de sécurité est de 120 °C. La pression maximale de service autorisée est de 10 bars.
La présente norme ne s'applique pas aux chaudières à gaz à brûleur atmosphérique, aux chaudières pour combustibles solides, aux chaudières à condensation à gaz ou au fioul, aux chaudières à brûleur fioul à caléfaction. Il existe d'autres exigences complémentaires pour ces chaudières.
Pour des chaudières de chauffage central utilisant des combustibles gazeux équipées de brûleurs à air soufflé dont la puissance utile nominale ne dépasse pas 1 000 kW, voir la prEN 303-7.
Pour des chaudières à tubes de fumée dont la puissance utile nominale dépasse 10 MW et dont la température maximale du thermostat limiteur de sécurité dépasse 120 °C, voir la série des normes EN 12953.
NOTE   Pour les définitions de chaudière de chauffage et chaudière à basse température, voir la directive du Conseil 92/42/CEE.

Kotli za gretje – Kotli z ventilatorskimi gorilniki – Imenska grelna moč do vključno 10 MW in najvišja delovna temperatura 110 °C

General Information

Status
Withdrawn
Publication Date
22-Nov-2005
Withdrawal Date
05-Aug-2008
Current Stage
9960 - Withdrawal effective - Withdrawal
Due Date
06-Aug-2008
Completion Date
06-Aug-2008

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SLOVENSKI STANDARD
SIST EN 14394:2006
01-februar-2006

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Heating boilers - Heating boilers with forced draught burners - Nominal heat output not

exceeding 10 MW and maximum operating temperature of 110 °C

Heizkessel - Heizkessel mit Gebläsebrennern - Nennwärmeleistung kleiner oder gleich

10 MV und einer maximalen Betriebstemperatur von 110 °C

Chaudieres de chauffage - Chaudieres avec bruleurs a air soufflé - Puissance utile

inférieure ou égale a 10 MV et température maximale de service de 110 °C
Ta slovenski standard je istoveten z: EN 14394:2005
ICS:
91.140.10 Sistemi centralnega Central heating systems
ogrevanja
SIST EN 14394:2006 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 14394:2006
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SIST EN 14394:2006
EUROPEAN STANDARD
EN 14394
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2005
ICS 01.040.91; 91.140.10
English Version
Heating boilers - Heating boilers with forced draught burners -
Nominal heat output not exceeding 10 MW and maximum
operating temperature of 110 C

Chaudières de chauffage - Chaudières avec brûleurs à air Heizkessel - Heizkessel mit Gebläsebrennern -

soufflé - Puissance utile inférieure ou égale à 10 MW et Nennwärmeleistung kleiner oder gleich 10 MW und einer

température service maximale de 110 C maximalen Betriebstemperatur von 110 ºC
This European Standard was approved by CEN on 14 October 2005.

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 Central Secretariat 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 Central Secretariat has the same status as the official

versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,

Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,

Slovenia, 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

© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14394:2005: E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN 14394:2006
EN 14394:2005 (E)
Contents
Page

Foreword......................................................................................................................................................................3

1 Scope ..............................................................................................................................................................4

2 Normative references ....................................................................................................................................4

3 Terms and definitions ...................................................................................................................................6

4 Requirements.................................................................................................................................................8

5 Materials .......................................................................................................................................................16

6 Design ...........................................................................................................................................................19

7 Tests..............................................................................................................................................................29

8 Performance requirements .........................................................................................................................32

9 Technical documentation ...........................................................................................................................34

Annex A (normative) Cylindrical shells under internal pressure.........................................................................38

Annex B (normative) Spherical shells and dished heads under internal and external pressure .....................64

Annex C (normative) Dished fire tube heads .........................................................................................................91

Annex D (normative) Flat walls, stayings and girder stays ..................................................................................95

Annex E (normative) Cylindrical shells under external pressure ......................................................................114

Annex F (informative) Pressure Equipment Directive 97/23/EC .........................................................................123

Annex ZA (informative) Relationship between this European Standard and the Essential Requirements

of EU Directive 92/42/EEC of 21 May 1992 on efficiency requirements for new hot-water boilers

fired with liquid or gaseous fuels.............................................................................................................124

Bibliography ............................................................................................................................................................125

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SIST EN 14394:2006
EN 14394:2005 (E)
Foreword

This European Standard (EN 14394:2005) has been prepared by Technical Committee CEN/TC 57 “Central

heating 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 2006, and conflicting national standards shall be withdrawn at the latest by

May 2006.

This European Standard specifies requirements for boilers operating with a temperature of 100 °C and 110 °C

which are not covered by the Pressure Equipment Directive (PED, TS < 110 °C), on the other hand the document

specifies requirements for those boilers, which have a maximum allowable temperature TS > 110 °C (according to

the PED).

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 COUNCIL DIRECTIVE 92/42/EEC of 21

May 1992 on efficiency requirements for new hot-water boilers fired with liquid or gaseous fuels

For relationship with DIRECTIVE 92/42/EEC see informative Annex ZA, which is an integral part of this European

Standard.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following

countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,

Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

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SIST EN 14394:2006
EN 14394:2005 (E)
1 Scope

This European Standard specifies the requirements and test methods for the construction, the safety and the rational

energy usage for heating boilers (standard-heating and low temperature boilers) fired by liquid fuels from steel and

cast iron with burners according to the relevant burner standards (for atomising oil burners, see. EN 267) up to a

nominal heat output of 10 MW. They are operated, either with negative pressure (natural draught boiler) or with

positive pressure (pressurised boiler) in the combustion chamber, in accordance with the boiler manufacturer's

instructions

Boilers in accordance with this European Standard are designed for the heating of central heating installations in

which the heat carrier is water, and the maximum allowable operating temperature of which is up to 110 °C and the

maximum safety temperature limiter of 120 °C. The maximum allowable operating pressure is 10 bar.

This standard does not apply to gas boilers with atmospheric burners, boilers for solid fuels, oil or gas fired

condensation boilers, boilers with oil vaporisation burners. For these boilers there are further requirements.

For gas-fired central heating boilers equipped with a forced draught burner of nominal heat out put not exceeding

1000 kW, see prEN 303-7.

For shell boilers with a nominal heat output exceeding 10 MW and a maximum safety temperature limiter exceeding

120 °C, see EN 12953 series.

NOTE Definitions for heating boiler and low temperature boiler see Council Directive 92/42/EEC.

2 Normative references

The following referenced documents are indispensable for the application of this European Standard. For dated

references, only the edition cited applies. For undated references, the latest edition of the referenced document

(including any amendments) applies.
EN 267, Forced draught oil burners – Definitions, requirements, testing, marking
EN 287–1, Qualification test of welders – Fusion welding – Part 1: Steels

EN 288-9, Specification and approval of welding procedures for metallic materials - Part 9: Welding procedure test

for pipeline welding on land and offshore site butt welding of transmission pipelines

EN 303–1, Heating boilers - Part 1: Heating boilers with forced draught burners - Terminology, general

requirements, testing and marking

EN 303-2, Heating boilers - Part 2: Heating boilers with forced draught burners - Special requirements for boilers

with atomising oil burners

EN 304, Heating boilers – Test code for heating boilers for atomising oil burners

EN 1561, Founding – Grey cast irons
EN 1563, Founding – Spheroidal graphite cast irons

EN 10025-1, Hot rolled products of structural steels - Part 1: General technical delivery conditions

EN 10025-2, Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy structural

steels

EN 10025-3, Hot rolled products of structural steels - Part 3: Technical delivery conditions for

normalized/normalized rolled weldable fine grain structural steels
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SIST EN 14394:2006
EN 14394:2005 (E)
EN 10088-1, Stainless steels - Part 1: List of stainless steels

EN 10088–2, Stainless steels - Part 2: Technical delivery conditions for sheet/plate and strip of corrosion resisting

steels for general purposes
EN 10204:2004, Metallic products - Types of inspection documents

EN 10216-1, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 1: Non-alloy steel

tubes with specified room temperature properties

EN 10216-2, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and

alloy steel tubes with specified elevated temperature properties

EN 10216-3, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 3: Alloy fine grain

steel tubes

EN 10216-4, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 4: Non-alloy and

alloy steel tubes with specified low temperature properties

EN 10216-5, Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 5: Stainless steel

tubes

EN 10217-1, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 1: Non-alloy steel

tubes with specified room temperature properties

EN 10217-2, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 2: Electric welded

non-alloy and alloy steel tubes with specified elevated temperature properties

EN 10217-3, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 3: Alloy fine grain

steel tubes

EN 10217-4, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 4: Electric welded

non-alloy steel tubes with specified low temperature properties

EN 10217-5, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 5: Submerged arc

welded non-alloy and alloy steel tubes with specified elevated temperature properties

EN 10217-6, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 6: Submerged arc

welded non-alloy steel tubes with specified low temperature properties

EN 10217-7, Welded steel tubes for pressure purposes - Technical delivery conditions - Part 7: Stainless steel

tubes

EN 10226-1, Pipe threads where pressure tight joints are made on the threads - Part 1: Taper external threads and

parallel internal threads - Dimensions, tolerances and designation

EN 10226-3, Pipes threads where pressure tight joint are made on the threads - Part 3: Verification by means of

limit gauges
EN 12828, Heating systems in buildings - Design for water-based heating systems

EN 12953-8, Shell boilers - Part 8: Requirements for safeguards against excessive pressure

EN 22553, Welded, brazed and soldered joints – Symbolic representation on drawings (ISO 2553:1992)

EN 60335-1, Household and similar electrical appliances - Safety - Part 1: General requirements (IEC 60335-1:2001,

modified)

EN 60529, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989)

EN 60730-2-9, Automatic electrical controls for household and similar use - Part 2-9: Particular requirements for

temperature sensing controls (IEC 60730-2-9:2000, modified)
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SIST EN 14394:2006
EN 14394:2005 (E)

EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions,

tolerances and designation (ISO 228-1:2000)

EN ISO 228-2, Pipe threads where pressure-tight joints are not made on the threads - Part 2: Verification by means

of limit gauges (ISO 228-2:1987)

EN ISO 4063, Welding and allied processes – Nomenclature of processes and reference numbers (ISO 4063:1998)

EN ISO 6506-1, Metallic materials – Brinell hardness test – Part 1: Test method (ISO 6506- 1:1999)

EN ISO 9606-2, Qualification test of welders - Fusion welding - Part 2: Aluminium and aluminium alloys (ISO 9606-

2:2004)

EN ISO 15607, Specification and qualification of welding procedures for metallic materials - General rules (ISO

15607:2003)

EN ISO 15609-1, Specification and qualification of welding procedures for metallic materials – Part 1: Arc welding

(ISO 15609-1:2004)

EN ISO 15610, Specification and qualification of welding procedures for metallic materials - Qualification based on

tested welding consumables (ISO 15610:2003)

EN ISO 15611, Specification and qualification of welding procedures for metallic materials - Qualification based on

previous welding experience (ISO 15611:2003)

EN ISO 15612, Specification and qualification of welding procedures for metallic materials - Qualification by

adoption of a standard welding procedure (ISO 15612: 2004)

EN ISO 15613, Specification and qualification of welding procedures for metallic materials - Qualification based on

pre-production welding test (ISO 15613:2004)

EN ISO 15614-1, Specification and qualification of welding procedures for metallic materials - Welding procedure

test - Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO 15614-1:2004)

EN ISO 15614-2, Specification and qualification of welding procedures for metallic materials - Welding procedure

test - Part 2: Arc welding of aluminium and its alloys (ISO 15614-2:2005)
ISO 185, Grey cast irons – Classification

ISO 857-1, Welding and allied processes – Vocabulary – Part 1: Metal welding processes

ISO 7005-1, Metallic flanges – Part 1: Steel flanges
ISO 7005-2, Metallic flanges – Part 2: Cast iron flanges
ISO 7005-3, Metallic flanges – Part 3: Copper alloy and composite flanges
3 Terms and definitions

For the purposes of this European Standard, the following terms and definitions apply.

3.1
maximum allowable pressure PS

maximum pressure for which the equipment is designed, as specified by the manufacturer

3.2
test pressure

pressure to which all boilers and their parts are subjected during production in the works of the manufacturer or

during setting up by the installer
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SIST EN 14394:2006
EN 14394:2005 (E)
3.3
type test pressure

pressure to which the pre-production heating boiler(s) and associated parts are subjected before start of mass

production in the manufacturing works
3.4
temperature
3.4.1
maximum/minimum allowable temperature TS

maximum/minimum temperatures for which the equipment is designed, as specified by the manufacturer

3.4.2
operating temperature

maximum allowable temperature at which the boiler can be operated under normal operation conditions at the

maximum setting of the boiler's water temperature controller
3.5
heat output P (heat output range)
amount of heat transferred to the water per unit of time

The heat output range is the span of output below the nominal heat output specified by the manufacturer over which

the boiler meets the requirements of this standard and over which it can be used.

3.6
nominal heat output P

continuous output specified by the manufacturer in accordance with the requirements of this standard. It is the

maximum useful quantity of heat transferred to the heat carrier per hour
3.7
heat input Q

amount of heat in unit time which is supplied to the furnace of the heating boiler by the fuel based on its net calorific

value H
3.8
boiler efficiency ηηηη
ratio of the nominal output (P ) to the heat input (Q ) supplied by the fuel
n B
η =
3.9
required draught

pressure differential between the static air pressure in the place of installation and the static pressure of the

exhaust gases, as measured in the exhaust gas measuring section, which is required for correct operation of the

boiler at nominal output
3.10
gas side resistance
pressure differential between the combustion chamber and the boiler outlet
3.11
soundness of combustion system

pressure tightness of the combustion circuit through which the exhaust gases flow

3.12
exit flue temperature t
temperature measured at the flue outlet of the boiler
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SIST EN 14394:2006
EN 14394:2005 (E)
3.13
flue gas loss

quantity of heat per unit time which leaves the flue gas exit of the boiler unused

3.14
combustion circuit

comprises the combustion chamber, the heat exchanger, and the combustion product circuit up to the flue exit

3.15
standby loss q

quantity of heat which is necessary to maintain the boiler at a given temperature when no heat output is used. It is

stated as q in relation to the heat input Q
3.16
water side resistance

pressure loss across the boiler measured at the flow and return connections of the boiler, with a volume flow

corresponding to the nominal heat output
3.17
control thermostat

device enabling the water temperature to be kept automatically, within a given range, at a predetermined value

3.18
safety temperature limiter

device that causes safety shutdown and non-volatile lockout so as to prevent the water temperature exceeding a

pre-set limit
4 Requirements
4.1 Construction requirements
4.1.1 General requirements

Boilers shall be fire-resistant and safe to operate. They shall be made of non-combustible materials and shall be

resistant to deformation and shall be such that:

 they can withstand the stresses arising during normal operation and hydraulic tests;

 the burner and the boiler cannot become heated or pressurised to create a hazard;

 dangerous accumulations of combustible gases (fuels mixed with air) in the combustion chamber and in the

flues are prevented and
 gases cannot leak from the boiler in dangerous quantities;
 thermal insulation; only asbestos-free materials are allowable.
Combustible materials are allowable for:

 components of accessories e. g. burner covers, if the parts are fitted outside of the boiler;

 internal components of controls and safety equipment;
 operating handles;
 electrical equipment.
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SIST EN 14394:2006
EN 14394:2005 (E)

Component parts of covers, operating, control and safety devices and electrical accessories shall be arranged in such

a way that their surface temperatures, under steady state conditions, do not exceed those specified either by the

manufacturer or in the component part standard.

The materials for the parts subject to pressure shall be in accordance with generally accepted technical requirements.

They shall be suitable for the purpose and treatment intended. The mechanical and physical properties as well as the

chemical composition of the materials shall be guaranteed by the relevant material producer/supplier.

4.1.2 Production documentation
4.1.2.1 Drawings

The following shall be specified in the boiler drawings or in the relevant documents:

 specified materials;

 welding process, the weld type (generally the symbol for the weld type is sufficient) and the welding fillers;

 maximum allowable operating temperature in °C;
 maximum allowable operating pressure in bar;
 test pressure in bar;
 nominal heat output or the heat output range for every boiler size in kW.
4.1.2.2 Manufacturing controls
Manufacturing control shall be carried out.
4.1.3 Heating boilers of steel and of non-ferrous materials
4.1.3.1 Execution of welding work

Boiler manufacturers who carry out welding work shall meet the following requirements of EN 287–1 and EN ISO

9606-2:

 only welders who are qualified in the welding of the materials to be processed may be used;

 equipment shall be available to allow defect free welding to be carried out;

 supervision of the welding shall be carried out by staff qualified in welding (at least one supervisor shall be so

qualified).
4.1.3.2 Welded joints and welding fillers

The materials shall be suitable for welding. The materials in accordance with Clause 5 are suitable for welding and do

not require additional heat treatment after welding.

The welding procedure shall be in accordance with EN ISO 15607, EN ISO 15609-1, EN ISO 15614-1, EN ISO

15614-2, EN ISO 15610, EN ISO 15611, EN ISO 15612, EN ISO 15613 and EN 288-9.

The welded joints shall not show any cracks or bonding faults and shall be defect free over the whole cross-section for

butt welds. One-sided fillet welds, and half Y-welds which have been welded through, shall be kept substantially free

from bending stresses. Smoke tubes, inserted stays and similar components need not be counterwelded. Double fillet

welds are only permissible when sufficiently cooled. Projections into the flue gas side in areas of high thermal

stresses shall be avoided.

Corner welds, edge welds and similar welded connections which are subjected to high bending stresses during

production and operation are to be avoided.
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SIST EN 14394:2006
EN 14394:2005 (E)

For welded longitudinal stay bars or stay tubes the shearing cross section of the fillet weld should be at least

1,25 times the required stay bar or stay tube cross sectional area.

See Table 1 for details on the welding joints mentioned. Welding fillers shall be suitable for the material being used.

The terms used in Table 1 are in accordance with EN 22553. The reference numbers of welding processes are in

accordance with ISO 857-1 and EN ISO 4063.
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SIST EN 14394:2006
EN 14394:2005 (E)
Table 1 −−−− Weld joints and welding processes
No. Term Material Welding Remarks
thick- process
ness
t in mm
1.1 Square butt weld
one side
135 Permissible up to t = 8 mm on
≤ 6
12 use of deep penetration
(8)
131 electrodes or welding on both
(111) sides
both sides
1.2 Square butt weld
Root gap b = 2 mm to 4 mm with
≥ 6
stiffener, powder holder
up to 12
necessary
1.3 Square butt weld (double)
> 8 135 Root gap b = 2 mm to 4 mm
up to 12 12 Deep penetration electrodes
shall be used for manual electro
(111)
welding
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SIST EN 14394:2006
EN 14394:2005 (E)
Table 1 (continued)
No. Term Material Welding Remarks
thick- process
ness
t in mm
1.4 Single-V butt weld
up to 12 (111)
Weld preparation V-seam 60°
1.5 Single-V butt weld
135
Weld preparation V-seam 30° to
50° depending on thickness of
up to 12
material
a) 30 ° to 50 °
1.6 Double-V butt weld
greater 135 Weld preparation double V-seam
than 12
30° to 50° depending on material
thickness
a) 30 ° to 50 °
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SIST EN 14394:2006
EN 14394:2005 (E)
Table 1 (continued)
No. Term Material Welding Remarks
thick- process
ness
t in mm
1.7 Butt weld between plates with raised edges
135 Only permissible in exceptional
≤ 6
cases for parts welded in.
141
Moreover, the welds have to be
131
kept largely free from bending
stresses. Not suitable for directly
(111)
fired wall parts s = 0,8 t
2 Fillet weld
135 Welds of this type are to be kept
largely free from bending stresses
12 a = t
≤ 6
(111)
2.1 Double fillet weld
135 a = t
≤ 12
(111)
> 12 135 a = 2/3 t
(111)
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SIST EN 14394:2006
EN 14394:2005 (E)
Table 1 (continued)
No. Term Material Welding Remarks
thick- process
ness
t in mm
2.2 Double-bevel butt weld
135 A = t
≤ 12
(111)
> 12 135 a = 2/3 t
(111)
2.3 Single-bevel butt weld
135
≤ 12 For (111) β = 60°
(111)
> 12 135
For 135, 12 β = 45° to 50°
2.4 Single-bevel butt weld
135
≤ 12 For (111) β = 60°
For 135, 12 β = 45° to 50°
(111)
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SIST EN 14394:2006
EN 14394:2005 (E)
Table 1 (continued)
No. Term Materia Welding Remarks
l thick- process
ness
t in mm
2.5
≤ 12 135 Tube end shall not project beyond
fillet weld if it is subjected to heat
radiation
(111)
2.6
≤ 6 135 Welding in of tube under high
thermal stress a ≥ t
(111)
---------------------- Page: 17 ----------------------
SIST EN 14394:2006
EN 14394:2005 (E)
Table 1 (continued)
No. Term Materia Welding Remarks
l thick- process
ness
t in mm
2.7
135 Welding in of tube under high
thermal stress
(111)
For (111) β = 60°
For 135 β = 45° to 50°

Reference numbers of welding processes in accordance with ISO 857-1 or EN ISO 4063.

Reference number Process
12 Submerged arc welding
111 Metal-arc welding with covered electrode
131 Metal-arc inert gas welding; MIG welding
135 Metal-arc-active gas welding; MAG welding
141 Tungsten inert gas arc welding; TIG welding
5 Materials
5.1 General

The materials for heating boilers shall be manufactured and tested in accordance with the generally recognised

rules. The specification of the materials shall have an inspection certificate EN 10204:2004, 3.1; a test report 2.2

according to EN 10204 may be sufficient for boilers with TS < 110 °C. This does not apply to small components,

e.g. sockets up to DN 50, screws and nuts.

Other materials are only permissible on production of evidence showing equivalent performance. Comprehensive

test specifications, e.g. impact test, shall be considered by the particular material appraisal.

A method of material traceability shall be taken into account. Suitable procedures shall be established and

maintained for identifying the material making up the components of the heating boiler which contribute to pressure

resistance by suitable means from receipt, through production, up to the final test of the manufactured heating

boiler.
---------------------- Page: 18 ----------------------
SIST EN 14394:2006
EN 14394:2005 (E)
5.2 Steel boiler

5.2.1 The following plates and forgings from carbon steels according to EN 10025-1 to -3 should apply within the

following limits:
 grade S 235 JRG 2 for wall thickness up to 20 mm.

A particular material appraisal is required to confirm that the material has sufficient ductility for the application.

These grades are only permitted for a max. temperature of 300 °C to determine from the reference temperature

and the temperature allowance according to Table 5.

These grades are not applicable for flame tubes and other similar components in contact with fire for steam boilers

with an allowable operating pressure greater than 6 bar.

5.2.2 The following plates from carbon steels according to EN 10028-2 should apply within the following limits:

 grade P 235 GH, P 265 GH and P 295 GH.

These grades apply for heated cylindrical shells under external pressure (flame tubes) for wall thickness up to

22 mm and for heated straight wall thickness up to 25 mm.
5.2.3 For tubes, see EN 10216-1 to EN 10216-5 (seamless steel tub
...

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