SIST EN 14394:2006
(Main)Heating boilers - Heating boilers with forced draught burners - Nominal heat output not exceeding 10 MW and maximum operating temperature of 110 °C
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.
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
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 chaudieres de chauffage (chaudieres standard et chaudieres basse température) alimentées en combustibles liquides, en acier et en fonte, avec des bruleurs conformes aux normes applicables aux bruleurs (pour des bruleurs a pulvérisation, voir la norme EN 267) jusqu'a une puissance utile nominale de 10 MW. Ces chaudieres fonctionnent, selon les instructions du fabricant, soit en dépression (a tirage naturel) ou en pression (chaudieres pressurisées) dans la chambre de combustion.
Les chaudieres conformes a 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 a 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 chaudieres a gaz a bruleur atmosphérique, aux chaudieres pour combustibles solides, aux chaudieres a condensation a gaz ou au fioul, aux chaudieres a bruleur fioul a caléfaction. Il existe d'autres exigences complémentaires pour ces chaudieres.
Pour des chaudieres de chauffage central utilisant des combustibles gazeux équipées de bruleurs a air soufflé dont la puissance utile nominale ne dépasse pas 1 000 kW, voir la prEN 303-7.
Pour des chaudieres a 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 chaudiere de chauffage et chaudiere a 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
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 14394:2006
01-februar-2006
.RWOL]DJUHWMH±.RWOL]YHQWLODWRUVNLPLJRULOQLNL±,PHQVNDJUHOQDPRþGRYNOMXþQR
0:LQQDMYLãMDGHORYQDWHPSHUDWXUDƒ&
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.
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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
2
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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.
3
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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
4
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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)
5
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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
6
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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
N
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
B
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
i
3.8
boiler efficiency ηηηη
ratio of the nominal output (P ) to the heat input (Q ) supplied by the fuel
n B
P
n
η =
K
Q
B
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
A
temperature measured at the flue outlet of the boiler
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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
B
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
B
B.
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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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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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.
10
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Table 1 −−−− Weld joints and welding processes
No. Term Material Welding Remarks
a
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
12
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
11
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EN 14394:2005 (E)
Table 1 (continued)
No. Term Material Welding Remarks
a
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
12
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
12
thickness
a) 30 ° to 50 °
12
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EN 14394:2005 (E)
Table 1 (continued)
No. Term Material Welding Remarks
a
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
12
(111)
> 12 135 a = 2/3 t
12
(111)
13
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Table 1 (continued)
No. Term Material Welding Remarks
a
thick- process
ness
t in mm
2.2 Double-bevel butt weld
135 A = t
≤ 12
12
(111)
> 12 135 a = 2/3 t
12
(111)
2.3 Single-bevel butt weld
135
≤ 12 For (111) β = 60°
12
(111)
> 12 135
For 135, 12 β = 45° to 50°
12
2.4 Single-bevel butt weld
135
≤ 12 For (111) β = 60°
12
For 135, 12 β = 45° to 50°
(111)
14
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EN 14394:2005 (E)
Table 1 (continued)
No. Term Materia Welding Remarks
a
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)
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SIST EN 14394:2006
EN 14394:2005 (E)
Table 1 (continued)
No. Term Materia Welding Remarks
a
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°
a
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.
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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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