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 design, manufacturing, safe operation and the rational energy usage for standard boilers and low temperature boilers (with "boiler" in the sense of "boiler body") from steel and cast iron to be equipped with separately marketed forced draught burners according to the relevant burner standards (for automatic forced draught burners for gaseous fuels see EN 676 and 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."
This European Standard specifies requirements for boilers with normal operating temperatures between 100 °C and 110 °C and has a "dual structure":
-   For boilers where the shut off temperature of the safety temperature limiter does not exceed 110 °C the Pressure Equipment Directive (PED) requires" Sound Engineering Practice",
-   For boilers where the shut off temperature of the safety temperature limiter exceeds 110 °C this European Standard specifies the requirements of the PED as stated in Annex ZB.
NOTE 1   The "maximum allowable temperature TS" is defined in the PED and its Guidelines."
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 !EN 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 2 Definitions for standard boiler and low temperature boiler see Council Directive 92/42/EEC."

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

Diese Europäische Norm legt die Anforderungen und Prüfverfahren für den Aufbau, die Fertigung, die sichere Bedienung und den rationellen Energieverbrauch für Standardheiz- und Niedertemperaturkessel (wobei 'Heiz¬kessel' im Sinne von 'Heizkessel-Körper' verstanden wird) aus Stahl und Gusseisen fest, die mit separat erhältlichen Gebläsebrennern nach den entsprechenden Normen für Brenner (für automatische Brenner mit Gebläse für gasförmige Brennstoffe siehe EN 676 und für Ölzerstäubungsbrenner siehe EN 267) bis zu einer Nennwärme-Leistung von 10 MW ausgestattet sind. Sie sind nach den Anweisungen des Kesselherstellers entweder mit Unterdruck (Naturzugkessel) oder mit Überdruck (Überdruckkessel) im Brennraum zu betreiben.
Diese Europäische Norm legt die Anforderungen für Heizkessel mit normalen Betriebstemperaturen zwischen 100 °C und 110 °C fest und weist eine 'duale Struktur' auf:
   für Heizkessel, bei denen die Abschalt-Temperatur des Sicherheitstemperaturbegrenzers 110 °C nicht überschreitet, fordert die Druckgeräte-Richtlinie (PED) gute Ingenieurpraxis;
   für Heizkessel, bei denen die Abschalt-Temperatur des Sicherheitstemperaturbegrenzers mehr als 110 °C beträgt, legt diese Europäische Norm die Anforderungen nach der PED fest, wie in Anhang ZB angegeben.
ANMERKUNG 1   Die maximal zulässige Temperatur TS ist in der PED und deren Leitlinien definiert."
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.

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 les méthodes d’essai pour la conception, la fabrication, la sécurité et l’utilisation rationnelle de l’énergie pour des chaudières standard et des chaudières à basse température («chaudière» au sens de «corps de chaudière») en acier et en fonte, devant être équipées de brûleurs à air soufflé commercialisés séparément, conformes aux normes applicables aux brûleurs (pour les brûleurs automatiques à air soufflé pour combustibles gazeux, voir l’EN 676 et pour les brûleurs à fioul à pulvérisation, voir l’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), soit en pression (chaudières pressurisées) dans la chambre de combustion."
!La présente Norme européenne spécifie les exigences relatives aux chaudières dont la température normale de service est comprise entre 100 °C et 110 °C ; elle est structurée en «deux volets» :
   Pour les chaudières dont la température de coupure du thermostat limiteur de sécurité ne dépasse pas 110 °C, la directive relative aux équipements sous pression (DEP) exige l’application des «règles de l’art en usage»,
   Pour les chaudières dont la température de coupure du thermostat limiteur de sécurité est supérieure à 110 °C, la présente Norme européenne spécifie les exigences de la DEP indiquées dans l’Annexe ZB.
NOTE 1   La «température maximale autorisée TS» est définie dans la DEP et ses Lignes directrices."
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.

Kotli za gretje - Kotli z ventilatorskimi gorilniki - Imenska grelna moč do vključno 10 MW in najvišja delovna temperatura 110 °C (vključno z dopolnilom A1)

General Information

Status
Published
Publication Date
19-Nov-2008
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
05-Nov-2008
Due Date
10-Jan-2009
Completion Date
20-Nov-2008

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Heizkessel - Heizkessel mit Gebläsebrennern - Nennwärmeleistung kleiner oder gleich 10 MW und einer maximalen Betriebstemperatur von 110 °CChaudières de chauffage - Chaudières avec brûleurs à air soufflé - Puissance utile inférieure ou égale à 10 MV et température maximale de service de 110 °CHeating boilers - Heating boilers with forced draught burners - Nominal heat output not exceeding 10 MW and maximum operating temperature of 110 °C91.140.10Sistemi centralnega ogrevanjaCentral heating systemsICS:Ta slovenski standard je istoveten z:EN 14394:2005+A1:2008SIST EN 14394:2006+A1:2008en,fr,de01-december-2008SIST EN 14394:2006+A1:2008SLOVENSKI

STANDARD
SIST EN 14394:2006+A1:2008
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14394:2005+A1
August 2008 ICS 01.040.91; 91.140.10 Supersedes EN 14394:2005 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 soufflé - Puissance utile inférieure ou égale à 10 MW et température maximale de service de 110 °C

Heizkessel - Heizkessel mit Gebläsebrennern - Nennwärmeleistung kleiner oder gleich 10 MW und einer maximalen Betriebstemperatur von 110 °C This European Standard was approved by CEN on 14 October 2005 and includes Amendment 1 approved by CEN on 28 June 2008.

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 CEN 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 CEN Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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 © 2008 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14394:2005+A1:2008: ESIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 2 Contents Page Foreword......................................................................................................................................................................3 1 Scope..............................................................................................................................................................4 2 Normative references....................................................................................................................................4 3 Terms and definitions...................................................................................................................................7 4 Requirements.................................................................................................................................................8 5 Materials.......................................................................................................................................................17 6 Design...........................................................................................................................................................20 7 Tests..............................................................................................................................................................30 8 Performance requirements.........................................................................................................................33 9 Technical documentation...........................................................................................................................35 Annex A (normative)

Cylindrical shells under internal pressure.........................................................................39 Annex B (normative)

Spherical shells and dished heads under internal and external pressure.....................66 Annex C (normative)

Dished fire tube heads.........................................................................................................93 Annex D (normative)

Flat walls, stayings and girder stays..................................................................................97 Annex E (normative)

Cylindrical shells under external pressure......................................................................116 Annex F (informative)

Pressure Equipment Directive 97/23/EC.........................................................................125 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.............................................................................................................126 Annex ZB (informative)

!!!!Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC concerning pressure equipment (PED)""""..........................127 Bibliography............................................................................................................................................................129

SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 3 Foreword This document (EN 14394:2005+A1:2008) 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 February 2009 and conflicting national standards shall be withdrawn at the latest by February 2009. This document includes Amendment 1 approved by CEN on 2008-06-28. The start and finish of text introduced or altered by amendment is indicated in the text by tags ! ". This document supersedes EN 14394:2005. According to edition 2005 the following fundamental changes are given:

— Consideration of the Directive 97/23/EC Pressure Equipment Directive (PED) and including of Annex ZB;

— Correction of some typing errors. This document 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 Directives. !For relationship with EU Directives, see informative Annexes ZA and ZB, which are integral parts of this document." !The requirements and test methods related to the Essential Requirements of the Council Directive 90/396/EEC relating to appliances burning gaseous fuels (Gas Appliance Directive – GAD) for assemblies made up of a boiler body complying with EN 303-1 and a forced draught gas burner complying with EN 676 with a nominal heat output not exceeding 1.000 kW are covered in the Harmonized European Standard EN 303-3:1998 and its Amendment A2:2004. For assemblies with a heat output between 1.000 kW and 10 MW however no Harmonized European Standard does exist at the moment. The relevant clauses of EN 303-3:1998 can be taken as a basis to prove conformity with the essential requirements of the GAD." 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). According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 4

1 Scope !This European Standard specifies the requirements and test methods for the design, manufacturing, safe operation and the rational energy usage for standard boilers and low temperature boilers (with „boiler" in the sense of „boiler body") from steel and cast iron to be equipped with separately marketed forced draught burners according to the relevant burner standards (for automatic forced draught burners for gaseous fuels see EN 676 and 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." !This European Standard specifies requirements for boilers with normal operating temperatures between 100 °C and 110 °C and has a "dual structure": • For boilers where the shut off temperature of the safety temperature limiter does not exceed 110 °C the Pressure Equipment Directive (PED) requires" Sound Engineering Practice",

• For boilers where the shut off temperature of the safety temperature limiter exceeds 110 °C this European Standard specifies the requirements of the PED as stated in Annex ZB. NOTE 1 The "maximum allowable temperature TS" is defined in the PED and its Guidelines." 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 !EN 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 2 Definitions for standard 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 !deleted text" 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 303-3, Heating boilers - Part 3: Gas-fired central heating boilers - Assembly comprising a boiler body and a forced draught burner" SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 5 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 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 SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 6 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) 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 6506-1:2005)" 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 — Welding procedure specification — 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 SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 7 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 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 !!!!Pn"""" 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 QB 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 Hi 3.8 boiler efficiency !!!!K"""" ratio of the nominal output (Pn) to the heat input (QB) supplied by the fuel BnKQP=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 SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 8 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 tA temperature measured at the flue outlet of the boiler 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 qB quantity of heat which is necessary to maintain the boiler at a given temperature when no heat output is used. It is stated as qB in relation to the heat input QB. 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: SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 9  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. 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 and EN ISO 15613 !deleted text". SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 10 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. 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. SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 11 Table 1 −−−− Weld joints and welding processes No. Term Material thick-ness t in mm Welding process a

Remarks 1.1 Square butt weld
one side
both sides
≤ 6
(8)
135 12 131 (111)

Permissible up to t = 8 mm on use of deep penetration electrodes or welding on both sides 1.2 Square butt weld

6 up to 12
Root gap b =

2 mm to 4 mm with stiffener, powder holder necessary 1.3 Square butt weld (double)

8 up to 12
135 12 (111)

Root gap b = 2 mm to 4 mm Deep penetration electrodes shall be used for manual electro welding SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 12
Table 1 (continued) No. Term Material thick-ness t in mm Welding process a
Remarks 1.4 Single-V butt weld
up to 12
(111)
Weld preparation V-seam 60° 1.5 Single-V butt weld
a) 30 ° to 50 °
up to 12
135 12

Weld preparation V-seam 30° to 50° depending on thickness of material 1.6 Double-V butt weld

a) 30 ° to 50 °
greater than 12
135 12
Weld preparation double V-seam 30° to 50° depending on material thickness
SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 13 Table 1 (continued) No. Term Material thick-ness t in mm Welding process a

Remarks 1.7 Butt weld between plates with raised edges
≤ 6
135 141 131 (111)

Only permissible in exceptional cases for parts welded in. Moreover, the welds have to be kept largely free from bending stresses. Not suitable for directly fired wall parts s = 0,8 t 2 Fillet weld

≤ 6
135 12 (111)
Welds of this type are to be kept largely free from bending stressesa = t
≤ 12
135 12 (111)
a = t 2.1 Double fillet weld
> 12 135 12 (111) a = 2/3 t SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 14 Table 1 (continued) No. Term Material thick-ness t in mm Welding process a

Remarks
≤ 12
135 12 (111)
A = t 2.2 Double-bevel butt weld
> 12 135 12 (111)
a = 2/3 t
≤ 12
135 12 (111)
For (111) β = 60° 2.3 Single-bevel butt weld
> 12 135 12 For 135, 12 β = 45° to 50° 2.4 Single-bevel butt weld
≤ 12
135 12 (111)
For (111) β = 60° For 135, 12 β = 45° to 50° SIST EN 14394:2006+A1:2008
EN 14394:2005+A1:2008 (E) 15

Table 1 (continued) No. Term Material thick-ness t in mmWelding process a Remarks 2.5

≤ 12
135
(111)

Tube end shall not project beyond fillet weld if it is subjected to heat radiation 2.6

≤ 6
135 (111)
Welding in of tube under high thermal stress a ≥ t SIST EN 14394:2006+A1:2008
EN 14394:2005+A1:2008 (E) 16

Table 1 (continued) No. Term Material thick-ness t in mmWelding process a Remarks 2.7

135 (111)

Welding in of tube under high thermal stress 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 12 111 131 135 141 Submerged arc welding Metal-arc welding with covered electrode Metal-arc inert gas welding; MIG welding Metal-arc-active gas welding; MAG welding Tungsten inert gas arc welding; TIG welding

4.2 !!!!Burner matching 4.2.1 Matching with forced draught oil burner according to EN 267 - The requirements according to EN 303-2 have to be met, or

in case of nominal heat input exceeds the range of the scope according to EN 303-2, - the tests according EN 303-2 have to be carried out. 4.2.2 Matching with automatic forced draught burner for gaseous fuels according to EN 676 - The requirements according to EN 303-3 have to be met, or in case of nominal heat input exceeds the range of the scope according to EN 303-3, - the tests according to EN 303-3 have to be carried out."

SIST EN 14394:2006+A1:2008

EN 14394:2005+A1:2008 (E) 17 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.

5.2 Steel boiler 5.2.1 The following plat
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