SIST EN 497:2022

Specification for dedicated liquefied petroleum gas appliances - Multi purpose boiling burners for outdoor use

This standard specifies the constructional and performance characteristics, safety specifications and rational use of energy, relevant test methods and marking of burners burning liquefied petroleum gas and designed to heat up vessels of diameter greater than 300 mm, containing liquids or food. This standard overs appliances, generally floor standing, fitted with one or several open burners without enclosure, designed to be used outdoors and operating with the gases corresponding to the categories indicated in 4.

Festlegungen für Flüssiggasgeräte - Flüssiggasbetriebene Mehrzweckkochgeräte zur Verwendung im Freien

Dieses Dokument legt die Konstruktions- und Leistungsmerkmale, die Sicherheitsanforderungen und die wirtschaftliche Energieverwendung sowie die entsprechenden Prüfmethoden und Kennzeichnung von Brennern, die mit Flüssiggas betrieben werden und zum Erwärmen von Behältern mit einem Durchmesser von mehr als 300 mm bestimmt sind, die Flüssigkeiten oder Lebensmittel enthalten, fest.
Sie werden im gesamten Text als „Geräte“ bezeichnet.
Dieses Dokument behandelt die in der Regel auf einem Boden stehende Geräte, die mit einem oder mehreren offenen Brennern ausgestattet sind, die für die Verwendung im Freien ausgelegt sind und mit Gasen betrieben werden, die den unter Abschnitt 4 festgelegten Kategorien entsprechen.
Dieses Dokument ist nicht anzuwenden für Geräte, die mit Gasen der 3. Gasfamilie bei einem Druck größer als in Abschnitt 4 beschrieben, betrieben werden.
Durch dieses Dokument sind nur Geräte abgedeckt, die nicht an Abgasleitungen der Verbrennungsprodukte und nicht an das elektrische Netz angeschlossen sind.
Geräte mit einer Nennwärmebelastung von weniger als 1,16 kW unterliegen aufgrund ihrer geringen Leistung keinen Anforderungen an eine wirtschaftliche Energieverwendung.
Bei Geräten mit mehreren konzentrischen Brennern sind Brenner mit einem Durchmesser von mehr als 56 cm aus Sicherheitsgründen aufgrund der Handhabung des Behälters nicht Gegenstand jeglicher Anforderungen an eine wirtschaftliche Energieverwendung.
Dieses Dokument behandelt keine LPG-Flüssiggasbehälter, die dazugehörigen Regelgeräte, Rohre und biegsamen Anschlussschlauchleitungen, die für die Gasversorgung der von in diesem Dokument erfassten Geräte verwendet werden.
ANMERKUNG    Regelgeräte, Schlauchleitungen und biegsame Anschlussschläuche unterliegen anderen Normen (EN 16129, EN 16436 1+A3 und EN 16436 2 usw.) und nationalen Vorschriften.

Spécifications pour les appareils fonctionnant exclusivement aux gaz de pétrole liquéfiés - Brûleurs à usages multiples

Le présent document précise les caractéristiques de construction et de fonctionnement ainsi que les spécifications de sécurité et d'utilisation rationnelle de l'énergie, les méthodes d'essai afférentes et le marquage des brûleurs fonctionnant aux gaz de pétrole liquéfiés et destinés à chauffer des récipients d'un diamètre supérieur à 300 mm contenant des liquides ou des aliments.
Ils sont désignés dans l'ensemble du texte par « appareils ».
Le présent document s'applique aux appareils, reposant en général sur le sol, comportant un ou plusieurs brûleurs découverts, destinés à être utilisés en plein air et fonctionnant avec les gaz correspondant aux catégories indiquées en 4.
Les appareils alimentés avec les gaz de la troisième famille à des pressions autres que celles définies en 4, sont exclus du domaine d'application du présent document.
Les appareils objets du présent document ne sont pas raccordés à un conduit d'évacuation des produits de la combustion et ne sont pas raccordés au réseau électrique.
Les appareils de débit calorifique nominal inférieur à 1,16 kW ne sont pas soumis aux exigences d'utilisation rationnelle de l'énergie, compte tenu de leur faible puissance.
Pour les appareils munis de multiples brûleurs concentriques, les brûleurs de plus de 56 cm de diamètre ne sont pas soumis aux exigences d'utilisation rationnelle de l'énergie pour des raisons de sécurité liées à la manipulation du récipient.
Le présent document ne couvre pas les récipients de gaz de pétrole liquéfié (GPL), ainsi que les détendeurs, tuyaux et tubes souples associés qui sont utilisés pour l'alimentation en gaz des appareils couverts par le présent document.
NOTE   Les détendeurs, tuyaux et tubes souples sont couverts par d'autres normes (EN 16129, EN 16436 1+A3 et EN 16436 2, etc.) et les réglementations nationales.

Specifikacija za plinske aparate na utekočinjeni naftni plin - Večnamenski kuhalni aparati za zunanjo uporabo

Ta standard določa značilnosti izvedbe in delovanja, varnostne specifikacije in racionalno rabo energije, ustrezne preskusne metode in označevanje gorilnikov na utekočinjen naftni plin, namenjenih za ogrevanje posod s premerom nad 300 mm, ki vsebujejo tekočino ali hrano. Standard zajema naprave, običajno stoječe na tleh in opremljene z enim ali več odprtimi gorilniki brez ohišja, ki so namenjene za uporabo na prostem in ki pri delovanju uporabljajo pline, ki ustrezajo kategorijam, navedenim v 4. točki.

General Information

• Status: Published
• Public Enquiry End Date: 02-Feb-2020
• Publication Date: 18-Aug-2022
• Withdrawal Date: 02-Aug-2022
• ICS: 97.040.20 - Cooking ranges, working tables, ovens and similar appliances
• Technical Committee: PLN - Gas appliances for domestic use
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 03-Aug-2022
• Due Date: 08-Oct-2022
• Completion Date: 19-Aug-2022
• Mandate: M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels
• Ref Project: EN 497:2022 - Specification for dedicated liquefied petroleum gas appliances - Multi purpose boiling burners for outdoor use - Cooking vessels with a diameter greater than 300 mm

Relations

• Replaces: SIST EN 497:1997 - Specification for dedicated liquefied petroleum gas appliances - Multi purpose boiling burners for outdoor use
• Effective Date: 01-Sep-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 497:2022
01-september-2022
Nadomešča:
SIST EN 497:1997
Specifikacija za plinske aparate na utekočinjeni naftni plin - Večnamenski kuhalni
aparati za zunanjo uporabo
Specification for dedicated liquefied petroleum gas appliances - Multi purpose boiling
burners for outdoor use
Festlegungen für Flüssiggasgeräte - Flüssiggasbetriebene Mehrzweckkochgeräte zur
Verwendung im Freien
Spécifications pour les appareils fonctionnant exclusivement aux gaz de pétrole liquéfiés
- Brûleurs à usages multiples
Ta slovenski standard je istoveten z: EN 497:2022
ICS:
97.040.20 Štedilniki, delovni pulti, Cooking ranges, working
pečice in podobni aparati tables, ovens and similar
appliances
SIST EN 497:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 497:2022

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SIST EN 497:2022


EN 497
EUROPEAN STANDARD

NORME EUROPÉENNE

June 2022
EUROPÄISCHE NORM
ICS 97.040.20 Supersedes EN 497:1997
English Version

Specification for dedicated liquefied petroleum gas
appliances - Multi purpose boiling burners for outdoor use
- Cooking vessels with a diameter greater than 300 mm
Spécifications pour les appareils fonctionnant Festlegungen für Flüssiggasgeräte -
exclusivement aux gaz de pétrole liquéfiés - Brûleurs à Flüssiggasbetriebene Mehrzweckkochgeräte zur
usages multiples, avec supports intégrés, utilisés en Verwendung im Freien
plein air - Récipients de cuisson avec un diamètre
supérieur à 300 mm
This European Standard was approved by CEN on 26 December 2021.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.





EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 497:2022 E
worldwide for CEN national Members.

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SIST EN 497:2022
EN 497:2022 (E)
Contents
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Classification .11
4.1 Classification of gases used .11
4.2 Classification of appliances .11
5 Constructional characteristics .12
5.1 Conversion to different gases .12
5.2 Materials .12
5.3 Ease of cleaning .12
5.4 Strength .13
5.5 Assembly .13
5.6 Stability of the appliance .13
5.6.1 Stability of the appliance on a horizontal surface .13
5.6.2 Stability of the appliance placed on a slope .13
5.6.3 Vessel stability .13
5.7 Construction of the gas circuit assembly .13
5.8 Connections .14
5.9 Blocking of wheels and castors .14
5.10 Taps .14
5.11 Control handles .15
5.11.1 Construction .15
5.11.2 Marking .15
5.12 lnjectors .16
5.13 Ignition devices .16
5.14 Flame supervision devices .16
5.15 Burners .16
5.16 Appliance incorporating a gas container .17
5.17 Appliances with compartment .17
6 Performance characteristics .18
6.1 Soundness .18
6.2 Verification of the nominal heat input .18
6.3 Flame supervision devices .18
6.4 Safety of operation .18
6.4.1 Ignition, crosslighting .18
6.4.2 Flame stability .18
6.4.3 Resistance to draught .18
6.4.4 Resistance to overheating .18
6.5 Temperatures .19
6.6 Combustion .20
6.7 Sooting.20
6.8 Rational use of energy .20
6.9 Durability of markings on the appliance .20
6.10 Overheating of the gas container .20
7 Test methods .21
2

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SIST EN 497:2022
EN 497:2022 (E)
7.1 General . 21
7.1.1 Test gases . 21
7.1.2 Test pressures. 22
7.1.3 Test conditions . 22
7.1.4 Characteristics of the test vessel . 22
7.2 Verification of the constructional characteristics . 23
7.2.1 Conversion to different gases . 23
7.2.2 Materials . 23
7.2.3 Ease of cleaning . 23
7.2.4 Strength . 23
7.2.5 Assembly . 23
7.2.6 Stability of the appliance . 23
7.2.7 Durability of markings. 24
7.3 Verification of the performance characteristics . 24
7.3.1 Soundness . 24
7.3.2 Nominal heat input . 24
7.3.3 Flame supervision device . 25
7.3.4 Safety of operation . 25
7.3.5 Temperatures . 26
7.3.6 Combustion . 27
7.3.7 Sooting . 28
7.3.8 Rational use of energy. 28
7.3.9 Overheating of the gas container . 29
8 Marking . 30
8.1 Appliance marking . 30
8.2 Packaging marking. 30
8.3 Instructions for installation, assembly, use and maintenance . 30
Annex A (informative) National situations . 35
A.1 General . 35
A.2 Categories marketed in the various countries and corresponding pressures . 35
A.3 Types of connection used in various countries . 37
A.4 Connection of appliances . 38
Annex B (normative) Method of calculation of the nominal heat input . 40
Annex C (normative) Composition of test gases . 42
Annex D (normative) Surface temperature probe . 43
D.1 Design . 43
D.2 Validation test . 43
D.2.1 Principle . 43
D.2.2 Procedure . 43
D.2.3 Validation . 44
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of Regulation (EU) 2016/426 aimed to be covered . 45
Bibliography . 48

3

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SIST EN 497:2022
EN 497:2022 (E)
European foreword
This document (EN 497:2022) has been prepared by Technical Committee CEN/TC 181 “Dedicated
liquefied petroleum gas appliances”, the secretariat of which is held by AFNOR.
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 December 2022, and conflicting national standards shall
be withdrawn at the latest by December 2023.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 497:1997.
The main changes with respect to the previous edition are listed below:
— Addition of a complementary element in the title for vessel of diameter greater than 300 mm
— Extension of the scope to paella burners
— Addition of requirements and tests for appliances with gas containers compartments
— Harmonization/correction of test pressures and test conditions
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with EU Directive(s) / Regulation(s), see informative Annex ZA, which is an integral part
of this document.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia,
Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland,
Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
4

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SIST EN 497:2022
EN 497:2022 (E)
1 Scope
This document specifies the constructional and performance characteristics, safety specifications and
rational use of energy, relevant test methods and marking of burners burning liquefied petroleum gas
and designed to heat up vessels of diameter greater than 300 mm, containing liquids or food.
They are referred to in the body of the text as “appliances”.
This document covers appliances, generally floor standing, fitted with one or several open burners,
designed to be used outdoors and operating with the gases corresponding to the categories indicated in
4.
Appliances supplied with third family gas at other pressures than those defined in 4 are outside the field
of application of this document.
Appliances covered by this document are not connected to a flue for the products of combustion and are
not connected to the mains electrical supply.
Appliances with a nominal heat input below 1,16 kW are not subject to any requirement concerning the
rational use of energy due to their low rate.
For appliance having multiple concentric burners, burners greater than 56 cm diameter are not subject
to any requirement concerning the rational use of energy for safety reasons due to handling of the vessel.
This document does not cover LPG containers for liquefied petroleum gas, their associated regulator,
tubing and flexible hoses used for gas supply of appliances covered by this document.
NOTE Regulator, tubing and flexible hoses are covered by other standards (EN 16129, EN 16436-1+A3 and
EN 16436-2, etc.) and national regulations.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 125:2010+A1:2015, Flame supervision devices for gas burning appliances - Thermoelectric flame
supervision devices
EN 126:2012, Multifunctional controls for gas burning appliances
EN 437:2021, Test gases - Test pressures - Appliance categories
EN 549:2019, Rubber materials for seals and diaphragms for gas appliances and gas equipment
EN 1106:2010, Manually operated taps for gas burning appliances
EN 10226-1:2004, 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 10226-2:2005, Pipe threads where pressure tight joints are made on the threads - Part 2: Taper external
threads and taper internal threads - Dimensions, tolerances and designation
EN 60584-1:2013, Thermocouples - Part 1: EMF specifications and tolerances
EN ISO 228-1:2003, Pipe threads where pressure-tight joints are not made on the threads - Part 1:
Dimensions, tolerances and designation (ISO 228-1:2000)
5

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SIST EN 497:2022
EN 497:2022 (E)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
multi-purpose boiling burner
one or several burners which are part of a structure ensuring both the support of burners and that of
vessels and generally used as floor standing appliance
Note 1 to entry: They incorporate one device (or devices) which ensures one set position of the burner (or
burners) in relation to the plane on which the appliance rests and to vessels. Figure 1 gives diagrams of this type of
appliance, for information.
3.2
appliance incorporating a gas container
appliance whose body or support includes a fixing or support device for a liquefied petroleum container
3.3
burner
component that allows the gas to burn
Note 1 to entry: It may be:
— non-aerated burner, in which the air for combustion is entrained entirely at the burner outlet;
— aerated burner, in which part of the air for combustion, termed primary air, is entrained by the gas flow
and mixed before the burner outlet. The remainder of the air, termed secondary air, is drawn in after the burner
outlet.
3.4
open burner
burner where the pans being heated are in direct contact with the flames
3.5
injector
component part that admits the gas into an aerated burner
Note 1 to entry: There are two types of injectors:
— calibrated injectors where the section of the outlet orifice is fixed;
— adjustable injectors where the section of the outlet orifice is variable
6

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SIST EN 497:2022
EN 497:2022 (E)
3.6
ignition device
device to ignite one or more burners directly or indirectly, for instance through a flash tube
Note 1 to entry: It may be:
— either electric (resistance, spark, etc.)
— or thermal (flame, pilot, etc.).
3.7
flame supervision device
device which, due to the presence of a flame on the sensing element, keeps open the gas flow to the burner
and pilot and which cuts off the gas supply to the burner and pilot in the case of extinction of the
supervised flame
3.8
detachable
which can be dismantled without using a tool
3.9
removable
which can only be removed with a tool
3.10
fittings
safety devices, controlling devices or regulating devices and sub-assemblies, incorporated into the
appliance
Note 1 to entry: For example: tap, flame supervision device, ignition device…
3.11
control handle
component designed to be operated manually so as to control the movement of a control of the appliance,
such as a tap, etc
3.12
gripping area
area of the appliance designed to be manipulated during normal use
3.13
tap
device designed to isolate a burner from the gas supply pipework and to adjust its rate during use
Note 1 to entry: There are two types of taps:
— Taps with marked positions: taps for which specific positions are presset (lighting, reduced rate, closed
position)
— Taps with variable positions: taps with a continuous setting without specific position
3.14
ignition delay time
time between the ignition of the flame supervised, the appliance being at room temperature, and the
moment when the effect of this flame is sufficient to keep the closing member open
7

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SIST EN 497:2022
EN 497:2022 (E)
3.15
extinction delay time
time which elapses between the extinction of the supervised flame and the closure of the gas supply
controlled by the flame supervision device
3.16
soft solder
solder for which the lowest temperature of the melting range, after application, is less than 450 °C
3.17
pan support
support placed above an open burner, and designed to support the pan being heated
3.18
reference conditions
conditions which correspond to 15 °C, 1 013, 25 mbar, unless otherwise specified
[SOURCE: EN 437:2021]
3.19
pressure couple
combination of two distinct gas distribution pressures applied by reason of the significant difference
existing between the Wobbe indices within a single family or group in which
— the higher pressure corresponds only to gases of low Wobbe index;
— the lower pressure corresponds to gases of high Wobbe index
Note 1 to entry: The pressure couple is indicated by using the symbol (⇆).
[SOURCE: EN 437:2021]
3.20
calorific value
quantity of heat produced by the complete combustion, at a constant pressure equal to 1 013,25 mbar, of
a unit volume or mass of gas, the constituents of the combustible mixture being taken at reference
conditions and the products of combustion being brought back to the same conditions
Note 1 to entry: A distinction is made between:
— the gross calorific value Hs: the water produced by combustion is assumed to be condensed;
— the net calorific value Hi: the water produced by combustion is assumed to be in the vapour state.
Note 2 to entry: The calorific value is expressed:
3
— either in megajoules per cubic metre (MJ/m ) of dry gas under the reference conditions;
— or in megajoules per kilogram (MJ/kg) of dry gas.
Note 3 to entry: For the purposes of this European Standard only the gross calorific value is used.
[SOURCE: EN 437:2021 modified with additional note 3]
8

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SIST EN 497:2022
EN 497:2022 (E)
3.21
heat input
Q
quantity of energy used in unit time corresponding to the volume flow rate or mass flow rate, the calorific
value used being either the net or gross calorific value
Note 1 to entry: The heat input is expressed in kilowatts (kW).
[SOURCE: EN 437:2021]
3.22
nominal heat input
Q
n
value of the heat input of the appliance declared in the instructions
Note 1 to entry: Adapted from EN 437:2021
3.23
mass flow rate
M
mass of gas consumed by the appliance in unit time during continuous operation
Note 1 to entry: The mass flow rate is expressed in kilograms per hour (kg/h) or grams per hour (g/h).
[SOURCE: EN 437:2021]
3.24
volume flow rate
V
volume of gas consumed by the appliance in unit time during continuous operation
3
Note 1 to entry: The volume flow rate is expressed in cubic metres per hour (m /h), litres per minute (l/min),
3 3
cubic decimetres per hour (dm /h) or cubic decimetres per second (dm /s).
[SOURCE: EN 437:2021]
3.25
relative density
d
ratio of the masses of equal volumes of dry gas and dry air under the same conditions of temperature and
pressure: 15 °C or 0 °C and 1 013, 25 mbar
[SOURCE: EN 437:2021]
9

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SIST EN 497:2022
EN 497:2022 (E)
3.26
wobbe index
gross Wobbe index
W ;
s
net Wobbe index
W
i
ratio of the calorific value of a gas per unit volume and the square root of its relative density under the
same reference conditions
Note 1 to entry: The Wobbe index is said to be gross (Ws) or net (Wi) according to whether the calorific value
used is the gross or net calorific value, respectively is used.
Note 2 to entry: The Wobbe index is expressed:
3
— either in megajoules per cubic metre (MJ/m ) of dry gas under the reference conditions;
— or in megajoules per kilogram (MJ/kg) of dry gas.
[SOURCE: EN 437:2021 modified to comply with CEN rules for definition wording]
3.27
stability of flames
condition of flames when the phenomena of flame lift or light back do not occur
3.28
flame lift
phenomenon characterized by the partial or total movement of the base of the flame away from the
burner port
3.29
sooting
phenomenon appearing during incomplete combustion and characterized by a deposit of carbon on
surfaces in con tact with the flame or the products of combustion
3.30
light back
phenomenon characterized by the return of the flame inside the body of the burner
10

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SIST EN 497:2022
EN 497:2022 (E)
4 Classification
4.1 Classification
...

SLOVENSKI STANDARD
oSIST prEN 497:2020
01-januar-2020
Specifikacija za plinske aparate na utekočinjeni naftni plin - Večnamenski kuhalni
aparati za zunanjo uporabo
Specification for dedicated liquefied petroleum gas appliances - Multi purpose boiling
burners for outdoor use
Festlegungen für Flüssiggasgeräte - Flüssiggasbetriebene Mehrzweckkochgeräte zur
Verwendung im Freien
Spécifications pour les appareils fonctionnant exclusivement aux gaz de pétrole liquéfiés
- Brûleurs à usages multiples
Ta slovenski standard je istoveten z: prEN 497
ICS:
97.040.20 Štedilniki, delovni pulti, Cooking ranges, working
pečice in podobni aparati tables, ovens and similar
appliances
oSIST prEN 497:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 497:2020

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oSIST prEN 497:2020


DRAFT
EUROPEAN STANDARD
prEN 497
NORME EUROPÉENNE

EUROPÄISCHE NORM

November 2019
ICS Will supersede EN 497:1997
English Version

Specification for dedicated liquefied petroleum gas
appliances - Multi purpose boiling burners for outdoor use
Spécifications pour les appareils fonctionnant Festlegungen für Flüssiggasgeräte -
exclusivement aux gaz de pétrole liquéfiés - Brûleurs à Flüssiggasbetriebene Mehrzweckkochgeräte zur
usages multiples Verwendung im Freien
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 181.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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-CENELEC
Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.


EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 497:2019 E
worldwide for CEN national Members.

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Contents Page
European Foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and Definitions . 6
4 Classification . 11
4.1 Classification of gases used . 11
4.2 Classification of appliances . 11
5 Constructional characteristics . 12
5.1 Conversion to different gases . 12
5.2 Materials . 12
5.3 Ease of cleaning . 12
5.4 Strength . 12
5.5 Assembly . 12
5.6 Stability of the appliance . 13
5.6.1 Stability of the appliance on a horizontal surface . 13
5.6.2 Stability of the appliance placed on a slope . 13
5.6.3 Vessel stability . 13
5.7 Construction of the gas circuit assembly . 13
5.8 Connections . 13
5.9 Blocking of wheels and castors . 14
5.10 Taps . 14
5.11 Control handles . 14
5.11.1 Construction . 14
5.11.2 Marking . 15
5.12 lnjectors . 15
5.13 Ignition devices . 15
5.14 Flame supervision devices . 16
5.15 Burners . 16
5.16 Appliance incorporating a gas container . 17
6 Performance characteristics . 17
6.1 Soundness . 17
6.2 Verification of the nominal heat input . 17
6.3 Flame supervision devices . 17
6.4 Safety of operation . 17
6.4.1 Ignition, crosslighting . 17
6.4.2 Flame stability . 17
6.4.3 Resistance to draught . 18
6.4.4 Resistance to overheating . 18
6.5 Temperatures . 18
6.6 Combustion . 19
6.7 Sooting. 19
6.8 Rational use of energy . 19
6.9 Durability of markings on the appliance . 19
7 Test methods . 19
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7.1 General . 19
7.1.1 Test gases . 19
7.1.2 Test pressures. 20
7.1.3 Test procedures . 20
7.1.4 Characteristics of the test vessel . 21
7.2 Verification of the constructional characteristics . 21
7.2.1 Conversion to different gases . 21
7.2.2 Materials . 21
7.2.3 Ease of cleaning . 21
7.2.4 Strength . 21
7.2.5 Assembly . 21
7.2.6 Stability of the appliance . 22
7.3 Verification of the performance characteristics . 22
7.3.1 Soundness . 22
7.3.2 Nominal heat input . 23
7.3.3 Flame supervision device . 23
7.3.4 Safety of operation . 23
7.3.5 Temperatures . 25
7.3.6 Combustion . 25
7.3.7 Sooting . 27
7.3.8 Rational use of energy. 27
8 Marking . 28
8.1 Appliance marking . 28
8.2 Packaging marking. 28
8.3 Instructions for installation, assembly, use and maintenance . 29
Annex A (Normative) National situations . 33
A.1 General . 33
A.2 Categories marketed in the various countries and corresponding pressures . 33
A.3 Types of connection used in various countries . 35
A.4 Connection of appliances . 37
Annex B (normative) Method of calculation of the nominal heat input. 39
Annex C (normative) Composition of test gases . 41
Annex D (normative) Surface temperature probe . 42
D.1 Design . 42
D.2 Validation test . 42
D.2.1 Principle . 42
D.2.2 Procedure . 42
D.2.3 Validation . 42
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of Regulation (EU) 2016/426 aimed to be covered . 44
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European Foreword
This document (prEN 497:2019) has been prepared by Technical Committee CEN/TC 181 “Dedicated
liquefied petroleum gas appliances”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
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 Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, B, C or D, which is an integral part of
this document.
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1 Scope
This document specifies the constructional and performance characteristics, safety specifications and
rational use of energy, relevant test methods and marking of burners burning liquefied petroleum gas
and designed to heat up vessels of diameter greater than 300 mm, containing liquids or food.
They are referred to in the body of the text as “appliances”.
This document covers appliances, generally floor standing, fitted with one or several open burners
without enclosure, designed to be used outdoors and operating with the gases corresponding to the
categories indicated in 4.
Appliances supplied with third family gas at other pressures than those defined in 4 are outside the
field of application of this document.
Appliances covered by this document are not connected to a flue for the products of combustion and are
not connected to the mains electrical supply.
Appliances with a nominal heat input below 1,16 kW are not subject to any requirement concerning the
rational use of energy due to their low rate.
For appliance having multiple concentric burners, burners greater than 56 cm diameter are not subject
to any requirement concerning the rational use of energy for safety reasons due to handling of the
vessel.
This document does not cover LPG containers for liquefied petroleum gas, their associated regulator,
tubing and flexible hoses used for gas supply of appliances covered by this document. Regulator, tubing
and flexible hoses are covered by other standards (EN 16129, EN 16436-1 and prEN 16436-2, etc.) and
national regulations.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 125:2010+A1:2015, Flame supervision devices for gas burning appliances - Thermoelectric flame
supervision devices
EN 126:2012, Multifunctional controls for gas burning appliances
EN 437:2018, Test gases - Test pressures - Appliance categories
EN 549:2019, Rubber materials for seals and diaphragms for gas appliances and gas equipment
EN 1106:2010, Manually operated taps for gas burning appliances
EN 10226-1:2004, 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 10266-2:2005, Pipe threads where pressure tight joints are made on the threads — Part 2: Taper
external threads and taper internal threads — Dimensions, tolerances and designation
EN ISO 228-1:2003, Pipe threads where pressure-tight joints are not made on the threads - Part 1:
Dimensions, tolerances and designation (ISO 228-1:2000)
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3 Terms and Definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
multi purpose boiling burner:
one or several burners which are part of a structure ensuring both the support of burners and that of
vessels and generally used as floor standing appliance
Note 1 to entry: They incorporate one device (or devices) which ensures one set position of the burner (or
burners) in relation to the plane on which the appliance rests and to vessels. Figure 1 gives diagrams of this type
of appliance, for information.
3.2
appliances incorporating a gas container
appliance whose body or support includes a fixing or support device for a liquefied petroleum container
3.3
burner
component that allows the gas to burn
Note 1 to entry: It may be:
— non-aerated burner, in which the air for combustion is entrained entirely at the burner outlet;
— aerated burner, in which part of the air for combustion, termed primary air, is entrained by the gas
flow and mixed before the burner outlet. The remainder of the air, termed secondary air, is drawn
in after the burner outlet.
3.4
ignition burner (pilot)
small burner whose flame is designed to light another burner
3.5
open burner
burner where the pans being heated are in direct contact with the flames
3.6
Injector
component part that admits the gas into an aerated burner
Note 1 to entry: There are two types of injectors:
— calibrated injectors where the section of the outlet orifice is fixed;
— adjustable injectors where the section of the outlet orifice is variable
3.7
ignition device
device to ignite one or more burners directly or indirectly, for instance through a flash tube
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Note 1 to entry: It may be:
— either electric (resistance, spark, etc.)
— or thermal (flame, pilot, etc.).
3.8
flame supervision device
device which, due to the presence of a flame on the sensing element, keeps open the gas flow to the
burner and pilot and which cuts off the gas supply to the burner and pilot in the case of extinction of the
supervised flame
3.9
detachable
which can be dismantled without using a tool
3.10
removable
which can only be removed with a tool
3.11
fittings
safety devices, controlling devices or regulating devices and sub-assemblies, incorporated into the
appliance
NOTE For example: tap, flame supervision device, ignition device…
3.12
locking of an adjuster
immobilization of an adjuster in its adjustment position by some means (screw, etc.)
3.13
control handle
component designed to be operated manually so as to control the movement of a control of the
appliance, such as a tap, etc
3.14
gripping area
area of the appliance designed to be manipulated during normal use
3.15
means of sealing
static or dynamic device designed to ensure soundness, for example: flat-faced joints, O-ring joints,
conical joints, diaphragms, grease, pastes, putties.
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3.16
primary air adjuster
device allowing the aeration rate of a burner to be set at a predetermined value according to the supply
conditions
Note 1 to entry: The action consisting in operating this device is termed “primary air adjustment”.
3.17
tap
device designed to isolate a burner from the gas supply pipework and to adjust its rate during use
Note 1 to entry: There are two types of taps:
— Taps with marked positions: taps for which specific positions are presset (lighting, reduced rate,
closed position)
— Taps with variable positions: taps with a continuous setting without specific position
3.18
ignition delay time
time between the ignition of the flame supervised, the appliance being at room temperature, and the
moment when the effect of this flame is sufficient to keep the closing member open
3.19
extinction delay time
time which elapses between the extinction of the supervised flame and the closure of the gas supply
controlled by the flame supervision device
3.20
soft solder
solder for which the lowest temperature of the melting range, after application, is less than 450 °C
3.21
pan support
support placed above an open burner, and designed to support the pan being heated
3.22
reference conditions
these correspond to 15 °C, 1 013, 25 mbar, unless otherwise specified
[EN 437:2018]
3.23
gas rate adjuster
device allowing the gas rate to a burner to be set at a predetermined value according to the supply
conditions
Note 1 to entry: The adjustment can be continuous (adjustment screw) or discontinuous (changing the calibrated
orifices).
Note 2 to entry: The operation of changing the setting of this device is termed the “adjustment of the gas rate”.
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3.24
gas supply pressure
difference between the static pressure measured at the gas inlet connection of the appliance and the
atmospheric pressure
Note 1 to entry: It is expressed in millibars (mbar).
3.25
pressure couple
set of two separate supply gas pressures applied because of the large difference between the Wobbe
indexes within a gas family or a gas group:
— the highest pressure applies only with gases of low Wobbe index;
— the lowest pressure applies only with gases of high Wobbe index.
[EN 437:2018]
3.26
calorific value
quantity of heat produced by the complete combustion, at a constant pressure equal to 1 013,25 mbar,
of a unit volume or mass of gas, the constituents of the combustible mixture being taken at reference
conditions and the products of combustion being brought back to the same conditions
Note 1 to entry: A distinction is made between:
— the gross calorific value Hs: the water produced by combustion is assumed to be condensed;
— the net calorific value Hi: the water produced by combustion is assumed to be in the vapour state.
Note 2 to entry: The calorific value is expressed:
3
— either in megajoules per cubic metre (MJ/m ) of dry gas under the reference conditions;
— or in megajoules per kilogram (MJ/kg) of dry gas.
Note 3 to entry: For the purposes of this European Standard only the gross calorific value is used.
Note 4 to entry: Adapted from EN 437:2018.
3.27
heat input
quantity of energy used in unit time corresponding to the volumetric or mass flow rates, the calorific
value used being either the net or gross calorific value
Note 1 to entry: The heat input is expressed in kilowatts (kW).
[EN 437:2018]
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3.28
nominal heat input
Q
n
value of the heat input of the appliance declared in the instructions
Note 1 to entry: Adapted from EN 437:2018
3.29
mass flow rate
M
mass of gas consumed by the appliance in unit time during continuous operation
Note 1 to entry: The mass flow rate is expressed in kilograms per hour (kg/h) or grams per hour (g/h).
[EN 437:2018]
3.30
volume flow rate
V
volume of gas consumed by the appliance in unit time during continuous operation
3
Note 1 to entry: The volume flow rate is expressed in cubic metres per hour (m /h), litres per minute (l/min),
3 3
cubic decimetres per hour (dm /h) or cubic decimetres per second (dm /s).
[EN 437:2018]
3.31
relative density
d
ratio of the masses of equal volumes of dry gas and dry air under the same conditions of temperature
and pressure: 15 °C or 0 °C and 1 013, 25 mbar
[EN 437:2018]
3.32
wobbe index
gross Wobbe index Ws;
net Wobbe index Wi
ratio of the calorific value of a gas per unit volume and the square root of its relative density under the
same reference conditions
Note 1 to entry: The Wobbe index is said to be gross or net according to whether the calorific value used is the
gross or net calorific value.
Note 2 to entry: The Wobbe index is expressed:
3
— either in megajoules per cubic metre (MJ/m ) of dry gas under the reference conditions;
— or in megajoules per kilogram (MJ/kg) of dry gas.
Note 3 to entry: Adapted from EN 437:2018.
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3.33
stability of flames
condition of flames when the phenomena of flame lift or light back do not occur
3.34
flame lift
phenomenon characterized by the partial or total movement of the base of the flame away from the
burner port
3.35
sooting
phenomenon appearing during incomplete combustion and characterized by a deposit of carbon on
surfaces in con tact with the flame or the products of combustion
3.36
light back
phenomenon characterized by the return of the flame inside the body of the burner
4 Classification
4.1 Classification of gases used
Gases used are classified in families and groups according to their Wobbe number.
According to EN 437:2018, the third family, grouping liquefied petroleum gases, covers Wobbe indexes
3 3
between 72,9 MJ/m and 87,3 MJ/m (Ws). It is subdivided into two groups, group P which covers the
3 3
range of Wobbe indexes between 72,9 MJ/m and 76,8 MJ
...