FprEN 497

Specification for dedicated liquefied petroleum gas appliances - Multi purpose boiling burners for outdoor use - Cooking vessels with a diameter greater than 300 mm

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

Zweck dieses Dokuments ist es, Bau, Betriebsanforderungen, Sicherheitsanforderungen, Anforderungen an die wirtschaftliche Energieverwendung sowie die entsprechenden Prüfmethoden und Kennzeichnung der Brenner, die Flüssiggas verbrennen und zum Erwärmen von Behältern mit einem Durchmesser von mehr als 300 mm bestimmt sind, festzulegen.
Sie werden im gesamten Text als „Geräte“ bezeichnet.
Dieses Dokument gilt für die in der Regel auf einem Boden stehende Geräte, die mit einem oder mehreren offenen Brennern ohne Gehäuse ausgestattet sind, die für die Verwendung im Freien ausgelegt sind und mit Gasen betrieben werden, die den unter 4 festgelegten Kategorien entsprechen.
Dieses Dokument gilt nicht für Geräte, die mit Gasen der 3. Gasfamilie bei einem Druck größer als in 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 gilt nicht für LPG-Flüssiggasbehälter, die dazugehörigen Regelgeräte, Schlauchleitungen und biegsamen Anschlussschläuche für die Gasversorgung von Geräten, die von diesem Dokument abgedeckt werden. Regelgeräte, Schlauchleitungen und biegsame Anschlussschläuche unterliegen anderen Normen (EN 16129, EN 16436 1 und prEN 16436 2 usw.) und nationalen Vorschriften.

Spécifications pour les appareils fonctionnant exclusivement aux gaz de pétrole liquéfiés - Brûleurs à usages multiples, avec supports intégrés, utilisés en plein air - Récipients de cuisson avec un diamètre supérieur à 300 mm

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

General Information

• Status: Not Published
• ICS: 97.040.20 - Cooking ranges, working tables, ovens and similar appliances
• Technical Committee: CEN/TC 181 - Dedicated liquified petroleum gas appliances
• Drafting Committee: CEN/TC 181/WG 1 - Flueless space heaters
• Current Stage: 5060 - Closure of Vote - Formal Approval
• Due Date: 25-Nov-2021
• Completion Date: 25-Nov-2021
• Directive: 2016/426 - REGULATION (EU) 2016/426 OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 9 March 2016 on appliances burning gaseous fuels and repealing Directive 2009/142/EC
• Mandate: M/BC/CEN/89/6 - Standardization request to CEN concerning appliances burning gaseous fuels
• Ref Project: kSIST FprEN 497:2021 - Specification for dedicated liquefied petroleum gas appliances - Multi purpose boiling burners for outdoor use

RELATIONS

• Revised: EN 497:1997 - Specification for dedicated liquefied petroleum gas appliances - Multi purpose boiling burners for outdoor use
• Effective Date: 24-Jul-2019

Standards Content (sample)

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:

— 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
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
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
volume of gas consumed by the appliance in unit time during continuous operation

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

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:

— 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
...