oSIST prEN 521:2022
(Main)Specifications for dedicated liquefied petroleum gas appliances - Portable vapour pressure liquefied petroleum gas appliances
Specifications for dedicated liquefied petroleum gas appliances - Portable vapour pressure liquefied petroleum gas appliances
This document specifies the construction and performance characteristics related to safety and the rational use of energy of portable appliances burning liquefied petroleum gases at the vapour pressure within the gas cartridge or gas cylinder, excepting those where the gas cartridge is inserted horizontally in the chassis.
NOTE These appliances are referred to in the body of the text as "appliances".
This document applies to various types of portable appliances burning liquefied petroleum gases at vapour pressure and designed to be used with cartridges as complying with EN 417 or gas cylinders.
This document covers appliances for outdoor or in well ventilated areas uses only.
For example the following types of appliances are covered:
a) cooking appliances (stoves, grills, barbecues...);
This document does not cover barbecues that can be used indoors;
b) lighting appliances;
c) heating appliances;
This document only applies to appliances with a maximum heat input of up to 3 kW (Hs) for outdoor use only;
d) blowtorches;
This document only applies to blowtorches without a flexible hose;
e) laboratory burners.
The requirements apply to these appliances or their functional sections whether or not the latter are independent or incorporated into an assembly.
Appliances covered by this document are not connected to a flue for the discharge of products of combustion and are not connected to the mains electricity supply.
This document covers neither appliances supplied with LPG in the liquid phase nor appliance with fixed integral container which may or may not be refilled by the user
It does not apply to lighters as defined in EN ISO 9994.
It does not apply to gas appliances operating with a valve cartridge which is horizontally integrated into the chassis of the appliance also called "flat portable gas stove".
Requirements for rational use of energy have been included for stove burners.
However, such requirements have not been included for the other types of appliances because:
- for grills and barbecues, this is a type of cooking which is achieved by various means such as radiant elements; in addition this type of cooking varies according to the type of food and region where the appliance is used;
- for lighting appliances, the consumption is insignificant because these appliances have a very low rate and are used only for a few hours in a year;
- for heating appliances, all the heat produced is discharged into the environment;
- for tools such as blowtorches which are not professional tools in regular use, the gas consumption depends very much on the way it is used.
Festlegungen für Flüssiggasgeräte - Tragbare, mit Dampfdruck betriebene Flüssiggasgeräte
Dieses Dokument legt die Konstruktions- und Leistungsmerkmale hinsichtlich Sicherheit und wirtschaftlicher Energienutzung tragbarer Geräte fest, die Flüssiggase bei Dampfdruck innerhalb der Gaskartusche oder der Gasflasche verbrennen, ausgenommen die Fälle, in denen die Gaskartusche horizontal in das Gehäuse eingebaut wird.
ANMERKUNG Diese Geräte werden im gesamten Text als „Geräte“ bezeichnet.
Dieses Dokument bezieht sich auf verschiedene Arten tragbarer Geräte, die Flüssiggase bei Dampfdruck verbrennen, die mit Kartuschen (die der EN 417 entsprechen) oder Gasflaschen betrieben werden.
Dieses Dokument behandelt nur Geräte, die für die Verwendung im Freien oder in gut belüfteten Bereichen bestimmt sind.
Beispielsweise gehören dazu folgende Geräte:
a) Kochgeräte (Kocher, Grills, Bratgeräte ...);
Dieses Dokument betrifft nicht Bratgeräte für Innenräume;
b) Leuchtgeräte;
c) Heizgeräte;
Dieses Dokument gilt nur für Heizgeräte mit einer maximalen Wärmebelastung bis zu 3 kW (Hs) und ausschließlich zur Benutzung im Freien;
d) Lötlampen;
Dieses Dokument gilt nur für Lötlampen ohne Schlauchleitung;
e) Laborbrenner.
Die Anforderungen gelten für diese Geräte und deren funktionale Bauteile, unabhängig davon, ob letztere unabhängig oder in eine Baugruppe eingebaut sind.
Durch dieses Dokument sind nur Geräte abgedeckt, die nicht an Abgasleitungen zur Abführung der Verbrennungsprodukte und nicht an das elektrische Netz angeschlossen sind.
Dieses Dokument bezieht sich weder auf Geräte, die mit Flüssiggas in flüssiger Phase versorgt werden, noch auf Geräte mit fest eingebautem, durch den Anwender nachfüllbaren oder nicht nachfüllbaren Gasbehälter.
Es ist nicht auf die in der Norm EN ISO 9994 festgelegten Feuerzeuge anwendbar.
Es gilt nicht für Gasgeräte, die mit einer horizontal in das Gehäuse des Geräts eingebauten Ventilkartusche, auch bezeichnet als „flacher tragbarer Gaskocher“, betrieben werden.
Die Anforderungen an die wirtschaftliche Nutzung der Energie wurden in Hinblick auf die Brenner der Kocher berücksichtigt.
Dagegen wurden derartige Forderungen nicht für die anderen Gerätearten festgelegt, denn:
— für Grills und Bratgeräte wird das Kochergebnis durch verschiedene Mittel, wie strahlende Teile, realisiert; das Kochergebnis ist je nach Art der Nahrung und der Region, in der das Gerät eingesetzt wird, unterschiedlich;
— für Leuchtgeräte, die nur sehr geringen Durchsatz haben und nur wenige Stunden des Jahres benutzt werden, ist der Verbrauch vernachlässigbar;
— für Heizgeräte wird die gesamte Wärme auf die Umgebung übertragen;
— für Werkzeuge, wie Lötlampen, die nicht berufsmäßig ständig benutzt werden, hängt der Gasverbrauch sehr von der Arbeitsweise des Betreibers ab.
Spécifications pour les appareils fonctionnant exclusivement aux gaz de pétrole liquéfiés - Appareils portatifs alimentés à la pression de vapeur des gaz de pétrole liquéfiés
Le présent document définit les caractéristiques de construction et de fonctionnement liées à la sécurité et à l’utilisation rationnelle de l’énergie des appareils portatifs utilisant des gaz de pétrole liquéfiés à la pression de vapeur des cartouches ou récipients de gaz, à l’exception de ceux dont la cartouche est insérée horizontalement dans le châssis.
NOTE Ces appareils portatifs sont désignés dans l’ensemble du texte par « appareils ».
Le présent document s’applique aux différents types d’appareils portatifs utilisant des gaz de pétrole liquéfiés à la pression de vapeur et conçus pour être utilisés avec des cartouches (conformes à l’EN 417) ou avec des récipients de gaz.
Le présent document couvre les appareils pour utilisation en plein air ou dans des espaces bien aérés uniquement.
Sont par exemple visés les types d’appareils suivants :
a) appareils de cuisson (réchauds, grilloirs, barbecues…) ;
Le présent document ne s’applique pas aux barbecues utilisables dans des locaux.
b) appareils d’éclairage ;
c) appareils de chauffage ;
Le présent document ne s’applique qu’aux appareils de chauffage ayant une puissance calorifique maximale de 3 kW (Hs) et utilisables exclusivement en plein air.
d) appareils de brasage ;
Seuls les appareils de brasage sans tuyau souple sont couverts par le présent document.
e) brûleurs de laboratoire.
Les exigences s’appliquent à tous ces appareils ou éléments, que ces derniers soient indépendants ou incorporés dans un ensemble.
Les appareils couverts par le présent document ne sont pas raccordés à un conduit d’évacuation des produits de la combustion et n’ont pas de raccordement au réseau électrique.
Le présent document ne s’applique ni aux appareils alimentés aux GPL en phase liquide ni à ceux avec réservoir fixe incorporé remplissable ou non par l’utilisateur.
Il ne s’applique pas non plus aux briquets définis dans l’EN ISO 9994.
Il ne s’applique pas aux appareils fonctionnant avec une cartouche qui est incorporée horizontalement dans le châssis de l’appareil, aussi appelés « réchauds à gaz portatifs plats ».
Des exigences concernant l’utilisation rationnelle de l’énergie ont été définies pour les brûleurs de réchaud.
En revanche, de telles exigences n’ont pas été fixées pour les autres types d’appareils, car :
— pour les grilloirs et les barbecues, la qualité de cuisson est obtenue par différents moyens tels que des éléments rayonnants, laquelle qualité de cuisson varie par ailleurs en fonction du type d’aliment et des régions où l’appareil est utilisé ;
— pour les appareils d’éclairage, la consommation est insignifiante, car ces appareils ont un débit très faible et ne sont utilisés que quelques heures dans l’année ;
— pour les appareils de chauffage, toute la chaleur produite est transmise dans l’environnement ;
— pour les outils tels que les lampes à souder, qui ne sont pas des outils professionnels utilisés en permanence, la consommation de gaz dépend beaucoup des habitudes de travail de l’utilisateur.
Specifikacije za plinske aparate na utekočinjeni naftni plin - Prenosni aparati, ki delujejo s tlakom uparjenega plina
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
oSIST prEN 521:2022
01-april-2022
Specifikacije za plinske aparate na utekočinjeni naftni plin - Prenosni aparati, ki
delujejo s tlakom uparjenega plina
Specifications for dedicated liquefied petroleum gas appliances - Portable vapour
pressure liquefied petroleum gas appliances
Festlegungen für Flüssiggasgeräte - Tragbare, mit Dampfdruck betriebene
Flüssiggasgeräte
Spécifications pour les appareils fonctionnant exclusivement aux gaz de pétrole liquéfiés
- Appareils portatifs alimentés à la pression de vapeur des gaz de pétrole liquéfiés
Ta slovenski standard je istoveten z: prEN 521
ICS:
27.060.20 Plinski gorilniki Gas fuel burners
oSIST prEN 521:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 521:2022
DRAFT
EUROPEAN STANDARD
prEN 521
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2022
ICS Will supersede EN 521:2019+AC:2019
English Version
Specifications for dedicated liquefied petroleum gas
appliances - Portable vapour pressure liquefied petroleum
gas appliances
Spécifications pour les appareils fonctionnant Festlegungen für Flüssiggasgeräte - Tragbare, mit
exclusivement aux gaz de pétrole liquéfiés - Appareils Dampfdruck betriebene Flüssiggasgeräte
portatifs alimentés à la pression de vapeur des gaz de
pétrole liquéfiés
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 521:2022 E
worldwide for CEN national Members.
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Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 5
3 Terms and definitions . 5
4 Classification. 9
5 Safety requirements . 10
6 Test methods . 23
7 Markings . 41
8 Instructions for use, maintenance and assembly . 42
Annex A (normative) Characteristics of test vessels (see 6.5.2.3) . 57
Annex B (normative) Tests on needle valves (see 6.9) . 59
Annex C (informative) Examples of authorized solutions . 61
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Regulation (EU) 2016/426/EC . 68
Bibliography . 71
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European foreword
This document (prEN 521:2022) has been prepared by Technical Committee CEN/TC 181 “Appliances
and leisure vehicle installations using liquefied petroleum gas and appliances using natural gas for
outdoor use”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 521:2019+AC:2019.
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 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.
For relationship with EU Regulation (EU) 2016/426, see informative Annex ZA, which is an integral part
of this document.
The changes from the 2019 version is the addition of a ZA Annex in relation with EU Regulation (EU)
2016/426 and adaptation of corresponding clauses.
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1 Scope
This document specifies the construction and performance characteristics related to safety and the
rational use of energy of portable appliances burning liquefied petroleum gases at the vapour pressure
within the gas cartridge or gas cylinder, excepting those where the gas cartridge is inserted horizontally
in the chassis.
NOTE These appliances are referred to in the body of the text as “appliances”.
This document applies to various types of portable appliances burning liquefied petroleum gases at
vapour pressure and designed to be used with cartridges (which comply with EN 417) or gas cylinders.
This document covers appliances for outdoor or in well ventilated areas uses only.
For example the following types of appliances are covered:
a) cooking appliances (stoves, grills, barbecues.);
This document does not cover barbecues that can be used indoors;
b) lighting appliances;
c) heating appliances;
This document only applies to appliances with a maximum heat input of up to 3 kW (H ) for outdoor use
s
only;
d) blowtorches;
This document only applies to blowtorches without a flexible hose;
e) laboratory burners.
The requirements apply to these appliances or their functional sections whether or not the latter are
independent or incorporated into an assembly.
Appliances covered by this document are not connected to a flue for the discharge of products of
combustion and are not connected to the mains electricity supply.
This document covers neither appliances supplied with LPG in the liquid phase nor appliance with fixed
integral container which may or may not be refilled by the user
It does not apply to lighters as defined in EN ISO 9994.
It does not apply to gas appliances operating with a valve cartridge which is horizontally integrated into
the chassis of the appliance also called “flat portable gas stove”.
Requirements for rational use of energy have been included for stove burners.
However, such requirements have not been included for the other types of appliances because:
— for grills and barbecues, this is a type of cooking which is achieved by various means such as radiant
elements; in addition this type of cooking varies according to the type of food and region where the
appliance is used;
— for lighting appliances, the consumption is insignificant because these appliances have a very low
rate and are used only for a few hours in a year;
— for heating appliances, all the heat produced is discharged into the environment;
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— for tools such as blowtorches which are not professional tools in regular use, the gas consumption
depends very much on the way it is used.
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.
1 )
EN 30-1-1:—, , Domestic cooking appliances burning gas fuel — Part 1-1: Safety — General
EN 125:2010+A1:2015, Flame supervision devices for gas burning appliances — Thermoelectric
flame supervision devices
EN 437:2018, Test gases — Test pressures — Appliance categories
EN 549:2019, Rubber materials for seals and diaphragms for gas appliances and gas
equipment
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 https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
3.1
stove
cooking appliance incorporating one or several burners and a pan support(s) designed in such a way that
it(they) can support the vessels containing the food
3.2
flat portable gas stove
flat stove operating with a gas cartridge horizontally placed in the chassis for which the length or width
is bigger than its height
Note 1 to entry: Figure 2 gives an example of a flat portable gas stove
3.3
vapour pressure appliance
appliance for which the pressure at the gas inlet is equal to the pressure in the gas cartridge or gas
cylinder
Note 1 to entry: If the appliance is fixed directly to the gas cylinder by a rigid connection, the appliance inlet is the
part of the connection that takes the gas from the cylinder. A pressure reducing device may be incorporated in the
gas circuit, between the gas inlet and the injector.
1)
Under preparation. Stage at the time of publication: prEN 30-1-1:2017
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Note 2 to entry: If the appliance is connected to the gas cylinder by a flexible hose, the pressure in the flexible hose
once it is connected to the gas cylinder is equal to the pressure in the gas cylinder. A pressure reducing device may
be incorporated in the gas circuit downstream of the flexible hose
3.4
gas cylinder
refillable or non-refillable container fitted with a valve filled with gas or a gas mixture
3.5
gas cartridge
non-refillable container with a maximum capacity of 1 000 ml filled with gas or a gas mixture
Note 1 to entry: It may be fitted with a valve. If it is not fitted with a valve, the release of gas is carried out following
perforation of the cartridge by means of a device incorporated in the appliance
3.6
cooking device
device supplied with the appliance designed to hold or receive the food to be cooked
Note 1 to entry: Grid, turnspit, baking tray etc.
3.7
useful part of a cooking device
part of the device in contact with food during cooking
3.8
grid
cooking device designed to hold the food to be cooked
Note 1 to entry: Its useful component(s) can be rigid or flexible
3.9
grid with flexible useful components
cooking device made up of two jointed components enabling tight gripping of the food to be cooked
Note 1 to entry: Each component consists of a rigid frame on which metallic wires are fixed and form a flexible
mesh inside the frame distorting around the food
3.10
barbecue
appliance designed principally to roast and/or grill food
Note 1 to entry: Cooking is carried out by radiant heat and, possibly, by convection and conduction
3.11
griddle
part of a stove consisting of a plate placed above a burner, that allows the cooking of food by direct contact
with the surface of the plate which is brought to a high temperature
3.12
stabilizer
part of the appliance designed to increase mechanical stability
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3.13
pan support
support placed above an open stove burner and designed to support the pan to be heated
3.14
turnspit
cooking device enabling the rotation of the food to be roasted
Note 1 to entry: The rotation can be manual or using a mechanical or electrical motor (battery)
3.15
glass panel
glass surface or part of a glass surface allowing the inside of an enclosure to be seen
3.16
fittings
safety devices, controlling devices or regulating devices and sub-assemblies thereof, designed to be
incorporated into an appliance or to be assembled to constitute an appliance
Note 1 to entry: for example valves, flame supervision devices
Note 2 to entry: cartridge is not considered as fittings
3.17
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 any pilot and which cuts off the gas supply to the burner and possibly a pilot in the event of extinction
of the supervised flame
3.18
ignition delay time
time between the ignition of the supervised flame and the moment when the effect of this flame is
sufficient to keep the closing device open
3.19
extinction delay time
time between the extinction of the supervised flame and the closure of the gas supply to the burner and
possibly a pilot
3.20
tap
controlling device, part of the appliance, designed to isolate a burner from the internal gas pipework and
possibly to adjust its rate during use
3.21
control handle
component designed to be operated manually so as to operate a control of the appliance
Note 1 to entry: e.g. a tap, thermostat etc.
3.22
gripping area
outside part of the appliance designed to be handled during use
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3.23
burner
component that allows the gas to burn
Note 1 to entry: two types of burners are distinguished
— ignition burner: small burner whose flame is designed to light a main burner. It is referred to as “pilot” in this
document;
— main burner: burner designed to fulfil a thermal function of the appliance. It is referred to as “burner” in this
document
3.24
injector
component part that admits the gas into a burner
Note 1 to entry: An injector is said to be calibrated when the section of the outlet orifice is fixed
3.25
ignition device
device to ignite one or more burners directly or indirectly
3.26
primary air adjuster
device allowing the modification of the primary air rate
Note 1 to entry: The action consisting in operating this device is termed “primary air adjustment”
3.27
means of sealing
static or dynamic device designed to ensure leak tightness
Note 1 to entry: for example: flat-faced joints, O-ring or conical joints, diaphragms, grease, pastes, putties etc.
3.28
detachable
possible to dismantle without using a tool
3.29
removable
removal only possible with a tool
3.30
soft solder
solder for which the lowest temperature of the melting range, after application, is less than 450 °C
3.31
flame stability
flames are stable at the burner ports when the phenomena of flame lift or light back do not occur
3.32
flame lift
phenomenon characterized by the partial or total movement of the base of the flame away from the
burner port
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3.33
light back
phenomenon characterized by the return of the flame inside the body of the burner
3.34
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/m3) of dry gas under the reference conditions;
— or in megajoules per kilogram (MJ/kg) of dry gas.
[SOURCE: EN 437:2018]
3.35
gas supply pressure
difference between the static pressure measured at the gas inlet connection of the appliance and the
atmospheric pressure. It is expressed in bar
4 Classification
4.1 Classification of gases
Gases likely to be used are classified in three groups according to their pressures:
a) butane:
Mixture of hydrocarbons containing mainly butanes and butenes having a maximum pressure of
8 bar gauge at 50 °C;
b) butane-propane mixture:
Mixture of hydrocarbons containing mainly butanes, butenes, propane and propene having a
pressure between 8 bar gauge and 12 bar gauge at 50 °C;
c) propane:
Mixture of hydrocarbons containing mainly propane and propene having a pressure above 12 bar
gauge at 50 °C.
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4.2 Categories of appliances
Appliances are classified in three categories according to the gases likely to be used:
— category direct pressure – butane;
— category direct pressure - butane-propane mixture;
— category direct pressure - propane.
5 Safety requirements
5.1 General
The test methods and the means of verification are indicated in Clause 6.
The design shall make it impossible to incorrectly fit or refit any user-removable or replaceable part(s)
or component(s) that can have an adverse effect on combustion or cause CO emissions to exceed limits
in Clause 5.26.
5.2 Adjustment of the burner
For appliances of types a), b) and c) of the scope of this document, not any adjustment of the burner shall
be possible.
5.3 Materials
Non-metallic materials used as radiant elements in appliances (for example volcanic rocks, refractory
blocks) shall resist to all tests of this documents without alteration.
The quality and thickness of materials used in the construction of appliances shall be such that the
constructional and performance characteristics are not altered in use. In particular all the parts of the
appliance shall withstand mechanical, chemical and thermal actions to which they may be submitted
during use. In normal conditions of operation, of cleaning or of adjustment, they shall not be liable to any
alterations which might impair their safety.
Sheet-metal parts, not made of corrosion-resistant material, shall be effectively protected against
corrosion. This requirement does not apply to grilles supporting lava rocks nor to cooking devices.
Seals and joining compounds shall have characteristics suited to their use.
Rubber based materials shall comply with EN 549:2019 class A2 minimum, and LPG resistant.
Hoses being part of the appliance shall be LPG resistant.
Copper tubing shall be used upstream of the injector only if its temperature does not exceed 100 °C when
the test described in 6.21 is carried out.
Asbestos or asbestos-based materials shall not be used.
With the exception of seals, membranes, parts in contact with gas shall be made of metallic materials.
Material intended to be in contact with food shall be:
— corrosion resistant;
— non toxic.
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The materials shall:
— not transfer undesirable odours, colours or taint to the food;
— not contribute either to the contamination of food or have any adverse influence on the food.
NOTE For information see EN 1672-2.
5.4 Assembly, cleaning and maintenance
5.4.1 Assembly
The entire appliance gas circuit, including the injector and flexible hoses if any, shall be factory assembled.
If clamps are used, they shall be of the machine formed type. Removable clamps are not permitted.
Parts, whose assembly is carried out by the user, shall be able to be assembled correctly by following the
instructions given in the instructions.
It shall not be possible to dismantle parts which are adjusted at the factory, which are not intended to be
dismantled by the user and whose dismantling would affect safety, without using tools. If dismantling is
possible using an open ended spanner or a screwdriver, direct access to such nuts and screw heads shall
not be possible, unless they are sealed.
If a pressure reducing device is integrated in the gas circuit, it shall not be removable nor replaceable by
the user.
NOTE This device can provide the functions of adjustment, opening and closing of the gas flow.
Connections shall allow the flexible hose to move freely without risk of coming into contact with a part of
the appliance whose temperature rise exceeds 70 K during the test defined in 6.21 when fitted in
accordance with the instructions.
5.4.2 Cleaning, maintenance
All parts of the appliance requiring frequent cleaning by the user shall be easily accessible. It shall be
possible to put these parts back correctly.
There shall be no sharp corners and edges on the accessible parts of an appliance which could give rise
to injury, for example during cleaning.
5.5 Strength and stability
5.5.1 Strength
5.5.1.1 General
The construction of an appliance shall be such that, during normal conditions of use:
— any displacement of parts;
— any distortion;
— any deterioration
likely to impair safe operation will not occur.
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prEN 521:2022 (E)
5.5.1.2 Stove pan supports
The application of a mass as described in 6.5.1.2 on the pan support shall not cause any breakage or
permanent distortion of the pan support exceeding 1 mm.
5.5.1.3 Glass components
The accessible edges of glass components shall not be sharp. They shall withstand the various stresses to
which they are subjected during the tests described in this document without damage. In particular they
shall withstand the tests described in 6.5.1.3.1 (when they are a part of the appliance) and in 6.5.1.3.2.
5.5.2 Stability
If the appliance is fitted with a foldable support, it shall be possible to lock this in the position of use (for
example: stop, locking device).
If the radiant device of a barbecue or a grill can have several positions, a stop shall be provided for each
of them.
The stability of an appliance designed to rest on a table or on the ground shall allow safe use on level
ground. In addition, the appliance shall not tilt or fall over when it is placed on a slope of 10° and any lid
shall not close.
This requirement shall also be met when the appliance is fitted with optional parts (for example: lamp
extension posts).
These requirements shall be met under the test conditions described in 6.5.2.
5.6 Soundness of the gas circuit assembly
Holes for screws, pins, etc, intended for the assembly of components shall not open into the space
reserved for the gas ways leading to the injector.
The soundness of parts and assemblies connected to the gas circuit shall be ensured by means of metal-
to-metal joints or joints with seals (for example, flat-faced joints, O-rings or gaskets), i.e. excluding the
use of any product which ensures soundness in the threads. For parts that do not require to be dismantled
during normal maintenance, for example taps, the use of thread sealing compounds is permitted.
Removable components or the threaded parts of the gas pipework which may be dismantled during
maintenance described in the instructions shall remain sound after five disconnections and re-
connections in accordance with the instructions, if necessary after changing a gasket.
Soft solder (see definition in 3.30) shall not be used to ensure the soundness of the gas circuit. However
it is permitted for internal connections within the gas circuit when they do not involve soundness.
Under the test conditions defined in 6.6.1, during each of the tests no. One and 2, the leak shall not exceed
0,07 l/h (1 013 mbar, 15 °C). This requirement shall also be met after all the tests on the appliance have
been carried out, but before any dismantling of parts subjected to the soundness tests.
After the application of a load to the flexible hose under the conditions defined in 6.6.2, no leak greater
than 0,07 l/h (1 013 mbar, 15 °C) shall be recorded.
5.7 Connections
5.7.1 General
Whatever the type of gas cartridge or gas cylinder, when following the instructions, connection of the
appliance to the gas cartridge or gas cylinder shall be easy without gas leakage during more than 2 s.
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oSIST prEN 521:2022
prEN 521:2022 (E)
5.7.2 Appliances intended to be directly fitted to the gas cartridge or gas cylinder
5.7.2.1 Appliances fitted to pierceable cartridges
a) design/construction of the appliance shall be such that there is no foreseeable replacement
procedure sequence possible which can lead to an unsafe and/or unintended piercing of the cartridge
by the user.
NOTE See in informative Annex C examples of solutions given in Figures C.1 to C.7
b) The cartridge holder and the piercing device shall be such that:
1) the piercing is centred in the position provided;
2) soundness is ensured before piercing;
3) after placing the cartridge, it shall not be possible to remove it, instantaneously and
unintentionally, without first having to remove the piercing device.
Diagrams showing the correct sequence for the fitting of the cartridge to the appliance shall be marked
on the appliance.
c) Concerning the compatibility between ILL (internal leakage limiter as defined in 3.15 of
EN 417:2012) and piercing device:
— Piercing device should open and not damage ILL inside the cartridges.
— Piercing device should be such as the needle length penetrates cartridge for a distance between
7 and 9 mm (see Figure 3).
5.7.2.2 Appliances fixed onto cartridges with female valve and threaded centre boss as defined
in EN 417 (see Figure 4)
5.7.2.2.1 The female thread of the adaptor (Figure 5) designed to be fixed onto the thread of the centre
boss valve is defined as follows:
— 7/16 in - 28 threads Unified Form Special - (see Figure 6);
— major diameter : 10,96 mm minimum;
— effective diameter : 10,66 mm to 10,75 mm;
— minor diameter : 10,20 mm to 10,27 mm.
5.7.2.2.2 The part of the adaptor, with a full thread, shall be 3,10 mm ± 0,1 mm long (see Figure 5 a)).
5.7.2.2.3 The thread shall penetrate fully into the seal groove without reduction in form.
5.7.2.2.4 A valve actuator shall be fixed on the axis of the adaptor in such a way that it allows the
drawing off of gas from a full cartridge in accordance with 5.7.1. The valve actuator shall allow the release
of gas from the cartridge when the appliance is screwed onto the valve with a minimum torque of 3 Nm.
5.7.2.2.5 The diameter of the valve actuator shall not exceed 2,20 mm if it is solid and shall be between
3,10 mm and 3,15 mm if it includes a gas way as indicated in Figure 4 b). The valve actuator shall be
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oSIST prEN 521:2022
prEN 521:2022 (E)
concentric with the “7/16 in - 28 unified form thread” subject to a tolerance of 0,15 mm (see Figures 5 a)
and 5 b)).
5.7.2.2.6 At the point where the valve actuator comes into contact with the valve seat, the valve
actuator diameter shall be at least 1,70 mm (see Figure 5 a)).
It is recommended that adaptor manufacturers contact manufacturers of cartridge valves to establish the
preferred design (see Figure 5 b)). The valve actuator shown in Figure 5 b) comes in contact with the
inner seal of the valve ensuring complete soundness when the cartridge is fitted.
5.7.2.2.7 A seal groove shall be machined at the bottom of the threaded part so as to centre and secure
a seal (see Figure 5 a)). This seal shall come into contact with the valve centre boss. The seal and the seal
groove shall be such that there is no visible and permanent distortion of the threaded centre boss when
the appliance is screwed onto the valve with a torque of 12 Nm.
5.7.2.2.8 The length of the valve actuator shall be such that it does not penetrate into the valve for a
distance exceeding 4,15 mm below
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