BS EN 521 pdf free download
BS EN 521-2019 pdf free download.Specifications for dedicated liquefied petroleum gas appliances – Portable vapour pressure liquefied petroleum gas appliances.
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 European Standard, 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 be of a quality suitable to their use.
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 lN 549:1994 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.
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 how.
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 oEan 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.
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 European Standard 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.BS EN 521 pdf download.
