BS-EN-676 pdf free download
BS-EN-676 pdf free download. Automatic forced draught burners for gaseous fuels.
4 Constructional and operational requirement 4.1 Conversion to different gases The precautions to be taken when converting from a gas of one group or family to a gas of another group or family and/or to adapt for different gas supply pressures shall be given by the manufacturer in the instructions for operation. 4.2 Construction 4.2.1 Design The design and construction of the burner shall for its intended application be such that with the intended input or input range and within the prescribed range of pressure, the fuel gas that is to be used is burned completely and safely. Moving parts shall be shielded if the enclosure provided does not ensure adequate protection. The construction of the burner shall be in such a way that no instability, distortion or breakage likely to impair its safety can occur. Levers and similar devices which have to be operated by the installer or user shall be appropriately identified. NOTE The burner head can be lengthened as long as the performance of the burner is not effected in an unsafe manner. The geometry and the distance l of the mixing device in the flame tube should remain unchanged. 4.2.2 Accessibility for maintenance and use Constructional parts accessible during use and maintenance shall be free from sharp edges and corners that might cause damage or personal injury during use or maintenance. Burners that can be withdrawn or swivelled out of position without the use of tools shall be interlocked (for example, by means of limit switches) in such a way that they cannot be operated in the withdrawn or swivelled position. The interlock device shall be fail safe in design and, if it is a limit switch, shall comply with EN 60204-1 and EN 60947-5-1 . 4.2.3 Soundness Holes for screws, studs, etc. intended for the assembly of parts shall not open into gasways. The wall thickness between drillings and gasways shall be at least 1 mm. This requirement shall not apply to orifices for measurement purposes or to components within the burner head. The soundness of parts and assemblies making up the gas circuit and likely to be dismantled during regular maintenance in situ shall be achieved by means of mechanical joints, for example metal-to-metal joints, gaskets, or 0-ring joints, but excluding the use of all sealing materials such as tape, paste or liquids. All sealing materials shall remain effective under normal conditions of burner use. 4.2.4 Materials The quality and thickness of the materials used in the construction of the burner shall be selected in such a way that the constructional and performance characteristics of the system do not deteriorate during operation. In particular, all the components of a burner shall withstand the mechanical, chemical and thermal loads that may be encountered during operation. Under normal conditions of use, maintenance and adjustment, they shall not show any changes that could affect their normal functioning. If the housing contains any metal parts not made of corrosion-resistant material, these shall be suitably protected with an effective anti-corrosion coating. Asbestos or asbestos-containing materials shall not be used.BS-EN-676 pdf download.
