BS EN 777-1:2009 pdf download – Multi-burner gas-fired overhead radiant tube heater systems for non- domestic use Part 1: System D — Safety ln particular，when the system is installed according to the manufacturers instructions，all thecomponents shall withstand the mechanical，chemical and thermal conditions to which they may besubjected when used in a manner which can be reasonably foreseen. Copper shall not be used for gas carrying parts where the temperature is likely to exceed 100 °c. Asbestos or materials containing asbestos shall not be used. Solder that has a melting point below 450 °C after application shall not be used for gas-carrying parts. 5.1.3Accessibility for maintenance and use Components and controls shall be arranged such that any adjustment, maintenance or exchange is easywithout removing the radiant tube from the installed position. Where necessary，access doors orremovable panels shall be provided. Parts that are intended to be removable for maintenance or cleaning shall be readily accessible, shall besimple to assemble correctly and difficult to assemble incorrectly.Such parts shall be difficult to assembleincorrectly where incorrect assembly would create a hazardous condition or result in damage to thesystem and its controls. Parts of the system which are not intended to be removed by the user and for which removal would affectsafety shall be capable of removal only with the aid of tools. 5.1.4 Means of sealing 5.1.4.1 Soundness of the gas circuit Holes for screws, studs, etc. intended for the assembly of components shall not open into the gasways.The wall thickness between holes (including threads) and gasways shall be not less than 1 mm. The soundness of components and assemblies connected to the gas circuit and likely to be dismantledfor routine maintenance at the consumer’s premises shall be assured by means of mechanical joints,(e.g. metal to metal joints,O-ring joints or packing) but excluding the use of any sealing compound suchas tape, mastic or paste.The soundness shall be maintained after dismantling and re-assembly. Sealing compounds may be used for permanent threaded assemblies. The sealing material shall remaineffective under normal conditions of system use. 5.1.4.2Soundness of the combustion circuit The soundness of the combustion circuit of the system shall be effected by mechanical means only, withthe exception of those parts which do not require to be disconnected for routine maintenance, and whichmay be joined with mastic or paste in such a way that permanent soundness is assured under normalconditions of use (see 8.2.2.1 c). 5.1.5 Supply of...
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