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AIRTIGHT GAS-FIRED RADIANT TUBES INFRA7 GAS PIPESYSTEMA S.p.A.The gas supply pipe must be made in compliance with the standards in force in the country in which the plant is installed.The dimensions of the pipes and of any pressure reducers must be such as to guarantee the correct operation of theappliances. The materials used must comply with the standards in force in the country in which the plant is installed.7.1 Connecting the applianceThe appliance must be connected to the main pipe with a flexible coupling so as not to hamper oscillation of the appliancedue to expansion.Scaling on thread of nipple (A) must be assured by a specific product, guaranteed by its manufacturer for use with thespecific gas utilized in the installation. The use of white lead paint or minium paint has to be absolutely excluded.3/4 ball valve3/4 stainlesssteel couplingMain pipeAOscillationFig. 42 Connection to the main pipe with a 3/4 flexible stainless steel coupling (minimum length 30 cm)3/4 ball valveFlexible coppertube Ø 16 mmMain pipeOscillationFig. 43 Connection to the main pipe with a 16 mm flexible copper tube41Rev. 18GB0610